Copper-Catalyzed Ring-Opening/Reconstruction of Anthranils with Oxo-Compounds: Synthesis of Quinoline Derivatives

Article abstract of DOI:10.1021/acs.joc.9b01577

A copper-catalyzed protocol for the construction of various 2-aryl(alkyl)-3-acylquinolines or 3-arylquinolines using readily available anthranils and 1,3-diketones or aldehydes as starting materials is reported herein. Dioxygen as the sole oxidant and hexafluoroisopropanol as the solvent play an important role in both procedures. This ring-opening/reconstruction strategy involving N-O bond cleavage and C-N/C-C bond formation features high yields and broad substrate scope.

Full text of DOI:10.1021/acs.joc.9b01577

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Article
Copper-Catalyzed Ring-Opening/Reconstruction of Anthranils
with Oxo-Compounds: Synthesis of Quinoline Derivatives
Liang-Hua Zou, Hao Zhu, Shuai Zhu, Kai Shi, Cheng Yan, and Ping-Gui Li
J. Org. Chem., Just Accepted Manuscript • Publication Date (Web): 04 Sep 2019
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Copper-Catalyzed Ring-Opening/Reconstruction of Anthranils with Oxo-Compounds: Synthesis of
Quinoline Derivatives
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Liang-Hua Zou,* Hao Zhu,§ Shuai Zhu,§ Kai Shi, Cheng Yan, and Ping-Gui Li
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The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Pharmaceutical
Sciences, Jiangnan University, Lihu Avenue 1800, Wuxi 214122, P.R. China
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ABSTRACT: A copper-catalyzed protocol for the construction of various 2-aryl(alkyl)-3-acylquinolines or
3-arylquinolines using readily available anthranils and 1,3-diketones or aldehydes as starting materials is reported
herein. Dioxygen as the sole oxidant and HFIP as the solvent play an important role in both procedures. This
ring-opening/reconstruction strategy involving N–O bond cleavage and C–N/C–C bond formation, features high yields
and broad substrate scope.
INTRODUCTION
Quinolines and their derivatives are frequently found in natural products,1 pharmaceuticals,2 useful ligands3 and materials4 due to
their valuable biological and chemical properties. Traditional protocols for their construction, such as Friedländer synthesis5 and
Doebner-von Miller synthesis,6 could date back to a long time ago. So far, considerable efforts have been devoted to the
development of synthetic strategies for the rapid construction of structurally diverse and complex quinolines through various
transition-metal catalyzed7 and transition-metal-free reactions,8 and so on.9 Among various quinoline derivatives, 2-arylquinoline
scaffolds are associated with a broad range of biological properties, such as antimalarial and antitumor activities.10-13 Recently,
the preparation of 2-aryl-3-acylquinoline derivatives has gained special attention. For example, the Friedländer reaction allows
for the efficient synthesis of these heterocycles in the presence of base, normally at high reaction temperature.5a,14 Besides,
sulfonic acid-functionalized ionic liquids, o-benzenedisulfonimide and Lewis acids were also employed in such
transformations.15 Recently reported methods for the preparation of 2-aryl-3-acylquinolines include: (i) Intermolecular tandem
C–C and C–N bond formation reactions;16 (ii) Modified Friedländer reaction involving SNAr/reduction/annulation cascade;17 (iii)
Enaminone modified Povarov reaction;18 (iv) Double C–H functionalization of quinolines with disubstituted electron-deficient
acetylenes,19 (v) Double C(sp3)-H bond functionalization of saturated ketones,20 and so on.21 Despite these advances, many of
these procedures often suffered from strong acidic conditions,22 highly explosive,17 low yields,18,19 and expensive reagents.20
Therefore, the development of more efficient alternatives are highly desirable.
Recently, anthranil as a bifunctional amination reagent has attracted significant attention23 due to the fact that it is sufficiently
coordinating24 and the N–O bond is polarized and cleavable (Scheme 1, eq a-d).25 In the meanwhile, transition-metal catalyzed
protocols have been developed for the synthesis of quinolines based on the strategy of ring-opening/reconstruction of anthranils
with various unsaturated substrates. For example, Hashmi and Xie et al. reported a gold-catalyzed protocol for the synthesis of
2-aminoquinolines using anthranils and propargyl silyl ethers as starting materials (Scheme 1, eq e).26 Later on, copper21 and
cobalt salts27 proved to be efficient catalysts for the preparation of quinoline derivatives through the reaction of anthranils with
saturated ketones or organozinc pivalates (Scheme 1, eq f and eq g). We reasoned that the N–O bond in anthranils would be
cleaved and subsequently oxo-compounds (including 1,3-diketones or arylacetaldehydes) could insert into the formed
intermediate to generate quinoline derivatives. Herein, we report copper-catalyzed synthesis of 2-aryl(alkyl)-3-acylquinolines
and 3-arylquinolines starting from anthranils and oxo-compounds (Scheme 1, eq h and eq i).
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Scheme 1. Representative examples on the functionalization of anthranils and their application for the synthesis of quinoline derivatives.
RESULTS AND DISCUSSION
The initial optimization of the reaction conditions were conducted with anthranil 1a and 1,3-diketone 2a as substrates (Table
1). Using 1a and 2a at a 1:2 ratio (on a 0.3 mmol scale), Cu(OAc)2 (20 mol %) as catalyst, and DCE as solvent, the desired
product 3a was isolated in 10% yield after stirring at 130 oC for 24 h (Table 1, entry 1). Then various solvents were screened
and HFIP proved to be the best solvent for the reaction with 60% yield of product 3a (Table 1, entries 2-7). Decreasing the
catalyst loading led to a slightly lower yield (Table 1, entry 8). When the reaction was performed using 5 mol % Cu(OAc)2 at
lower temperatures, the yield dropped to 17% and 8%, respectively (Table 1, entry 9). Lower yields were also observed when the
reaction was carried out under argon or air (Table 1, entry 10). The screening of copper salts showed that CuBr2 was the best
catalyst for this transformation (Table 1, entries 11-14). It was shown that the catalyst loading could be decreased to 15 mol %
without any loss of reaction efficiency (Table 1, entry 15). Several nitrogen-containing bidentate ligands were screened for the
reaction and the results revealed that the ligand C proved to be most effective for the reaction, affording the desired product 3a in
82% yield (Table 1, entries 16-21). The yield was increased to 85% when the reaction time was prolonged to 24 h in the absence
of ligand (Table 1, entry 22). However, only trace amounts product 3a was obtained in the absence of catalyst (Table 1, entry
23).
Table 1. Optimization of reaction conditions for the copper-catalyzed synthesis of 2-phenyl-3-benzoylquinoline (3a).a
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Entry
1
Catalyst
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
CuO
Ligand
Solvent
DCE
Yieldb (%)
10
/
2
/
DMF
DMSO
MeCN
toluene
dioxane
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
8
3
/
7
4
/
16
5
/
15
6
/
12
7
/
60
8
/
51c
9
/
17c,d,8c,e
40c,f,33c,g
48
10
11
12
13
14
15
16
17
18
19
20
21
22
23
/
/
CuCl2
/
69
CuBr2
/
72
CuBr
/
/
52
CuBr2
72h,59i
69h
CuBr2
A
B
CuBr2
69h
CuBr2
C
D
E
82h
CuBr2
76h
CuBr2
63h
CuBr2
PPh3
/
56h
CuBr2
85h,j
traceh,j
/
/
aReaction conditions: 1a (0.3 mmol), 2a (0.6 mmol), catalyst (20 mol %), ligand (15 mol %), Cs2CO3 (2.0 equiv), solvent (2 mL), 130 oC,
under dioxygen, 20 h. bAfter column chromatograph. cWith 5 mol % catalyst. d110 oC. e90 oC. fUnder argon. gUnder air. hWith 15 mol %
catalyst. iWith 10 mol % catalyst. j24 h. HFIP: Hexafluoroisopropanol.
With the optimized reaction conditions in hand (Table 1, entry 22), the scope of the reactions of various anthranils 1 with a
variety of 1,3-diketones was investigated (scheme 2). Substrates bearing various electron-donating or electron-withdrawing
substituents at the para-position on the benzene ring were applied to the reaction to synthesize
a series of
2-aryl-3-aroylquinolines. For substrates bearing electron-donating substituents -Me and -OMe, the reaction provided the
corresponding products 3b and 3c in 64% and 65% yields, respectively. It was noteworthy that the yield of 3b was increased to
75% when 15 mol % ligand C was added to the catalytic system. With electron-withdrawing substituents -F, -Cl, and -CF3, the
reaction provided the corresponding products 3d, 3e and 3f in acceptable yields (62%, 55% and 65%, respectively). It was also
noteworthy that the yield of 3e was increased to 61% when 15 mol % ligand C was added to the catalytic system. To further
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investigate the scope of this reaction, unsymmetrical 1,3-diketones containing an aryl group and a methyl group were also
applied. With electron-donating substituents -Me and -OMe or electron-withdrawing -Br and -CF3 at the para-position of
benzene, all the reactions proceeded well, affording products 3g-3j in yields varying from 61% to 88%. Besides, the reaction of
the substrate bearing a naphthyl group with anthranil 1a was successful, yielding product 3k in 52% yield. A substrate containing
a heterocycle could also be employed in the reaction, giving product 3l in 60% yield. Furthermore, 1,3-diketones containing two
alkyl groups were used as substrates, giving products 3m and 3n in 84% and 52% yields, respectively. Importantly, this process
was also effective for the cyclic 1,3-diketones, affording products 3o and 3p in 87% and 75% yields, respectively.
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In order to further explore the scope of the reaction, a series of anthranils 1 bearing various substituents were reacted with
compound 2a (scheme 2). The reactions of various anthranils bearing electron-donating substituent (-OMe) or
electron-withdrawing substituents (-F, -Cl, -Br, -CF3) with compound 2a exhibited good efficiency, producing the desired
products 3q-3w in yields varying from 51% to 85%. Furthermore, electron-donating substrate [1,3]dioxolo[4,5-f]-2,1-
benzisoxazole was also employed in the reaction, providing the desired product 3x in an acceptable yield of 60%. C3-Aryl/alkyl
substituted anthranils were investigated in the reaction, but the corresponding products 3y and 3y’ were not obtained. To our
delight, β-cyano ketone was successfully employed in the reaction, affording product 3z in 53% yield.
Scheme 2. Reaction conditions: 1a (0.3 mmol), 2 (0.6 mmol), CuBr2 (15 mol %), HFIP (2 mL), 130 oC, under dioxygen, 24 h. a15 mol %
ligand C was added.
Inspired by the results on the synthesis of 2-phenyl-3-benzoylquinoline, another oxo-compound arylacetaldehyde 4a was also
introduced to the catalytic system for the transformation of anthranil 1a. The initial optimization of the reaction conditions was
conducted using anthranil 1a and phenylacetaldehyde 4a as substrates (Table 2). Using 1a and 4a at a 1:2 ratio (on a 0.3 mmol
scale), with Cu(OAc)2 (15 mol %) as catalyst, and DCE as solvent, product 5a was obtained in 32% yield when the reaction was
o
stirred for 24 h at 110 C (Table 2, entry 1). No product was obtained when the reaction was performed in the absence of a
copper catalyst (Table 2, entry 2). Silver salts were tried to add to the reaction and the results showed that AgOTf could slightly
promote the reaction efficiency (Table 2, entries 3 and 4). Then various solvents were screened and HFIP was also proved to be
the best solvent for this reaction with 40% yield of product 5a (Table 1, entries 5-10). Subsequently, various copper catalysts
were further screened and the results showed that copper powder was the best catalyst for this transformation (Table 2, entries
11-16). Increasing the loading of catalyst led to a higher yield, affording product 5a in 83% yield (Table 2, entries 17 and 18).
Further investigations showed that a lower reaction temperature (90 oC) was more effective for the reaction, affording product 5a
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in an excellent yield of 90% (Table 1, entries 19 and 20). The yield decreased to 60% when the reaction was performed under
argon (Table 1, entry 21). It was noteworthy that the catalytic efficiency dropped dramatically when AgOTf was omitted in the
reaction, affording product 5a in only 15% yield (Table 2, entry 22).
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Table 2. Optimization of reaction conditions for the copper-catalyzed synthesis of 3-phenylquinoline (5a).a
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Entry
1
Catalyst
Cu(OAc)2
/
Additive
/
Solvent
DCE
Yieldb (%)
32
0
2
/
DCE
3
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
Cu(OAc)2
CuBr2
AgSbF6
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
AgOTf
/
DCE
15
4
DCE
35
5
DMSO
DMF
MeCN
EtOH
HFIP
toluene
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
HFIP
5
6
4
7
trace
27
8
9
40
10
11
12
13
14
15
16
17
18
19
20
21
22
0
5
Cu
77
CuO
13
Cu2O
74
CuCl2H2O
Cu(OTf)2
Cu
3
55
76c
83d
90d,e
17d,f
60d,e,g
15d,e
Cu
Cu
Cu
Cu
Cu
aReaction conditions: 1a (0.3 mmol), 2a (0.6 mmol), catalyst (15 mol %), additive (10 mol %), solvent (2 mL), 110 C, under dioxygen,
o
20 h. bAfter column chromatograph. cWith 10 mol % catalyst. dWith 20 mol % catalyst. e90 oC. f70 oC. gUnder argon.
With the optimized reaction conditions in hand (Table 2, entry 19), the reactions of various anthranils 1 with a series of
arylacetaldehydes 4 was performed under the optimized reaction conditions (scheme 3). At first, substrates bearing various
electron-withdrawing substituents, such as -F, -Cl, -Br, -CF3 and -NO2, reacted well with compound 4a, affording the
corresponding products 5b-5f in yields varying from 35% to 98%. Among these examples, it should be noteworthy that some
minor adjustment on the reaction conditions was required for one substrate bearing -Br substituent possibly due to its relatively
inert reactivity. The yield of product 5d jumped to 66% from 33% when the reaction was performed for 30 h at 110 oC.
Accordingly, under the modified reaction conditions, the reaction of the substrates bearing strong electron-withdrawing
substituents -CF3 and -NO2 afforded products 5e and 5f in 88% and 64% yields, respectively. Similarly, products 5g and 5h were
obtained in excellent yields (91% and 98%, respectively). Under the optimized reaction conditions substrate [1,3]dioxolo[4,5-f]-
2,1-benzisoxazole provided the desired product 5i in 93% yield and this protocol was also successful for one anthranil bearing a
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phenyl substituent at C3 position, affording product 5j in 69% yield. Besides, C3-alkyl substituted anthranil 1b was also tested in
the reaction, providing product 5k in 23% yield under the modified reaction conditions.
In order to further explore the scope of the reaction, a series of aldehydes 4 were introduced to react with compound 1a under
o
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the modified reaction conditions (110 C, 30 h) (scheme 3). The reactions of various acetaldehydes 4b-4d, 4g and 4h bearing
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electron-donating substituents (-Me, -OMe and -tBu) proceeded well, affording products 5l-5n, 5q and 5r in yields varying from
40% to 85%. The substrate 4e bearing electron-withdrawing substituent -Cl could also be employed in the reaction, giving
product 5o in 60% yield, but the reaction of the substrate 4f bearing strong electron-withdrawing substituent -NO2 didn’t afford
product 5p. Besides, alkylacetaldehyde 4i was successfully employed in the reaction, affording the desired product 5s in a low
yield of 25%, but the reaction of hexylacetaldehyde 4j failed to form product 5t. At last, a heterocycle acetaldehyde 4k was also
tested in the reaction, albeit the corresponding product 5u was not formed.
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Scheme 3. Reaction conditions: 1 (0.3 mmol), 2a (0.6 mmol), Cu (20 mol %), AgOTf (10 mol %), HFIP (2 mL), 90 oC, under dioxygen,
20 h. a110 oC, 30 h.
In order to elucidate the mechanism of the two catalytic systems, two control experiments were conducted to investigate
whether 2-aminobenzaldehyde
6 was an intermediate in the process, (Scheme 4, eq a and eq b). The reaction of
2-aminobenzaldehyde 6 with compound 2a afforded the desired product 3a in 75% yield, showing that this reaction could happen
via the intermediate 6. However, the reaction of 2-aminobenzaldehyde 6 with compound 4a did not happen. Furthermore, a
control reaction failed when benzeneacetic acid (7) was used instead of 4a, showing that the reaction did not proceeded via
compound 7 as intermediate (Scheme 4, eq c). Using Cu2O instead of copper powder, product 5a was obtained in a high yield of
86% under argon, indicating that the in situ formed Cu(I) species might be the active catalyst (Scheme 4, eq d), which was
consistent with another evidence that Cu2O exhibits comparable catalytic efficiency in the reaction (entry 12 vs entry 14, Table
2).
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Scheme 4. Control reactions.
Based on these results in hand, two plausible reaction mechanisms are proposed. For the reaction of anthranil 1a with
1,3-diketone 2a, the mechanism was outlined in scheme 5. For the reaction of anthranil 1a with 1,3-diketone 2a the
via oxidative cleavage of N−O
is attacked by intermediate
. It is
is formed
,
mechanism was outlined in scheme 5. Firstly, compound 1a generates intermediate
6
bond using dioxygen as oxidant in the presence of Cu(II) salts. Then intermediate
6
A,
which is formed through the coordination of compound 2a with Cu(II) catalyst, affording intermediate
transformed to intermediate through dehydration in the presence of base. Subsequently, an intermediate
through the attack of nitrogen to carbonyl group and product 3a is obtained through a second dehydration.
B
C
D
Scheme 5. Proposed mechanism for the reaction of anthranil 1a with 1,3-diketone 2a
.
For the reaction of anthranil 1a with arylacetaldehyde 4a, the mechanism is outlined in scheme 6. Firstly, copper powder is
oxidized to Cu(I) species I in the presence of AgOTf and dioxygen,23g,28a which inserts into compound 1a to afford intermediate
II. Then compound 4a coordinates intermediate II to form intermediate III,23g which provides intermediate IV and its isomer
V28b with the release of CuI species. In the process, the formation intermediate III might be a key step due to the fact that
alkylacetaldehydes 4i and 4j demonstrated poor reactivities. It seems that arylacetaldehydes are easier to form stable intermediate
III than alkylacetaldehydes. The subsequent cyclization of intermediate V affords intermediate VI, which is transformed to the
final product 5a through dehydration with the aid of AgOTf.
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Scheme 6. Proposed mechanism for the reaction of anthranil 1a with arylacetaldehyde 4a
.
CONCLUSIONS
In summary, we have developed a straightforward strategy to access various 2-aryl(alkyl)-3-acylquinolines and 3-arylquinolines.
HFIP and dioxygen are essential for both of the procedures. For the reaction of anthranils with 1,3-diketones, this protocol
features high yields and broad substrate scope. As regard to the reaction of anthranils with aryl(alkyl)acetaldehydes, the
combination of copper powder and AgOTf plays an important role in the process. In the process, high yields were also obtained
using a broad scope of readily available substrates.
EXPERIMENTAL SECTION
General Methods and Materials. All solvents were dried over molecular sieves. Unless otherwise noted, materials obtained
from commercial suppliers were used without further purification. 1,3-Diketones including 1,3-diphenylpropane-1,3-dione 2a
and the precursors to product 3m-3p, anthranil precursor to products 3y and 5j, copper powder (99.7% purity, 200 mesh) and
compound 4a are commercially available. Anthranil precursor 1b to products 3p’ and 5k was synthesized to the reported work.23g
Other 1,3-diketone precursors and anthranils 1 were obtained from our previously reported work.29,23g The starting materials
acetaldehydes 4b-4k are synthesized according to the literature.30 The products were isolated by column chromatography on
silica gel (200-300 mesh) by using petroleum ether (30-60 °C) and ethyl acetate as eluents. All yields described herein are the
isolated yields after column chromatography. Reaction progress and product mixtures were routinely monitored by TLC using
TLC SiO2 sheets, and compounds were visualized under ultraviolet light. 1H NMR, 13C NMR and 19F NMR spectra were
1
recorded on a Bruker AVANCE III 400 spectrometer. The spectra were recorded using CDCl3 as a solvent. H NMR chemical
shifts are referenced to tetramethylsilane (TMS, 0 ppm). Abbreviations are as follows: s (singlet), d (doublet), t (triplet), q
(quartet), m (multiplet). High-Resolution Mass Spectra (HRMS) were recorded on Micromass Q-TOF instrument (ESI). Infrared
spectra (IR) spectra were determined on a NICOLET 6700 FT-IR spectrometer. Melting points were measured with a melting
point instrument and were uncorrected.
General procedure for the synthesis of aryl(alkyl)acetaldehydes 4l-t:30
Dess-Martin Periodinane (9.6 mmol, 1.2 eq) was dissolved in 70 mL DCM and alcohol 8 (8 mmol, 1.0 eq) was added dropwise.
The reaction was stirred at room temperature for 18 h and the mixture was quenched with concentrated Na2S2O3(aq), diluted with
DCM, washed with saturated aqueous NaHCO3 and brine. The organic layer was dried over Na2SO4 and concentrated in vacuo.
The residue was purified by column chromatography (SiO2, PE/EtOAc) to provide the corresponding aldehyde 4.
General procedure for the synthesis of 3a starting from anthranil 1a and 1,3-diphenylpropane-1,3-dione 2a: A 25 mL
Schlenk tube equipped with a magnetic stirring bar was charged with a mixture of anthranil 1a (0.3 mmol, 35.7 mg),
1,3-diphenylpropane-1,3-dione 2a (0.6 mmol, 134.4 mg), CuBr2 (15 mol %, 9.9 mg), Cs2CO3 (0.6 mmol, 195.4 mg). Under
reduced pressure, the tube was filled with dioxygen for three times. After the addition of HFIP (2 mL), the reaction was stirred at
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130 oC (heating module) for 24 h. After cooling to rt, the reaction mixture was filtered through celite and concentrated in vacuo.
Purification by column chromatography (silica gel, eluent: petroleum ether/ethyl acetate = 30:1) afforded product 3a (0.25 mmol,
79.2 mg) as a yellow solid in 85% yield.
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Procedure for the scaling-up reaction: To a 150 mL pressure flask was added anthranil 1a (4.0 mmol, 476.5 mg),
1,3-diphenylpropane-1,3-dione 2a (8.0 mmol, 1794.0 mg), CuBr2 (15 mol %, 134.0 mg), Cs2CO3 (8.0 mml, 2606.6 mg). Under
reduced pressure, the pressure flask was filled with dioxygen for three times. Then HFIP (20 mL) was added and the mixture was
stirred at 130 oC (heating metal sand bath) for 24 h. After cooling to rt, the reaction mixture was filtered through celite and
concentrated in vacuo. Purification by column chromatography (silica gel, eluent: petroleum ether/ethyl acetate = 30:1) afforded
product 3a (2.48 mmol, 768.3 mg) as a yellow solid in 65% yield.
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General procedure for the synthesis of 5a starting from anthranil 1a and phenylacetaldehyde 4a: A 25 mL Schlenk tube
equipped with a magnetic stirring bar was charged with a mixture of anthranil 1a (0.3 mmol, 35.7 mg), 2-phenylacetaldehyde 4a
(0.6 mmol, 72.0 mg), Cu (20 mol %, 3.8 mg) and AgOTf (10 mol %, 7.7 mg). Under reduced pressure, the tube was filled with
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dioxygen for three times. After the addition of HFIP (2 mL), the reaction was stirred at 90 C (heating module) for 20 h. After
cooling to rt, the reaction mixture was filtered through celite and concentrated in vacuo. Purification by column chromatography
(silica gel, eluent: petroleum ether/ethyl acetate = 20:1) afforded product 5a (0.27 mmol, 55.7 mg) as a yellow-red oil in 90%
yield.
Procedure for the scaling-up reaction: To a 25 mL pressure sealed tube was added anthranil 1a (2.0 mmol, 238.2 mg),
phenylacetaldehyde 4a (4.0 mmol, 480.6 mg), Cu (20 mol %, 25.4 mg), AgOTf (10 mol %, 51.4 mg). Under reduced pressure,
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the tube was filled with dioxygen for three times. Then HFIP (8 mL) was added and the mixture was stirred at 90 C (heating
module) for 20 h. After cooling to rt, the reaction mixture was filtered through celite and concentrated in vacuo. Purification by
column chromatography (silica gel, eluent: petroleum ether/ethyl acetate = 20:1) afforded product 5a (1.11 mmol, 227.7 mg) as a
yellow-red oil in 55% yield.
Analytical data of the products
3-Methylbenzo[c]isoxazole (1b) (precursor to 3y’ and 5k): PE/EtOAc = 20:1; Yellow oil, 492.1 mg, 61% yield; 1H NMR (400
MHz, CDCl3) δ 7.50 (d, J = 9.1 Hz, 1H), 7.43 (d, J = 8.8 Hz, 1H).7.28-7.24 (m, 1H), 6.93-6.90 (m, 1H), 2.78 (s, 3H); 13C{1H}
NMR (101 MHz, CDCl3) δ 165.7, 157.1, 130.8, 122.8, 119.9, 115.6, 114.9, 12.0; The 1H and 13C NMR spectra data are
consistent with the reported literature.31
p-Tolylacetaldehyde (4b) (Precursor to product 5l): PE/EtOAc = 80:1; Light yellow oil, 597.0 mg, 56% yield; 1H NMR (400
MHz, CDCl3) δ 9.72 (t, J = 2.4 Hz, 1H), 7.18 (d, J = 7.9 Hz, 2H), 7.11 (d, J = 8.0 Hz, 2H), 3.65 (d, J = 2.4 Hz, 2H), 2.35 (s, 3H);
The 1H NMR spectra data are consistent with the reported literature.32
p-Methoxyphenylacetaldehyde (4c) (Precursor to product 5m): PE/EtOAc = 20:1; Light yellow oil, 663.3 mg, 55% yield; 1H
NMR (400 MHz, CDCl3) δ 9.72 (t, J = 2.4 Hz, 1H), 7.15-7.13 (m, 2H), 6.92-6.90 (m, 2H), 3.81 (s, 3H), 3.64 (d, J = 2.4 Hz, 2H);
The 1H NMR spectra data are consistent with the reported literature.33
p-(tert-Butylphenyl)acetaldehyde (4d) (Precursor to product 5n): PE/EtOAc = 50:1; Light yellow oil, 550.5 mg, 56% yield;
1H NMR (400 MHz, CDCl3) δ 9.75 (t, J = 2.3 Hz, 1H), 7.40 (d, J = 8.1 Hz, 2H), 7.16 (d, J = 8.1 Hz, 2H), 3.66 (d, J = 2.2 Hz,
2H), 1.32 (s, 9H); The 1H NMR spectra data are consistent with the reported literature.34
p-Chlorophenylacetaldehyde (4e) (Precursor to product 5o): PE/EtOAc = 20:1; Yellow solid, 630.3 mg, 51% yield; 1H NMR
(400 MHz, CDCl3) δ 9.75 (t, J = 2.1 Hz, 1H), 7.36-7.33 (m, 2H), 7.15 (d, J = 8.4 Hz, 2H), 3.69 (d, J = 2.1 Hz, 2H); The 1H NMR
spectra data are consistent with the reported literature.35
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p-Nitrophenylacetaldehyde (4f) (Precursor to product 5p): PE/EtOAc = 5:1; Red solid, 577.4 mg, 44% yield; H NMR (400
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MHz, CDCl3) δ 9.83 (t, J = 1.7 Hz, 1H), 8.24 (d, J = 8.7 Hz, 2H), 7.40 (d, J = 8.7 Hz, 2H), 3.89 (d, J = 1.5 Hz, 2H); The H
NMR spectra data are consistent with the reported literature.36
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o-Tolylacetaldehyde (4g) (Precursor to product 5q): PE/EtOAc = 50:1; Light yellow oil, 538.3 mg, 50% yield; 1H NMR (400
MHz, CDCl3) δ 9.71 (t, J = 2.3 Hz, 1H), 7.23-7.17 (m, 4H), 3.71 (d, J = 2.2 Hz, 2H), 2.28 (s, 3H); The 1H NMR spectra data are
consistent with the reported literature.35
m-Tolylacetaldehyde (4h) (Precursor to product 5r): PE/EtOAc = 50:1; Light yellow oil, 536.2 mg, 50% yield; 1H NMR (400
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MHz, CDCl3) δ 9.73 (t, J = 2.4 Hz, 1H), 7.12 (d, J = 7.6 Hz, 2H), 7.03 (s, 2H), 3.65 (d, J = 2.4 Hz, 2H), 2.36 (s, 3H); The H
NMR spectra data are consistent with the reported literature.37
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Cyclohexylacetaldehyde (4i) (Precursor to product 5s): PE/EtOAc = 50:1; Colorless oil, 530.1 mg, 42% yield; 1H NMR (400
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MHz, CDCl3) δ 9.76 (t, J = 2.3 Hz, 1H), 2.30 (dd, J = 6.8, 2.3 Hz, 2H), 2.23 (d, J = 6.7 Hz, 1H), 1.73-1.69 (m, 10H); The H
NMR spectra data are consistent with the reported literature.38
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Octanal (4j) (Precursor to product 5t): PE/EtOAc = 30:1; Colorless oil, 422.3 mg, 41% yield; H NMR (400 MHz, CDCl3) δ
9.77 (t, J = 1.8 Hz, 1H), 2.43 (td, J = 7.4, 1.8 Hz, 2H), 2.35 (t, J = 7.5 Hz, 1H), 1.30-1.28 (m, 12H); The 1H NMR spectra data are
consistent with the reported literature.39
2-(Thiophen-3-yl)acetaldehyde (4k) (Precursor to product 5u): PE/EtOAc = 30:1; Light yellow oil, 246.0 mg, 24% yield; 1H
NMR (400 MHz, CDCl3) δ 9.74 (t, J = 2.3 Hz, 1H), 7.36 (dd, J = 4.9, 3.0 Hz, 1H), 7.15-7.14 (m, 1H), 6.98 (dd, J = 4.9, 1.2 Hz,
1H), 3.73 (d, J = 2.2 Hz, 2H); 13C{1H} NMR (101 MHz, CDCl3) δ 198.8, 131.6, 128.5, 126.5, 123.5, 44.9; The 1H NMR spectra
data are consistent with the reported literature.40
2-Phenyl-3-benzoylquinoline (3a)
Compound 3a was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 30:1) afforded 3a (79.2 mg, 85%) as a yellow solid; m.p. 124.5-125.4 oC (135-137 oC)17; 1H NMR (400 MHz, CDCl3) δ
8.34 (s, 1H), 8.25 (d, J = 8.5 Hz, 1H), 7.90 (d, J = 8.0 Hz, 1H), 7.85-7.81 (m, 1H), 7.72 (dd, J = 8.2, 1.0 Hz, 2H), 7.61 (td, J = 8.0,
1.2 Hz, 3H), 7.47 (t, J = 7.4 Hz, 1H), 7.35-7.27 (m, 5H); 13C{1H} NMR (101 MHz, CDCl3) δ 197.0, 157.5, 148.4, 139.7, 137.7,
137.0, 133.4, 132.8, 131.3, 130.0, 129.7, 129.3, 128.9, 128.5, 128.4, 128.2, 127.4, 125.8; ATR-FTIR (cm-1): 3392, 2919, 2849,
2359, 1655, 1590, 1554, 1484, 1449, 1414, 1272, 1233, 1080, 1017, 908, 874, 772, 690; HRMS (ESI-TOF) m/z: [M+H]+ calcd
for C22H16NO 310.1226; found 310.1226; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.41
2-p-Tolyl-3-(p-methyl)benzoylquinoline (3b)
Compound 3b was synthesized in accordance with the typical procedure (15 mol % ligand C was added). Purification by column
chromatography on silica gel (PE:EA = 30:1) afforded 3b (75.8 mg, 75%) as a light yellow solid; m.p. 154.0-155.2 oC; 1H NMR
(400 MHz, CDCl3) δ 8.25 (s, 1H), 8.23 (d, J = 8.5 Hz, 1H), 7.86 (d, J = 8.6 Hz, 1H), 7.83-7.79 (m, 1H), 7.67 (d, J = 8.2 Hz, 2H),
7.60-7.56 (m, 1H), 7.54 (d, J = 8.1 Hz, 2H), 7.16 (d, J = 8.1 Hz, 2H), 7.11 (d, J = 8.0 Hz, 2H), 2.37 (s, 3H), 2.29 (s, 3H); 13C{1H}
NMR (101 MHz, CDCl3) δ 196.7, 157.5, 148.3, 144.5, 138.8, 137.2, 136.9, 134.5, 133.0, 131.0, 130.3, 129.6, 129.2, 129.2,
129.2, 128.0, 127.1, 125.7, 21.8, 21.3; ATR-FTIR (cm-1): 2928, 1626, 1531, 1455, 1361, 1265, 1232, 1039, 992, 909, 837, 735;
HRMS (ESI-TOF) m/z: [M+H]+ calcd for C24H20NO 338.1539; found 338.1536.
2-p-Methoxyphenyl-3-(p-methoxy)benzoylquinoline (3c)
Compound 3c was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 10:1) afforded 3c (72.0 mg, 65%) as a yellow solid; m.p. 134.0-135.5 oC; 1H NMR (400 MHz, CDCl3) δ 8.25 (s, 1H),
8.21 (d, J = 8.5 Hz, 1H), 7.86 (d, J = 8.1 Hz, 1H), 7.80 (t, J = 7.6 Hz, 1H), 7.73 (d, J = 8.8 Hz, 2H), 7.62 (d, J = 8.7 Hz, 2H), 7.58
(t, J = 7.6 Hz, 1H), 6.83 (dd, J = 8.7, 3.7 Hz, 4H), 3.83 (s, 3H), 3.77 (s, 3H); 13C{1H} NMR (101 MHz, CDCl3) δ 195.8, 163.8,
160.2, 156.8, 148.3, 137.1, 133.0, 132.5, 132.3, 130.9, 130.7, 130.0, 129.5, 128.0, 127.0, 125.6, 113.9, 113.8, 55.5, 55.3;
ATR-FTIR (cm-1): 2924, 1736, 1635, 1495, 1460, 1377, 1266, 1122, 1084, 1017, 938, 742, 703; HRMS (ESI-TOF) m/z: [M+H]+
calcd for C24H20NO3 370.1437; found 370.1436; The 1H NMR and 13C NMR spectra data are consistent with the reported
literature.7a
2-(p-Fluoro)phenyl-3-(p-fluoro)benzoylquinoline (3d)
Compound 3d was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
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(PE:EA = 20:1) afforded 3d (64.2 mg, 62%) as a white solid; m.p. 160.2-161.5 C; H NMR (400 MHz, CDCl3) δ 8.34 (s, 1H),
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8.23 (d, J = 8.5 Hz, 1H), 7.92-7.90 (m, 1H), 7.87-7.83 (m, 1H), 7.74-7.71 (m, 2H), 7.65-7.59 (m, 3H), 7.03-6.97 (m, 4H); 13C{1H}
NMR (101 MHz, CDCl3) δ 195.4, 167.1, 164.5 (d, JF-C = 8.3 Hz), 162.0, 156.0, 148.4, 137.8, 135.8 (d, JF-C = 3.3 Hz), 133.3 (d,
JF-C = 2.9 Hz), 132.6 (d, JF-C = 9.5 Hz), 132.4, 131.5, 131.1 (d, JF-C = 8.5 Hz), 129.6, 127.9 (d, JF-C = 61.8 Hz), 125.8, 115.7 (d,
JF-C = 41.7 Hz), 115.6 (d, JF-C = 2.1 Hz); 19F NMR (376 MHz, CDCl3) δ -103.64, -112.17; HRMS (ESI-TOF) m/z: [M+H]+ calcd
for C22H14F2NO 346.1038; found 346.1034.
2-(p-Chloro)phenyl-3-(p-chloro)benzoylquinoline (3e)
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Compound 3e was synthesized in accordance with the typical procedure (15 mol % ligand C was added). Purification by column
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chromatography on silica gel (PE:EA = 30:1) afforded 3e (69.0 mg, 61%) as a white solid; m.p. 162.5-163.6 C (174-178 oC)42;
1H NMR (400 MHz, CDCl3) δ 8.33 (s, 1H), 8.23 (d, J = 8.5 Hz, 1H), 7.92 (d, J = 8.2 Hz, 1H), 7.89-7.84 (m, 1H), 7.68-7.63 (m,
3H), 7.58-7.54 (m, 2H), 7.35-7.29 (m, 4H); 13C{1H} NMR (101 MHz, CDCl3) δ 195.6, 155.9, 148.4, 140.2, 138.0, 137.8, 135.4,
135.2, 132.1, 131.6, 131.3, 130.5, 129.7, 129.0, 128.8, 128.2, 127.7, 125.8; HRMS (ESI-TOF) m/z: [M+H]+calcd for
C22H14Cl2NO 378.0447; found 378.0446; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.42
2-(p-Trifluoromethyl)phenyl-3-(p-trifluoromethyl)benzoylquinoline (3f)
Compound 3f was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
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(PE:EA = 30:1) afforded 3f (86.8 mg, 65%) as a white solid; m.p. 151.1-152.2 C; H NMR (400 MHz, CDCl3) δ 8.41 (s, 1H),
8.27-8.25 (m, 1H), 7.95 (d, J = 8.2 Hz, 1H), 7.93-7.88 (m, 1H), 7.84 (d, J = 8.1 Hz, 2H), 7.72-7.67 (m, 3H), 7.63 (d, J = 8.2 Hz,
2H), 7.57 (d, J = 8.1 Hz, 2H); 13C{1H} NMR (101 MHz, CDCl3) δ 195.4, 156.0, 148.5, 143.0, 139.6, 138.4, 134.8 (q, JF-C = 32.9
Hz), 132.0, 131.7, 130.9 (q, JF-C = 32.9 Hz), 130.2, 129.8, 129.6, 128.3, 128.1, 127.6, 125.7 (q, JF-C = 3.7 Hz), 125.5 (q, JF-C = 3.8
Hz), 123.9 (q, JF-C = 272.5 Hz), 123.4 (q, JF-C = 272.9 Hz); 19F NMR (376 MHz, CDCl3) δ -62.87, -63.29; HRMS (ESI-TOF) m/z:
[M+H]+ calcd for C24H14F6NO 446.0974; found 446.0965.
2-(Methyl)-3-(p-methyl)benzoylquinoline (3g)
Compound 3g was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
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(PE:EA = 10:1) afforded 3g (65.0 mg, 83%) as a yellow solid; m.p. 82.3-83.7 C; H NMR (400 MHz, CDCl3) δ 8.11-8.08 (m,
2H), 7.81-7.78 (m, 2H), 7.75 (dd, J = 8.4, 1.6 Hz, 2H), 7.57-7.53 (m, 1H), 7.30 (d, J = 7.9 Hz, 2H), 2.73 (s, 3H), 2.45 (s, 3H);
13C{1H} NMR (101 MHz, CDCl3) δ 196.5, 156.6, 148.0, 144.9, 136.5, 134.7, 132.6, 131.0, 130.4, 129.5, 128.7, 128.1, 126.7,
125.4, 24.2, 21.8; ATR-FTIR (cm-1): 2921, 1604, 1417, 1375, 1278, 1262, 1243, 120, 1178, 1147, 785, 751; HRMS (ESI-TOF)
m/z: [M+H]+ calcd for C18H16NO 262.1226; found 262.1226.
2-(Methyl)-3-(p-methoxy)benzoylquinoline (3h)
Compound 3h was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 10:1) afforded 3h (53.2 mg, 54%) as a yellow oil; 1H NMR (400 MHz, CDCl3) δ 8.09 (t, J = 3.9 Hz, 2H), 7.85-7.75 (m,
4H), 7.57-7.53 (m, 1H), 6.98-6.95 (m, 2H), 3.89 (s, 3H), 2.72 (s, 3H); 13C{1H} NMR (101 MHz, CDCl3) δ 195.4, 164.2, 156.5,
147.9, 136.0, 132.8, 132.6, 130.8, 130.1, 128.6, 128.0, 126.6, 125.4, 114.0, 55.6, 24.1; ATR-FTIR (cm-1): 2839, 1651, 1594, 1421,
1315, 1253, 1167, 1025, 912, 882, 846, 786, 752, 580; HRMS (ESI-TOF) m/z: [M+H]+ calcd for C18H16NO2 278.1175; found
278.1177.
2-(Methyl)-3-(p-bromo)benzoylquinoline (3i)
Compound 3i was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 20:1) afforded 3i (85.8 mg, 88%) as a yellow-red solid; m.p. 100.2-101.1 oC; 1H NMR (400 MHz, CDCl3) δ 8.09 (d, J
= 11.7 Hz, 2H), 7.79 (dd, J = 7.8, 6.3 Hz, 2H), 7.71 (d, J = 8.6 Hz, 2H), 7.64 (d, J = 8.6 Hz, 2H), 7.56 (t, J = 7.5 Hz, 1H), 2.74 (s,
3H); 13C{1H} NMR (101 MHz, CDCl3) δ 195.7, 156.6, 148.1, 136.9, 136.0, 132.1, 131.6, 131.6, 131.3, 129.1, 128.7, 128.1,
126.8, 125.2, 24.3; ATR-FTIR (cm-1): 1721, 1659, 1615, 1582, 1488, 1416, 1268, 1174, 1068, 1009, 913, 879, 790, 758, 656;
HRMS (ESI-TOF) m/z: [M+H]+ calcd for C17H13BrNO 326.0175; found 326.0178.
2-(Methyl)-3-(p-trifluoromethyl)benzoylquinoline (3j)
Compound 3j was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 20:1) afforded 3j (57.7 mg, 61%) as a yellow solid; m.p. 119.8-120.6 oC ; 1H NMR (400 MHz, CDCl3) δ 8.14 (s, 1H),
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(101 MHz, CDCl3) δ 195.7, 156.7, 148.3, 140.2, 137.5, 134.9 (q, JF-C = 32.7 Hz), 131.6, 131.2, 130.4, 128.8, 128.2, 127.0, 125.8
(q, JF-C = 3.7 Hz), 125.1, 123.5 (q, JF-C = 272.8 Hz), 24.4; 19F NMR (376 MHz, CDCl3) δ -63.09; ATR-FTIR (cm-1): 2923, 1665,
1617, 1488, 1411, 1325, 1019, 913, 863, 753; HRMS (ESI-TOF) m/z: [M+H]+ calcd for C18H13F3NO 316.0943; found 316.0946.
2-(Methyl)-3-(naphthalen)formylquinoline (3k)
Compound 3k was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
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(PE:EA = 20:1) afforded 3k (46.8 mg, 52%) as a yellow oil; H NMR (400 MHz, CDCl3) δ 8.61 (dd, J = 8.2, 1.0 Hz, 1H), 8.16
(s, 1H), 8.08 (t, J = 9.0 Hz, 2H), 7.97-7.95 (m, 1H), 7.81-7.77 (m, 1H), 7.72 (d, J = 8.1 Hz, 1H), 7.65-7.58 (m, 3H), 7.54-7.45 (m,
2H), 2.87 (s, 3H); 13C{1H} NMR (101 MHz, CDCl3) δ 198.6, 157.6, 148.3, 138.8, 135.6, 134.0, 133.5, 133.4, 131.5, 131.1,
130.8, 128.7, 128.6, 128.4, 128.3, 126.9, 126.7, 125.7, 125.5, 124.4, 24.8; ATR-FTIR (cm-1): 2922, 1655, 1616, 1591, 1562,
1417, 1281, 1237, 1187, 1116, 909, 887, 768, 755, 597; HRMS (ESI-TOF) m/z: [M+H]+ calcd for C21H16NO 298.1226; found
298.1228.
2-(Methyl)-3-(thiophen)formylquinoline (3l)
Compound 3l was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
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(PE:EA = 10:1) afforded 3l (45.6 mg, 60%) as a yellow solid; m.p. 56.3-57.9 C; H NMR (400 MHz, CDCl3) δ 8.25 (s, 1H),
8.09 (d, J = 8.4 Hz, 1H), 7.84-7.77 (m, 3H), 7.59-7.55 (m, 1H), 7.48 (dd, J = 3.8, 1.2 Hz, 1H), 7.17 (dd, J = 4.9, 3.8 Hz, 1H),
2.80 (s, 3H); 13C{1H} NMR (101 MHz, CDCl3) δ 188.6, 156.5, 148.1, 144.5, 136.2, 135.8, 135.8, 132.0, 131.2, 128.7, 128.5,
128.1, 126.8, 125.2, 24.0; ATR-FTIR (cm-1): 3082, 1637, 156, 1514, 1419, 1407, 1352, 1258, 1052, 868, 831, 740; HRMS
(ESI-TOF) m/z: [M+H]+ calcd for C15H12NOS 254.0634; found 254.0635.
2-(Methyl)-3-(ethanone)quinoline (3m)
Compound 3m was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 10:1) afforded 3m (46.5 mg, 84%) as a white solid; m.p. 55.4-56.1 oC (74.0-75.0 oC)17; 1H NMR (400 MHz, CDCl3) δ
8.48 (s, 1H), 8.04 (d, J = 8.5 Hz, 1H), 7.86 (d, J = 8.1 Hz, 1H), 7.81-7.77 (m, 1H), 7.58-7.54 (m, 1H), 2.92 (s, 3H), 2.72 (s, 3H);
13C{1H} NMR (101 MHz, CDCl3) δ 200.0, 157.6, 148.3, 138.3, 131.8, 131.1, 128.6, 128.4, 126.7, 125.6, 29.3,25.7; ATR-FTIR
(cm-1): 2920, 1677, 1619, 1562, 1487, 1418, 1352, 1197, 1031, 946, 926, 862, 780, 655, 584; The 1H NMR and 13C NMR spectra
data are consistent with the reported literature.43
Methyl-2-methylquinoline-3-carboxylate (3n)
Compound 3n was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 20:1) afforded 3n (31.4 mg, 52%) as a white solid; m.p. 65.6-66.9 oC (61.0-63.0 oC)16; 1H NMR (400 MHz, CDCl3) δ
8.75 (s, 1H), 8.04 (d, J = 8.5 Hz, 1H), 7.86 (d, J = 8.1 Hz, 1H), 7.81-7.77 (m, 1H), 7.57-7.53 (m, 1H), 3.98 (s, 3H), 3.00 (s, 3H);
13C{1H} NMR (101 MHz, CDCl3) δ 167.0, 158.5, 148.7, 140.1, 131.8, 128.5, 128.5, 126.6, 125.7, 123.5, 52.4, 25.7; ATR-FTIR
(cm-1): 3257, 1620, 1568, 1492, 1439, 1421, 1282, 1253, 1204, 1133, 1066, 788, 751; The H NMR and 13C NMR spectra data
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3,4-Dihydroacridin-1(2H)-one (3o)
Compound 3o was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 5:1) afforded 3o (51.5 mg, 87%) as a light yellow solid; m.p. 95.5-96.8 C (109.0-111.0 C)44; H NMR (400 MHz,
CDCl3) δ 8.86 (s, 1H), 8.05 (d, J = 8.5 Hz, 1H), 7.94 (d, J = 8.2 Hz, 1H), 7.82 (dd, J = 8.4, 7.0 Hz, 1H), 7.56 (t, J = 7.5 Hz, 1H),
3.33 (t, J = 6.1 Hz, 2H), 2.81 (t, J = 6.5 Hz, 2H), 2.30 (dd, J = 12.7, 5.8 Hz, 2H); 13C{1H} NMR (101 MHz, CDCl3) δ 198.0,
162.0, 150.0, 137.2, 132.4, 129.8, 128.6, 126.8, 126.7, 126.3, 39.1, 33.5, 21.8; ATR-FTIR (cm-1): 2921, 1678, 1616, 1592, 1493,
1463, 1411, 1205, 1171, 1128, 791, 766; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.7a
11H-Indeno[1,2-b]quinolin-11-one (3p)
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Compound 3p was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 20:1) afforded 3p (52.0 mg, 75%) as a light yellow solid; m.p. 172.9-173.5 oC (172.0-174.0 oC)45; 1H NMR (400 MHz,
CDCl3) δ 8.36 (s, 1H), 8.09 (t, J = 8.5 Hz, 2H), 7.84 (dd, J = 16.0, 7.8 Hz, 2H), 7.78-7.74 (m, 1H), 7.68 (td, J = 7.5, 1.0 Hz, 1H),
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7.55-7.50 (m, 2H); 13C{1H} NMR (101 MHz, CDCl3) δ 191.0, 162.1, 150.6, 143.9, 137.5, 135.6, 132.6, 132.1, 131.6, 130.6,
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129.9, 127.7, 127.3, 127.1, 124.2, 121.9; ATR-FTIR (cm-1): 3049, 1715, 1621, 1513, 1406, 1178, 925, 865, 774, 731; The H
NMR and 13C NMR spectra data are consistent with the reported literature.45
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6-(Methoxy)-2-phenyl-3-benzoylquinoline (3q)
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Compound 3q was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 20:1) afforded 3q (66.1 mg, 65%) as a white solid; m.p. 144.6-145.2 oC (157.0-159.0 oC)19; 1H NMR (400 MHz,
CDCl3) δ 8.22 (s, 1H), 8.14 (d, J = 9.2 Hz, 1H), 7.72-7.70 (m, 2H), 7.60-7.58 (m, 2H), 7.50-7.44 (m, 2H), 7.34-7.23 (m, 5H),
7.14 (d, J = 2.8 Hz, 1H), 3.94 (s, 3H); 13C{1H} NMR (101 MHz, CDCl3) δ 197.3, 158.4, 155.0, 144.6, 139.8, 137.1, 136.3, 133.3,
133.0, 131.1, 130.0, 129.2, 128.6, 128.4, 126.9, 124.2, 105.2, 55.7; ATR-FTIR (cm-1): 3059, 2924, 2850, 1657, 1593, 1488, 1448,
1375, 1270, 1223, 1168, 1027, 889, 830, 688; The 1H NMR and 13C NMR spectra data are consistent with the reported
literature.19
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6-(Fluoro)-2-phenyl-3-benzoylquinoline (3r)
Compound 3r was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 30:1) afforded 3r (50.0 mg, 51%) as a light yellow solid; m.p. 122.6-123.8 oC; 1H NMR (400 MHz, CDCl3) δ 8.28 (s,
1H), 8.25 (dd, J = 9.3, 5.3 Hz, 1H), 7.72-7.70 (m, 2H), 7.63-7.58 (m, 3H), 7.53-7.46 (m, 2H), 7.36-7.26 (m, 5H); 13C{1H} NMR
(101 MHz, CDCl3) δ 196.7, 162.1, 159.6, 156.8, 156.8, 145.5, 139.4, 136.8 (d, JF-C = 6.7 Hz), 133.6, 133.5, 132.2 (d, JF-C = 9.1
Hz), 130.0, 129.2, 129.0, 128.5, 126.5 (d, JF-C = 10.2 Hz), 121.5 (d, JF-C = 25.8 Hz), 111.1 (d, JF-C = 21.9 Hz); 19F NMR (376
MHz, CDCl3) δ -111.81; ATR-FTIR (cm-1): 2920, 1656, 1595, 1488, 1271, 1214, 1014, 931, 892, 829, 727, 689, 616, 586;
HRMS (ESI-TOF) m/z: [M+H]+ calcd for C22H15FNO 328.1132; found 328.1136.
6-(Chloro)-2-phenyl-3-benzoylquinoline (3s)
Compound 3s was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 20:1) afforded 3s (87.6 mg, 85%) as a white solid; m.p. 154.3-155.6 oC (161.0-163.0 oC)19; 1H NMR (400 MHz,
CDCl3) δ 8.23 (s, 1H), 8.17 (d, J = 9.0 Hz, 1H), 7.87 (d, J = 2.3 Hz, 1H), 7.77-7.69 (m, 3H), 7.62-7.60 (m, 2H), 7.48 (t, J = 7.4
Hz, 1H), 7.35-7.26 (m, 5H); 13C{1H} NMR (101 MHz, CDCl3) δ 196.6, 157.7, 146.7, 139.3, 136.7, 136.67, 133.7, 133.6, 133.1,
132.1, 131.3, 130.0, 129.2, 129.1, 128.5, 126.7, 126.4; ATR-FTIR (cm-1): 3051, 2162, 1666, 1656, 1588, 1551, 1474, 1447, 1270,
1231, 1072, 1014, 885, 829, 794, 760, 692, 607; The 1H NMR and 13C NMR spectra data are consistent with the reported
literature.19
7-(Fluoro)-2-phenyl-3-benzoylquinoline (3t)
Compound 3t was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 50:1) afforded 3t (54.0 mg, 55%) as a yellow oil; 1H NMR (400 MHz, CDCl3) δ 8.34 (s, 1H), 7.93-7.86 (m, 2H), 7.71
(dd, J = 8.2, 1.1 Hz, 2H), 7.62-7.60 (m, 2H), 7.50-7.46 (m, 1H), 7.41 (td, J = 8.6, 2.5 Hz, 1H), 7.35-7.27 (m, 5H); 13C{1H} NMR
(101 MHz, CDCl3) δ 196.8, 165.5, 163.0, 158.6, 149.5 (d, JF-C = 13.1 Hz), 139.4, 137.6, 136.9, 133.5, 132.2 (d, JF-C = 2.7 Hz),
130.3 (d, JF-C = 10.3 Hz), 130.0, 129.3, 129.1, 128.5 (d, JF-C = 3.2 Hz), 122.9, 118.0 (d, JF-C = 25.6 Hz), 113.4 (d, JF-C = 20.5 Hz);
19F NMR (376 MHz, CDCl3) δ -106.44; ATR-FTIR (cm-1): 3344, 3060, 2360, 1663, 1623, 1562, 1486, 1449, 1282, 1201, 1122,
1015, 898, 690, 623; HRMS (ESI-TOF) m/z: [M+H]+ calcd for C22H15FNO 328.1132; found 328.1133.
7-(Chloro)-2-phenyl-3-benzoylquinoline (3u)
Compound 3u was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
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(PE:EA = 50:1) afforded 3u (66.9 mg, 65%) as a white solid; m.p. 119.9-120.7 C; H NMR (400 MHz, CDCl3) δ 8.32 (s, 1H),
8.25 (d, J = 2.0 Hz, 1H), 7.85 (d, J = 8.7 Hz, 1H), 7.72-7.69 (m, 2H), 7.62-7.56 (m, 3H), 7.51-7.46 (m, 1H), 7.36-7.28 (m, 5H);
13C{1H} NMR (101 MHz, CDCl3) δ 196.7, 158.5, 148.7, 139.3, 137.4, 137.2, 136.8, 133.5, 133.0, 130.0, 129.3, 129.3, 129.2,
128.70, 128.5, 128.5, 128.4, 124.2; ATR-FTIR (cm-1): 3062, 2920, 2849, 1655, 1597, 1475, 1410, 1284, 1229, 1146, 1064, 1015,
930, 867, 812, 761, 691; HRMS (ESI-TOF) m/z: [M+H]+ calcd for C22H15ClNO 344.0836; found 344.0836.
7-(Bromo)-2-phenyl-3-benzoylquinoline (3v)
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Compound 3v was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
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(PE:EA = 20:1) afforded 3v (97.5 mg, 84%) as a white solid; m.p. 62.4-63.5 C; H NMR (400 MHz, CDCl3) δ 8.43 (d, J = 1.5
Hz, 1H), 8.30 (s, 1H), 7.75 (d, J = 8.7 Hz, 1H), 7.69 (td, J = 6.9, 3.4 Hz, 3H), 7.62-7.59 (m, 2H), 7.47 (t, J = 7.4 Hz, 1H),
7.35-7.27 (m, 5H); 13C{1H} NMR (101 MHz, CDCl3) δ 196.6, 158.4, 148.8, 139.3, 137.5, 136.8, 133.5, 133.1, 132.0, 130.9,
130.0, 129.3, 129.3, 129.2, 128.5, 125.6, 124.4; ATR-FTIR (cm-1): 3435, 3324, 1655, 1597, 1537, 1472, 1397, 1337, 1284, 1194,
1145, 1078, 1014, 905, 888, 787, 761; HRMS (ESI-TOF) m/z: [M+H]+ calcd for C22H15BrNO 388.0331; found 388.0331.
7-(Trifluoromethyl)-2-phenyl-3-benzoylquinoline (3w)
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Compound 3w was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
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(PE:EA = 40:1) afforded 3w (79.2 mg, 70%) as a white solid; m.p. 163.1-164.3 C; H NMR (400 MHz, CDCl3) δ 8.57 (d, J =
0.7 Hz, 1H), 8.39 (s, 1H), 8.04 (d, J = 8.5 Hz, 1H), 7.79 (dd, J = 8.5, 1.6 Hz, 1H), 7.72-7.70 (m, 2H), 7.64 (dt, J = 5.3, 2.0 Hz,
2H), 7.52-7.48 (m, 1H), 7.37-7.29 (m, 5H); 13C{1H} NMR (101 MHz, CDCl3) δ 196.4, 158.8, 147.3, 139.0, 137.2, 136.6, 134.7,
133.7, 132.8 (q, JF-C = 32.8 Hz), 130.0, 129.4, 129.3, 129.3, 128.6, 127.5 (q, JF-C = 4.4 Hz), 127.3, 123.8 (d, JF-C = 272.8 Hz),
122.9 (q, JF-C = 3.2 Hz); 19F NMR (376 MHz, CDCl3) δ -62.82; ATR-FTIR (cm-1): 3063, 2921, 1656, 1595, 1454, 1419, 1351,
1315, 1283, 1192, 1125, 1057, 1015, 922, 893, 816, 720, 692; HRMS (ESI-TOF) m/z: [M+H]+ calcd for C23H15F3NO 378.1100;
found 378.1100.
Phenyl(6-phenyl-[1,3]dioxolo[4,5-g]quinolin-7-yl)methanone (3x)
Compound 3x was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
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(PE:EA = 10:1) afforded 3x (63.6 mg, 60%) as a yellow oil; H NMR (400 MHz, CDCl3) δ 8.14 (s, 1H), 7.71-7.68 (m, 2H),
7.58-7.56 (m, 2H), 7.51 (s, 1H), 7.47-7.43 (m, 1H), 7.33-7.23 (m, 5H), 7.12 (s, 1H), 6.16 (s, 2H); 13C{1H} NMR (101 MHz,
CDCl3) δ 197.3, 155.6, 152.2, 148.5, 147.1, 139.8, 137.2, 136.4, 133.2, 131.0, 130.0, 129.2, 128.6, 128.4, 128.3, 122.9, 106.1,
102.9, 102.1; ATR-FTIR (cm-1): 3058, 2916, 1662, 1474, 1455, 1427, 1396, 1365, 1267, 1227, 1182, 1035, 895, 827, 759, 727,
696; HRMS (ESI-TOF) m/z: [M+H]+ calcd for C23H16NO3 354.1124; found 354.1125.
2-Phenyl-3-nitrilequinoline (3z)
Compound 3z was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 10:1) afforded 3z (36.8 mg, 53%) as a white solid; m.p. 193.2-194.6 oC (193.0-195.0 oC)19; 1H NMR (400 MHz, CDCl3)
δ 8.67 (s, 1H), 8.21 (d, J = 8.4 Hz, 1H), 8.01-7.99 (m, 2H), 7.90 (t, J = 8.0 Hz, 2H), 7.67 (t, J = 7.5 Hz, 1H), 7.60-7.54 (m, 3H);
13C{1H} NMR (101 MHz, CDCl3) δ 158.1, 148.7, 144.3, 137.7, 133.1, 130.1, 130.0, 129.2, 128.8, 128.1, 127.8, 125.0, 118.0,
105.6; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.19
3-Phenylquinoline (5a)
Compound 5a was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 20:1) afforded 5a (55.7 mg, 90%) as a red oil; 1H NMR (400 MHz, CDCl3) δ 9.19 (d, J = 2.2 Hz, 1H), 8.30 (d, J = 2.0
Hz, 1H), 8.15 (d, J = 8.4 Hz, 1H), 7.88 (d, J = 8.1 Hz, 1H), 7.73 (dd, J = 10.7, 4.3 Hz, 3H), 7.55 (dt, J = 15.1, 7.8 Hz, 3H), 7.44
(t, J = 7.4 Hz, 1H); 13C{1H} NMR (101 MHz, CDCl3) δ 150.0, 147.3, 137.9, 133.9, 133.3, 129.5, 129.2, 128.2, 128.1, 127.5,
127.1; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.1e
7-Fluoro-3-phenylquinoline (5b)
Compound 5b was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 50:1) afforded 5b (23.2 mg, 35%) as a red solid; m.p. 72.8-73.9 oC ; 1H NMR (400 MHz, CDCl3) δ 9.18 (d, J = 2.2 Hz,
1H), 8.28 (d, J = 2.1 Hz, 1H), 7.87 (dd, J = 9.0, 6.0 Hz, 1H), 7.77 (dd, J = 10.0, 2.5 Hz, 1H), 7.70-7.68 (m, 2H), 7.55-7.51 (m,
2H), 7.46-7.42 (m, 1H), 7.40-7.35 (m, 1H); 13C{1H} NMR (101 MHz, CDCl3) δ 163.0 (d, JF-C = 250.1 Hz), 150.9, 148.2 (d, JF-C
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12.6 Hz), 137.6, 133.4, 133.2, 130.0 (d, JF-C = 9.9 Hz), 129.3, 128.2, 127.4, 125.1, 117.6 (d, JF-C = 25.5 Hz), 112.9 (d, JF-C = 20.4
Hz); 19F NMR (376 MHz, CDCl3) δ -109.34; HRMS (ESI-TOF) m/z: [M+H]+ calcd for C15H11FN 224.0870; found 224.0872.
7-Chloro-3-phenylquinoline (5c)
Compound 5c was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 50:1) afforded 5c (42.6 mg, 60%) as a yellow solid; m.p. 91.8-92.5 oC; 1H NMR (400 MHz, CDCl3) δ 9.17 (d, J = 2.1
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Hz, 1H), 8.25 (s, 1H), 8.12 (s, 1H), 7.79 (d, J = 8.7 Hz, 1H), 7.68 (d, J = 7.3 Hz, 2H), 7.52 (t, J = 7.5 Hz, 3H), 7.44 (t, J = 7.3 Hz,
1H); 13C{1H} NMR (101 MHz, CDCl3) δ 150.9, 147.6, 137.5, 135.1, 134.1, 133.0, 129.3, 129.2, 128.4, 128.3, 128.1, 127.4,
126.4; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.46
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7-Bromo-3-phenylquinoline (5d)
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9.18 (d, J = 2.3 Hz, 1H), 8.29 (dd, J = 22.6, 1.9 Hz, 2H), 7.75-7.64 (m, 4H), 7.53 (t, J = 7.5 Hz, 2H), 7.47-7.43 (m, 1H); 13C{1H}
NMR (101 MHz, CDCl3) δ 150.9, 147.9, 137.5, 134.2, 133.1, 131.6, 130.6, 129.3, 128.4, 127.4, 126.7, 123.4; The 1H NMR and
13C NMR spectra data are consistent with the reported literature.47
7-(Trifluoromethyl)-3-phenylquinoline (5e)
Compound 5e was synthesized in accordance with the typical procedure (110 oC, 30 h). Purification by column chromatography
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on silica gel (PE:EA = 50:1) afforded 5e (71.8 mg, 88%) as a yellow solid; m.p. 137.2-138.9 C; H NMR (400 MHz, CDCl3) δ
9.27 (d, J = 2.3 Hz, 1H), 8.44 (d, J = 0.4 Hz, 1H), 8.32 (d, J = 2.1 Hz, 1H), 7.98 (d, J = 8.5 Hz, 1H), 7.75-7.71 (m, 3H), 7.57-7.53
(m, 2H), 7.48 (dt, J = 9.5, 4.3 Hz, 1H); 13C{1H} NMR (101 MHz, CDCl3) δ 151.4, 146.2, 137.1, 135.7, 132.9, 131.0 (q, JF-C
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32.6 Hz), 129.5, 129.4, 129.2, 128.7, 127.5, 127.2 (q, JF-C = 4.5 Hz), 124.0 (q, JF-C = 272.4 Hz), 122.7 (q, JF-C = 3.1 Hz); 19F NMR
(376 MHz, CDCl3) δ -62.51; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.48
7-Nitro-3-phenylquinoline (5f)
Compound 5f was synthesized in accordance with the typical procedure (110 oC, 30 h). Purification by column chromatography
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on silica gel (PE:EA = 20:1) afforded 5f (48.3 mg, 64%) as a yellow solid; m.p. 176.6-177.2 C; H NMR (400 MHz, CDCl3) δ
9.34 (d, J = 2.1 Hz, 1H), 9.03 (d, J = 1.6 Hz, 1H), 8.39-8.34 (m, 2H), 8.03 (d, J = 9.0 Hz, 1H), 7.75 (d, J = 7.6 Hz, 2H), 7.54 (dt,
J = 26.9, 7.3 Hz, 3H); 13C{1H} NMR (101 MHz, CDCl3) δ 152.4, 147.8, 146.1, 136.7, 136.7, 132.7, 131.3, 129.6, 129.5, 129.1,
127.6, 125.7, 120.6; HRMS (ESI-TOF) m/z: [M+H]+ calcd for C15H11N2O2 251.0815; found 251.0814.
6-Methoxy-3-phenylquinoline (5g)
Compound 5g was synthesized in accordance with the typical procedure (110 oC, 30 h). Purification by column chromatography
on silica gel (PE:EA = 10:1) afforded 5g (76.5 mg, 91%) as a white solid; m.p. 115.8-116.7 oC (118.0-119.0 oC)8e; 1H NMR (400
MHz, CDCl3) δ 9.02 (d, J = 2.2 Hz, 1H), 8.17 (d, J = 2.1 Hz, 1H), 8.02 (d, J = 9.2 Hz, 1H), 7.70-7.68 (m, 2H), 7.51 (t, J = 7.6 Hz,
2H), 7.44-7.40 (m, 1H), 7.36 (dd, J = 9.2, 2.8 Hz, 1H), 7.10 (d, J = 2.7 Hz, 1H), 3.93 (s, 3H); 13C{1H} NMR (101 MHz, CDCl3) δ
158.1, 147.5, 143.5, 138.1, 134.1, 132.1, 130.6, 129.2, 129.1, 128.1, 127.5, 122.3, 105.3, 55.6; The 1H NMR and 13C NMR
spectra data are consistent with the reported literature.8e
6-Fluoro-3-phenylquinoline (5h)
Compound 5h was synthesized in accordance with the typical procedure (110 oC, 30 h). Purification by column chromatography
on silica gel (PE:EA = 20:1) afforded 5h (65.8 mg, 98%) as a red solid; m.p. 86.1-87.2oC ; 1H NMR (400 MHz, CDCl3) δ 9.12 (d,
J = 2.2 Hz, 1H), 8.21 (d, J = 1.4 Hz, 1H), 8.14-8.10 (m, 1H), 7.70-7.68 (m, 2H), 7.54-7.42 (m, 5H); 13C{1H} NMR (101 MHz,
CDCl3) δ 160.8 (d, JF-C = 248.5 Hz), 149.3 (d, J = 2.8 Hz), 144.4, 137.5, 134.6, 132.6 (d, JF-C = 5.4 Hz), 131.8 (d, JF-C = 9.3 Hz),
129.3, 128.8 (d, JF-C = 10.2 Hz), 128.4, 127.5, 119.65 (d, JF-C = 25.8 Hz), 110.9 (d, JF-C = 21.7 Hz); 19F NMR (376 MHz, CDCl3)
δ -112.71; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.46
7-Phenyl-[1,3]dioxolo[4,5-g]quinoline (5i)
Compound 5i was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 10:1) afforded 5i (69.2 mg, 93%) as a red solid; m.p. 54.6-55.8 oC (67.0-70.0 oC)49; 1H NMR (400 MHz, CDCl3) δ 8.93
(d, J = 2.3 Hz, 1H), 8.06 (d, J = 2.2 Hz, 1H), 7.65 (dd, J = 5.2, 3.3 Hz, 2H), 7.48 (t, J = 7.6 Hz, 2H), 7.41-7.38 (m, 2H), 7.05 (s,
1H), 6.07 (s, 2H); 13C{1H} NMR (101 MHz, CDCl3) δ 150.7, 148.2, 147.4, 145.6, 138.0, 132.5, 132.3, 129.1, 127.9, 127.2, 125.1,
105.6, 102.9, 101.8; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.49
6-Chloro-3,4-diphenylquinoline (5j)
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Compound 5j was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
(PE:EA = 50:1) afforded 5j (65.3 mg, 69%) as a red solid; m.p. 188.2-189.4 oC (196.2-197.4 oC)7h; 1H NMR (400 MHz, CDCl3) δ
8.99 (s, 1H), 8.13 (d, J = 9.5 Hz, 1H), 7.68-7.65 (m, 2H), 7.38-7.37 (m, 3H), 7.26-7.24 (m, 3H), 7.19-7.14 (m, 4H); 13C{1H}
NMR (101 MHz, CDCl3) δ 152.1, 146.0, 144.7, 137.7, 135.6, 133.9, 132.9, 131.2, 130.4, 130.1, 130.0, 128.4, 128.2, 128.1, 128.0,
127.3, 125.4; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.7h
4-Methyl-3-phenylquinoline (5k)
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Compound 5k was synthesized in accordance with the typical procedure. Purification by column chromatography on silica gel
1
(PE:EA = 50:1) afforded 5k (15.0 mg, 23%) as a yellow oil; H NMR (400 MHz, CDCl3) δ 8.80 (s, 1H), 8.15-8.09 (m, 2H),
7.75-7.71 (m, 1H), 7.64-7.60 (m, 1H), 7.51 (dd, J = 11.3, 4.4 Hz, 2H), 7.45 (dt, J = 4.9, 2.0 Hz, 1H), 7.41-7.39 (m, 2H), 2.65 (s,
3H); 13C{1H} NMR (101 MHz, CDCl3) δ 151.6, 150.0, 140.6, 138.7, 134.5, 130.0, 130.0, 128.9, 128.5, 128.0, 127.6, 126.8,
124.3, 15.7; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.1e
3-(p-Tolyl)quinoline (5l)
o
Compound 5l was synthesized in accordance with the typical procedure (110 C, 30 h). Purification by column chromatography
o
o
1
on silica gel (PE:EA = 50:1) afforded 5l (56.0 mg, 85%) as a red solid; m.p. 77.6-78.1 C (81-82 C)1e; H NMR (400 MHz,
CDCl3) δ 9.10 (d, J = 2.3 Hz, 1H), 8.21 (d, J = 2.2 Hz, 1H), 8.06 (d, J = 8.4 Hz, 1H), 7.80 (d, J = 7.6 Hz, 1H), 7.66-7.62 (m, 1H),
7.56-7.48 (m, 3H), 7.26 (d, J = 8.0 Hz, 2H), 2.36 (s, 3H); 13C{1H} NMR (101 MHz, CDCl3) δ 150.0, 147.2, 138.1, 135.0, 133.8,
1
132.9, 130.0, 129.3, 129.2, 128.1, 128.0, 127.3, 127.0, 21.2; The H NMR and 13C NMR spectra data are consistent with the
reported literature.1e
3-(4-Methoxyphenyl)quinoline (5m)
Compound 5m was synthesized in accordance with the typical procedure (110 oC, 30 h). Purification by column chromatography
on silica gel (PE:EA = 20:1) afforded 5m (39.5 mg, 56%) as a yellow solid; m.p. 69.2-70.2 oC (80-81 oC)1e; 1H NMR (400 MHz,
CDCl3) δ 9.16 (d, J = 2.3 Hz, 1H), 8.23 (d, J = 2.0 Hz, 1H), 8.12 (d, J = 8.4 Hz, 1H), 7.84 (d, J = 8.2 Hz, 1H), 7.71-7.63 (m, 3H),
7.57-7.53 (m, 1H), 7.06-7.04 (m, 2H), 3.87 (s, 3H); 13C{1H} NMR (101 MHz, CDCl3) δ 159.8, 149.9, 147.0, 133.5, 132.4, 130.3,
1
129.2, 129.1, 128.5, 128.1, 127.9, 127.0, 114.7, 55.4; The H NMR and 13C NMR spectra data are consistent with the reported
literature.1e
3-(4-(tert-Butyl)phenyl)quinoline (5n)
Compound 5n was synthesized in accordance with the typical procedure (110 oC, 30 h). Purification by column chromatography
on silica gel (PE:EA = 50:1) afforded 5n (23.9 mg, 43%) as an orange semisolid; 1H NMR (400 MHz, CDCl3) δ 9.20 (d, J = 2.3
Hz, 1H), 8.29 (d, J = 2.2 Hz, 1H), 8.13 (d, J = 8.4 Hz, 1H), 7.88-7.86 (m, 1H), 7.73-7.66 (m, 3H), 7.58-7.54 (m, 3H), 1.39 (s, 9H);
13C{1H} NMR (101 MHz, CDCl3) δ 151.3, 150.0, 147.2, 135.0, 133.7, 133.0, 129.3, 129.2, 128.1, 128.0, 127.1, 127.0, 126.2,
34.7, 31.4; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.49
3-(4-Chlorophenyl)quinoline (5o)
Compound 5o was synthesized in accordance with the typical procedure (110 oC, 30 h). Purification by column chromatography
on silica gel (PE:EA = 30:1) afforded 5o (43.0 mg, 60%) as a red solid; m.p. 131.2-132.4 oC; 1H NMR (400 MHz, CDCl3) δ 9.13
(d, J = 2.3 Hz, 1H), 8.26 (d, J = 2.2 Hz, 1H), 8.13 (d, J = 8.5 Hz, 1H), 7.87 (d, J = 8.2 Hz, 1H), 7.75-7.71 (m, 1H), 7.64-7.56 (m,
3H), 7.50-7.47 (m, 2H); 13C{1H} NMR (101 MHz, CDCl3) δ 149.5, 147.4, 136.3, 134.4, 133.2, 132.6, 129.7, 129.4, 129.3, 128.7,
128.0, 127.9, 127.2; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.1e
3-(o-Tolyl)quinoline (5q)
Compound 5q was synthesized in accordance with the typical procedure (110 oC, 30 h). Purification by column chromatography
1
on silica gel (PE:EA = 100:1) afforded 5q (25.7 mg, 40%) as a red oil; H NMR (400 MHz, CDCl3) δ 8.93 (d, J = 2.2 Hz, 1H),
8.13 (dd, J = 22.1, 5.2 Hz, 2H), 7.86 (d, J = 8.1 Hz, 1H), 7.77-7.73 (m, 1H), 7.62-7.58 (m, 1H), 7.35-7.33 (m, 4H), 2.34 (s, 3H);
13C{1H} NMR (101 MHz, CDCl3) δ 151.5, 147.0, 138.1, 135.9, 135.4, 134.8, 130.7, 130.2, 129.5, 129.3, 128.2, 127.9, 127.8,
127.0, 126.2, 20.5; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.49
3-(m-Tolyl)quinoline (5r)
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Compound 5r was synthesized in accordance with the typical procedure (110 oC, 30 h). Purification by column chromatography
on silica gel (PE:EA = 100:1) afforded 5r (41.5 mg, 63%) as a brown oil; 1H NMR (400 MHz, CDCl3) δ 9.17 (d, J = 2.2 Hz, 1H),
8.29 (d, J = 1.9 Hz, 1H), 8.14 (d, J = 8.4 Hz, 1H), 7.87 (d, J = 8.1 Hz, 1H), 7.74-7.69 (m, 1H), 7.59-7.50 (m, 3H), 7.41 (t, J = 7.6
Hz, 1H), 7.27-7.23 (m, 1H), 2.47 (s, 3H); 13C{1H} NMR (101 MHz, CDCl3) δ 150.1, 147.3, 138.9, 137.9, 134.0, 133.3, 129.4,
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129.2, 129.1, 128.9, 128.2, 128.1, 128.0, 127.0, 124.6, 21.6; The H NMR and 13C NMR spectra data are consistent with the
reported literature.49
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3-Cyclohexylquinoline (5s)
o
Compound 5s was synthesized in accordance with the typical procedure (110 C, 30 h). Purification by column chromatography
on silica gel (PE:EA = 50:1) afforded 5s (21.7 mg, 25%) as a yellow oil; 1H NMR (400 MHz, CDCl3) δ 8.81 (d, J = 2.2 Hz, 1H),
8.07 (d, J = 8.4 Hz, 1H), 7.92 (d, J = 1.9 Hz, 1H), 7.78 (d, J = 8.1 Hz, 1H), 7.67-7.63 (m, 1H), 7.52 (t, J = 7.5 Hz, 1H), 2.76-2.68
(m, 1H), 2.00-1.79 (m, 6H), 1.58-1.41 (m, 4H); 13C{1H} NMR (101 MHz, CDCl3) δ 151.5, 146.9, 140.4, 132.3, 129.1, 128.5,
128.3, 127.5, 126.5, 42.0, 34.2, 26.8, 26.0; The 1H NMR and 13C NMR spectra data are consistent with the reported literature.50
ASSOCIATED CONTENT
Supporting Information
The Supporting Information is available free of charge on the ACS Publications website at DOI:.
Copies of 1H, 13C{1H} and 19F NMR spectra (PDF)
AUTHOR INFORMATION
Corresponding Author
*E-mail: zoulianghua@jiangnan.edu.cn
ORCID
Liang-Hua Zou: 0000-0003-0939-6016
Hao Zhu: 0000-0002-8059-9521
Ping-Gui Li: 0000-0003-1729-3682
Author Contributions
§
H.Z. and S.Z. contributed equally to this work.
Notes
The authors declare no competing financial interest.
ACKNOWLEDGMENTS
This work was financially supported by NSF of Jiangsu Province (BK20150129), and the Top-notch Academic Programs Project
of Jiangsu Higher Education Institutions (No. PPZY2015B146).
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