Copper-catalyzed radical methylation/C-H amination/oxidation cascade for the synthesis of quinazolinones

Article abstract of DOI:10.1021/acs.joc.5b00191

A copper-catalyzed radical methylation/sp³ C-H amination/oxidation reaction for the facile synthesis of quinazolinone was developed. In this cascade reaction, dicumyl peroxide acts not only as a useful oxidant but also as an efficient methyl source. Notably, a methyl radical, generated from peroxide, was confirmed by electron paramagnetic resonance for the first time.

Full text of DOI:10.1021/acs.joc.5b00191

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Note
Copper-Catalyzed Radical Methylation/C-H Amination/
Oxidation Cascade for the Synthesis of Quinazolinones
Yajie Bao, Yizhe Yan, Kun Xu, Jihu Su, Zhenggen Zha, and Zhiyong Wang
J. Org. Chem., Just Accepted Manuscript • Publication Date (Web): 07 Apr 2015
Downloaded from http://pubs.acs.org on April 7, 2015
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Copper-Catalyzed Radical Methylation/C-H Amination/
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Oxidation Cascade for the Synthesis of Quinazolinones
Yajie Bao, Yizhe Yan, Kun Xu, Jihu Su, Zhenggen Zha and Zhiyong Wang*
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Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft
Matter Chemistry and Department of Chemistry & Collaborative Innovation Center of Suzhou
Nano Science and Technology, University of Science and Technology of China, Hefei, Anhui
230026, P. R. China
E-mail: zwang3@ustc.edu.cn
ABSTRACT: A copper-catalyzed radical methylation/sp3 C-H amination/oxidation reaction for the
facile synthesis of quinazolinone was developed. In this cascade reaction, dicumyl peroxide (DCP) acts
not only as a useful oxidant, but also as an efficient methyl source. Notably, a methyl radical, generated
from peroxide, was confirmed by electron paramagnetic resonance (EPR) for the first time.
The use of peroxides as methylation reagents has gained increasing attention in recent years. In
2008, Li developed a novel method for the direct methylation of aryl C-H bonds. In this reaction,
dicumyl peroxide (DCP) was first used as both methylating reagents and hydrogen acceptor
(Scheme 1a).1a Recently, a copper-catalyzed N-methylation of amides and O-methylation of
carboxylic acids was developed with DCP as the methylating reagent by Chen’s group (Scheme
1b).1b In the same year, Mao reported the copper-catalyzed methyl esterification of benzylic
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alcohols, aldehydes, and acids using TBHP as the methylating reagent (Scheme 1b).1c Very
recently, Cheng and Li respectively reported the iron-catalyzed radical arylmethylation of
activated alkenes using di-tert-butylperoxide (DTBP) or DCP as the methyl source, leading to the
biologically active product 3-ethyl-3-substituted indolin-2-one (Scheme 1c).1d, 1e In light of these
results above, we reasoned that peroxides could be used as a methyl source for the construction of
other useful compounds.
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Scheme 1. The radical methylation reaction.
On the other hand, transition-metal-catalyzed oxidative amination of sp3 C-H bond has emerged
as a powerful and versatile method to form C-N bonds for its straightforward and
atom-economical advantages, avoiding tedious prefunctionalized processes.2 In particular, copper
as an inexpensive and less toxic metal catalyst, has been widely used to catalyze the sp3 C-H
amination reaction.3 Our group has also been focused on developing sp3 C-H amination for the
synthesis of heterocycles.4 Notably, quinazolinone as an important structural unit has been widely
found in many natural products and pharmaceuticals.5 Many great efforts have been made towards
their construction starting from a variety of substrates,6 among which 2-amino benzamide is
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probably the most typical one. Herein, we demonstrated a facile method for the synthesis of
N-substituted quinazolinones starting from anthranilamides using DCP as the methyl source
(Scheme 1d). This reaction involved a tandem N-methylation-sp3 C-H amination-oxidation
process in the presence of a copper catalyst.
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Table 1. Optimization of reaction conditions. a
Entry
1
Catalyst
Base
Peroxide T(°C ) Yieldb (%)
Cu(OAc)2•H2O
Cu(OAc)2•H2O
Cu(OAc)2•H2O
Cu(OAc)2•H2O
Cu(OAc)2•H2O
Cu(OAc)2•H2O
DCP
DCP
DCP
DCP
DCP
DCP
DCP
DCP
DCP
DCP
DCP
TBHP
TBPB
DTBP
DCP
120
120
120
120
120
120
120
120
120
120
120
120
120
120
110
20c
65c
25c
28c
35c
50c
82 (74)d
50
2
Imidazole
NEt3
3
4
DBU
5
Pyridine
DMAP
6
7
Cu(OAc)2•H2O Imidazole
8
Imidazole
9
Cu(OAc)2•H2O
CuCl
Imidazole
Imidazole
Imidazole
Imidazole
Imidazole
Imidazole
Imidazole
74e
70
10
11
12
13
14
15
Cu(OTf)2
54
Cu(OAc)2•H2O
Cu(OAc)2•H2O
Cu(OAc)2•H2O
Cu(OAc)2•H2O
20
n.d.
40
70
16
17
18
19
Cu(OAc)2•H2O
Cu(OAc)2•H2O
Cu(OAc)2•H2O
Cu(OAc)2•H2O
Imidazole
Imidazole
Imidazole
Imidazole
DCP
DCP
DCP
DCP
130
120
120
120
72
69f
56g
79h
a Reaction conditions: 1a (0.2 mmol), peroxide (0.6 mmol), catalyst (0.04 mmol), base (0.4 mmol),
PhCl (0.5 mL), 10 h. b Isolated yield. c PhCl (1.0 mL). d The data in parentheses is the result when
1a was 0.5 mmol and the reaction time was 24 h. e 10 mol% Cu(OAc)2•H2O was used. f Under N2.
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g
h
DCP (1 equiv.) was used. DCP (2 equiv.) was used. (NEt3 = Triethylamine, DBU =
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1,8-Diaza-7-bicyclo[5.4.0]undecene, DMAP
= 4-(N,N-Dimethylamino)pyridine, TBHP =
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tert-butyl hydroperoxide (70% in aqueous), TBPB = Benzoyl tert-butyl peroxide, DTBP =
di-tert-butylperoxide, n.d. = not detected.)
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Initially, we began our study with the reaction of 1 equiv. of 2-amino-N-phenyl-benzanilide (1a)
and 3 equiv. of DCP as the oxidant in the presence of 20 mol% of Cu(OAc)2•H2O as the catalyst.
When the reaction mixture was stirred in 1 mL of PhCl at 120 °C for 10 h under air,
3-phenyl-4(3H)-quinazolinone (2a) was obtained only in 20% yield (Table 1, entry 1). To improve
the reaction yield, 2 equiv. of bases were employed. To our delight, imidazole gave the best result
with 65% yield (Table 1, entries 2-6). Besides, reducing the volume of solvent from 1 mL to 0.5
mL obviously increased the yield to 82% (Table 1, entry 7). In the absence of copper salt, the
corresponding product 2a was obtained in 50% yield, while reducing the amount of
Cu(OAc)2•H2O to 10 mol% also decreased the yield, which showed that copper catalysts played
an important role in this transformation (Table 1, entries 8-9). Other copper catalysts such as CuCl,
Cu(OTf)2 gave lower yields (Table 1, entries 10-11). Subsequently, various oxidants such as TBHP,
TBPB and DTBP were also examined, but failed to give better results (Table 1, entries 12-14).
After a brief survey of reaction temperature, the optimal reaction temperature was 120 °C (Table 1,
entries 15-16). Considering the atom-economy synthesis, we reduced the amount of DCP to 2.0
and 1.0 equiv. and lower reaction yields were observed (Table 1, entries 18-19). Thus, the optimal
reaction conditions were determined as described in entry 7.
To examine the substrate scope of this protocol, the optimized reaction conditions were then
applied to the synthesis of a variety of quinazolinones (Table 2). Firstly, when R1 was an aromatic
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substituent, the corresponding products (2aa-oa) were obtained in moderate to good yields. It is
noted that o-amino-benzanilide bearing electron-withdrawing groups (4-CF3, 4-Cl or 4-F) on the
phenyl ring of R1 gave the desired products in higher yields than electron-donating groups (4-CH3,
4-OCH3, 4-n-Bu or 4-t-Bu) on the phenyl ring. Similarly, the effect of steric hindrance on the
phenyl ring of R1 had little influence on the reaction. Subsequently, substrates with aliphatic
substituents, such as benzyl, isopropyl, n-butyl and cyclohexyl (2qa-ta), can be employed in this
reaction to give the corresponding products smoothly in spite of slightly lower yields. Finally,
o-amino-benzanilides with various R2 substitutes were also employed in this reaction, giving the
desired products 2ab-ag in moderate yields.
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Table 2. Synthesis of various quinazolinones. a
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a Reaction conditions: 1a (0.2 mmol), DCP (0.6 mmol), Cu(OAc)2•H2O (0.04 mmol), Imidazole
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(0.4 mmol), PhCl (0.5 mL), 120 °C, 10 h. b Isolated yield.
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To gain an insight into the reaction mechanism, the active intermediates were studied (Scheme
2). Firstly, we observed that the reaction was obviously inhibited in the presence of 3.0 equiv.
radical scavenger, 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO). The radical trapping product 3
was also detected by GC-MS (see SI for details). The methyl radical was further trapped by
5,5-dimethyl-1-proline-N-oxide (DMPO) in the EPR experiments.7 In Figure 1, EPR spectra of the
signal a, i.e. the DMPO-CH3 adduct radical, was identified by the characteristic hyperfine
constants for the nitrogen and proton A14N = 15.6 G and A1H = 23.2 G, respectively. Another signal
b was assigned to oxidized DMPO with an A14N = 14.9 G for the nitrogen, which was possibly
oxidized by DCP, although the precise mechanism was not clear. This observation implied that the
reaction presumably involved a free methyl radical.
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Exp
Sim
0.6
b
b
a
a
a
b
a
a
a
0.3
0.0
-0.3
3200
3220
3240
3260
3280
Magnetic field (Gauss)
Figure 1. EPR spectra (X band, 9.07 GHz, room temperature) for reaction mixtures in the
presence of the radical trapper DMPO (0.5 mol/L). In the spectra, a is assigned to the DMPO-CH3
radical, while b is assigned to oxidized DMPOX (Sim = simulation, Exp = experiment).
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Moreover, the possible intermediates of this reaction were also investigated. When
2-(methylamino)-N-phenylbenzamide 4 and 2-amino-N-methyl-N-phenylbenzamide 5 were
carried out under the standard reaction conditions, the desired product 2a was obtained in 50% and
15% yield respectively. These results indicated that both 4 and 5 are intermediates. And the
compound 4 may be the major intermediate.
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Scheme 2. Control experiments.
On the basis of the results above and previous reports,1b a plausible mechanism is proposed
(Scheme 3). Initially, the thermal cleavage of DCP produces a tert-butoxy radical, which is
converted to a methyl radical by the loss of one equivalent of acetophenone. Then methyl radical
is transformed into methyl cation via a single electron transfer (SET) process in the presence of
Cu2+. The intermediate 4 or 5 can be formed via the nucleophilic attack of 1a to methyl cation.
The intermediate 4 then generates radical A1 via a SET process in the presence of Cu2+. Then
intermediate B1 is formed through removing a hydrogen radical from A1. B1 can be further
subjected to intramolecular nucleophilic attack to give the amination product C. Finally, the
further oxidation of C gives the quinazolinone 2a. Meanwhile, the product 2a is probably
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generated from 5 via a minor pathway. In entire pathway, imidazole is used as base to accept
hydrogen.
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CONCLUSION
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In summary, we have developed a facile method for the synthesis of quinazolinones from
anthranilamides. The reaction undergoes a copper-catalyzed tandem radical methylation/sp3 C-H
amination/oxidation pathway. It is noted that DCP was not only an oxidant, but also an efficient
methylation reagent. Meanwhile, this reaction has wide substrate scope and good functional group
tolerance, which represents a new avenue for practical multiple C-N bond formation. Further
investigation to synthesize other heterocycles by this method is currently in progress.
Scheme 3. Proposed mechanism.
Experiment Section
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General Information: Unless otherwise indicated, all commercial reagents and solvents were
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used without additional purification. H NMR, 13C NMR using TMS as internal reference (1H
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NMR 400 MHz, 13C NMR 100 MHz).
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General procedure for the synthesis of quinazolinones: 2-amino-N-phenyl-benzanilide 1a (0.2
mmol, 42.4 mg), DCP (0.6 mmol, 162 mg), Cu(OAc)2•H2O (0.04 mmol, 8 mg) and imidazole (0.4
mmol, 27.2 mg) in PhCl (0.5 mL) were heated at 120 ºC for 10 h in air. The completion of the
reaction was monitored by TLC and purified by column chromatography over silica gel to give the
pure product 2a as an orange solid (36 mg, 82 % yield).
Preparation of substrates
Synthesis of 1a, 1aa-fa, 1ha-oa
Isatoic anhydride (815 mg, 5 mmol) was dissolved in EtOH (10 mL) with aniline (916 uL, 5 mmol)
and I2 (127 mg, 0.5 mmol). The mixture was stirred under reflux in air overnight. Then the
reaction mixture was concentrated in vacuo. Washed with EtOAc and Na2S2O3 saturated solution
for three times, then the organic layer washed with brine and dried over anhydrous Na2SO4. The
organic phase was concentrated in vacuum and purified by chromatographic column on silica gel,
giving 2-Amino-N-phenylbenzamide (1a) as a light yellow solid (715 mg, yield 67%).8
1aa-fa, 1ha-oa was synthesized according to the procedure for 1a.
Synthesis of 1ga, 1pa
o-nitrobenzoic acid (835 mg, 5 mmol) were dissolved in dry DCM (5 mL) under N2. After cooling
to 0 ºC , thionyl chloride (726 uL, 10 mmol) with DCM (5 mL) solution was added slowly. The
mixture was then allowed to warm to 40 ºC for 3-6 h. Subsequently, the reaction mixture
concentrated in vacuo to leave the crude product as a light yellow oil.4e
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o-nitrobenzoyl chloride (5 mmol) in CHCl3 was treated with 2-trifluoromethyl phenylamine
(628 uL, 5 mmol) under N2 atmosphere at reflux for 3 h. Upon cooling, the reaction mixture was
diluted with CHCl3 and washed consecutively with aq 1 M HCl and saturated NaHCO3 solution.
The organic layer was dried over anhydrous Na2SO4 and concentrated under reduced pressure.
The mixture was used for next step without further purification.9
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Eight drops of concentrated HCl were added to the solution of N-(2-trifluoromethylphenyl)-2-
nitrobenzamide (5 mmol) in EtOH (16 mL) and water (4 mL) with iron powder (1.12 g, 20 mmol).
The reaction was refluxed at 80 ºC for 2 h, filtrated through silica gel and the filtrate was
concentrated under reduced pressure. Then washed with EtOAc and saturated NaHCO3 solution
and brine. The organic layer was dried over anhydrous Na2SO4 and concentrated in vacuum under
reduced pressure and purified by chromatographic column on silica gel, giving N-(2-
trifluoromethylphenyl)-2-aminobenzamide (1ga) as a light yellow solid (642 mg, the total yield of
three steps was 46%).4e
1pa was synthesized according to the procedure for 1ga.
Synthesis of 1qa-1ta
Isatoic anhydride (815 mg, 5 mmol) in DMF was treated with benzylamine (547 uL, 5 mmol) at
50-60 ºC for 1 h. After the completion, the mixture was washed with EtOAc and H2O. The organic
layer was dried over anhydrous Na2SO4 and concentrated in vacuum under reduced pressure and
purified by chromatographic column on silica gel, giving 2-amino-N-(phenylmethyl)-benzamide
(1qa) as a white solid (1100 mg, yield 98 %).10
1ra-1ta was synthesized according to the procedure for 1qa.
Synthesis of 1ab-1ag
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CrO3 (833 mg, 8.33 mmol) was added portionwise to a hot (90 °C) suspension of the 5-
Methylisatin (806 mg, 5 mmol) in glacial AcOH (4 ml) and Ac2O (4 ml). The mixture was heated
at 90 °C for 2 h. After cooling at room temperature, the suspension was diluted with water (50 ml)
and the solid collected and abundantly washed with H2O. The obtained mixture was used for next
step without further purification (796 mg, yield 90%).11
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The mixture was dissolved in EtOH (10 mL) with aniline (916 uL, 5 mmol) and I2 (127 mg, 0.5
mmol). The mixture was stirred under reflux in air overnight. Then the reaction mixture was
concentrated in vacuo. Washed with EtOAc and saturated Na2S2O3 solution for three times,
washed with brine and dried over anhydrous Na2SO4. The organic phase was concentrated in
vacuum and purified by chromatographic column on silica gel, giving 2-amino-5-methyl-N-
phenylbenzamide (1ab) as a light yellow solid (780 mg, yield 69 %).8
1ac-ag was synthesized according to the procedure for 1ab.
Further investigation about mechanism
Experimental details for the capture of radical: An 10 mL reaction tube was equipped with a
magnet stirrer, than 2-Amino-N-phenylbenzamide (1a) (0.2 mmol, 42.4 mg), DCP (0.6 mmol, 162
mg), Cu(OAc)2•H2O (0.04 mmol, 8 mg) and imidazole (0.4 mmol, 27.2 mg) in mesitylene (0.5
mL) were heated at 120 ºC for 1 h in air. 50 uL solution was taken out into a small tube, mixed
well with 0.3 ml DMPO aqueous solution. Then this mixture was quick-freezed with liquid
nitrogen and analyzed by EPR. The EPR measurements were performed at room temperature.
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Scheme 4. The reaction of DMPO
The intermediate radical 1 trapped by DMPO was characterized by the hyperfine coupling
(hfc). The hyperfine constants for the nitrogen and proton in a were A14N = 15.6 G and A1H
=
23.2 G, respectively. And DMPO can be readily oxidized by DCP. The oxidized DMPO with an
A14N = 14.9 G for the nitrogen (Scheme 4).
Characterization Data for the Products
3-phenyl-4(3H)-Quinazolinone (2a)6b:
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether: ethyl acetate = 3:1) to give light yellow solid (36 mg, 82%). m.p. 136-137 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.39-8.36 (d, J = 12 Hz, 1 H), 8.14 (s, 1 H), 7.83-7.76 (m, 2H), 7.58-7.42
(m, 6H). 13C NMR (100 MHz, CDCl3) δ (ppm) 160.8, 147.9, 146.1, 137.5, 134.6, 129.7, 129.2,
127.7, 127.6, 127.2, 127.2, 122.4.
3-(2-methylphenyl)-4(3H)-Quinazolinone (2aa)12:
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light red solid (35 mg, 75%). m.p. 136-137 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.38-8.37 (d, J = 7.8 Hz, 1H), 8.00 (s, 1 H), 7.82-7.78 (m, 2H), 7.58-7.53
(m, 1H), 7.42-7.36 (m, 3H), 7.26-7.24 (d, J = 7.3 Hz, 1H), 2.20 (s, 3H). 13C NMR (100 MHz,
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CDCl3) δ (ppm) 160.5, 148.1, 146.4, 136.7, 135.9, 134.6, 131.4, 129.8, 127.9, 127.6, 127.6, 127.4,
127.2, 122.4, 17.8.
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3-(3-methylphenyl)-4(3H)-Quinazolinone (2ba)12:
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Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light red solid (29 mg, 61%). m.p. 136-137 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.37-8.35 (d, J = 8.4 Hz，1H), 8.15 (s, 1H), 7.80-7.77 (m, 2H), 7.57-7.53
(m, 1H), 7.45-7.41 (m, 1H), 7.31-7.29 (d, J = 7.6 Hz，1H), 7.23-7.20 (m, 2H), 2.43 (s, 3H). 13C
NMR (100 MHz, CDCl3) δ (ppm) 160.7, 147.5, 146.3, 139.9, 137.3, 134.7, 130.0, 129.5, 127.7,
127.6, 127.3, 127.2, 124.0, 122.3, 21.4.
3-(4-methylphenyl)-4(3H)-Quinazolinone (2ca)6b:
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light red solid (31 mg, 65%). m.p. 150-151 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.36-8.34 (d, J = 7.8 Hz, 1H), 8.14 (s, 1H), 7.80-7.76 (m, 2H), 7.56-7.52
(m, 1H), 7.35-7.28 (m, 4H), 2.43 (s, 3H). 13C NMR (100 MHz, CDCl3) δ (ppm) 160.8, 147.5,
146.4, 139.3, 134.8, 134.6, 130.3, 127.7, 127.4, 127.2, 126.7, 122.3, 21.2.
3-(2-methoxyphenyl)-4(3H)-Quinazolinone (2da)12:
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give red solid (30 mg, 60%). m.p. 156-157 ºC . 1H NMR (400 MHz,
CDCl3) δ (ppm) 8.37-8.35 (d, J = 8.5 Hz, 1H), 7.98 (s, 1H), 7.79-7.77 (m, 2H), 7.54-7.45 (m, 2H),
7.35-7.33 (dd, J1 = 7.6 Hz, J2 = 1.5 Hz, 1H), 7.12-7.07 (m, 2H), 3.80 (s, 3H). 13C NMR (100 MHz,
CDCl3) δ (ppm) 160.7, 154.7, 148.0, 147.2, 134.4, 130.9, 129.1, 127.5, 127.3, 127.2, 126.0, 122.7,
121.0, 112.3, 55.8.
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3-(3-methoxyphenyl)-4(3H)-Quinazolinone (2ea)12:
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Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give white solid (35 mg, 70%). m.p. 164-166ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.37-8.35 (d, J = 7.8 Hz, 1H), 8.12 (s, 1H), 7.80-7.75 (m, 2H), 7.56-7.52
(m, 1H), 7.46-7.42 (m, 1H), 7.03-6.97 (m, 3H), 3.84 (s, 3H). 13C NMR (100 MHz, CDCl3) δ
(ppm) 160.7, 160.4, 147.9, 146.1, 138.5, 134.6, 130.4, 127.7, 127.6, 127.2, 122.4, 119.1, 115.1,
112.9, 55.6.
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3-(4-methoxyphenyl)-4(3H)-Quinazolinone (2fa)6b:
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light yellow solid (33 mg, 66%). m.p. 209-210 ºC . 1H NMR
(400 MHz, CDCl3) δ (ppm) 8.35-8.33 (d, J = 8.0 Hz, 1H), 8.11 (s, 1H), 7.80-7.74 (m, 2H),
7.55-7.51 (m, 1H), 7.34-7.32 (d, J = 8.7 Hz, 2H), 7.04-7.02 (d, J = 8.8 Hz, 2H), 3.86 (s, 3H). 13
C
NMR (100 MHz, CDCl3) δ (ppm) 161.0, 159.9, 147.9, 146.5, 134.5, 130.2, 128.2, 127.6, 127.5,
127.1, 122.4, 114.8, 55.6.
3-[2-(trifluoromethyl)phenyl]-4(3H)-Quinazolinone (2ga):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light yellow solid (37 mg, 64%). m.p. 157-158 ºC . 1H NMR
(400MHz, CDCl3) δ (ppm) 8.36-8.34 (d, J = 7.8 Hz , 1H), 7.98 (s, 1H), 7.90-7.88 (m, 1H),
7.85-7.75 (m, 3H)， 7.70-7.66 (m, 1H), 7.59-7.55 (m, 1H), 7.48-7.46 (d, J = 7.7 Hz , 1H). 13C
NMR (100 MHz, CDCl3) δ (ppm) 160.9, 147.7, 145.6, 135.2, 134.9, 133.5, 131.0, 130.3, 128.6 (q,
J = 31 Hz), 127.9, 127.7 (q, J = 4.4 Hz), 127.7, 127.2, 122.8 (q, J = 272 Hz), 122.1. HRMS (ESI)
m/z calcd for C15H10F3N2O [M+H]+ 291.0745, found 291.0746; IR (film, ν/cm-1): 3015, 1690,
1607, 1317, 1176, 1128, 879, 772.
3-[3-(trifluoromethyl)phenyl]-4(3H)-Quinazolinone (2ha)13:
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Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light yellow solid (47 mg, 81%). m.p. 142-143 ºC . 1H NMR
(400 MHz, CDCl3) δ (ppm) 8.35-8.32 (dd, J1 = 7.2 Hz, J2 = 0.76 Hz, 1H), 8.10 (s, 1H), 7.82-7.63
(m, 6H), 7.57-7.53 (m, 1H). 13C NMR (100 MHz, CDCl3) δ (ppm) 159.5, 146.7, 144.2, 136.9,
133.9, 131.2 (q, J= 33 Hz), 129.5, 129.3, 126.9, 126.7, 126.1, 124.9 (q, J = 3.6 Hz), 123.2 (q, J =
3.7 Hz), 122.3 (q, J = 271 Hz), 121.1.
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3-[4-(trifluoromethyl)phenyl]-4(3H)-Quinazolinone (2ia)14:
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light yellow solid (45 mg, 78%). m.p. 206-207 ºC . 1H NMR
(400 MHz, CDCl3) δ (ppm) 8.35-8.33 (d, J = 7.92 Hz, 1H), 8.11 (s, 1H), 7.83-7.80 (m, 3H),
7.77-7.75 (m, 1 H), 7.61-7.54 (m, 3H). 13C NMR (100 MHz, CDCl3) δ (ppm) 160.5, 147.7, 145.1,
140.4, 134.9, 131.3 (q, J = 33 Hz), 128.0, 127.7, 127.5, 127.2, 126.8 (q, J = 3.7 Hz), 123.6 (q, J =
271 Hz), 122.1.
3-(2-chlorophenyl)-4(3H)-Quinazolinone (2ja):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give yellow solid (32 mg, 63%). m.p. 174-175 ºC . 1H NMR
(400MHz, CDCl3) δ (ppm) 8.38-8.36 (d, J = 7.7 Hz, 1H), 7.99 (s, 1H), 7.85-7.79 (m, 2H),
7.63-7.54 (m, 2H), 7.50-7.44 (m, 3H). 13C NMR (100 MHz, CDCl3) δ (ppm) 160.1, 147.6, 145.9,
134.9, 134.8, 132.4, 131.0, 130.7, 129.8, 128.1, 127.8, 127.5, 127.3, 122.3. HRMS (ESI) m/z
calcd for C14H10ClN2O [M+H]+ 257.0482, found 257.0489; IR (film, ν/cm-1): 3244, 1687, 1608,
1474, 1307, 696, 541.
3-(4-chlorophenyl)-4(3H)-Quinazolinone (2ka)6b:
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Synthesized according to typical procedure and purified by column chromatography (petroleum
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ether : ethyl acetate = 3 : 1) to give white solid (36 mg, 70%). m.p. 188-189 ºC . H NMR
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(400MHz, CDCl3) δ (ppm) 8.35-8.33 (d, J = 8.0 Hz, 1H), 8.08 (s, 1H), 7.82-7.75 (m, 2H),
7.57-7.51 (m, 3H), 7.39-7.37 (d, J = 8.6 Hz, 2H). 13C NMR (100 MHz, CDCl3) δ (ppm) 160.6,
147.7, 145.6, 135.9, 135.2, 134.8, 129.9, 128.3, 127.8, 127.7, 127.2, 122.2.
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3-(3-fluorophenyl)-4(3H)-Quinazolinone (2la):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give white solid (35 mg, 72%). m.p. 158-160 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.36-8.34 (dd, J1 = 7.1 Hz, J2 = 1.0 Hz, 1H), 8.15 (m, 1H), 7.84-7.77 (m,
2H), 7.58-7.50 (m, 2H), 7.24-7.19 (m, 3H). 13C NMR (100 MHz, CDCl3) δ (ppm) 164.1, 161.6,
160.4, 147.3, 145.7, 138.6 (d, J = 10 Hz), 134.9, 131.0 (d, J = 9 Hz), 127.9, 127.3 (d, J = 16 Hz),
122.7 (d, J = 3 Hz), 122.1, 116.4 (d, J = 21 Hz), 114.9(d, J = 24 Hz). HRMS (ESI) m/z calcd for
C14H10FN2O [M+H]+ 241.0777, found 241.0783; IR (film, ν/cm-1): 3065, 1678, 1598, 1455,1398,
1292, 1255, 1166, 863, 825, 764, 448.
3-(4-fluorophenyl)-4(3H)-Quinazolinone (2ma)6b:
Synthesized according to typical procedure and purified by column chromatography (petroleum
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ether : ethyl acetate = 3 : 1) to give white solid (39 mg, 82%). m.p. 164-166 ºC . H NMR
(400MHz, CDCl3) δ (ppm) 8.35-8.33 (d, J = 7.9 Hz, 1H), 8.09 (s, 1H), 7.82-7.74 (m, 2H),
7.56-7.53 (m, 1H), 7.43-7.40 (m, 2H), 7.27-7.21 (m, 2H). 13C NMR (100 MHz, CDCl3) δ (ppm)
162.8, 160.3, 159.8, 146.8, 144.8, 133.7, 132.4 (d, J = 3.1 Hz), 127.9 (d, J = 8.8 Hz), 126.7 (d, J =
15 Hz), 126.1, 121.2, 115.6 (d, J = 23 Hz).
3-[4-(n-butyl)phenyl]-4(3H)-Quinazolinone (2na):
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Synthesized according to typical procedure and purified by column chromatography (petroleum
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ether : ethyl acetate = 3 : 1) to give light yellow solid (41 mg, 73%). m.p. 101-102ºC . H NMR
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(400 MHz, CDCl3) δ (ppm) 8.37-8.35 (d, J = 7.9 Hz, 1H), 8.16 (s, 1H), 7.80-7.77 (m, 2H),
7.56-7.52 (m, 1H), 7.36-7.30 (m, 4H), 2.70-2.67 (t, 2H), 1.68-1.61 (q, 2H), 1.44-1.37 (s, 2H),
0.97-0.93 (t, 3H). 13C NMR (100 MHz, CDCl3) δ (ppm) 159.7, 146.3, 145.4, 143.2, 133.9, 133.6,
128.6, 126.7, 126.2, 125.7, 121.3, 34.3, 32.4, 21.3, 12.9. HRMS (ESI) m/z calcd for C18H18N2ONa
[M+Na]+ 301.1317, found 301.1322; IR (film, ν/cm-1): 2925, 1677, 1601, 1474, 1324, 1287, 1263,
1096, 1022, 798, 772, 477.
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3-[4-(1,1-dimethylethyl)phenyl]-4(3H)-Quinazolinone (2oa):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light red solid (38 mg, 68%). m.p. 120-121 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.34 (s, 1H), 8.22-8.19 (dd, J = 8.0 Hz, J = 1.5 Hz, 1H), 7.90-7.86 (m, 1H),
7.75-7.73 (d, J = 8.1 Hz, 1H), 7.61-7.56 (m, 3H), 7.47-7.45 (m, 2H)，1.34（s, 3H）. 13C NMR (100
MHz, CDCl3) δ (ppm) 160.5, 151.7, 148.2, 147.7, 135.5, 135.1, 127.9, 127.8, 127.4, 126.9, 126.5,
122.4, 34.9, 31.5. HRMS (ESI) m/z calcd for C18H19N2O [M+H]+ 279.1497, found 279.1504; IR
(film, ν/cm-1): 2961, 1686, 1606, 1512, 1469, 1294, 1262, 771.
3-(1-naphthalenyl)-4(3H)-Quinazolinone (2pa):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give yellow solid (34 mg, 63%). m.p. 93-95 ºC . 1H NMR (400 MHz,
CDCl3) δ (ppm) 8.42-8.40 (d, J = 7.9 Hz, 1H), 8.10 (s, 1H), 8.04-8.02 (d, J = 8.2 Hz, 1H),
7.98-7.96 (d, J = 7.9 Hz, 1H), 7.88-7.83 (m, 2H), 7.63-7.50 (m, 6H), 13C NMR (100 MHz, CDCl3)
δ (ppm) 161.1, 148.2, 146.9, 134.8, 134.4, 134.1, 130.3, 129.8, 128.7, 127.8, 127.8, 127.7, 127.3,
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126.9, 126.0, 125.5, 122.4, 122.0. HRMS (ESI) m/z calcd for C18H13N2O [M+H]+ 273.1028,
found 273.1034; IR (film, ν/cm-1): 3475, 2922, 1687, 1604, 1456, 1266, 774, 741, 699, 497.
3-(phenylmethyl)-4(3H)-Quinazolinone (2qa)6b:
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Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light yellow solid (20 mg, 42%). m.p. 117-118 ºC . 1H NMR
(400 MHz, CDCl3) δ (ppm) 8.33-8.31 (d, J = 8.0 Hz, 1H), 8.11 (s, 1H), 7.77-7.69 (m, 2H),
7.52-7.48 (m, 1H), 7.35-7.29 (m, 5H), 5.20 (s, 2H). 13C NMR (100 MHz, CDCl3) δ (ppm) 161.1,
148.0, 146.4, 135.7, 134.3, 129.1, 128.3, 128.0, 127.5, 127.4, 126.9, 122.2, 49.6.
3-(1-methylethyl)-4(3H)-Quinazolinone (2ra)6b:
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light yellow solid (14 mg, 37%). m.p. 98-100 ºC . 1H NMR
(400 MHz, CDCl3) δ (ppm) 8.32-8.30 (d, J = 8.0 Hz, 1H), 8.13 (s, 1H), 7.77-7.69 (m, 2H),
7.52-7.48 (m, 1H), 5.23-5.16 (m, 1H), 1.50-1.49 (d, J = 6.9 Hz, 6H). 13C NMR (100 MHz, CDCl3)
δ (ppm) 160.7, 147.5, 143.6, 134.1, 127.3, 127.2, 126.9, 121.9, 46.0, 21.9.
3-butyl-4(3H)-Quinazolinone (2sa)6b:
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light yellow solid (16 mg, 40%). m.p. 70-72 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.33-8.30 (d, J = 7.9 Hz, 1H), 8.10 (s, 1H), 7.78-7.71 (m, 2H), 7.53-7.49
(m, 1H), 4.03-4.00 (t, 2H), 1.82-1.75 (q, 2H), 1.45-1.39 (s, 2H), 0.99-0.96 (t, 3H). 13C NMR (100
MHz, CDCl3) δ (ppm) 160.9, 147.7, 146.7, 134.2, 127.3, 127.1, 126.7, 122.1, 46.9, 31.4, 19.9,
13.6.
3-cyclohexyl-4(3H)-Quinazolinone (2ta)6b:
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Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light yellow solid (16 mg, 35%). m.p. 118-119ºC . 1H NMR
(400 MHz, CDCl3) δ (ppm) 8.24-8.22 (dd, J1 = 7.1 Hz, J2 = 0.9 Hz, 1H), 8.05 (s, 1H), 7.68-7.60
(m, 2H), 7.42-7.38 (m, 1H), 4.76-4.70 (m, 1H), 1.93-1.84 (m, 4H), 1.72-1.68 (m, 1H), 1.61-1.39
(m, 4H), 1.22-1.15 (m, 1H). 13C NMR (100 MHz, CDCl3) δ (ppm) 159.6, 146.4, 142.9, 133.1,
126.2, 126.1, 125.9, 120.9, 52.3, 31.5, 24.9, 24.3.
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6-methyl-3-phenyl-4(3H)-Quinazolinone (2ab):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give light yellow solid (34 mg, 72%). m.p. 107-108 ºC . 1H NMR
(400 MHz, CDCl3) δ (ppm) 8.15 (s, 1H), 8.08 (s, 1H), 7.68-7.60 (m, 2H), 7.57-7.47 (m, 3H),
7.43-7.41 (m, 2H), 2.51 (s, 3H). 13C NMR (100 MHz, CDCl3) δ (ppm) 160.8, 145.8, 145.4, 138.0,
137.6, 136.0, 129.6, 129.1, 127.4, 127.0, 126.6, 122.1, 21.4. HRMS (ESI) m/z calcd for
C15H13N2O [M+H]+ 237.1028, found 237.1032; IR (film, ν/cm-1): 3282, 3049, 2921, 1687, 1642,
1611, 1547, 1496, 834, 754.
6-methoxy-3-phenyl-4(3H)-Quinazolinone (2ac):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give yellow solid (26 mg, 52%). m.p. 167-168 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.05 (s, 1H), 7.73-7.69 (m, 2H), 7.56-7.54 (m, 3H), 7.44-7.38 (m, 3H), 3.93
(s, 3H). 13C NMR (100 MHz, CDCl3) δ (ppm) 159.6, 158.1, 143.0, 141.2, 136.6, 128.6, 128.1,
128.03, 125.9, 123.7, 122.2, 105.6, 54.9. HRMS (ESI) m/z calcd for C15H13N2O2 [M+H]+
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253.0977, found: 253.0979; IR (film, ν/cm-1): 3333, 3125, 2962, 2926, 1680, 1617, 1552, 1350,
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1025, 802, 751, 568.
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6-fluoro-3-phenyl-4(3H)-Quinazolinone (2ad):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give white solid (33 mg, 69%). m.p. 205-206 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.09 (s, 1H), 8.00-7.98 (m, 1H), 7.80-7.76 (m, 1H), 7.58-7.48 (m, 4H),
7.43-7.41 (d, J = 7.3 Hz, 2H). 13C NMR (100 MHz, CDCl3) δ (ppm) 162.7, 160.2, 160.1 (d, J =
3.3 Hz), 145.4 (d, J = 2 Hz), 144.5, 137.3, 130.0 (d, J = 8 Hz), 129.7, 129.3, 126.9, 123.1 (d, J =
24 Hz), 112.2 (d, J = 23 Hz); HRMS (ESI) m/z calcd for C14H10FN2O [M+H]+ 241.0777, found
241.0778; IR (film, ν/cm-1): 3113, 3053, 3029, 2916, 2853, 1594, 1483, 1284, 647, 500, 422.
6-chloro-3-phenyl-4(3H)-Quinazolinone (2ae):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give yellow solid (35 mg, 68%). m.p. 190-191 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 8.32 (s, 1H), 8.12 (s, 1H), 7.73-7.70 (m, 2H), 7.58-7.48 (m, 3H), 7.43-7.40
(m, 2H). 13C NMR (100 MHz, CDCl3) δ (ppm) 159.7, 146.4, 146.3, 137.2, 135.0, 133.6, 129.8,
129.3, 129.3, 126.9, 126.6, 123.5. HRMS (ESI) m/z calcd for C14H10ClN2O [M+H]+ 257.0482,
found 257.0482; IR (film, ν/cm-1): 3043, 2920, 1677, 1611, 1592,1472, 1180, 832, 766, 644, 622.
6-bromo-3-phenyl-4(3H)-Quinazolinone (2af):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give white solid (45 mg, 75%). m.p. 185-186 ºC . 1H NMR (400
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MHz, CDCl3) δ (ppm) 8.486-8.480 (d, J = 2.3 Hz, 1H), 8.12 (s, 1H), 7.89-7.86 (dd, J1 = 8.6 Hz, J2
= 2.3 Hz, 1H), 7.65-7.63(d, J = 8.6 Hz, 2H), 7.58-7.48 (m, 3H), 7.42-7.40 (d, J = 7.6 Hz, 2H). 13C
NMR (100 MHz, CDCl3) δ (ppm) 159.6, 146.7, 146.4, 137.8, 137.2, 129.8, 129.7, 129.4, 129.3,
126.9, 123.8, 121.3. HRMS (ESI) m/z calcd for C14H10BrN2O [M+H]+ 300.9977, found 300.9977;
IR (film, ν/cm-1): 3061, 2922, 1679, 1591, 1508, 1267, 875, 749, 611, 486.
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6-nitro-3-phenyl-4(3H)-Quinazolinone (2ag):
Synthesized according to typical procedure and purified by column chromatography (petroleum
ether : ethyl acetate = 3 : 1) to give yellow solid (35 mg, 65%). m.p. 223-224 ºC . 1H NMR (400
MHz, CDCl3) δ (ppm) 9.22-9.21 (d, J = 2.6 Hz, 1H), 8.60-8.57 (dd, J1 = 8.9 Hz, J2 = 2.6 Hz, 1H),
8.26 (s, 1H), 7.92-7.89 (d, J = 8.9 Hz, 1H), 7.61-7.52 (m, 3H), 7.45-7.42 (m, 2H). 13C NMR (100
MHz, CDCl3) δ (ppm) 159.6, 151.9, 148.9, 146.4, 136.7, 129.9, 129.7, 129.4, 128.7, 126.8, 123.8,
122.8. HRMS (ESI) m/z calcd for C14H10N3O3 [M+H]+ 268.0722, found 268.0727; IR (film,
ν/cm-1): 3023, 1743, 1683, 1615, 1568, 1398, 1273, 1098, 913, 849, 749, 547, 467.
ASSOCIATED CONTENT
Supporting Information
1H NMR and 13C NMR spectra for all the products. This material is available free of charge via
the Internet at http://pubs.acs.org.
AUTHOR INFORMATION
Corresponding Author
Fax: 86-551-3631760. E-mail: zwang3@ustc.edu.cn
Notes
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The authors declare no competing financial interest.
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ACKNOWLEDGMENTS：
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We are grateful to National Nature Science Foundation of China(2127222, 91213303, 21172205,
J1030412).
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