Synthesis of (Het)aryl 2-(2-hydroxyaryl)cyclopropyl ketones

Article abstract of DOI:10.3390/molecules25235748

A simple general method for the synthesis of 1-acyl-2-(ortho-hydroxyaryl)cyclopropanes, which belong to the donor–acceptor cyclopropane family, has been developed. This method, based on the Corey–Chaykovsky cyclopropanation of 2-hydroxychalcones, allows f

Full text of DOI:10.3390/molecules25235748

molecules
Communication
Synthesis of (Het)aryl 2-(2-
hydroxyaryl)cyclopropyl Ketones
Alexander A. Fadeev 1,2, Alexey O. Chagarovskiy 3,4, Anton S. Makarov 2, Irina I. Levina 5,
Olga A. Ivanova 3,6 , Maxim G. Uchuskin 2,
*
and Igor V. Trushkov 3,4,
*
1
Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8,
12800 Prague 2, Czech Republic; fadeeva@natur.cuni.cz
2
3
Department of Chemistry, Perm State University, Bukireva 15, Perm 614990, Russia; antony.s.makarov@psu.ru
N. D. Zelinsky Institute of Organic Chemistry, Leninsky pr. 47, Moscow 119991, Russia;
alex.chagarovskiy@gmail.com (A.O.C.); iv@kinet.chem.msu.ru (O.A.I.)
Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology,
Samory Mashela 1, Moscow 117997, Russia
N. M. Emanuel Institute of Biochemical Physcis Russian Academy of Sciences, Kosygina 4,
Moscow 117198, Russia; iilevina@inbox.ru
Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie gory 1-3,
Moscow 119991, Russia
4
5
6
*
Correspondence: mu@psu.ru (M.G.U.); trush@ioc.ac.ru (I.V.T.); Tel.: +7-916-645-9951 (I.V.T.)
ꢀꢁꢂꢀꢃꢄꢅꢆꢇ
Academic Editors: Ivan Gitsov and Rafał Loska
Received: 21 November 2020; Accepted: 4 December 2020; Published: 5 December 2020
ꢀꢁꢂꢃꢄꢅꢆ
Abstract: A simple general method for the synthesis of 1-acyl-2-(ortho-hydroxyaryl)cyclopropanes,
which belong to the donor–acceptor cyclopropane family, has been developed. This method, based on
the Corey–Chaykovsky cyclopropanation of 2-hydroxychalcones, allows for the preparation of a large
diversity of hydroxy-substituted cyclopropanes, which can serve as promising building blocks for the
synthesis of various bioactive compounds.
Keywords: 2-hydroxychalcones; Corey–Chaykovsky cyclopropanation; donor–acceptor cyclopropanes
1. Introduction
During last decades donor–acceptor (D–A) cyclopropanes [
of organic chemists due to the excellent combination of their availability and high reactivity toward
diverse classes of reaction partners: nucleophiles [ 10], electrophiles [11 12], radicals [13 14],
dipolarophiles [15 22], dipoles [23 25], 1,3-dienes [26 28], etc. (Scheme 1a). In these reactions D–A
1–6] attracted a significant attention
4,
7–
,
,
–
–
–
cyclopropanes serve typically as synthetic equivalents of 1,3-dipoles providing approach to compounds,
which are not easily accessible by other methods. In addition, D–A cyclopropanes can isomerize
to alkenes conjugated to either electron-releasing [29
and exhibit reactivity of substituted styrenes (or their heterocyclic analogues) [31,34–38] or Michael
acceptors [39 45], respectively (Scheme 1b). Moreover, D–A cyclopropanes can provide their
acceptor [4,46–48] or donor [ 40 42 49] substituents for new bond formations. Among others,
–31] or electron-withdrawing groups [29,32,33]
–
5
, , ,
D–A cyclopropanes, bearing the hydroxy group at the ortho-position of a donor aromatic
substituent, are especially interesting. Such cyclopropanes were shown to react as equivalents
of o-quinone methide with alkenes affording chromane derivatives [50], undergo rearrangement to
2,3-dihydrobenzofurans [41], and participate in other transformations [50–52], including preparation
of pharmacological agents (Scheme 1c) [53]. Furthermore, 2-hydroxyaryl-derived D–A cyclopropanes
demonstrated bioactivity themselves, being selective antagonists of orexin 2 receptors [54] and showing
antimicrobial and nematicidal activity [55].
Molecules 2020, 25, 5748; doi:10.3390/molecules25235748
www.mdpi.com/journal/molecules

Molecules 2020, 25, 5748
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Scheme 1.
(a,b)ExamplesofreactivityofD–Acyclopropanes; (c)selectedreactionsof2-hydroxyaryl-derived
D–A cyclopropanes.
Despite the promising reactivity and bioactivity of 2-hydroxyaryl-substituted cyclopropanes,
their investigation is restricted by the absence of simple and efficient methods for their synthesis.
In particular, the preparation of the corresponding cyclopropane-1,1-diesters requires protection
of the phenolic oxygen [41
2-hydroxychalcones produced a variety of products [56
highly activating effect of ortho-hydroxy group [50 60] on three-membered ring opening as well
,
50], while the Corey–Chaykovsky cyclopropanation of easily available
–
60]. This presumably resulted from the
,
as the possible involvement of the nucleophilic phenoxy moiety into diverse transformations of
2-hydroxyaryl-derived D–A cyclopropanes. We report here the efficient procedure for the preparation
of 1-acyl-2-(2-hydroxyaryl)cyclopropanes as potent bioactive compounds and promising building
blocks for the synthesis of various acyclic, alicyclic and heterocyclic compounds.
2. Results and Discussion
We investigated the reaction of trimethylsulfoxonium iodide with 2-hydroxychalcone 1a as a
model substrate. Varying base, solvent, temperature, ratio of the reacting compounds and order
of their additiion, we found that cyclopropane 2a can be obtained in 70% yield, when the solution
of trimethylsulfoxonium iodide in DMSO/THF mixture was treated with 3 equivalents of sodium
hydride followed by addition of enone 1a to the formed reaction mixture at
10 ◦C and stirring for 3 h
−
(Scheme 2).
Scheme 2. Corey–Chaykovsky cyclopropanation of 2-hydroxychalcone 1a.
The control of temperature and quenching procedure were found to be important for the good
yield of the target product. Thus, the yield dropped significantly, if sodium hydride was added to the
ice-cooled solution of starting compounds followed by removal of cooling bath. Moreover, compound
2a was formed in trace amounts only, when all steps of process occurred at room temperature,
the reaction being performed in DMF. Nevertheless, when addition of 1a to the preformed ylide and
stirring the reaction mixture were performed at 0 ◦C, product 2a was obtained with acceptable yield.

Molecules 2020, 25, 5748
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Quenching of the highly basic reaction mixture with ammonium chloride afforded 2a in a good yield,
while only trace amounts of cyclopropane 2a was obtained when acetic acid was used for quenching.
With the optimized reaction conditions in hand, we synthesized a series of 2-hydroxychalcone
derivatives (see Experimental part) and studied the scope of Corey–Chaykovsky cyclopropanation
of these substrates. We found that diverse substituents in the phenolic moiety (alkoxy, halogens,
nitro group) were tolerant to the reaction conditions, and the corresponding cyclopropanes
2 were
obtained in reasonable to high yields (Scheme 3). Electron-releasing substituents in the aroyl fragment
have also no significant effect on the reaction yield. Oppositely, enones
1 with electron-depleted aroyl
group, such as nicotinoyl or 40-nitrobenzoyl, failed to produce the desired cyclopropane
processes realization.
2 due to side
Scheme 3. Synthesis of donor–acceptor (D–A) cyclopropanes 2.
Earlier it was pointed out that Corey–Chaykovsky cyclopropanation of the related enones
proceeds typically with the retention of stereochemistry [61 62]. Indeed, all products were obtained as
,
single diasteromers; trans-arrangement of donor and acceptor substituents in cyclopropane 2e was
unambiguously proved by single-crystal X-ray analysis (Figure 1). Crystal data for compound
2e (C17H15BrO3, M = 347.20 g/mol): Orthorhombic, space group Pbca (no. 61), a = 9.4040(2) Å,
b = 11.8308(3) Å, c = 27.0748(6) Å,
α
= 90◦,
β
= 90◦,
γ
= 90◦, V = 3012.26(12) Å3, Z = 8, T = 100(2) K
< 37.788),
(I))
,
µ
(Mo K Θ
α
) = 2.736 mm−1, Dcalc = 1.531 g/cm3, 92,781 reflections measured (2.637 <
8080 unique (R(int) = 0.0454) which were used in all calculations. The final R1 was 0.03225 (I > 2
σ
and ωR2 was 0.0857 (all data).
Similar values of coupling constants for protons of three-membered rings support the conclusion
that all synthesized cyclopropanes have the same relative configuration of two stereocenters. It is
2
noteworthy that C(1)–C(2) bond length in 2e (1.536 Å) is significantly larger than the bond length in
the unsubstituted cyclopropane (1.510 Å, [63]). This bond elongation results from the significant
polarization of the C(1)–C(2) bond due to the cooperative effect of donor and acceptor substituents at
the vicinal atoms of three-membered ring. On the other hand, this bond is significantly shorter than
the corresponding bond in dimethyl 2-(5-bromo-2-hydroxyphenyl)cyclopropane-1,1-dicarboxylate
(1.558 Å, [50]). This allows to suppose the lower reactivity of 2e bearing 4-methoxybenzoyl group as
an acceptor in comparison with the aforementioned diester.

Molecules 2020, 25, 5748
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Figure 1. Single-crystal X-ray data for compound 2e (CCDC 2042862).
3. Materials and Methods
3.1. General Information
The structures of synthesized compounds were elucidated with the aid of 1D (1H, 13C) and 2D
(HSQC, NOESY) NMR spectroscopy. NMR spectra were acquired on Avance 500 and Avance 400
(Bruker, Billerica, MA, USA) spectrometers at room temperature; the chemical shifts
ppm with respect to solvent (1H: CDCl3, = 2.50 ppm; 13C: CDCl3, δ = 77.16
= 7.26 ppm, DMSO-d6,
DMSO-d6, = 39.52 ppm). Splitting patterns are designated as s, singlet; d, doublet; m, multiplet;
dd, double doublet; br., broad. Coupling constants (J) are in Hertz. 19F NMR spectra were recorded at
471 MHz with fluorobenzene as an external reference ( 113.1 in DMSO-d6). Infrared spectra were
δ were measured in
δ
δ
;
δ
δ
=
−
recorded on an FTIR spectrometer ALPHA II (Bruker, Billerica, MA, USA) in KBr for solid substances
and in nujol for oils. High resolution and accurate mass measurements were carried out using a
micrOTOF-QTM ESI-TOF (Electrospray Ionization/Time of Flight, Bruker, Billerica, MA, USA) using ESI
modes. X-Ray diffraction data were collected at 100 K on a Quest D8 diffractometer (Bruker, Billerica,
MA, USA) equipped with a Photon-III area-detector (graphite monochromator, shutterless
ϕ- and
ω
-scan technique) using Mo Kα-radiation. Elemental analyses were performed with an EA-1108 CHNS
elemental analyser instrument (Fisons, Ipswich, UK). Melting points (mp) are uncorrected and were
measured on a 9100 capillary melting point apparatus (Electrothermal, Stone, UK). Analytical thin
layer chromatography (TLC) was done on silica gel plates (silica gel 60, F254, supported on aluminium);
visualization was done using a UV lamp (365 and 254 nm). Column chromatography was performed
on silica gel 60 (230–400 mesh, Merck, Darmstadt, Germany). All reactions were performed using
freshly distilled and dry solvents. Compound 1a and other commercial reagents employed in the
synthesis were analytical grade, obtained from Aldrich (St. Louis, MI, USA) or Alfa Aesar (Ward Hill,
MO, USA). The NMR spectra for new compounds are available in the Supplementary Materials.
3.2. General Procedure for the Synthesis of 2-Hydroxychalcones 1
To a solution of aryl methyl ketone (4–10 mmol, 1 equiv) and (substituted) salicylaldehyde
(4–10 mmol, 1 equiv), in EtOH (5–12 mL) was added 40% aq. NaOH (0.6–1.5 mL, 2.5 equiv) and the
mixture was stirred at room temperature (or elevated temperature, if precipitation of intermediates
occurred after addition of NaOH) for 12–48 h until the disappearance of starting material (monitored by
thin layer chromatography). The reaction was poured into cold water (100–250 mL) and the mixture
was neutralized with 2 M HCl to neutral or slightly acidic pH. The resulting precipitate was filtered,
washed with water and air dried to afford the desired product. Crude product can be purified by
recrystallization from appropriate solvent.
(E)-3-(2-Hydroxyphenyl)-1-(4-methoxyphenyl)prop-2-en-1-one (1b). Salicylaldehyde (1.22 g, 10.0 mmol),
◦
4-methoxyacetophenone (1.50 g, 10.0 mmol), NaOH (1.00 g, 25.0 mmol), water (1.5 mL) 50 C, 12 h.
Yield 2.09 g (84%); light-yellow solid; mp = 147–148 ◦C (lit. 151–153 ◦C [64]; 148–149 ◦C [65]). Spectral data
are consistent with the reported ones [64,65].

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(E)-3-(2-Hydroxyphenyl)-1-(2-thienyl)prop-2-en-1-one (1c). Salicylaldehyde (611 mg, 5.0 mmol),
2-acetylthiophene (631 mg, 5.0 mmol), ethanol (6 mL), NaOH (500 mg, 12.5 mmol), water (0.75 mL),
rt, 24 h. Yield 610 mg (53%); yellow solid; mp = 164–165 ◦C (lit. 165–168 ◦C [66], 158–159 ◦C [65]).
Spectral data are consistent with the reported ones [65,66].
(E)-3-(5-Fluoro-2-hydroxyphenyl)-1-(4-methoxyphenyl)prop-2-en-1-one (1d). 5-Fluorosalicylaldehyde
(561 mg, 4.0 mmol), 4-methoxyacetophenone (600 mg, 4.0 mmol), ethanol (5 mL), NaOH (400 mg,
10.0 mmol), water (0.6 mL), rt, 30 h. Yield 825 mg (76%); beige solid; mp = 161 ◦C (dec.).
1H-NMR (DMSO-d6, 500 MHz) = 3.86 (s, 3H, CH3O), 6.92–6.95 (m, 1H, Ar), 7.07 (d, 3J = 8.9 Hz, 2H,
δ
Ar), 7.08–7.13 (m, 1H, Ar), 7.80–7.82 (m, 1H, Ar), 7.92 (d, 3J = 15.7 Hz, 1H, HC=), 8.01 (d, 3J = 15.7 Hz
,
1H, HC=), 8.14 (d, 3J = 8.9 Hz, 2H, Ar), 10.23 (br.s, 1H, OH). 13C NMR (DMSO-d6, 126 MHz) δ = 55.5
(CH3), 113.5 (d, 2JC–F = 24 Hz, CH), 114.0 (2
×
CH), 117.3 (d, 3JC–F = 8 Hz, CH), 118.3 (d, 2JC–F = 24 Hz
CH), 137.2 (CH), 153.4 (C),
125.0. IR (cm−1
,
3
CH), 122.0 (CH), 122.5 (d, JC–F = 8 Hz, C), 130.6 (CH), 130.9 (2
×
155.6 (d, 1JC–F = 233 Hz, C), 163.2 (C), 187.5 (CO). 19F NMR (DMSO-d6, 471 MHz)
δ
=
−
)
3280, 1650, 1600, 1585, 1560, 1515, 1420, 1370, 1320, 1265, 1245, 1175, 1025, 975, 835. HRMS ESI-TOF:
m/z 273.0927 [M + H]+ (273.0921 calcd for C16H14FO3+). Anal. calcd. for C16H13FO3: C, 70.58; H, 4.81.
Found: C, 70.56; H, 4.64.
(E)-3-(5-Bromo-2-hydroxyphenyl)-1-(4-methoxyphenyl)prop-2-en-1-one (1e). 5-Bromosalicylaldehyde (1.61 g,
8.0 mmol), 4-methoxyacetophenone (1.20 g, 8.0 mmol), ethanol (10 mL), NaOH (800 mg, 20.0 mmol),
water (1.2 mL), rt, 24 h. Yield 2.24 mg (84%); bright yellow solid; mp = 174–175 ◦C (dec.) (lit. 177.0–177.3
◦C [67]). Spectral data are consistent with the reported ones [67].
(E)-3-(2-Hydroxy-5-nitrophenyl)-1-(4-methoxyphenyl)prop-2-en-1-one (1f). 5-Nitrosalicylaldehyde (668 mg,
4.0 mmol), 4-methoxyacetophenone (600 mg, 4.0 mmol), ethanol (7.5 mL), NaOH (400 ◦mg, 10.0
◦
mmol), water (0.6 mL), 50 C, 12 h. Yield 822 mg (69%); brick-red solid; mp = 215–216 C (dec.).
1H NMR (DMSO-d6, 500 MHz)
δ
= 3.86 (s, 3H, CH3O), 6.55–6.57 (m, 1H, Ar), 7.07 (d, 3J = 8.9 Hz, 2H, Ar),
7.91 (d, 3J = 15.6 Hz, 1H, HC=), 7.91–7.94 (m, 1H, Ar), 8.11 (d, 3J = 8.9 Hz, 2H, Ar), 8.19 (d, 3J = 15.6 Hz
1H, HC=), 8.48–8.51 (m, 3H, Ar). 13C NMR (DMSO-d6, 126 MHz)
= 55.5 (CH3), 113.9 (2 CH),
119.8 (CH), 120.1 (CH), 122.1 (CH), 127.1 (CH), 127.3 (CH), 130.6 (2 CH), 131.1 (C), 133.4 (C), 140.4 (CH),
162.9 (C), 163.9 (C), 173.1 (C), 188.0 (CO). IR (cm−1) 3490, 3080, 1650, 1605, 1500, 1340, 1305, 1265,
1255, 1220, 1170, 1160, 1025, 835, 745. HRMS ESI-TOF: m/z 300.0871 [M + H]+ (300.0866 calcd for
C16H14NO5+).
,
δ
×
×
(E)-3-(5-Fluoro-2-hydroxyphenyl)-1-phenylprop-2-en-1-one (1g).
5-Fluorosalicylaldehyde (700 mg,
5.0 mmol), acetophenone (600 mg, 5.0 mmol), ethanol (6 mL), NaOH (500 mg, 12.5 mmol),
1
water (0.75 mL), rt, 30 h. Yield 913 mg (75%); bright yellow solid; mp = 163 ◦C (dec). H NMR (DMSO-d6,
500 MHz)
δ = 6.93–6.96 (m, 1H, Ar), 7.11–7.15 (m, 1H, Ar), 7.55–7.58 (m, 2H, Ar), 7.65–7.67 (m, 1H,
Ar), 7.81–7.83 (m, 1H, Ar), 7.92 (d, 3J = 15.7 Hz, 1H, HC=), 8.03 (d, 3J = 15.7 Hz, 1H, HC=), 8.14–8.15
(m, 2H, Ar), 10.26 (br.s, 1H, OH). 13C NMR (DMSO-d6, 126 MHz)
δ
= 113.6 (d, JC–F = 24 Hz,
2
CH), 117.3 (d, 3JC–F = 8 Hz, CH), 118.6 (d, 2JC–F = 24 Hz, CH), 122.0 (CH), 122.3 (d, 3JC–F = 8 Hz, C),
128.5 (2 × CH), 128.8 (2
CH), 133.1 (CH), 137.7 (C), 138.1 (CH), 153.6 (C), 155.5 (d, 1JC–F = 234 Hz, C),
189.3 (CO). 19F NMR (DMSO-d6, 471 MHz)
×
δ
=
125.0. IR (cm−1) 3365, 1655, 1600, 1585, 1570, 1500,
−
1450, 1350, 1280, 1245, 1210, 1180, 1155, 1020, 990, 850, 820, 720. HRMS ESI-TOF: m/z 243.0823 [M + H]+
(243.0816 calcd for C15H12FO2+).
(E)-3-(5-Bromo-2-hydroxyphenyl)-1-phenylprop-2-en-1-one (1h). 5-Bromosalicylaldehyde (1.61 g, 8.0 mmol),
acetophenone (961 mg, 8.0 mmol), ethanol (10 mL), NaOH (800 mg, 20.0 mmol), water (1.2 mL), rt, 24
h. Yield 1.95 g (80%); bright yellow solid; mp = 162–163 ◦C (lit. 163.7–164.2 ◦C [67]). Spectral data are
consistent with the reported ones [67,68].
(E)-3-(2-Hydroxy-5-nitrophenyl)-1-phenylprop-2-en-1-one (1i). 5-Nitrosalicylaldehyde (1.67 g, 10.◦0 mmol),
acetophenone (1.2 g, 10.0 mmol), 20% aq. NaOH (5.5 mL, 27.5 mmol), EtOH (7 mL), 50 C, 24 h.
Yield 99 mg (70%); pale yellow solid; mp = 217–218 ◦C (ethyl acetate). Spectral data are consistent with
the reported ones [68].

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(E)-3-(5-Fluoro-2-hydroxyphenyl)-1-(2-thienyl)prop-2-en-1-one (1j). 5-Fluorosalicyl aldehyde (701 mg,
5.0 mmol), 2-acetylthiophene (631 mg, 5.0 mmol), ethanol (6 mL), NaOH (500 mg, 12.5 mmol),
1
water (0.75 mL), rt, 24 h. Yield 829 mg (67%); bright yellow solid; mp = 158 ◦C (dec.). H NMR (DMSO-d6,
500 MHz)
δ = 6.93–6.96 (m, 1H, Ar), 7.10–7.14 (m, 1H, Ar), 7.29–7.31 (m, 1H, Ar), 7.80–7.82 (m, 1H, Ar),
7.86 (d, 3J = 15.7 Hz, 1H, HC=), 8.00–8.04 (m, 2H, Ar + HC=), 8.29–8.30 (m, 1H, Ar), 10.19 (br.s, 1H,
OH). 13C NMR (DMSO-d6, 126 MHz)
δ 113.5 (d, JC–F = 24 Hz, CH), 117.4 (d, JC–F = 8 Hz, CH),
2
3
118.7 (d, 2JC–F = 24 Hz, CH), 121.8 (CH), 122.2 (d, 3JC–F = 8 Hz, C), 128.9 (CH), 133.5 (CH), 135.4 (CH),
137.2 (CH), 145.7 (C), 153.7 (C), 155.6 (d, 1JC–F = 234 Hz, C), 181.7 (CO). 19F NMR (DMSO-d6, 471 MHz)
δ
=
124.9. IR (cm−1) 3230, 3115, 1635, 1570, 1505, 1440, 1415, 1355, 1280, 1245, 1180, 1150, 990, 840, 720.
−
HRMS ESI-TOF: m/z 249.0383 [M + H]+ (249.0380 calcd for C13H10FO2S+).
(E)-3-(5-Chloro-2-hydroxyphenyl)-1-(2-thienyl)prop-2-en-1-one (1k). 5-Chlorosalicylaldehyde (626 mg,
4.0 mmol), 2-acetylthiophene (505 mg, 4.0 mmol), ethanol (5 mL), NaOH (400 mg, 10.0 mmol),
water (0.6 mL), rt, 24 h. Yield 652 mg (62%); dark yellow solid; mp = 159–160 ◦C (dec.) (lit. 185–187 ◦C
1
(AcOH) [69]). H NMR (DMSO-d6, 500 MHz)
δ
= 6.96 (d, 3J = 8.5 Hz, 1H, Ar), 7.29 (dd, 3J = 8.5 Hz,
4J = 2.6 Hz, 1H, Ar), 7.31 (dd, J = 5.0 Hz, J = 3.6 Hz, 1H, Th), 7.88 (d, J = 15.7 Hz, 1H, HC=),
7.98 (d, 3J = 15.7 Hz, 1H, HC=), 8.02 (d, J = 2.6 Hz, 1H, Ar), 8.04 (dd, J = 5.0 Hz, J = 0.8 Hz,
3
3
3
4
3
4
1H, Th), 8.33 (dd, J = 3.6 Hz, J = 0.8 Hz, 1H, Th), 10.59 (br.s, 1H, OH). 13C NMR (DMSO-d6,
126 MHz) δ = 117.9 (CH), 121.8 (CH), 122.9 (C), 123.3 (C), 127.3 (CH), 128.8 (CH), 131.4 (CH), 133.5 (CH),
135.3 (CH), 136.7 (CH), 145.6 (C), 155.9 (C), 181.7 (CO). IR (cm−1) 3235, 1640, 1565, 1515, 1490, 1415,
1340, 1285, 1235, 1170, 1115, 1065, 985, 845, 730. HRMS ESI-TOF: m/z 265.0083 [M + H]+ (265.0085 calcd
for C13H10ClO2S+). Anal. calcd. for C13H9ClO2S: C, 58.98; H, 3.43. Found: C, 58.92; H, 3.35.
(E)-3-(5-Bromo-2-hydroxyphenyl)-1-(2-thienyl)prop-2-en-1-one (1l). 5-Bromosalicylaldehyde (1.61 g,
8.0 mmol), 2-acetylthiophene (1.01 g, 8.0 mmol), NaOH (800 mg, 20.0 mmol), ethanol (10 mL),
3
4
water (1.2 mL), 50 ◦C, 12 h. Yield 2.21 g (89%); yellow solid; mp = 153–154 ◦C (dec.). H NMR (DMSO-d6,
1
500 MHz)
δ ,
= 6.91 (dd, 3J = 8.7 Hz, 4J = 1.4 Hz, 1H, Ar), 7.32 (ddd, 3J = 3.8 Hz, 3J = 5.0 Hz, 4J = 1.7 Hz
3
4
3
4
1H, Th), 7.40 (dd, J = 5.0 Hz, J = 1.7 Hz, 1H, Th), 7.88 (dd, J = 15.7 Hz, J = 1.4 Hz, 1H, HC=),
7.99 (d, 3J = 15.7 Hz, 1H, HC=), 8.03–8.04 (m, 1H, Ar), 8.13–8.14 (m, 1H, Ar), 8.33–8.34 (m, 1H, Ar),
10.61 (br.s, 1H, OH). 13C NMR (DMSO-d6, 126 MHz)
δ = 110.9 (C), 118.4 (CH), 121.8 (CH), 123.5 (C),
128.9 (CH), 130.2 (CH), 133.7 (CH), 134.3 (CH), 135.4 (CH), 136.6 (CH), 145.7 (C), 156.4 (C), 181.7 (CO).
IR (cm−1) 3250, 3100, 1640, 1580, 1470, 1410, 1355, 1310, 1265, 1240, 1210, 1170, 1065, 995, 780, 720.
HRMS ESI-TOF: m/z 332.9390 [M + Na]+ (332.9378 calcd for C13H981BrO2SNa+). Anal. calcd. for
C13H9BrO2S: C, 50.50; H, 2.93. Found: C, 50.18; H, 2.70.
(E)-3-(2-Hydroxy-5-nitrophenyl)-1-(2-thienyl)prop-2-en-1-one (1m). 5-Nitrosalicyl aldehyde (668 mg,
4.0 mmol), 2-acetylthiophene (505 mg, 4.0 mmol), ethanol (7.5 mL), NaOH (400 mg, 10.0 mmol),
water (0.6 mL), 50 ◦C, 12 h. Yield 717 mg (65%); pale orange solid; mp = 205 ◦C (dec.).
3
3
1H NMR (DMSO-d6, 500 MHz)
δ ,
= 7.10 (d, J = 9.0 Hz, 1H, Ar), 7.32 (dd, J = 3.8 Hz, 3J = 4.9 Hz
3
3
3
1H, Th), 7.97 (d, J = 15.7 Hz, 1H, HC=), 8.03 (d, J = 15.7 Hz, 1H, HC=), 8.07 (d, J = 4.9 Hz, 1H,
Th), 8.16 (dd, J = 9.0 Hz, J = 2.8 Hz, 1H, Ar), 8.38 (d, J = 3.8 Hz, 1H, Th), 8.81 (d, J = 2.8 Hz,
1H, Ar), 11.89 (br.s, 1H, OH). 13C NMR (DMSO-d6, 126 MHz)
3
4
3
4
δ
= 116.6 (CH), 121.9 (C), 123.4 (CH),
124.4 (CH), 127.2 (CH), 128.9 (CH), 134.0 (CH), 135.7 (CH), 136.0 (CH), 140.0 (C), 145.4 (C), 162.7 (C),
181.6 (CO). IR (cm−1) 3220, 3110, 1640, 1615, 1565, 1520, 1490, 1410, 1355, 1340, 1305, 1290, 1100, 980,
845, 740. HRMS ESI-TOF: m/z 276.0326 [M + H]+ (276.0325 calcd for C13H10NO4S+). Anal. calcd. for
C13H9NO4S: C, 56.72; H, 3.30; N, 5.09. Found: C, 56.51; H, 3.25; N, 4.94.
(E)-3-(2-Hydroxy-3-methoxyphenyl)-1-phenylprop-2-en-1-one (1n). 3-Methoxysalicyl aldehyde (1.520 g,
10.0 mmol), acetophenone (1.20 g, 10.0 mmol), ethanol (12.0 mL), NaOH (1.00 g, 25.0 mmol),
◦
◦
water (1.5 mL), 50 C, 12 h. Yield 1.67 g (66%); yellow solid; mp = 110–112 C (lit. 109–111
◦C [70]; 115 ◦C [71]). Spectral data are consistent with the reported ones [68,70,71].
(E)-3-(3-Ethoxy-2-hydroxyphenyl)-1-phenylprop-2-en-1-one (1o).
3-Ethoxysalicylaldehyde (1.66 g,
10.0 mmol), acetophenone (1.20 g, 10.0 mmol), ethanol (12.0 mL), NaOH (1.00 g, 25.0 mmol),
1
water (1.5 mL), rt, 48 h. Yield 1.72 g (64%); dark yellow solid; mp = 172–173 ◦C (dec.). H NMR (DMSO-d6,

Molecules 2020, 25, 5748
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500 MHz) δ
= 1.36 (t, 3J = 7.0 Hz, 3H, CH3), 4.06 (q, 3J = 7.0 Hz, 2H, CH2), 6.81–6.84 (m, 1H, Ar), 7.00–7.02
(m, 1H, Ar), 7.47–7.49 (m, 1H, Ar), 7.55–7.58 (m, 2H, Ar), 7.63–7.66 (m, 1H, Ar), 7.85 (d, 3J = 15.7 Hz
,
3
1H, HC=), 8.10–8.12 (m, 2H, Ar), 8.13 (d, J = 15.7 Hz, 1H, HC=), 9.26 (br.s, 1H, OH). 13C NMR
(DMSO-d6, 126 MHz)
δ = 14.6 (CH3), 64.3 (CH2), 114.8 (CH), 119.1 (CH), 119.7 (CH), 121.8 (CH),
121.6 (C), 128.3 (2 CH), 128.7 (2
×
×
CH), 132.8 (CH), 137.8 (C), 139.3 (CH), 146.8 (C), 147.0 (C), 189.5 (CO).
IR (cm−1) 3365, 2980, 1655, 1585, 1470, 1310, 1265, 1235, 1210, 1170, 1065, 1000, 850, 765. HRMS ESI-TOF:
m/z 291.0991 [M + Na]+ (291.0992 calcd for C17H16O3Na+).
(E)-3-(3-Ethoxy-2-hydroxyphenyl)-1-(2-thienyl)prop-2-en-1-one (1p). 3-Ethoxysalicylaldehyde (1.66 g,
10.0 mmol), 2-acetylthiophene (1.26 g, 10.0 mmol), ethanol (12.0 mL), NaOH (1.00 g, 25.0 mmol),
◦
water (1.5 mL), rt, 48 h. Yield 1.86 mg (68%); brownish yellow solid; mp = 168–169 C (dec.).
1H NMR (DMSO-d6, 500 MHz)
δ
= 1.36 (t, 3J = 7.0 Hz, 3H, CH3), 4.06 (q, 3J = 7.0 Hz, 2H, CH2), 6.80–6.84
(m, 1H, Ar), 7.00–7.01 (m, 1H, Ar), 7.29–7.31 (m, 1H, Ar), 7.48–7.50 (m, 1H, Ar), 7.78 (d, 3J = 15.7 Hz
1H, HC=), 8.02–8.03 (m, 1H, Ar), 8.13 (d, 3J = 15.7 Hz, 1H, HC=), 8.23–8.24 (m, 1H, Ar). 13C NMR
(DMSO-d6, 126 MHz) = 14.6 (CH3), 64.3 (CH2), 114.8 (CH), 119.1 (CH), 119.7 (CH), 120.8 (CH),
,
δ
121.6 (C), 128.9 (CH), 133.1 (CH), 135.1 (CH), 138.4 (C), 145.7 (C), 147.2 (C), 181.8 (CO). IR (cm−1) 3310,
2980, 1640, 1580, 1470, 1410, 1355, 1310, 1265, 1240, 1210, 1170, 1065, 995, 780, 720. HRMS ESI-TOF:
m/z 275.0738 [M + H]+ (275.0736 calcd for C15H15O3S+). Anal. calcd. for C15H14O3S: C, 65.67; H, 5.14.
Found: C, 65.54; H, 4.97.
3.3. General Procedure for the Synthesis of Donor–Acceptor Cyclopropanes 2
Trimethylsulfoxonium iodide (242 mg, 1.1 mmol) was dissolved in ice-cooled mixture of
THF/DMSO (1:1, 10 mL) and 60% suspension of sodium hydride in mineral oil (120 mg, 3 mmol)
was added. The mixture was stirred under argon at the same temperature until the evolution of gas
stopped (30–40 min). Then 1 mmol of the corresponding unsaturated ketone was added in 2–3 portions.
The reaction mixture was stirred at 0 ◦C for 1–2 h, quenched with cold aqueous NH4Cl solution and
extracted with EtOAc (3
×
10 mL). The combined organic layer was washed with water (5
×
10 mL),
brine (1 10 mL) and dried over Na2SO4. After concentration in vacuo, the residue was purified by
×
column chromatography on a silica gel to afford the desired product.
[(1RS,2RS)-2-(2-Hydroxyphenyl)cyclopropyl](phenyl)methanone (2a). 2-Hydroxychalcone 1a (224 mg,
1.00 mmol). Yield 167 mg (70%); beige solid; mp = 94–95 ◦C (lit. 86–87 ◦C (benzene) [56]). Rf 0.50
1
(petroleum ether:ethyl acetate 3:1). H NMR (CDCl3, 500 MHz)
δ = 1.61–1.64 (m, 1H, CH2), 1.89–1.93
(m, 1H, CH2), 2.87–2.94 (m, 2H, CH+CH), 6.34 (s, 1H, OH), 6.90–6.94 (m, 2H, Ar), 7.10–7.11 (m, 1H,
Ar), 7.16–7.19 (m, 1H, Ar), 7.44–7.47 (m, 2H, Ar), 7.55–7.58 (m, 1H, Ar), 8.03–8.05 (m, 2H, Ar).
3
3
2
1H NMR (DMSO-d6, 500 MHz)
δ = 1.56 (ddd, J = 7.9 Hz, J = 6.9 Hz, J = 3.6 Hz, 1H, CH2),
1.67 (ddd, 3J = 8.9 Hz, 3J = 5.1 Hz, 2J = 3.6 Hz, 1H, CH2), 2.68 (ddd, 3J = 8.9 Hz, 3J = 6.9 Hz, 3J = 4.2 Hz,
1H, CH), 3.02 (ddd, 3J = 7.9 Hz, 3J = 5.1 Hz, 3J = 4.2 Hz, 1H, CH), 6.75 (dt, 3J = 7.5 Hz, 4J = 1.2 Hz,
3
4
1H, Ar), 6.80 (dd, J = 8.4 Hz, J = 1.2 Hz, 1H, Ar), 7.00–7.08 (m, 2H, Ar), 7.50–7.57 (m, 2H, Ar),
7.61–7.67 (m, 1H, Ar), 8.00–8.09 (m, 2H, Ar), 9.48 (br.s, 1H, OH). 13C NMR (CDCl3, 126 MHz) δ = 17.9
(CH2), 25.1 (CH), 27.3 (CH), 115.6 (CH), 120.5 (CH), 126.1 (C), 127.5 (CH), 128.2 (CH), 128.3 (2
×
CH),
128.7 (2 × CH), 133.1 (CH), 137.7 (C), 155.4 (C), 200.2 (CO). IR (cm−1) 3365, 3040, 1645, 1595, 1455,
1365, 1265, 1230, 1040, 990, 835, 750, 720. HRMS ESI-TOF: m/z 239.1066 [M + H]+ (239.1067 calcd for
C16H15O2+). Anal. calcd for C16H14O2: C, 80.65; H, 5.92. Found: C, 80.68; H, 5.90.
[(1RS,2RS)-2-(2-Hydroxyphenyl)cyclopropyl](4-methoxyphenyl)methanone
(2b).
2-Hydroxy-40-
methoxychalcone 1b (254 mg, 1.00 mmol). Yield 204 mg (76%); yellow solid; mp = 129–130
1
◦C. Rf 0.47 (petroleum ether:ethyl acetate 3:1). H NMR (DMSO-d6, 500 MHz)
δ
= 1.51 (ddd, 3J = 7.7
Hz, 3J = 6.8 Hz, 2J = 3.7 Hz, 1H, CH2), 1.65 (ddd, 3J = 8.8 Hz, 3J = 5.1 Hz, 2J = 3.7 Hz, 1H, CH2), 2.70
(ddd, 3J = 8.8 Hz, 3J = 6.8 Hz, 3J = 4.1 Hz, 1H, CH), 2.94–2.99 (m, 1H, CH), 3.82 (s, 3H, CH3O), 6.73–6.78
(m, 1H, Ar), 6.83 (dd, 3J = 7.9 Hz, 4J = 1.2 Hz, 1H, Ar), 6.98–7.06 (m, 4H, Ar), 8.00–8.04 (m, 2H, Ar), 9.48
(br.s, 1H, OH). 13C NMR (DMSO-d6, 126 MHz)
δ
= 17.3, 24.1, 26.8, 55.5, 113.9 (2C), 114.8, 119.0, 125.8,
126.5, 127.2, 130.2, 130.3 (2C), 156.0, 163.1, 196.6. IR (cm−1) 3305, 3290, 3080, 1625, 1605, 1465, 1425, 1360,

Molecules 2020, 25, 5748
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1265, 1210, 1115, 1035, 1010, 970, 865, 775, 735, 725. HRMS ESI-TOF: m/z 291.0996 [M + Na]+ (291.0992
calcd for C17H16NaO3+). Anal. calcd for C17H16O3: C, 76.10; H, 6.01. Found: C, 75.98; H, 6.12.
[(1RS,2RS)-2-(2-Hydroxyphenyl)cyclopropyl](thiophen-2-yl)methanone (2c). 3-(2-Hydroxyphenyl)-1-
(thiophen-2-yl)prop-2-en-1-one 1c (230 mg, 1.00 mmol). Yield 161 mg (66%); yellow solid;
mp = 103–104 ◦C. Rf 0.47 (petroleum ether:ethyl acetate 3:1). 1H NMR (CDCl3, 500 MHz) δ = 1.59
(ddd, 3J = 8.0 Hz, 3J = 6.9 Hz, 2J = 3.9 Hz, 1H, CH2), 1.88 (ddd, 3J = 9.0 Hz, 3J = 5.1 Hz, 2J = 3.9 Hz,
1H, CH2), 2.77 (ddd, 3J = 8.0 Hz, 3J = 5.1 Hz, 3J = 4.1 Hz, 1H, CH), 2.87 (ddd, 3J = 9.0 Hz, 3J = 6.9 Hz,
3J = 4.1 Hz, 1H, CH), 6.37 (s, 1H, OH), 6.85–6.93 (m, 2H, Ar), 7.07 (dd, 3J = 7.8 Hz, 4J = 1.7 Hz, 1H, Ar),
7.10 (dd, 3J = 4.9 Hz, 3J = 3.8 Hz, 1H, Th), 7.12–7.18 (m, 1H, Ar), 7.61 (dd, 3J = 4.9 Hz, 4J = 1.1 Hz, 1H,
Th), 7.83 (dd, 3J = 3.8 Hz, 4J = 1.1 Hz, 1H, Th). 13C NMR (CDCl3, 126 MHz)
δ = 17.6, 24.6, 28.0, 115.7,
120.5, 125.9, 127.6, 128.2, 128.4, 132.4, 134.0, 144.6, 155.4, 192.2. IR (cm−1) 3305, 3290, 3080, 1625, 1605,
1465, 1425, 1360, 1265, 1210, 1115, 1035, 1010, 970, 865, 775, 735, 725. HRMS ESI-TOF: m/z 267.0450
[M + Na]+ (267.0450 calcd for C14H12NaO2S+). Anal. calcd for C14H12O2S: C, 68.83; H, 4.95. Found: C,
68.79; H, 4.87.
[(1RS,2RS)-2-(5-Fluoro-2-hydroxyphenyl)cyclopropyl](4-methoxyphenyl)methanone
(2d). 5-Fluoro-2-
hydroxy-40-methoxychalcone 1d (272 mg, 1.00 mmol). Yield 223 mg (78%); yellow solid;
1
mp = 131–132 ◦C. Rf 0.47 (petroleum ether:ethyl acetate 3:1). H NMR (DMSO-d6, 500 MHz) δ = 1.51
(ddd, 3J = 8.0 Hz, 3J = 6.9 Hz, 2J = 3.7 Hz, 1H, CH2), 1.63 (ddd, 3J = 8.9 Hz, 3J = 5.0 Hz, 2J = 3.7 Hz
,
1H, CH2), 2.66–2.75 (m, 1H, CH), 3.02–3.09 (m, 1H, CH), 3.83 (s, 3H, OCH3), 6.76–6.90 (m, 3H, Ar),
3
7.03 (d, 3J = 8.8 Hz, 2H, Ar), 8.04 (d, J = 8.8 Hz, 2H, Ar), 9.46 (s, 1H, OH); 13C NMR (DMSO-d6,
2
2
126 MHz)
δ = 17.7, 23.5, 26.8, 55.5, 112.1 (d, JC–F = 23 Hz), 113.1 (d, JC–F = 23 Hz), 113.9 (2C),
115.5 (d, 3JC–F = 8 Hz), 128.4 (d, 3JC–F = 8 Hz), 130.1, 130.3 (2C), 152.1, 155.8 (d, 1JC–F = 233 Hz), 163.1,
196.3. 19F NMR (DMSO-d6, 471 MHz)
δ
=
125.2. IR (cm−1) 3325, 3015, 1635, 1600, 1570, 1515, 1440,
−
1265, 1240, 1175, 1025, 845, 820, 755. HRMS ESI-TOF: m/z 287.1077 [M + H]+ (287.1078 calcd for
C17H16FO3+). Anal. calcd for C17H15FO3: C, 71.32; H, 5.28. Found: C, 71.32; H, 5.19.
[(1RS,2RS)-2-(2-5-Bromo-2-hydroxyphenyl)cyclopropyl](4-methoxyphenyl)methanone (2e). 5-Bromo-2-
hydroxy-40-methoxychalcone 1e (333 mg, 1.00 mmol). Yield 222 mg (64%); colorless solid;
mp 143–144 ◦C. Rf 0.40 (petroleum ether:ethyl acetate 3:1). 1H NMR (CDCl3, 500 MHz):
δ
1.50
(ddd, 3J = 8.2 Hz, 3J = 6.7 Hz, 2J = 3.9 Hz, 1H, CH2), 1.80 (ddd, 3J = 9.0 Hz, 3J = 5.2 Hz, 2J = 3.9 Hz, 1H,
CH2), 2.71–2.81 (m, 2H, 2
CH), 3.86 (s, 3H, OCH3), 6.18 (s, 1H, OH), 6.75 (d, 3J = 8.5 Hz, 1H, Ar),
6.90 (d, 3J = 8.9 Hz, 2H, Ar), 7.15 (d, 4J = 2.3 Hz, 1H, Ar), 7.23 (dd, 3J = 8.5 Hz, 4J = 2.3 Hz, 1H, Ar),
7.97 (d, 3J = 8.9 Hz, 2H, Ar). 13C NMR (CDCl3, 126 MHz):
17.3, 23.4, 26.7, 55.6, 112.6, 114.0 (2C),
×
δ
117.5, 128.5, 130.3, 130.4, 130.7 (2C), 131.0, 154.6, 163.8, 197.7. IR (cm−1) 3220, 2930, 1620, 1600, 1565,
1425, 1410, 1265, 1235, 1165, 1030, 995, 850, 815, 750. HRMS ESI-TOF: m/z 347.0280/349.0258 [M + H]+
(347.0277/349.0258 calcd for C17H1679BrO3+/C17H1681BrO3+). Anal. calcd for C17H15BrO3: C, 58.81; H,
4.35. Found: C, 58.80; H, 4.29.
[(1RS,2RS)-2-(2-Hydroxy-5-nitrophenyl)cyclopropyl](4-methoxyphenyl)methanone (2f). 2-Hydroxy-5-
nitro-40-methoxychalcone 1f (554 mg, 1.85 mmol). Yield 470 mg (81%); yellow solid; mp 183–184 ◦C.
1
Rf 0.69 (petroleum ether:ethyl acetate 3:1). H NMR (DMSO-d6, 500 MHz)
δ = 1.58–1.67 (m, 2H, CH2),
2.69 (ddd, 3J = 8.9 Hz, 3J = 6.9 Hz, 3J = 4.2 Hz, 1H, CH), 3.14 (ddd, 3J = 8.0 Hz, 3J = 5.2 Hz, 3J = 4.2 Hz
,
1H, CH), 3.84 (s, 3H, OCH3), 6.97 (d, 3J = 8.9 Hz, 1H, Ar), 7.02–7.08 (m, 2H, Ar), 7.91 (d, 4J = 2.8 Hz,
1H, Ar), 8.01 (dd, 3J = 8.9 Hz, 4J = 2.8 Hz, 1H, Ar), 8.04–8.10 (m, 2H, Ar), 11.21 (s, 1H, OH). 13C NMR
(DMSO-d6, 125 MHz):
δ 17.2, 23.0, 26.5, 55.5, 113.9 (2C), 114.9, 122.1, 124.0, 128.0, 130.0, 130.4 (2C),
139.7, 162.6, 163.2, 196.2. IR (cm−1) 2925, 1635, 1595, 1565, 1530, 1495, 1335, 1285, 1235, 1175, 1090, 1010,
925, 830, 745. HRMS ESI-TOF: m/z 314.1022 [M + H]+ (314.1023 calcd for C17H16NO5+).
[(1RS,2RS)-2-(5-Fluoro-2-hydroxyphenyl)cyclopropyl](phenyl)methanone (2g). 5-Fluoro-2-hydroxychalcone 1g
(242 mg, 1.00 mmol). Yield 147 mg (57% yield); yellow solid; mp 95–96 ◦C. Rf 0.81 (petroleum ether:ethyl
1
acetate 3:1). H NMR (CDCl3, 500 MHz)
δ
= 1.51–1.57 (m, 1H, CH2), 1.87 (ddd, 3J = 8.2 Hz, 3J = 5.9 Hz,
2J = 4.0 Hz, 1H, CH2), 2.84–2.91 (m, 2H, CH + CH), 6.66–6.77 (m, 2H, Ar + OH), 6.77–6.84 (m, 2H, Ar),
7.36–7.45 (m, 2H, Ar), 7.48–7.57 (m, 1H, Ar), 7.93–8.04 (m, 2H, Ar). 13C NMR (CDCl3, 126 MHz)
= 18.1,
δ

Molecules 2020, 25, 5748
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25.0, 27.6, 113.4 (d, 2JC–F = 23 Hz), 114.2 (d, 2JC–F = 23 Hz), 116.5 (d, 3JC–F = 9 Hz), 127.3 (d, 3JC–F = 7 Hz),
128.3 (2C), 128.7 (2C), 133.3, 137.4, 151.4, 155.9 (d, 1JC–F = 234 Hz), 200.4. 19F NMR (DMSO-d6, 471 MHz)
δ= −125.3. IR (cm−1) 3355, 3085, 1640, 1510, 1440, 1365, 1270, 1230, 1180, 1015, 810, 770, 715. HRMS
ESI-TOF: m/z 257.0979 [M + H]+ (257.0972 calcd for C16H14FO2+). Anal. calcd for C16H13FO2: C, 74.99;
H, 5.11. Found: C, 74.98; H, 4.97.
[(1RS,2RS)-2-(5-Bromo-2-hydroxyphenyl)cyclopropyl](phenyl)methanone (2h). 5-Bromo-2-hydroxychalcone
1h (272 mg, 0.90 mmol). Yield 182 mg (64% yield); colorless solid; mp 117–118 ◦C. Rf 0.40 (petroleum
1
ether:ethyl acetate 3:1). H NMR (CDCl3, 500 MHz)
δ
= 1.55 (ddd, 3J = 8.3 Hz, 3J = 6.8 Hz, 2J = 4.0 Hz, 1H,
CH2), 1.80–1.86 (m, 1H, CH2), 2.79 (ddd, 3J = 9.0 Hz, 3J = 6.8 Hz, 3J = 4.3 Hz 1H, CH), 2.81–2.89 (m, 1H,
CH), 5.96 (s, 1H, OH), 6.74 (d, 3J = 8.5 Hz, 1H, Ar), 7.14–7.16 (m, 1H, Ar), 7.19–7.25 (m, 1H, Ar), 7.40–7.48
(m, 2H, Ar), 7.52–7.60 (m, 1H, Ar), 7.93–8.02 (m, 2H, Ar). 13C NMR (CDCl3, 126 MHz)
δ= 17.8, 24.0, 27.1,
112.6, 117.4, 128.3 (2C), 128.4, 128.8 (2C), 130.3, 131.0, 133.4, 137.5, 154.5, 199.4. IR (cm−1) 3210, 2980, 1625,
1590, 1445, 1405, 1390, 1240, 1165, 1030, 1000, 790, 730. HRMS ESI-TOF: m/z 317.0166/319.0147 [M + H]+
(317.0172/319.0152 calcd for C16H1479BrO2+/C16H1481BrO2+).
[(1RS,2RS)-2-(2-Hydroxy-5-nitrophenyl)cyclopropyl](phenyl)methanone (2i). 2-Hydroxy-5-nitrochalcone 1i
(135 mg, 0.50 mmol). Yield 99 mg (70%); pale yellow solid; 1H NMR (DMSO-d6, 400 MHz)
δ= 1.63–1.74
(m, 2H, CH2), 2.68–2.76 (m, 1H, CH), 3.12–3.22 (m, 1H, CH), 6.91–7.03 (m, 1H, Ar), 7.47–7.58 (m, 2H,
Ar), 7.61–7.70 (m, 1H, Ar), 7.88–7.96 (m, 1H, Ar), 7.99–8.14 (m, 3H, Ar), 11.23 (br. s, 1H, OH). 13C NMR
(DMSO-d6, 100 MHz)
162.6, 198.0. HRMS (ESI/TOF): m/z 284.0920 [M + H]+ (284.0917 calcd. for C16H14NO4+).
[(1RS,2RS)-2-(5-Fluoro-2-hydroxyphenyl)cyclopropyl](thiophen-2-yl)methanone 2j).
δ= 17.5, 23.6, 27.0, 114.9, 122.2, 124.0, 127.8, 128.1 (2C), 128.7 (2C), 133.2, 137.0, 139.7,
(
3-(5-Fluoro-2-
hydroxyphenyl)-1-(thiophen-2-yl)prop-2-en-1-one 1j (496 mg, 2.00 mmol). Yield 405 mg (77% yield);
1
yellow solid; mp 107–108 ◦C. Rf 0.53 (petroleum ether:ethyl acetate 3:1). H NMR (CDCl3, 500 MHz)
3
3
2
3
3
δ = 1.51 (ddd, J = 8.2 Hz, J = 6.8 Hz, J = 4.1 Hz, 1H, CH2), 1.86 (ddd, J = 9.0 Hz, J = 5.1 Hz,
2J = 4.1 Hz, 1H, CH2), 2.73 (ddd, 3J = 8.2 Hz, 3J = 5.1 Hz, 3J = 4.2 Hz, 1H, CH), 2.81 (ddd, 3J = 9.0 Hz,
3J = 6.8 Hz, 3J = 4.2 Hz, 1H, CH), 5.72 (br. s, 1H, OH), 6.70–6.87 (m, 3H, Ar), 7.14 (dd, 3J = 4.9 Hz,
3J = 3.8 Hz, 1H, Th), 7.65 (dd, 3J = 4.9 Hz, 4J = 0.9 Hz, 1H, Th), 7.84 (dd, 3J = 3.8 Hz, 4J = 0.9 Hz, 1H,
Th). 13C NMR (CDCl3, 125 MHz)
116.5 (d, 3JC–F = 8 Hz), 127.4 (d, 3JC–F = 7 Hz), 128.5, 132.4, 134.2, 144.5, 151.2, 157.0 (d, 1JC–F = 239 Hz),
191.4. 19F NMR (DMSO-d6, 471 MHz) 125.3. IR (cm−1) 3370, 3095, 1620, 1555, 1495, 1410, 1370,
1345, 1270, 1220, 1100, 1050, 905, 855, 755, 715. Anal. calcd for C14H11FO2S: C, 64.11; H, 4.23. Found:
C, 64.22; H, 4.17.
δ
= 17.6, 23.8, 28.0, 113.8 (d, 2JC–F = 24 Hz), 114.4 (d, 2JC–F = 24 Hz),
δ
=
−
[(1RS,2RS)-2-(5-Chloro-2-hydroxyphenyl)cyclopropyl](thiophen-2-yl)methanone
(2k).
3-(5-Chloro-2-
hydroxyphenyl)-1-(thiophen-2-yl)prop-2-en-1-one 1k (175 mg, 0.66 mmol). Yield 135 mg (73%
1
yield); pale yellow solid; mp 112–113 ◦C. Rf 0.58 (petroleum ether:ethyl acetate 3:1). H NMR (CDCl3,
500 MHz) δ= 1.53 (ddd, 3J = 8.2 Hz, 3J = 6.8 Hz, 2J = 4.1 Hz, 1H, CH2), 1.84 (ddd, 3J = 9.0 Hz, 3J = 5.1 Hz,
2J = 4.1 Hz, 1H, CH2), 2.72 (ddd, 3J = 8.2 Hz, 3J = 5.1 Hz, 3J = 4.2 Hz, 1H, CH), 2.81 (ddd, 3J = 9.0 Hz,
3J = 6.8 Hz 3J = 4.2 Hz, 1H, CH), 6.16 (s, 1H, OH), 6.79 (d, 3J = 8.5 Hz, 1H, Ar), 6.99 (d, 4J = 2.5 Hz, 1H, Ar),
,
7.08 (dd, 3J = 8.5 Hz, 4J = 2.5 Hz, 1H, Ar), 7.13 (dd, 3J = 4.9 Hz, 3J = 3.8 Hz, 1H, Th), 7.64 (dd, 3J = 4.9 Hz,
1
4J = 1.1 Hz, 1H, Th), 7.83 (d, 3J = 3.8 Hz; 4J = 1.1 Hz, 1H, Th). H NMR (DMSO-d6, 500 MHz)
δ= 1.54–1.62
(m, 2H, CH2), 2.69 (ddd, 3J = 9.0 Hz, 3J = 7.0 Hz, 3J = 4.2 Hz, 1H, CH), 3.07 (ddd, 3J = 8.0 Hz, 3J = 5.1 Hz,
3J = 4.2 Hz, 1H, CH), 6.78–6.82 (m, 1H, Ar), 7.03–7.09 (m, 2H, Ar), 7.25 (dd, 3J = 4.9 Hz, 3J = 3.8 Hz, 1H, Th),
8.02 (dd, 3J = 4.9 Hz, 4J = 1.1 Hz, 1H, Th), 8.20 (dd, 3J = 3.8 Hz, 4J = 0.9 Hz, 1H, Th), 9.80 (s, 1H, OH).
13C NMR (CDCl3, 126 MHz)
δ= 17.6, 23.8, 28.0, 117.0, 125.3, 127.3, 127.7, 128.0, 128.5, 132.6, 134.3, 144.4,
154.0, 191.7. IR (cm−1) 3480, 3405, 3105, 1620, 1515, 1500, 1415, 1340, 1270, 1245, 1110, 970, 820, 720. HRMS
ESI-TOF: m/z 301.0063 [M + Na]+ (301.0060 calcd for C14H11ClNaO2S+). Anal. calcd for C14H11ClO2S:
C, 60.32; H, 3.98. Found: C, 60.18; H, 3.87.
[(1RS,2RS)-2-(5-Bromo-2-hydroxyphenyl)cyclopropyl](thiophen-2-yl)methanone (2l).
3-(5-Bromo-2-
hydroxyphenyl)-1-(thiophen-2-yl)prop-2-en-1-one 1l (273 mg, 0.90 mmol). Yield 182 mg (64% yield);
◦
colorless solid; mp 117–118 C. Rf 0.40 (petroleum ether:ethyl acetate 3:1). 1H NMR (CDCl3, 500

Molecules 2020, 25, 5748
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MHz)
δ
= 1.51–1.58 (m, 1H, CH2), 1.80–1.86 (m, 1H, CH2), 2.74–2.81 (m, 1H, CH), 2.81–2.89 (m, 1H,
3
CH), 5.96 (s, 1H, OH), 6.74 (d, J = 8.5 Hz, 1H, Ar), 7.14–7.16 (m, 1H, Ar), 7.19–7.25 (m, 1H, Ar),
1
7.40–7.48 (m, 2H, Ar), 7.52–7.60 (m, 1H, Ar), 7.93–8.02 (m, 2H, Ar). H NMR (DMSO-d6, 500 MHz)
δ = 1.53–1.61 (m, 2H, CH2), 2.68 (ddd, 3J = 9.0 Hz, 3J = 7.0 Hz, 3J = 4.2 Hz, 1H, CH), 3.03–3.09 (m, 1H,
CH), 6.75 (d, 3J = 8.4 Hz, 1H, Ar), 7.15–7.21 (m, 2H, Ar), 7.25 (dd, 3J = 5.0 Hz, 3J = 3.8 Hz, 1H, Th),
8.02 (dd, 3J = 5.0 Hz, J = 1.1 Hz, 1H, Th), 8.20 (dd, J = 3.8 Hz, J = 1.1 Hz, 1H, Th), 9.83 (s, 1H,
4
3
4
OH). 13C NMR (CDCl3, 126 MHz)
δ = 17.8, 24.0, 27.1, 112.6, 117.4, 128.3 (2C), 128.4, 128.8 (2C),
130.3, 131.0, 133.4, 137.5, 154.5, 199.4. IR (cm−1) 3210, 2980, 1625, 1590, 1445, 1405, 1390, 1240, 1165,
1030, 1000, 790, 730. HRMS ESI-TOF: m/z 317.0166/319.0147 [M + H]+ (317.0172/319.0152 calcd for
C16H1479BrO2+/C16H1481BrO2+).
[(1RS,2RS)-2-(2-Hydroxy-5-nitrophenyl)cyclopropyl](thiophen-2-yl)methanone
(2m).
3-(2-Hydroxy-5-
nitrophenyl)-1-(thiophen-2-yl)prop-2-en-1-one 1m (206 mg, 0.75 mmol). Yield 180 mg (83% yield);
1
yellow solid; mp 196–197 ◦C. Rf 0.74 (petroleum ether:ethyl acetate 3:1). H NMR (DMSO-d6, 500 MHz)
δ= 1.57–1.61 (m, 1H, CH2), 1.86–1.89 (m, 1H, CH2), 2.73–2.75 (m, 1H, CH), 2.88–2.92 (m, 1H, CH),
6.91 (d, 3J = 8.8 Hz, 1H, Ar), 7.15 (dd, 3J = 4.9 Hz, 3J = 3.8 Hz, 1H, Th), 7.29 (s, 1H, OH), 7.65 (dd, 3J = 4.9 Hz
,
3
4
4
4J = 1.0 Hz, 1H, Th), 7.83 (dd, J = 3.8 Hz, J = 1.0 Hz, 1H, Th), 7.88 (d, J = 2.6 Hz, 1H, Ar),
7.97 (dd, 3J = 8.9 Hz, 4J = 2.6 Hz, 1H, Ar). 13C NMR (DMSO-d6, 126 MHz)
δ= 17.3, 23.0, 27.4, 114.9, 122.2,
124.0, 127.6, 128.9, 133.8, 135.1, 139.7, 144.2, 162.6, 190.8. IR (cm−1) 3230, 2925, 1610, 1590, 1525, 1500, 1410,
1340, 1285, 1240, 1090, 1060, 990, 835, 735. HRMS ESI-TOF: m/z 312.0300 [M + Na]+ (312.0301 calcd for
C14H11NaNO4S+).
[(1RS,2RS)-2-(2-Hydroxy-3-methoxyphenyl)cyclopropyl](phenyl)methanone
(
2n).
3-(2-Hydroxy-3-
methoxyphenyl)-1-(phenyl)prop-2-en-1-one 1n (254 mg, 1.00 mmol). Yield 147 mg (55% yield);
colorless oil. Rf 0.54 (petroleum ether:ethyl acetate 3:1). 1H NMR (CDCl3, 500 MHz)
δ =
1.59–1.66 (m, 1H, CH2), 1.92 (ddd, 3J = 9.0 Hz, 3J = 5.2 Hz, 2J = 3.8 Hz, 1H, CH2), 2.89 (ddd, 3J = 9.0 Hz,
3J = 6.8 Hz, 3J = 4.2 Hz, 1H, CH), 2.95 (ddd, 3J = 7.9 Hz, 3J = 5.2 Hz, 3J = 4.2 Hz, 1H, CH), 3.90 (s, 3H,
OCH3), 5.88 (s, 1H, OH), 6.70–6.71 (m, 1H, Ar), 6.79–6.86 (m, 2H, Ar), 7.46–7.49 (m, 2H, Ar), 7.55–7.58
(m, 1H, Ar), 8.06–8.07 (m, 2H, Ar). 13C NMR (CDCl3, 126 MHz)
δ
= 17.6 (CH2), 25.4 (CH), 27.5 (CH),
CH), 128.5 (2 CH), 132.7 (CH),
56.1 (CH3), 109.1 (CH), 118.9 (CH), 119.5 (CH), 126.1 (C), 128.2 (2
×
×
138.1 (C), 144.8 (C), 146.5 (C), 199.4 (CO). IR (cm−1) 3220, 2985, 1640, 1570, 1530, 1465, 1405, 1310, 1270,
1225, 1070, 860, 755, 735. Anal. calcd for C17H16O3: C, 76.10; H, 6.01. Found: C, 76.28; H, 5.97.
[(1RS,2RS)-2-(3-Ethoxy-2-hydroxyphenyl)cyclopropyl](phenyl)methanone
(
2o).
3-(3-Ethoxy-2-
hydroxyphenyl)-1-(phenyl)prop-2-en-1-one 1o (537 mg, 2.00 mmol). Yield 368 mg (65% yield);
1
colorless solid; mp 80–81 ◦C. Rf 0.71 (petroleum ether:ethyl acetate 4:1). H NMR (CDCl3, 500 MHz)
3
3
3
2
δ = 1.33 (t, J = 7.0 Hz, 3H, OCH2C
1.68 (ddd, 3J = 9.0 Hz, 3J = 5.1 Hz, 2J = 3.6 Hz, 1H, CH2), 2.72 (ddd, 3J = 9.0 Hz, 3J = 6.9 Hz, 3J = 4.1 Hz,
1H, CH), 3.01 (ddd, 3J = 7.9 Hz, 3J = 5.1 Hz, 3J = 4.1 Hz, 1H, CH), 4.02 (q, 3J = 7.0 Hz, 2H, OC
2CH3),
6.63–6.66 (m, 1H, Ar), 6.69–6.73 (m, 1H, Ar), 6.80–6.84 (m, 1H, Ar), 7.50–7.55 (m, 2H, Ar), 7.60–7.66
(m, 1H, Ar), 8.00–8.05 (m, 2H, Ar), 8.42 (s, 1H, OH). 13C NMR (DMSO-d6, 125 MHz)
= 14.7, 17.6, 24.8,
27.2, 64.1, 111.2, 117.7, 118.8, 126.6, 127.9 (2C), 128.7 (2C), 133.0, 137.3, 145.3, 146.3, 198.3. IR (cm−1
H3), 1.55 (ddd, J = 7.9 Hz, J = 6.9 Hz, J = 3.6 Hz, 1H, CH2),
H
δ
)
3390, 2995, 1670, 1615, 1590, 1495, 1470, 1400, 1350, 1275, 1225, 1175, 1070, 1005, 960, 775, 755, 720, 690.
Anal. calcd for C18H18O3: C, 76.57; H, 6.43. Found: C, 76.58; H, 6.41.
[(1RS,2RS)-2-(3-Ethoxy-2-hydroxyphenyl)cyclopropyl](thiophen-2-yl)methanone (2p).
3-(3-Ethoxy-2-
hydroxyphenyl)-1-(2-thienyl)prop-2-en-1-one 1p (549 mg, 2.00 mmol). Yield 388 mg (67% yield);
1
colorless solid; mp 77–78 ◦C. Rf 0.52 (petroleum ether:ethyl acetate 4:1). H NMR (DMSO-d6, 500 MHz)
δ
= 1.34 (t, 3JCH = 7.0 Hz, 3H, OCH2C 3), 1.54 (ddd, 3J = 8.0 Hz, 3J = 7.0 Hz, 2J = 3.7 Hz, 1H, CH2),
H
1.63 (ddd, 3J = 9.0 Hz, 3J = 5.1 Hz, 2J = 3.7 Hz, 1H, CH2), 2.75 (ddd, 3J = 9.0 Hz, 3J = 7.0 Hz, 3J = 4.1 Hz,
1H, CH), 2.95 (ddd, 3J = 8.0 Hz, 3J = 5.1 Hz, 3J = 4.1 Hz, 1H, CH), 4.03 (q, 3J = 7.0 Hz, 2H, OC
H2CH3),
6.62–6.64 (m, 1H, Ar), 6.70–6.73 (m, 1H, Ar), 6.81–6.83 (m, 1H, Ar), 7.24 (dd, 3J = 3.8 Hz, 3J = 5.0 Hz, 1H,
Th), 8.00 (dd, 3J = 5.0 Hz, 4J = 1.2 Hz, 1H, Th), 8.20 (dd, 3J = 3.8 Hz, 4J = 1.2 Hz, 1H, Th), 8.42 (s, 1H, OH).
13C NMR (DMSO-d6, 125 MHz):
δ 14.7 (OCH2CH3), 17.4 (CH2), 24.1 (CH), 27.6 (CH), 64.1 (OCH2CH3),

Molecules 2020, 25, 5748
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111.3 (CH), 117.7 (CH), 118.8 (CH), 126.5 (C), 133.2 (CH), 134.7 (CH), 144.4 (C), 145.3 (C), 146.3 (C),
191.0 (CO). IR (cm−1) 3360, 3105, 2980, 1630, 1605, 1470, 1415, 1350, 1275, 1245, 1220, 1185, 1070, 860,
775, 730. Anal. calcd for C16H16O3S: C, 66.64; H, 5.59. Found: C, 66.67; H, 5.52.
4. Conclusions
To conclude, we developed a simple general approach to (het)aryl 2-(2-hydroxyaryl)cyclopropyl
ketones 2 based on the Corey–Chaykovsky cyclopropanation of 2-hydroxychalcones, determined the
scope and limitations of this reaction. The obtained D–A cyclopropanes are promising building blocks
for the synthesis of diverse heterocyclic compounds and bioactive substances.
Supplementary Materials: Copies of NMR spectra for novel compounds are available online.
Author Contributions: Conceptualization, M.G.U. and I.V.T.; methodology, O.A.I. and M.G.U.; investigation,
A.A.F., A.O.C., I.I.L., and A.S.M.; resources, O.A.I. and I.V.T.; writing, A.S.M., M.G.U., and I.V.T.; supervision,
I.V.T.; project administration, M.G.U.; funding acquisition, I.V.T. All authors have read and agreed to the published
version of the manuscript.
Funding: This research was funded by the Russian Science Foundation (grant 18-13-00449).
Acknowledgments: Crystal structure determination was performed in the Department of Structural Studies of
N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences, Moscow.
Conflicts of Interest: The authors declare no conflict of interest.
References
1.
2.
3.
4.
5.
6.
7.
8.
Reissig, H.-U.; Zimmer, R. Donor–Acceptor-Substituted Cyclopropane Derivatives and Their Application in
Organic Synthesis. Chem. Rev. 2003, 103, 1151–1196. [CrossRef] [PubMed]
Schneider, T.F.; Kaschel, J.; Werz, D.B. A New Golden Age for Donor–Acceptor Cyclopropanes. Angew. Chem.
Int. Ed. 2014, 53, 5504–5523. [CrossRef] [PubMed]
Cavitt, M.A.; Phun, L.H.; France, S. Intramolecular donor–acceptor cyclopropane ring-opening cyclizations.
Chem. Soc. Rev. 2014, 43, 804–818. [CrossRef] [PubMed]
Budynina, E.M.; Ivanov, K.L.; Sorokin, I.D.; Melnikov, M.Y. Ring Opening of Donor–Acceptor Cyclopropanes
with N-Nucleophiles. Synthesis 2017, 49, 3035–3068. [CrossRef]
Ivanova, O.A.; Trushkov, I.V. Donor–Acceptor Cyclopropanes in the Synthesis of Carbocycles. Chem. Rec.
2019, 19, 2189–2208. [CrossRef] [PubMed]
Tomilov, Y.V.; Menchikov, L.G.; Novikov, R.A.; Ivanova, O.A.; Trushkov, I.V. Methods for the synthesis of
donor–acceptor cyclopropanes. Russ. Chem. Rev. 2018, 87, 201–250. [CrossRef]
Guin, A.; Rathod, T.; Gaykar, R.N.; Roy, T.; Biju, A.T. Lewis Acid Catalyzed Ring-Opening 1,3-Aminothiolation
of Donor–Acceptor Cyclopropanes using Sulfenamides. Org. Lett. 2020, 22, 2276–2280. [CrossRef]
Mondal, B.; Das, D.; Saha, J. Multicomponent, Tandem 1,3- and 1,4-Bisarylaltion of Donor–Acceptor
Cyclopropanes and Cyclobutanes with Electron-Rich Arenes and Hypervalent Arylbismuth Reagents.
Org. Lett. 2020, 22, 5115–5120. [CrossRef]
9.
Zhang, D.; Zhong, J.; Yin, L.; Chen, Y.; Man, J.; Zhang, Q.-F. Desymmetrization of 1-Symmetrical Donor–Acceptor
(D–A) Cyclopropanes via Reactions with 1,3-Cyclodiones. J. Org. Chem. 2020, 85, 5778–5786. [CrossRef]
10. Boichenko, M.A.; Andreev, I.A.; Chagarovskiy, A.O.; Levina, I.I.; Zhokhov, S.S.; Trushkov, I.V.; Ivanova, O.A.
Ring Opening of Donor–Acceptor Cyclopropanes with Cyanide Ion and Its Surrogates. J. Org. Chem.
2020, 85, 1146–1157. [CrossRef]
11. Sridhar, P.R.; Seshadri, K.; Reddy, G.M. Stereoselective synthesis of sugar fused β-disubstituted γ-butyro-lactones:
C-spiro-glycosides from 1,2-cyclopropanecarboxylated sugars. Chem. Commun. 2012, 48, 756–758. [CrossRef]
[PubMed]
12. Cermola, F.; Di Gioia, L.; Garziano, M.L.; Iesce, M.R. Ring-opening reactions of cyclopropanes. Part 8.
Nitrosation of donor-acceptor cyclopropanes. J. Chem. Res. 2005, 677–681. [CrossRef]
13. Garve, L.K.B.; Barkawitz, P.; Jones, P.G.; Werz, D.B. Ring-Opening 1,3-Dichlorination of Donor–Acceptor
Cyclopropanes by Iodobenzene Dichloride. Org. Lett. 2014, 16, 5804–5807. [CrossRef] [PubMed]
14. Ieki, R.; Kani, Y.; Tsunoi, S.; Shibata, I. Transition-Metal-Free Coupling Reaction of Vinylcyclopropanes with
Aldehydes Catalyzed by Tin Hydride. Chem. Eur. J. 2015, 21, 6295–6300. [CrossRef]

Molecules 2020, 25, 5748
12 of 15
15. Xu, C.; Wei, N.; Zhu, D.; Wang, M. Cyclopentene Synthesis by a Catalytic [3 + 2] Annulation of Donor–Acceptor
Cyclopropanes with Polarized Alkenes. ChemistrySelect 2020, 5, 11399–11402. [CrossRef]
16. Ahlburg, N.L.; Jones, P.G.; Werz, D.B. cis-Selective, Enantiospecific Addition of Donor–Acceptor Cyclopropanes
to Activated Alkenes: An Iodination/Michael-Cyclization Cascade. Org. Lett. 2020, 22, 6404–6408. [CrossRef]
17. Su, P.; Li, H.; Chen, W.; Luo, G.; Yang, G.; Chai, Z. Lewis Acid Catalyzed [3 + 2] Annulations of
γ
-Butyrolactam-Fused Donor–Acceptor Cyclopropanes with Aromatic Aldehydes and Aldimines. Eur. J.
Org. Chem. 2020, 2020, 5380–5387. [CrossRef]
18. Mloston, G.; Kowalczyk, M.; Augustin, A.U.; Jones, P.G.; Werz, D.B. Ferrocenyl-substituted
tetrahydrothiophenes via formal [3 + 2]-cycloaddition reactions of ferrocenyl thioketones with donor-acceptor
cyclopropanes. Beilstein J. Org. Chem. 2020, 16, 1288–1295. [CrossRef]
19. Lücht, A.; Kreft, A.; Jones, P.G.; Werz, D.B. Ketenedithioacetals as Surrogates for the Formal Insertion of
Ketenes into Donor–Acceptor Cyclopropanes. Eur. J. Org. Chem. 2020, 2020, 2560–2564. [CrossRef]
20. Mikhaylov, A.A.; Kuleshov, A.V.; Solyev, P.N.; Korlyukov, A.A.; Dorovatovskii, P.V.; Mineev, K.S.; Baranov, M.S.
Imidazol-5-one as an Acceptor in Donor–Acceptor Cyclopropanes: Cycloaddition with Aldehydes. Org. Lett.
2020, 22, 2740–2745. [CrossRef]
21. Nguyen, H.M.; Chand, H.R.; Golantsov, N.E.; Trushkov, I.V.; Voskressensky, L.G. Cyclopentene
Assembly by Microwave-Assisted Domino Reaction of Donor–Acceptor Cyclopropanes with Ketals.
Synlett 2020, 31, 295–299. [CrossRef]
22. Xia, M.-M.; Li, F.-X.; Ma, Y.-P.; Song, L.-L.; Hou, Y.-N.; Shi, Z.-F.; Cao, X.P. Synthesis of Chiral Aza-[n.2.1]
Skeletons by Separable Epimers of Intramolecular [3 + 2] Cross Cycloaddition of Cyclopropane 1,1-Diesters
with Chiral Sulfinylimines. Adv. Synth. Catal. 2020, 362, 1112–1124. [CrossRef]
23. Dhote, P.S.; Ramana, C.V. One-Pot Au(III)-/Lewis Acid Catalyzed Cycloisomerization of Nitroalkynes and
[3 + 3]Cycloaddition with Donor–Acceptor Cyclopropanes. Org. Lett. 2019, 21, 6221–6224. [CrossRef]
[PubMed]
24. Petzold, M.; Jones, P.G.; Werz, D.B. (3 + 3)-Annulation of Carbonyl Ylides with Donor–Acceptor Cyclopropanes:
Synergistic Dirhodium(II) and Lewis Acid Catalysis. Angew. Chem. Int. Ed. 2019, 58, 6225–6229. [CrossRef]
25. Chagarovskiy, A.O.; Vasin, V.S.; Kuznetsov, V.V.; Ivanova, O.A.; Rybakov, V.B.; Shumsky, A.N.; Makhova, N.N.;
Trushkov, I.V. (3 + 3)-Annulation of Donor–Acceptor Cyclopropanes with Diaziridines. Angew. Chem. Int. Ed.
2018, 57, 10338–10342. [CrossRef]
26. Zhang, X.; Feng, M.; Yang, G.; Chai, Z. Sc(OTf)3-Catalyzed Chemodivergent Annulations of
γ-Butyrolactone-Fused Cyclopropanes with Anthranils. J. Org. Chem. 2020, 85, 430–440. [CrossRef]
27. Augustin, A.U.; Merz, J.L.; Jones, P.G.; Mloston, G.; Werz, D.B. (4 + 3)-Cycloaddition of Donor–Acceptor
Cyclopropanes with Thiochalcones: A Diastereoselective Access to Tetrahydrothiepines. Org. Lett.
2019, 21, 9405–9409. [CrossRef]
28. Chagarovskiy, A.O.; Ivanova, O.A.; Budynina, E.M.; Kolychev, E.L.; Nechaev, M.S.; Trushkov, I.V.;
Mel’nikov, M.Y. Reaction of donor-acceptor cyclopropanes with 1,3-diphenylisobenzofuran. Lewis acid
effect on the reaction pathway. Russ. Chem. Bull. 2013, 62, 2407–2423. [CrossRef]
29. Chagarovskiy, A.O.; Ivanova, O.A.; Rakhmankulov, E.R.; Budynina, E.M.; Trushkov, I.V.; Mel’nikov, M.Y.
Lewis Acid-Catalyzed Isomerization of 2-Arylcyclopropane-1,1-dicarboxylates: A New Efficient Route to
2-Styrylmalonates. Adv. Synth. Catal. 2010, 352, 3179–3184. [CrossRef]
30. Tsuruda, K.; Tokumoto, T.; Inoue, N.; Nakajima, M.; Nemoto, T. Synthesis of 7-Membered Ring Carbocycles
via a Palladium-Catalyzed Intramolecular Allylic Alkylation–Isomerization–Cope Rearrangement Cascade.
Eur. J. Org. Chem. 2018, 2018, 2836–2840. [CrossRef]
31. Borisov, D.D.; Novikov, R.A.; Tomilov, Y.V. GaCl3-Mediated Reactions of Donor–Acceptor Cyclopropanes
with Aromatic Aldehydes. Angew. Chem. Int. Ed. 2016, 55, 12233–12237. [CrossRef] [PubMed]
32. Novikov, R.A.; Korolev, V.A.; Timofeev, V.P.; Tomilov, Y.V. New dimerization and cascade oligomerization
reactions of dimethyl 2-phenylcyclopropan-1,1-dicarboxylate catalyzed by Lewis acids. Tetrahedron Lett.
2011, 52, 4996–4999. [CrossRef]
33. Novikov, R.A.; Tarasova, A.V.; Tomilov, Y.V. GaGl3-Mediated Isomerization of Donor–Acceptor
Cyclopropanes into (2-Arylalkylidene)malonates. Synlett 2016, 27, 1367–1370. [CrossRef]
34. Ivanova, O.A.; Budynina, E.M.; Skvortsov, D.A.; Limoge, M.; Bakin, A.V.; Chagarovskiy, A.O.; Trushkov, I.V.;
Mel’nikov, M.Y. A bioinspired route to indanes and cyclopentannulated hetarenes via (3+2)-cyclodimerization
of donor-acceptor cyclopropanes. Chem. Commun. 2013, 49, 11482–11484. [CrossRef] [PubMed]

Molecules 2020, 25, 5748
13 of 15
35. Zhu, M.; Liu, J.; Yu, J.; Chen, L.; Zhang, C.; Wang, L. AlCl3-Promoted Formal [2 + 3]-Cycloaddition
of 1,1-Cyclopropane Diesters with N-Benzylic Sulfonamides To Construct Highly Stereoselective Indane
Derivatives. Org. Lett. 2014, 16, 1856–1859. [CrossRef]
36. Ivanova, O.A.; Budynina, E.M.; Skvortsov, D.A.; Trushkov, I.V.; Mel’nikov, M.Y. Shortcut Approach to
Cyclopenta[b]indoles by [3 + 2] Cyclodimerization of Indole-Derived Cyclopropanes. Synlett 2014, 25, 2289–2292.
[CrossRef]
37. Dousset, M.; Parrain, J.-L.; Chouraqui, G. Intriguing Elecgtrophilic Reactivity of Donor–Acceptor
Cyclopropanes: Experimental and Theoretical Studies. Eur. J. Org. Chem. 2017, 2017, 5238–5245. [CrossRef]
38. Verma, K.; Banerjee, P. Synthesis of Indenopyridine Derivatives via MgI2-Promoted [2 + 4] Cycloaddition
Reaction of In-situ Generated 2-Styrylmalonate from Donor–Acceptor Cyclopropanes and Chalconimines.
Adv. Synth. Catal. 2018, 360, 3687–3692. [CrossRef]
39. Budynina, E.M.; Ivanov, K.L.; Chagarovskiy, A.O.; Rybakov, V.B.; Trushkov, I.V.; Mel’nikov, M.Y. From
Umpolung to Alternation: Modified Reactivity of Donor–Acceptor Cyclopropanes Towards Nucleophiles in
Reaction with Nitroalkanes. Chem. Eur. J. 2016, 22, 3692–3696. [CrossRef]
40. Zotova, M.A.; Novikov, R.A.; Shulishov, E.V.; Tomilov, Y.V. GaGl3-Mediated “Inverted” Formal
[3 + 2]-Cycloaddition of Donor–Acceptor Cyclopropanes to Allylic Systems. J. Org. Chem. 2018, 83, 8193–8207.
[CrossRef]
41. Ivanova, O.A.; Andronov, V.A.; Vasin, V.S.; Shumsky, A.N.; Rybakov, V.B.; Voskressensky, L.G.; Trushkov, I.V.
Expanding the Reactivity of Donor–Acceptor Cyclopropanes: Synthesis of Benzannulated Five-Membered
Heterocycles via Intramolecular Attack of a Pendant Nucleophilic Group. Org. Lett. 2018, 20, 7947–7952.
[CrossRef] [PubMed]
42. Novikov, R.A.; Borisov, D.D.; Tarasova, A.V.; Tkachev, Y.V.; Tomilov, Y.V. Three-Component
Gallium(III)-Promoted Addition of Halide Anions and Acetylenes to Donor–Acceptor Cyclopropanes.
Angew. Chem. Int. Ed. 2018, 57, 10293–10298. [CrossRef] [PubMed]
43. Borisova, I.A.; Tarasova, A.V.; Potapov, K.V.; Novikov, R.A.; Tomilov, Y.V. Reactions of donor-acceptor
cyclopropanes or benzylidenemalonate with benzyl azide by generating gallium trichloride 1,2-zwitterionic
complexes. Russ. Chem. Bull. 2019, 68, 1504–1509. [CrossRef]
44. Zotova, M.A.; Novikov, R.A.; Volodin, A.D.; Korlyukov, A.A.; Tkachev, Y.V.; Korolev, V.A.; Tomilov, Y.V.
Four-Membered Cycle Formation Challenge: GaCl3-Promoted Formal [2 + 2]-Cycloaddition of
Donor–Acceptor Cyclopropanes to Bicyclobutylidene. Eur. J. Org. Chem. 2019, 2019, 4207–4214. [CrossRef]
45. Belaya, M.A.; Knyazev, D.A.; Novikov, R.A.; Tomilov, Y.V. “Diels-Alder reaction” in the ionic version:
GaCl3-promoted formation of substituted cyclohexenes from donor-acceptor cyclopropanes and dienes.
Tetrahedron Lett. 2020, 61, 151990. [CrossRef]
46. Smith, R.J.; Nhu, D.; Clark, M.R.; Gai, S.; Lucas, N.T.; Hawkins, B.C. Synthesis of Chromones from
1,1-Diacylcyclopropanes: Toward the Synthesis of Bromophycoic Acid E. J. Org. Chem. 2017, 82, 5317–5327.
[CrossRef] [PubMed]
47. Dawande, S.G.; Harode, M.; Kalepu, J.; Katukojvala, S. Ag(I)-catalyzed intramolecular transannulation of
enynone tethered donor–acceptor cyclopropanes: A new synthesis of 2,3-dihydronaphtho [1,2-b]furans.
Chem. Commun. 2016, 52, 13699–13701. [CrossRef]
48. Kumar, P.; Dey, R.; Banerjee, P. Exploitation of Cyclopropane Carbaldehydes to Prins Cyclization: Quick
Access to (E)-Hexahydrooxonine and Octahydrocyclopenta[b]furan. Org. Lett. 2018, 20, 5163–5166. [CrossRef]
49. Novikov, R.A.; Tarasova, A.V.; Denisov, D.A.; Borisov, D.D.; Korolev, V.A.; Timofeev, V.P.; Tomilov, Y.V.
[4 + 2] Annulation of Donor–Acceptor Cyclopropanes with Acetylenes Using 1,2-Zwitterionic Reactivity.
J. Org. Chem. 2017, 82, 2724–2739. [CrossRef]
50. Ivanov, K.L.; Bezzubov, S.I.; Melnikov, M.Y.; Budynina, E.M. Donor-acceptor cyclopropanes as ortho-quinone
methide equivalents in formal (4 + 2)-cycloaddition to alkenes. Org. Biomol. Chem. 2018, 16, 3897–3909.
[CrossRef]
51. Ivanova, O.A.; Andronov, V.A.; Levina, I.I.; Chagarovskiy, A.O.; Voskressensky, L.G.; Trushkov, I.V.
Convenient Synthesis of Functionalized Cyclopropa[c]coumarin-1a-carboxylates. Molecules 2019, 24, 57.
[CrossRef] [PubMed]
52. Fuerst, D.E.; Stoltz, B.M.; Wood, J.L. Synthesis of C(3) Benzofuran-Derived Bisaryl Quaternary Centers:
Approaches to Diazonamide, A. Org. Lett. 2000, 2, 3521–3523. [CrossRef] [PubMed]

Molecules 2020, 25, 5748
14 of 15
53. Sun, L.-Q.; Chen, J.; Takaki, K.; Johnson, G.; Iben, L.; Mahle, C.D.; Ryan, E.; Xu, C. Design and synthesis
of benzoxazole derivatives as novel melatoninergic ligands. Bioorg. Med. Chem. Lett. 2004, 14, 1197–1200.
[CrossRef] [PubMed]
54. Terauchi, T.; Takemura, A.; Doko, T.; Yoshida, Y.; Tanaka, T.; Sorimachi, K.; Naoe, Y.; Beuckmann, C.; Kazuta, Y.
Cyclopropane Compound. U.S. Patent 2012/0095031A1, 19 April 2012.
55. Banothu, J.; Basavoju, S.; Bavantula, R. Pyridinium Ylide Assisted Highly Stereoselective One-Pot Synthesis
of trans-2-(4-Chlorobenzoyl)-3-aryl-spiro[cyclopropane-1,20-inden]-10,30-diones and Their Antimocrobial
and Nematicidal Activities. J. Heterocycl. Chem. 2015, 52, 853–860. [CrossRef]
56. Bravo, P.; Fronza, G.; Ticozzi, C. Oxygen Heterocycles by Sulphur Ylide Annulation. The Reaction of
Dimethylsulphoxonium Methylide on ortho-Hydroxybenzal Ketones: A Case of Annulation Leading to a
Mixture of Unexpected Oxygen Heterocycles. Gazz. Chim. Ital. 1984, 114, 93–102.
57. Murphy, W.S.; Wattanasin, S. Reactions of Aryl Cyclopropyl Ketones. A New Synthesis of Aryl Tetralones.
J. Chem. Soc. Perkin Trans. 1 1981, 2920–2926. [CrossRef]
58. Bravo, P.; Ticozzi, C. Oxygen Heterocycles by Sulphur Ylide Annulation: Reaction of o-Hydroxybenzalketones
with Dimethyloxosulphonium Methylide. Heterocycles 1981, 16, 713–716. [CrossRef]
59. Bravo, P.; Fronza, G.; Maggi, D.; Ticozzi, C. 2-(β-Hydroxy-β-methylsulfinylmethyl)-alkyl-2,3-dihydro-1-
benzofurans by Addition of the Whole Molecules of Dimethyloxosulfonium Methylide to
o-Hydroxybenzalketones. Tetrahedron Lett. 1977, 18, 1077–1078. [CrossRef]
60. Donelly, J.A.; Fox, M.J.; Hoey, J.G. Cyclopropyl Epoxides. Reactions of Some αβ-Dibromoketones with
Dimethyloxosulfoninum Methylide. J. Chem. Soc. Perkin Trans. 1 1979, 2629–2633. [CrossRef]
61. Gil, A.; Pabon, A.; Galiano, S.; Burguete, A.; Perez-Silanes, S.; Deharo, E.; Monge, A.; Aldana, I.
Synthesis, Biological Evaluation and Structure-Activity Relationships of New Quinoxaline Derivatives
as Anti-Plasmodium falciparum Agents. Molecules 2014, 19, 2166–2180. [CrossRef]
62. Paxton, R.J.; Taylor, R.J.K. Improved Dimethylsulfoxonim Methylide Cyclopropanation Procedures, Including
a Tandem Oxidation Variant. Synlett 2007, 633–637. [CrossRef]
63. Bastiansen, O.; Fritsch, F.N.; Hedberg, K. Least-Squares Refinement of Molecular Structures from
Gaseous Electron-Diffraction Sector Microphotometer Data. III. Refinement of Cyclopropane. Acta Cryst.
1964, 17, 538–543. [CrossRef]
64. Syam, S.; Abdelwahab, S.I.; Al-Mamary, M.A.; Mohan, S. Synthesis of Chalcones with Anticancer Activities.
Molecules 2012, 17, 6179–6195. [CrossRef] [PubMed]
65. Yin, G.; Fan, L.; Ren, T.; Zheng, C.; Tao, Q.; Wu, A.; She, N. Synthesis of functionalized
2-aryl-4-(indol-3-yl)-4H-chromenes via iodine-catalyzed domino Michael addition–intramolecular cyclization
reaction. Org. Biomol Chem. 2012, 10, 8877–8883. [CrossRef] [PubMed]
66. Kadayat, T.M.; Kim, M.J.; Nam, T.; Park, P.-H.; Lee, E.-S. Thieny/Furanyl-hydroxyphenylpropenones as
Inhibitors of LPS-induced ROS and NO Production in RAW 264.7 Marcophages, and Their Structure-Activity
Relationship Study. Bull. Korean Chem. Soc. 2014, 35, 2481–2486. [CrossRef]
67. Lee, Y.T.; Jang, Y.-J.; Syu, S.; Chou, S.-C.; Lee, C.-J.; Lin, W. Preparation of functional benzofurans and indoles
via chemoselective intramolecular Wittig reactions. Chem. Commun. 2012, 48, 8135–8137. [CrossRef]
68. Saha, P.; Biswas, A.; Molleti, N.; Singh, V.K. Enantioselective Synthesis of Highly Substituted Chromans via
the oxa-Michael–Michael Cascade Reaction with a Bifunctional Catalyst. J. Org. Chem. 2015, 80, 11115–11122.
[CrossRef]
69. Varano, F.; Catarzi, D.; Colotta, V.; Cecchi, L.; Filacchioni, G.; Galli, A.; Costagli, C. Structure-Activity
Relationship Studies of Novel Pyrazolo[1,5-c][1,3]benzoxazines: Synthesis and Benzodiazepine Receptor
Affinity. Arch. Pharm. 1996, 329, 529–534. [CrossRef]

Molecules 2020, 25, 5748
15 of 15
70. Kalogiros, C.; Hadjiarapoglu, L.P. Facile preparaton of bicyclo[2.2.2]octenone derivatives via Diels-Alder
cycloadditions of in situ-generated masked o-benzoquinones. Tetrahedron 2011, 67, 3216–3225. [CrossRef]
71. Tatsuzaki, J.; Bastow, K.F.; Nakagawa-Goto, K.; Nakamura, S.; Itokawa, H.; Lee, K.-H. Dehydrozingerone,
Chalcone, and Isoeugenol Analogues as in Vitro Anticancer Agents. J. Nat. Prod. 2006, 69, 1445–1449.
[CrossRef]
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