Reaction of alkyl-3-nitro-and-3-bromo-3-nitroacrylates with 2-(2-nitroethenyl)furan
作者:V. M. Berestovitskaya、N. A. Anisimova、O. N. Kataeva、G. A. Berkova、A. Jager
DOI:10.1134/s1070363208050216
日期:2008.5
The diene condensation of beta-nitro and beta-bromo-beta-nitroacrylates with 2-(2-nitroethenyl)furan as 1,3-diene leads to a mixture of regioisomeric tetrahydrobenzofurans transforming under the reaction conditions into benzofurancarboxylates due to the easy dehydrohalogenation, denitration, and dehydration. In the case of a gem-bromonitroacrylate reaction takes two routes: diene synthesis and alkylation of the furan ring, the latter process prevailing. The structure of products formed was established by spectral methods. The investigation of geometry of 2-(1-methoxycarbonyl-2-nitroethenyl)-5-(2-nitroethenyl)furan by XRD analysis showed that its vinyl fragments have the coplanar chelate-like structure with the cisoid orientation of the CO2Me and NO2 groups. The ester group deviates from the plane of the the carbon-carbon multiple bond.
Synthesis and structure of 2-(nitromethylene)-2H-1,4-benzothiazin-3(4H)-one
作者:V. M. Berestovitskaya、V. A. Tafeenko、S. V. Makarenko、K. D. Sadikov、I. V. Chernyshev
DOI:10.1134/s1070363206010269
日期:2006.1
A new representative of benzothiazines, (2Z)-2-(nitromethylene)-2H-1,4-benzothiazin-3(4H)-one, was synthesized, and its structure was studied. According to H-1 NMR, IR, and UV spectral and X-ray diffraction data, the molecules are planar highly conjugated structures that exist in crystal as centrosymmetric dimers; the latter form layers overlapping with each other and held together by strong pi-pi interaction between the carbonyl groups of neighboring layers.
α-Indolyl-β-nitroacrylates. Synthesis and structure
作者:V. M. Berestovitskaya、S. V. Makarenko、A. S. Smirnov、A. T. Gubaidullin、I. A. Litvinov、A. I. Pekki、Z. M. Sarkisyan
DOI:10.1134/s1070363208050228
日期:2008.5
A one-pot procedure has been developed for the synthesis of alpha-indolyl-beta-nitroacrylates by reaction of beta-bromo-beta-nitroacrilates with indole and substituted indoles. All indolylnitroacrilates thus obtained have Z configuration of the double bond. According to the X-ray diffraction data, ethyl 2-(1-methyl-1H-indol-3-yl)-3-nitroacrylate is characterized by s-trans conformation of the double C=C bond and indole ring; its crystal packing involves intermolecular hydrogen bonds C-H center dot center dot center dot O and C-H center dot center dot center dot pi with formation of centrosymmetric dimers which give rise to bilayer supramolecular structures.
3-nitro- and 3-bromo-3-nitroacrylates in reactions with phenyl azide
作者:V. M. Berestovitskaya、N. A. Anisimova、O. N. Kataeva、N. G. Makarova、G. A. Berkova
DOI:10.1134/s1070363207090113
日期:2007.9
1,3-Dipolar cycloaddition of alkyl 3-nitro-and 3-bromo-3-nitroacrylates to phenyl azide gives regioisomeric alkyl 5(4)-nitro-1-phenyl-4,5-dihydro-1H-1,2,3-triazole-4(5)-carboxylates, the corresponding triazoles both with and without nitro group, and alkyl 3-nitro-1-phenylaziridine-2-carboxylates. Nitrotriazolecarboxylates were found to lose the ester moiety during chromatographic separation of the products on aluminum oxide. The structure of the products was determined on the basis of IR, H-1 NMR, and X-ray diffraction data.
Synthesis of 2-morpholino(piperidino)-3-nitroacrylates
作者:K. D. Sadikov、A. S. Smirnov、S. V. Makarenko、V. M. Berestovitskaya