Reaction of N-sulfonyl-1,4-benzoquinone imines with enamines
作者:S. A. Konovalova、A. P. Avdeenko、V. V. Pirozhenko、A. L. Yusina、G. V. Palamarchuk、S. V. Shishkina
DOI:10.1134/s1070428017040054
日期:2017.4
4-benzoquinone imine reacted with enamines to give 1,4-addition products and products of their subsequent cyclization, substituted 5-aminobenzofurans and 5-aminoindoles, depending on the solvent nature, electron-withdrawing power of the substituent on the quinone imine nitrogen atom, and enamine structure. The presence of strong electron-withdrawing trifluoromethanesulfonyl group on the quinone imine nitrogen
Reaction of N-sulfonyl derivatives of 1,4-benzoquinone monoimine with substituted hydrazines
作者:S. A. Konovalova、A. P. Avdeenko、S. A. Goncharova、V. V. D’yakonenko、S. V. Shishkina
DOI:10.1134/s1070428016050055
日期:2016.5
Reaction direction of N-sulfonyl derivatives of 1,4-benzoquinone monoimine with substituted hydrazines depends on the redox potential of the quinone imine and on the basicity of the hydrazine. Aryl (alkyl)hydrazines of high basicity favor the reduction of quinone monoimine. In reactions with less basic aroylhydrazones N'-(4-oxocyclohexa-2,5-dienylidene)aroylhydrazides were obtained only from the alkylsubstituted
Activated sterically strained C=N bond in N-substituted p-quinone mono- and diimines: XIII. Reactions of N-alkyl(aryl, trifluoromethyl)sulfonyl-, N-arylsulfinyl- and N-arylsulfanyl-1,4-benzoquinone monoimines with alcohols
作者:A. P. Avdeenko、S. A. Konovalova、O. N. Mikhailichenko、A. A. Santalova、G. V. Palamarchuk、O. V. Shishkin
DOI:10.1134/s107042801205003x
日期:2012.5
Steric strains arising between the substituent atoms at nitrogen (S, SO, or SO2) and the methyl group located in positions 3 or 5 of the quinoid ring of 3,5-dimethyl-substituted quinone monoimines lead to the increased angle C=N-S. As a result in these quinone monoimines the reactions of 1,2-addition become thermodynamically possible since the formation of quinolide structures with the sp(3)-hybridized carbon atom removes the steric strain.
Synthesis of 5-substituted 2,3-dihydrobenzofurans in a one-pot oxidation/cyclization reaction
作者:Fabien Baragona、Thierry Lomberget、Christian Duchamp、Natali Henriques、Eugenio Lo Piccolo、Patrizia Diana、Alessandra Montalbano、Roland Barret
DOI:10.1016/j.tet.2011.09.020
日期:2011.11
Variously substituted 2,3-dihydrobenzofurans have been synthesized according :o a sequential one-pot oxidation/cyclization procedure between para-aminophenol derivatives and an azadiene. (C) 2011 Elsevier Ltd. All rights reserved.
Avdeenko, Russian Journal of Organic Chemistry, 2000, vol. 36, # 4, p. 522 - 527