N-[1-4-Methoxyphenyl-2-phenyl-2,2-dichloroethyl]arenesulfonamides are formed in reaction of N-(2-phenyl,-2.2-dichloroethylidene)-4-chlorobenzenesulfonamide and N-(2-phenyl-2,2-dichloroethylidene)-4-methylbenzenesulfonamide with anisole catalyzed by boron trifluoride etherate, and in reaction of anisole with 1,1-di(arenesulfonamido)-2-phenyl-2,2,-dichloroethanes in the presence of concentrated sulfuric acid.
N-(2,2-Dichloro-2-phenylethylidene)arenesulfonamides in reactions with secondary amines
作者:I. B. Rozentsveig、G. N. Rozentsveig、A. N. Mirskova、K. A. Chernyshev、L. B. Krivdin、G. G. Levkovskaya
DOI:10.1134/s1070363208070141
日期:2008.7
N-(2,2-Dichloro-2-phenylethylidene)arenesulfonamides were synthesized by a modified procedure, and their reactions with secondary amines were studied for the first time. Reactions of imines with dialkylamines proceed at room temperature to afford alpha,alpha-dichloromethylbenzene and N,N-dialkyl-N'-(arenesulfonyl)formamidines arising from the haloform cleavage of the initially formed unstable N-(1-dialkylamino-2,2-dichloro-2-phenylethyl)arenesulfonamides. When the reaction is carried out upon cooling to 0 degrees C, the products of the nucleophilic addition of secondary amines to azomethines, N-(1-dialkylamino-2,2-dichloro-2-phenylethyl) are formed in yields of no higher than 5%. Nonempirical calculations of C-13-H-1 spin-spin coupling constants and their experimental measurements for the series of the synthesized N-arenesulfonamides were performed to show that these compounds exist in solutions exclusively as E isomers. Preferable conformations of the investigated compounds and the relative energies of their E and Z isomers in the gas phase were determined by quantum-chemical calculations at the MP2/6-311G** level of theory. The NMR spectral data revealed restricted rotation of the N,N-dialkylamino group about the partially double C-NAlk(2) bond in the molecules of N-arenesulfonylformamidines.
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作者:T. I. Drozdova、A. N. Mirskova
DOI:10.1023/a:1012457430488
日期:——
N-[1-4-Methoxyphenyl-2-phenyl-2,2-dichloroethyl]arenesulfonamides are formed in reaction of N-(2-phenyl,-2.2-dichloroethylidene)-4-chlorobenzenesulfonamide and N-(2-phenyl-2,2-dichloroethylidene)-4-methylbenzenesulfonamide with anisole catalyzed by boron trifluoride etherate, and in reaction of anisole with 1,1-di(arenesulfonamido)-2-phenyl-2,2,-dichloroethanes in the presence of concentrated sulfuric acid.
Drozdova, T. I.; Levkovskaya, G. G.; Mirskova, A. N., Journal of Organic Chemistry USSR (English Translation), 1992, vol. 28, # 6.2, p. 968 - 972
作者:Drozdova, T. I.、Levkovskaya, G. G.、Mirskova, A. N.