Cyanation of nucleophilic alkynes: easy approach to element-substituted α-cyanoenamines
作者:Nikolai V. Lukashev、Alexei V. Kazantsev、Anatolii A. Borisenko、Irina P. Beletskaya
DOI:10.1016/s0040-4020(01)01056-0
日期:2001.12
The reactions of trimethylsilyl cyanide and tributyltin cyanide with ynamines proceeds as a regioselective syn-addition and provide previously unknown beta -elementosubstituted alpha -cyanoenamines as pure E-isomers. The reaction of cyanogen bromide with ynamines as well the hydrocyanation of phosphorus substituted N,N-diethylaminoacetylenes by acetone cyanohydrin also proceeds as regioselective syn-addition, though the initially formed Z-isomers undergo an easy transformation into E-isomers. Cross-coupling reaction of beta -bromo-otcyanocnamine with arylboronic acids were shown to be an easy and convenient approach to alpha -dialkylaminosubstituted cynnamonitriles. (C) 2001 Elsevier Science Ltd. All fights reserved.