New Anionic Cyclization of 4- and 5-Alkynylamines: Synthesis of 2-Benzylidene Pyrrolidines and Piperidines
作者:Masao Tokuda、Hirotake Fujita、Makoto Nitta、Hiroshi Suginome
DOI:10.3987/com-95-s50
日期:——
Treatment of 4- and 5-alkynylamines with 0.5-1.2 equiv. of butyllithium brought about a facile anionic cyclization, giving the corresponding enamine pyrrolidines and piperidines having an exo double bond in high yields. Treatment of 4-alkynamides with lithium aluminum hydride also gave the similar enamine pyrrolidines in high yields.