An Unusual dependency of counterion during wittig methylenation of bis-heteroaryl ketones
作者:Chakrapani Subramanyam
DOI:10.1016/0040-4039(95)02016-i
日期:1995.12
Attempted Wittig methylenation of some bis-heteroaromatic ketones (8, 11 and 13) using MeP(+)Ph(3)Br and n-BuLi gave none of the desired olefin. However, when KtBuO was used as the base for generation of the ylide, efficient olefination of these ketones was observed. A possible mechanistic pathway for this interesting but unprecedented observation is proposed.