Selective synthesis of allenic and acetylenic derivatives via pentaorganylstiboranes
摘要:
Allenyltetrabutylstiborane (3), formed from allenyltributylstibonium bromide (2) and butylmagnesium bromide, reacted with aldehydes to give homopropargylic alcohols (4) exclusively in excellent yields, while 2-butynyltetrabutylstiborane (6), formed from 2-butynyltributylstibonium bromide (5) and butylmagnesium bromide, reacted with aldehydes to give allenic alcohols (7) preferentially.