New synthesis of allylidenecyclobutanes by the reaction of cyclobutylmagnesium carbenoids with vinyl sulfones
作者:Masashi Ishigaki、Mio Inumaru、Tsuyoshi Satoh
DOI:10.1016/j.tetlet.2011.08.018
日期:2011.10
The reaction of cyclobutylmagnesium carbenoids, which were generated from 1-chlorocyclobutyl p-tolyl sulfoxides with EtMgCl via the sulfoxide–magnesium exchange reaction at low temperature, with carbanions derived from vinyl sulfones with n-BuLi or LDA resulted in the formation of allylidenecyclobutanes in moderate to good yields. The actual reactive species of the sulfones in this reaction were proved
Synthesis of small ring-containing conjugated dienes via the coupling reaction of cyclopropyl- and cyclobutylmagnesium carbenoids with α-sulfonylallyllithiums
synthesized via the coupling reaction of cyclopropyl- and cyclobutylmagnesium carbenoids with α-sulfonylallyllithiums. Small ring cycloalkylmagnesium carbenoids were generated from aryl 1-chlorocycloalkyl sulfoxides and a Grignard reagent, and the resultant magnesium carbenoids were reacted with α-sulfonylallyllithiums, which were prepared via the deprotonation of p-tolyl vinyl sulfones or allyl p-tolyl