Asymmetric [2,3]-Wittig Rearrangement Induced by a Chiral Carbanion Whose Chirality Was Transferred from an Epoxide
作者:Michiko Sasaki、Mariko Higashi、Hyuma Masu、Kentaro Yamaguchi、Kei Takeda
DOI:10.1021/ol052544h
日期:2005.12.1
[reaction: see text] The enantioselective [2,3]-Wittig rearrangement of 1-allyloxy-1-(naphthalen-2-yl)-4-siloxy-2,4-pentadienyl anion, derived from optically enriched 4,5-epoxy-1-(naphthalen-2-yl)-5-silyl-2-pentenyl allyl ether via a base-induced ring opening of the epoxide followed by Brook rearrangement, has been studied. The chirality of the epoxide was transferred to the alcohols in up to 97% ee, depending
[反应:参见正文]由光学富集的4,5-衍生的1-烯丙氧基-1-(萘-2-基)-4-甲硅烷氧基-2,4-戊二烯基阴离子的对映选择性[2,3] -Wittig重排。已经研究了通过碱引起的环氧化物的开环后进行布鲁克重排的环氧-1-(萘-2-基)-5-甲硅烷基-2-戊烯基烯丙基醚。取决于所使用的溶剂,环氧化物的手性以高达97%ee的量转移到醇中。在高于室温的温度下于1,4-二恶烷中获得最佳结果。