Transmetallation of (S)-4-benzyloxy-2-pentenyl(tributyl)stannane (1) using tin(IV) chloride generates an allyltin trichloride which reacts in situ with aldehydes to give 1-substituted syn-(3Z)-5-benzyloxyhexenols with excellent stereoselectivity. With chiral aldehydes, the stereoselectivity of the reaction is dominated by the reagent, except for 2-alkoxyaldehydes which show matching and mismatching consistent with preferred Felkin-Anh diastereofacial selectivity.
使用三
氯化锡对(S)-4-苄氧基-
2-戊烯基(三丁基)
锡烷(1)进行
金属转移反应,生成了烯丙基
锡三
氯化物,该物质能够原位与醛反应,以优异的立体选择性生成1-取代的syn-(3Z)-5-苄氧基己烯醇。对于手性醛,反应的立体选择性主要受试剂控制,但对于2-烷氧基醛,其匹配和不匹配的情况与优选的Felkin-Anh非对映面选择性一致。