stereoselective synthesis of (−)-β-conhydrine is achieved. Stereoselective Grignard reaction of (R)-2,3-O-cyclohexylidine glyceraldehyde with ethyl magnesium bromide, chelation controlled stereoselective Grignard reaction of allyl imine derivative with allyl magnesium bromide, and ring-closing metathesis (RCM) of the diallyl product provides (−)-β-conhydrine in high yield.
(-)-β-conhydrine的新型立体选择性合成得以实现。(R)-2,3- O-环己基
吡啶甘油醛与
乙基溴化镁的立体选择性格氏反应,烯丙基
亚胺衍
生物与
烯丙基溴化镁的螯合控制立体选择性格氏反应,以及
二烯丙基产物的闭环易位(RCM)提供)-β-瓜
氨酸,收率高。