The preparation of several of the entitled epoxides is described in two steps starting from 2-methyl 2-amino but 3-yne, the first one being the reaction of the lithium acetylide with a α-chloroaldehyde or ketone. In certain cases, this reaction Is highly diastereoselectlve giving 96% of the R∗S∗ diastereoisomer.
从2-甲基2-氨基但3-炔基开始的两个步骤描述了几种标题环氧化物的制备,第一个步骤是乙炔化锂与α-氯醛或酮的反应。在某些情况下,该反应是高度非对映选择性的,可提供96%的R * S *非对映异构体。