One-pot Synthesis of Cyclopropane Derivatives with a Cis:Trans Stereoselectivity by Wittig Olefination-Sulfur Ylide Cyclopropanation Sequence
作者:Wenhua Huang、Lai-Ling Wang
DOI:10.3184/174751913x13692098347208
日期:2013.6
Cyclopropane derivatives were synthesised in one pot from aromatic aldehydes, phenacyltriphenylphosphonium bromide, and S-phenacylthiolanium bromide by a Wittig olefination-sulfur ylide cyclopropanation sequence. When Cs2CO3 was used as the base and CH3CN/water (8:2, v/v) as the solvent, the major product was the cis-1,2-dibenzoyl cyclopropane. In contrast, when using DBU as the base and MeOH as the
环丙烷衍生物是通过 Wittig 烯化-硫叶立德环丙烷化序列从芳香醛、苯甲酰三苯基溴化鏻和 S-苯甲酰硫基溴化鏻一锅合成的。当使用 Cs2CO3 作为碱和 CH3CN/水 (8:2, v/v) 作为溶剂时,主要产物是顺式 1,2-二苯甲酰基环丙烷。相反,当使用 DBU 作为碱和 MeOH 作为溶剂时,主要产物是反式二苯甲酰基环丙烷。在某些情况下,通过简单过滤以高纯度和高产率获得主要异构体。