Diastereoselective Aldol Addition Using Boron Trichloride or Alkoxydichloroborane
作者:Hak-Fun Chow、Dieter Seebach
DOI:10.1002/hlca.19860690309
日期:1986.5.7
Under carefully controlled conditions, boron trichloride or alkoxydichloroborane/ethyldiisopropylamine in CH2Cl2 can be used to effect diastereoselective aldol additions of ethyl ketones to saturated, α, β-unsaturated, or aromatic aldehydes. The CC bond formation takes place with relative topicity ul (‘syn,’ configuration of the aldols), in selectivities ranging from 90 to 99% ds (Tables 1–3). Mechanistic
在精心控制的条件下,CH 2 Cl 2中的三氯化硼或烷氧基二氯硼烷/乙基二异丙胺可用于将乙基酮进行非对映选择性的醛醇缩合,形成饱和,α,β-不饱和或芳族醛。CC键的形成具有相对局部性ul(醛醇的“ syn ”构型),选择性范围为90%到99%ds(表1-3)。讨论了反应的机械方面。