New access to chiral syn-α-Chlorohydrins and cis-vinyloxiranes through chloroallyboration
作者:Seetharaman Jayaraman、Shaojing Hu、Allan C Oehlschlager
DOI:10.1016/0040-4039(95)00928-6
日期:1995.7
A new method to generate chiral cis-vinyloxiranes from readily available starting materials is reported. (α-Chloroallyl)lithium, generated in situ from LiN(c-Hex)2 and allyl chloride at −95°C, reacts with (−)-β-methoxydiisopinocampheylborane, dIpc2BOMe, to give an ate complex. Treatment of this with BF3·OEt2 leads to the reagent, [(Z)-γ-chloroallyl]BIpc2. Chloroallylboration of aldehydes using the
报道了一种从容易获得的起始原料中生成手性顺式-乙烯基氧杂环丁烷的新方法。在-95°C下由LiN(c- Hex)2和烯丙基氯原位生成的(α-氯代烯丙基)锂与(-)- β-甲氧基二异opinocampheylborane,d Ipc 2 BOMe反应,得到ate配合物。这种治疗BF 3 ·OET 2个通向试剂,[(Z) - γ -chloroallyl] BIPC 2。使用后者试剂随后消除手性辅助剂的醛类的Chloroallylboration提供顺式- α-氯醇的高de(≥94%)和ee(90–99%)。碱诱导的氯醇环化作用可提供手性顺式-乙烯基环氧乙烷。