[EN] CATALYTIC ASYMMETRIC SYNTHESIS OF PRIMARY AMINES VIA BORANE REDUCTION OF OXIME ETHERS USING SPIROBORATE ESTERS [FR] SYNTHÈSE ASYMÉTRIQUE CATALYTIQUE D'AMINES PRIMAIRES PAR RÉDUCTION AU BORANE D'ÉTHERS D'OXIME AU MOYEN D'ESTERS DE SPIROBORATE
[EN] CATALYTIC ASYMMETRIC SYNTHESIS OF PRIMARY AMINES VIA BORANE REDUCTION OF OXIME ETHERS USING SPIROBORATE ESTERS<br/>[FR] SYNTHÈSE ASYMÉTRIQUE CATALYTIQUE D'AMINES PRIMAIRES PAR RÉDUCTION AU BORANE D'ÉTHERS D'OXIME AU MOYEN D'ESTERS DE SPIROBORATE
申请人:INTELLECTUAL PROPERTY AND TECH
公开号:WO2008027740A3
公开(公告)日:2008-05-22
Highly Enantioselective Borane Reduction of Heteroaryl and Heterocyclic Ketoxime Ethers Catalyzed by Novel Spiroborate Ester Derived from Diphenylvalinol: Application to the Synthesis of Nicotine Analogues
作者:Kun Huang、Francisco G. Merced、Margarita Ortiz-Marciales、Héctor J. Meléndez、Wildeliz Correa、Melvin De Jesús
DOI:10.1021/jo800204n
日期:2008.6.1
An asymmetric synthesis for the preparation of nonracemic amines bearing heterocyclic and heteroaromatic rings is described. A variety of important enantiopure thionyl and arylalkyl primary amines were afforded by the borane-mediated enantioselective reduction of O-benzyl ketoximes using 10% of catalyst 10 derived from (S)-diphenylvalinol and ethylene glycol with excellent enantioselectivity, in up
描述了制备带有杂环和杂芳环的非外消旋胺的不对称合成。使用 10%衍生自 ( S )-二苯基缬氨醇和乙二醇的催化剂10 ,通过硼烷介导的对映选择性还原O-苄基酮肟,得到各种重要的对映纯亚硫酰基和芳烷基伯胺,具有优异的对映选择性,高达 99% ee 。首次不对称还原 3- 和 4-吡啶基衍生的O-苄基酮肟醚的最佳条件是在 10 °C 下在二恶烷中使用 30% 的催化负载量实现的。( S ) -N-乙基降烟碱 ( 3 ) 也由 TIPS 保护的 ( S )-2-氨基-2-吡啶乙醇在 97% ee 中成功合成。