Catalytic asymmetric synthesis of 1,1-disubstituted tetrahydro-β-carbolines by phase-transfer catalyzed alkylations
作者:Seiji Shirakawa、Kun Liu、Hironobu Ito、Keiji Maruoka
DOI:10.1039/c0cc04447d
日期:——
Efficient catalytic asymmetric synthesis of 1,1-disubstituted tetrahydro-beta-carbolines has been achieved via asymmetric alkylation of 1-cyanotetrahydro-beta-carbolines using a binaphthyl-modified N-spiro-type chiral phase-transfer catalyst. This is a valuable example of hitherto difficult highly enantioselective alkylations at alpha-carbon of the cyano group under phase-transfer conditions.
通过使用双萘基修饰的N-螺环型手性相转移催化剂对1-氰基四氢-β-咔啉进行不对称烷基化,已经实现了1,1-二取代的四氢-β-咔啉的高效催化不对称合成。这是迄今为止在相转移条件下氰基的α-碳上难以进行的高度对映选择性烷基化的有价值的实例。