Preparation of new chiral bisoxazoline ligands for the catalytic asymmetric intramolecular cyclopropanation of α-diazo-β-keto phenyl sulfone to afford a useful bicyclo[3.1.0]hexane derivative
作者:Takashi Sawada、Masahisa Nakada
DOI:10.1016/j.tetasy.2012.02.021
日期:2012.3
preparation of novel chiral bisoxazoline ligands with various substituents at the bisoxazoline linkage, for use in the catalytic asymmetricintramolecular cyclopropanation (CAIMCP) of α-diazo-β-keto phenyl-5-hexenyl sulfone to afford a simple, but useful, bicyclo[3.1.0]hexane derivative. The enantioselectivity of the CAIMCP of α-diazo-β-keto phenyl-5-hexenyl sulfone was improved and a product with 84% ee was