The enantioselective aminocatalytic α-chlorination of aldehydes is a challenging reaction because of its tendency to proceed through neutral intermediates in unselective pathways. Herein we report the rational shift to a highly selective reaction pathway involving charged intermediates using hexafluoroisopropanol as solvent. This change in mechanism has enabled us to match and improve upon the yields
The generation and trapping of enantiopure bromonium ions
作者:D. Christopher Braddock、Stephen A. Hermitage、Lilian Kwok、Rebecca Pouwer、Joanna M. Redmond、Andrew J. P. White
DOI:10.1039/b816914d
日期:——
Enantiopure bromoniumions may be generated from enantiopure bromohydrins and derivatives, they can be trapped with an in situ nucleophile to give enantiomerically pure products.
METHOD FOR SYNTHESIS OF HALOPYRIDYL-ACYCLOPENTANE DERIVATIVE AND INTERMEDIATE THEREOF
申请人:——
公开号:US20020010339A1
公开(公告)日:2002-01-24
The present invention relates to a method for synthesis of an optically active halopyridyl-azacyclo-pentane derivative and the intermediate thereof which comprises preparing an optically active allene-1,3-dicarboxylic acid ester derivative from an optically active acetonedicarboxylic acid ester derivative and then proceeding through a 7-azabicyclo[2.2.1]heptane derivative to obtain the objective product.