Ring opening of 2,3-, 3,4-, and 4,6-O-benzylidene acetals of pyranosides by photobromination with bromotrichloromethane
Abstract
2,3- 3,4-, and 4,6-O-Benzylidene pyranoside derivatives on photobromination in bromotrichloromethane yield bromo-deoxy-pyranoside benzoates regio- and stereo-specifically which, for the acyl derivatives of the 2,3- and 3,4-acetals, is superior to their reaction with N-bromosuccinimide.