Facile Bromination of O-Benzylidene Sugar and THP Ethers with NBS in Chloroform in the Presence of AIBN
摘要:
N-Bromosuccinimide in chloroform in the presence of a catalytic amount of AIBN is found to cleave O-benzylidene sugar into bromobenzoate in efficient manner. THP-ethers were cleaved into bromides and bromo-esters in high yield.
Ring opening of 2,3-, 3,4-, and 4,6-O-benzylidene acetals of pyranosides by photobromination with bromotrichloromethane
作者:Jasbir S. Chana、Peter M. Collins、Farnoosh Farnia、David J. Peacock
DOI:10.1039/c39880000094
日期:——
2,3-3,4-, and 4,6-O-Benzylidenepyranoside 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.