Bromination of fully protected 1,2-O-benzylidenated pyranoses with bromotrichloromethane and u.v. light or N-bromosuccinimide gives 2-O-benzoyl glycosyl bromides in good yields, which may be converted in situ to glycosides and disaccharides.
P. M. Collins, A. Manro, E. C. Opara-Mottah and M. H. Ali, J. Chem. Soc., Chem. Commun., 1988, 272 DOI: 10.1039/C39880000272
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