Epoxidation of C-branched glycals: unexpected stereochemical results and their theoretical rationale Original Research Article

This paper describes the synthesis of C-3 methyl-branched glycosides by epoxidation of partially unblocked l-configured glycals. The stereochemical result depends on the orientation of the allylic hydroxyl group. A theoretical explanation is presented, based on the conformational preferences of the respective glycal half-chair conformations that were estimated by applying the BP density functional and a valence triple-ζ basis set.