Superarming the S-Benzoxazolyl Glycosyl Donors by Simple 2-O-Benzoyl-3,4,6-tri-O-benzyl Protection

Abstract
The strategic placement of common protecting groups led to the discovery of a new method for “superarming” glycosyl donors. Conceptualized from our previous studies on the O-2/O-5 Cooperative Effect, it was determined that S-benzoxazolyl glycosyl donors possessing both a participating moiety at C-2 and an electronically armed lone pair at O-5, such as the superarmed glycosyl donor shown above, were exceptionally reactive.