1-naphthylpropargyl ether group: A readily cleaved and sterically minimal protecting system for stereoselective glycosylation

[GRAPHICS] The (1-naphthyl) propargyl group is introduced as a sterically unobtrusive alcohol protecting group that is cleaved in a single step by exposure to dichlorodicyanoquinone in wet dichloromethane. In conjunction with the 4,6-O-benzylidene protecting group, and the use of the sulfoxide glycosylation method, 3-O-naphthylpropargyl-protected mannosyl donors are extremely beta-selective.