One-pot Dess-Martin periodinane-mediated oxidative deprotection and olefination of trimethylsilyl-protected pyranosides and pyranoses.

The selective functionalization of carbohydrates provides a powerful method for introducing structural complexity, allowing access to unique drug scaffolds with distinctive pharmaceutical profiles. Herein, we describe an efficient and selective carbon-carbon bond forming reaction of a variety of common trimethylsilyl-protected pyranosides and pyranoses at C-6 using a one-pot Dess-Martin periodinane-mediated oxidation deprotection. This is followed by addition of stabilized and non-stabilized ylides to generate alkenoate carbohydrates and related analogs in good to moderate yields. We also report on the rapid deprotection of the remaining trimethylsilyl ether groups in near quantitative yields using an acidic resin-mediated ethanolysis.