De novo synthesis of galacto-pyranosides and 4-deoxy-pyrano-lactones via an iterative use of Sharpless asymmetric dihydroxylation

ORGN 168

Md. Moinuddin Ahmed, Dennis J Tomcik, and George A. O'Doherty. C. Eugene Bennett Department of Chemistry, West Virginia University, 284 Prospect Street, 217 Clark Hall of Chemistry, WVU, Morgantown, WV 26506-6045
Continuing our ongoing interest in carbohydrate synthesis by means of asymmetric catalysis, the de-novo asymmetric synthesis of several galacto-pyranosides and 4-deoxy-pyrano-lactones from dienoates will be described. Our synthesis relies on a regioselective Sharpless asymmetric dihydroxylation followed by a subsequent matched diastereoselective Sharpless asymmetric dihydroxylation to establish the absolute and relative galacto-stereochemistry.