Stereoselective template-directed C-glycosidation. Synthesis of bicyclic ketooxetanes via intramolecular cyclization reactions of (2-pyridylthio)glycosidic silyl enol ethers
Abstract
Bicyclic ketooxetanes 5a, 5b and 8 are formed with excellent stereoselectivity on treatment of (2-pyridylthio)glycosidic silyl enol ethers 1a, 1b and 2 with silver(I) trifluoromethanesulfonate.