Abstract
The Lewis acid-mediated addition of the titanium enolate from the pivaloyl-protected (S) N-glycolyl-4-isopropyl-1,3-thiazolidine-2-thione to glycals affords the corresponding syn C-α-glycosides in high yields and excellent diastereomeric ratios. Further removal of the chiral auxiliary permits access to enantiomerically pure C1′-pivaloyloxy pyrans in a straightforward manner.
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