Two enantio couples of terminal C-glycopyranosyl a-amino acids, namely the aminopyranuronic acids L-9, D-9 and L-10, D-10, have been synthesized from the serine- derived pair L-2, D-2 by exploiting enantiomerically pure butenolide intermediates 3 and 4. The key synthetic steps involved the sequential antiselective cis dihydroxylation of the butenolide double bond and the clean furanose-to-pyranose ring expansion to construct ...
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![tert-butyl (4R)-4-[(R)-hydroxy-[(2R)-5-oxo-2H-furan-2-yl]methyl]-2,2-dimethyl-1,3-oxazolidine-3-carboxylate结构式](https://image.chemsrc.com/caspic/457/127997-05-1.png)
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