Total synthesis of acarbose and adiposin-2

Abstract
The first complete synthesis of acarbose (1a), the pseudotetrasaccharidic α-amylase inhibitor, is reported: coupling of the protected (+)-valienamine (16) and the epoxide (9) derived from 1″,6″-anhydromaltotriose (3), followed by deprotection; likewise, adiposin-2 (2a), the 6′-hydroxy analogue of (1a), has also been synthesised.

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