Abstract
Abstract Semi-pinacol cyclization of compound 8 , having an acetal and an aldehyde substituent, was achieved by employing SmI2 and BF3·OEt2, leading to the highly stereoselective formation of cyclized product 9 . The vicinal diol in 9 is discriminated, so as to allow selective glycosylation for the synthesis of pradimicin–benanomicin antibiotics.
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