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Natural antimycin A3 (1A) and its diastereomer (1B) were synthesized. By the syntheses, the correlations between configurations of the enantiomeric 2-butyl-4-hydroxy-3-isovaleryloxypentanoic acids present in the dilactone moieties of 1A and 1B, and those of natural (+)blastmycinone (+)7a and its enantiomer (−)7a were confirmed. The absolute configuration of 1B was also determined.
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Kinoshita et al. (1973) studied this question.
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