Selective and practical asymmetric syntheses of (+)-decursinol (1) and (+)-
trans-decursidinol (2) have been achieved using naturally occurring umbelli
ferone, demethylsuberosin, and xanthyletin as the synthetic intermediates.
The absolute stereochemistry was established in the late stage of synthesis
by employing Jacobsen's enantioselective epoxidation conditions. (C) 2001
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