Abstract
The ( R)- and ( S)-butanolides 7 and 9 are synthesized via asymmetric epoxidation from geraniol; the ( R)-butanolide 7 is also obtained from ( S)- citramalic acid. The butanolides 7 and 9 are valuable reference compounds for the determination of absolute stereochemistry in fungal and plant pre-anthraquinones.
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