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19 steps in the longest linear sequence are required in the 27 step total synthesis of gephyronic acid. A key step is a diastereodifferentiating Mukaiyama aldol reaction of an aldehyde and an enolsilane (see picture, PG: protecting group). The strongly cytotoxic target compound is a structural relative of the polyketide tedanolide and was isolated from the myxobacterium Archangium gephyra.
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Anderl et al. (2010) studied this question.
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