An efficient total synthesis of integric acid is described starting from the Wieland-Miescher ketone. Key steps involve a one-step orthogonal deprotection/protection strategy of a thioacetal/aldehyde and the selective oxidative cleavage of a prenyl group in the presence of two other unsaturated moieties. The synthesis of both C4' diastereoisomers of integric acid delivered unambiguous evidence for (S)-stereochemistry at the C4' position.
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Waalboer et al. (2009) studied this question.
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