The enantioselective formal synthesis of the polyketide marine natural product (-)-clavosolide A is presented. The construction of the beta-C-glycoside subunit is highlighted by a one-pot oxocarbenium cation formation/reduction sequence. Yamaguchi dimerization afforded the diolide aglycon in 18 steps (longest linear sequence).
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Carrick et al. (2009) studied this question.