Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 131, Issue 33, Pages 11678-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja9056163
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The first total synthesis of the potent RNA-polymerase inhibitor etnangien is described, which establishes unequivocally the relative and absolute configuration of this sensitive macrolide antibiotic. Key features of the expedient and modular synthesis include stereoselective substrate-controlled boron- and tin-mediated aldol couplings to set the characteristic sequences of methyl and hydroxyl bearing stereogenic centers with high degrees of stereoselectivity and yield, an efficient Heck macrocyclization of a conformationally restricted substrate, and a late-stage introduction of the labile side chain. The convergent approach should be amenable to designed analogues.
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