Abstract
Naturally occurring L-783277 which belongs to 14-membered resorcylic acid lactones (RALs) turned out to be a potent kinase inhibitor against MEK (MAP kinase kinase). We successfully accomplished efficient and enantioselective total synthesis of L-783277 based on convergent assembly of one aromatic unit and two chiral building blocks with efficient orthogonal protection-deprotection strategy. Three key steps composed of olefin cross metathesis, addition of acetylene derivative to aldehyde, and Yamaguchi macrolactonization were subsequently employed to construct the framework of L-783277. The optical rotation value of L-783277 is for the first time presented in this Letter.
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