The key C13−C23 fragment toward the total synthesis of iriomoteolide-1a (1) has been constructed from an 1,2-acetonide containing aldehyde 5 via a Julia−Kocienski olefination with the C16−C23 segment 6. The key step involves stereoselective introduction of the C29 methyl group by a highly efficient CuI-Tol-BINAP-catalyzed asymmetric conjugate addition of methylmagnesium bromide to an α,β-unsaturated
朝着全合成iriomoteolide-1a(1)的关键C13-C23片段是由含有醛5的1,2-
丙酮化物通过Julia-Kocienski烯烃与C16-C23链段6构成的。关键步骤包括通过高效的CuI-Tol-BINAP催化的
甲基溴化镁向α,β-不饱和酯的不对称共轭加成反应,立体选择性地引入C29甲基。