Chin Yen-Jin, Wang Shun-Yi, Loh Teck-Peng
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.
Org Lett. 2009 Aug 20;11(16):3674-6. doi: 10.1021/ol901480s.
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 alpha,beta-unsaturated ester.
用于全合成西表山岛内酯-1a(1)的关键C13-C23片段已由含醛基的1,2-缩丙酮5通过与C16-C23片段6进行Julia-Kocienski烯烃化反应构建而成。关键步骤包括通过高效的CuI-Tol-BINAP催化溴化甲基镁对α,β-不饱和酯进行不对称共轭加成,立体选择性地引入C29甲基。