Efficient and Selective Syntheses of (all-<i>E</i>)- and (6<i>E</i>,10<i>Z</i>)-2′-<i>O</i>-Methylmyxalamides D via Pd-Catalyzed Alkenylation−Carbonyl Olefination Synergy
作者:Guangwei Wang、Zhihong Huang、Ei-ichi Negishi
DOI:10.1021/ol801115s
日期:2008.8.7
Highly efficient and selective syntheses of both (all- E) and (6 E,10 Z)-isomers of 2'- O-methylmyxalamide D ( 2 and 3), in which the crucial conjugated pentaene moieties were assembled in > or =98% stereoselectivity through the use of two Pd-catalyzed alkenylation reactions, the Horner-Wadsworth-Emmons (HWE) olefination, and either the Corey-Schlessinger-Mills modified (CSM-modified) Peterson olefination
高效且选择性地合成 2'-O-甲基粘酰胺 D(2 和 3)的 (all-E) 和 (6 E,10 Z)-异构体,其中关键的共轭戊烯部分组装在 > 或 = 98通过使用两个 Pd 催化的烯基化反应、Horner-Wadsworth-Emmons (HWE) 烯化和 Corey-Schlessinger-Mills 改性(CSM 改性)Peterson 烯化 2 或 Still-Gennari 烯化 3 来提高立体选择性,被举报。2 或 3 以 16% 的收率由炔丙醇分 7 个步骤制备。