Total synthesis of (+)-scyphostatin featuring an enantioselective and highly efficient route to the side-chain via Zr-catalyzed asymmetric carboalumination of alkenes (ZACA)
作者:Emmanuel Pitsinos、Nikolaos Athinaios、Zhaoqing Xu、Guangwei Wang、Ei-ichi Negishi
DOI:10.1039/b920261g
日期:——
(+)-Scyphostatin (1) was synthesized via (i) construction of a side-chain 3b of > or = 98% purity in 19% yield in eleven steps featuring ZACA reaction, Negishi coupling, and HWE olefination, (ii) an asymmetric synthesis of a fully protected core 4 from 10a, and (iii) a three-step assembly of 1 in 42% yield.
(+)-Scyphostatin(1)通过(i)以ZACA反应,Negishi偶联和HWE烯化为特征的11个步骤构建纯度≥98%或纯度为98%,收率为19%的侧链3b,(ii)由10a不完全合成完全受保护的核4,以及(iii)以42%的收率得到1的三步组装。