Stereoselective synthesis of cis and trans-fused 3a-aryloctahydroindoles using cyclization of N-vinylic α-(methylthio)acetamides: synthesis of (−)-mesembrane
作者:Miho Saito、Jun-ichi Matsuo、Hiroyuki Ishibashi
DOI:10.1016/j.tet.2007.03.153
日期:2007.6
Treatment of N-(2-arylcyclohex-1-en-1-yl)-alpha-(methylthio)acetamides with N-chlorosuccinimide (NCS) gave 3a-aryl-2,3,3a,4, 5,6-hexahydro-3-(methylthio)indol-2-ones. Desulfurization of the cyclization products followed by a catalytic hydrogenation of the resulting hexahydroindol-2-ones gave predominantly or exclusively trans-fused octahydroindol-2-ones. On the other hand, reduction of the desulfurization products with Et3SiH in CF3CO2H exclusively provided cis-fused octahydroindol-2-ones. A chiral induction of N-[2-(3,4-dimethoxy)phenylcyclohex-1-en-1-yl]-alpha-(methylthio)acetamide having an (R)-1-(l-naphthyl)ethyl group on the nitrogen atom led to the synthesis of (-)-mesembrane and (-)-trans-mesembrane. (c) 2007 Elsevier Ltd. All rights reserved.