Synthetic applications of 2-(1,3-dithian-2-yl)indoles. IV. New synthesis of the tetracyclic ABED ring system of Strychnos alkaloids
作者:Anna Diez、Josep Castells、Pilar Forns、Mario Rubiralta、David S. Grierson、Henri-Philippe Husson、Xavier Solans、Mercè Font-Bardía
DOI:10.1016/s0040-4020(01)89689-7
日期:——
A new and versatile synthesis of tetracyclic compounds 10, 22 and 24 presenting the ABED ring system of Strychnos alkaloids is described by closure of the C1C11b bond in the key step. The intermediate tetrahydropyridinium salts 2 have been obtained from 2-(1,3-dithian-2-yl)indole (3) and either 2-cyano-3-ethyl-1-methyl-1,2,3,6-tetrahydropyridine (4a) or N-substituted Δ3-piperidein-2-ones (5).
四环化合物的一种新的和通用的合成10,22和24呈现的ABED环系统马钱子生物碱是由C的闭合描述1 C 11B键在关键步骤。中间体四氢吡啶鎓盐2是从2-(1,3-二硫-2-基)吲哚(3)和2-氰基-3-乙基-1-甲基-1,2,3,6-四氢吡啶(图4a)或ñ -取代的Δ 3 -piperidein -2-酮(5)。