作者:Silvio J. Martinez、Lesley Dalton、John A. Joule
DOI:10.1016/0040-4020(84)85021-8
日期:1984.1
Indol-3-yl 1-methyl-1,2,5,6-tetrahydropyridin-4-yl ketone (1d) can be isomerised to indol-3-yl l-methyl-l,2,3,4-tetrahydropyridin-4-yl- ketone but the protonated form of this enamine could not be cyclised to the indole α-position. Both indol-2-yl l-methyl-l,2,5,6-tetrahydropyridin-4-yl ketone (1c) and its isomer (1d) were cyclised to 5-membered ketones by mineral acid catalysed Michael-type addition
吲哚-3-基1-甲基-1,2-,5,6-四氢吡啶-4-基酮(1d)可异构化为吲哚-3-基-1-甲基-1,2,3,4-四氢吡啶-4 -烯基酮,但该烯胺的质子化形式无法环化至吲哚α-位。吲哚-2-基-1-甲基-1,2,5,6-四氢吡啶-4-基酮(1c)及其异构体(1d)通过无机酸催化迈克尔型吲哚的加成反应环化为5元酮β和α位置分别位于不饱和酮体系上。将酮(1d)转化为1-乙酰基吲哚-3-基3-乙酰基-1,4,5,6-四氢吡啶-4乙酮经热乙酸酐加热。吲哚-3-基(1,2,5,6-四氢吡啶-4-基)甲烷的强碱处理导致双键异构化为与吲哚的共轭而不是环内烯胺的位置。