Facile Synthesis of 2-Substituted Indoles and Indolo[3,2-b]carbazoles from 2-(Benzotriazol-1-ylmethyl)indole
摘要:
Replacement of the benzotriazole moiety of N-alkyl-2-(1-benzotriazol-1-ylalkyl)indo 6 and 9, prepared from 1-propargylbenzotriazole and o-iodoaniline followed by alkylation, with Grignard reagents gave the corresponding 2-substituted indoles 10 in good yield. Treatment of compounds 6 or 9 with zinc chloride afforded 6,12-disubstituted-6,12-dihydroindolo[3,2-b]carbazoles 11 in moderate to good yields. 6,12-Disubstituted-5,11-dihydroindolo[3,2-b]carbazoles 13 were prepared readily and in good yield from 2-(benzotriazol-1-ylalkyl)indoles 8 via dimerization in the presence of zinc chloride followed by dehydrogenation on exposure to air.
Syntheses of 6,12-disubstituted 5,11-dihydroindolo[3,2-b]carbazoles, including 5,11-dihydroindolo[3,2-b]carbazole-6,12-dicarbaldehyde, an extremely efficient ligand for the TCDD (Ah) receptor
作者:Joakim Tholander、Jan Bergman
DOI:10.1016/s0040-4020(99)00733-4
日期:1999.10
6,12-disubstituted 5,11-dihydroindolo[3,2-b]carbazoles have been synthesized via a range of methods: a) double Fischer indolization of the bis-phenylhydrazone of 2,5-dimethyl-1,4-cyclohexanedione, b) condensation of indole with aliphatic aldehydes, and c) Pd-mediated cyclization of a diphenyl phenylenediamine derivative. Most notably, 5,11-dihydroindolo[3,2-b]carbazole-6,12-dicarbaldehyde has been
通过一系列方法合成了对称和不对称的6,12-二取代的5,11-二氢吲哚并[3,2- b ]咔唑:a)2,5-二甲基-1,4的双-苯基hydr的双费歇尔吲哚化-环己二酮,b)吲哚与脂族醛的缩合,和c)Pd介导的二苯基苯二胺衍生物的环化。最显着地,已经合成了5,11-二氢吲哚并[3,2- b ]咔唑-6,12-二甲醛,由此证实了先前指定的结构。该化合物是TCDD(Ah)受体的极其有效的配体。