Unprecedented Vilsmeier Formylation: Expedient Syntheses of the Cruciferous Phytoalexins Sinalexin and Brassilexin and Discovery of a New Heteroaromatic Ring System
摘要:
A very concise first synthesis of sinalexin was achieved by regioselective formylation of 1-methoxyindoline-2 thione under Vilsmeier conditions followed by unprecedented ammonia workup, Similar formylation of indoline-2-thione yielded brassilexin and a novel pentacyclic heteroaromatic compound resulting from condensation of the Vilsmeier adduct of indoline-2-thione. Both sinalexin and brassilexin displayed strong antifungal activity against several pathogens of crucifers.
A new route to the versatile synthesis of thiopyrano[2,3-b:6,5-b′]diindoles via 2-(alkylthio)-indole-3-carbaldehydes
作者:Mukund Jha、Michael Edmunds、Kate-lyn Lund、Ashley Ryan
DOI:10.1016/j.tetlet.2014.08.100
日期:2014.10
versatile synthesis of symmetrically and unsymmetricallysubstituted thiopyrano[2,3-b:6,5-b′]diindoles has been developed by the condensation of 2-(alkylthio)-indole-3-carbaldehydes with indoline-2-thiones in the presence of catalytic amount of ethylenediamine diacetate (EDDA). The EDDA mediated condensation leads to a spontaneous cyclization followed by aromatization to form thiopyrano[2,3-b:6,5-b′]diindoles
通过2-(烷硫基)-吲哚-3-甲醛与二氢吲哚-2-硫酮的缩合反应,已开发出一种通用的对称和不对称取代的噻喃并[2,3- b:6,5- b ']二吲哚化合物。存在催化量的乙二胺二乙酸酯(EDDA)。EDDA介导的缩合导致自发环化,然后进行芳构化,以定量收率形成噻喃并[2,3- b:6,5- b ']二吲哚。
Synthesis and biological evaluation of fused thio- and selenopyrans as new indolocarbazole analogues with aryl hydrocarbon receptor affinity
A series of thio- and selenopyrans having two fused indole units, structurally related to indolocarbazoles, have been prepared and evaluated for aryl hydrocarbon receptor (AhR) affinity, leading to the identification of several new significant AhR ligands. In particular, the parent thiopyrano[2,3-b: 6,5-b'] diindole and its derivative having a methyl group in the central ring, as well as the two corresponding selenopyrans, displayed the highest potencies of the compounds tested. (C) 2009 Elsevier Ltd. All rights reserved.