A new CAN-catalyzed domino process related to the Nenitzescu reaction: very concise access to fused ortho-indolequinones from simple precursors
摘要:
The CAN-catalyzed three-component reaction between primary amines, beta-ketoesters and naphthoquinone in ethanol at room temperature afforded as the main products the corresponding Michael adducts, oxidized to the quinone stage. When these compounds were refluxed in ethanol in the presence of CAN, they afforded tricyclic ortho-quinones derived from the benzo[g]indole-4,5-dione framework via a domino mechanism comprising a sequence of 5-exo-trig cyclization, elimination, Michael addition, oxo-enol tautomerism and hydroquinone oxidation individual steps. (C) 2013 Elsevier Ltd. All rights reserved.
Expedient, one-pot preparation of fused indoles via CAN-catalyzed three-component domino sequences and their transformation into polyheterocyclic compounds containing pyrrolo[1,2-a]azepine fragments
作者:Padmakar A. Suryavanshi、Vellaisamy Sridharan、J. Carlos Menéndez
DOI:10.1039/c004703a
日期:——
The CAN-catalyzed three-component between reaction between primary amines, β-dicarbonyl compounds and naphthoquinones or 2-bromonaphthoquinones afforded, respectively, 5-hydroxybenzo[g]indoles and benzo[f]indole-4,9-diones, the former of which were transformed into tetracyclic azepino[1,2-a]benzo[g]indole systems through a γ-alkylation/ring-closing metathesis sequence.
这 能够伯胺之间的反应之间催化的三组分, β-二羰基化合物和萘醌或2-溴萘醌分别提供了5-羟基苯并[ g ]吲哚和苯并[ f ]吲哚-4,9-二酮,它们的前者转化为四环氮杂[1,2- a ]苯并[ g ]吲哚 系统通过γ-烷基化/闭环复分解序列。