Regioselective synthesis of 3,3-bis(indolyl)propanoic acid derivatives by iron(III)-catalyzed hydroarylation of propynoic acid derivatives with indoles
摘要:
Intermolecular hydroarylation of propynoic acid and its esters with indoles proceeded efficiently in acetic acid under a catalytic system of FeCl3/3AgOTf and afforded the corresponding 3,3-bis(indol-3yl) propanoic acids and their esters in high yields. In the case of 2-methylindole, 3-indolylacrylic acid and its ethyl ester were obtained in high yields. This iron-catalyzed hydroarylation showed a high regioselectivity at the 3-position of indoles and a high utility for the synthesis of bis(indol-3-yl) compounds, which are important for biological and pharmaceutical fields. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of indol-3-yl-benzofurans and carbazoles via Cu(OTf)2-catalyzed [3 + 2] and [4 + 2] cycloaddition
作者:Amar Nath Singh Chauhan、Vikrant Vini、Akhilesh Kumar、Rohan D. Erande
DOI:10.1039/d4ob00861h
日期:——
An efficient Cu(OTf)2-catalyzed [3 + 2] cycloaddition of indole-3-acrylate with p-benzoquinone has been developed to construct two distinct indole-tethered benzofuran scaffolds, offering the first-ever selective access to these scaffolds. Moreover, the [4 + 2] cycloaddition reaction of indole-3-acrylate with vinyl ketone derivatives was used to synthesize carbazoles in a one-pot manner. The disclosed
Aerobic C–H Olefination of Indoles via a Cross-Dehydrogenative Coupling in Continuous Flow
作者:Hannes P. L. Gemoets、Volker Hessel、Timothy Noël
DOI:10.1021/ol502910e
日期:2014.11.7
Herein, we report the first site-selective, Pd(II)-catalyzed, cross-dehydrogenative Heck reaction of indoles in micro flow. By use of a capillary microreactor, we were able to boost the intrinsic kinetics to accelerate former hour-scale reaction conditions in batch to the minute range in flow. The synergistic use of microreactor technology and oxygen, as both terminal oxidant and mixing motif, highlights the sustainable aspect of this process.