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Synthesis 2019; 51(24): 4625-4634
DOI: 10.1055/s-0039-1690681
DOI: 10.1055/s-0039-1690681
paper
Transition-Metal-Promoted Oxidative Cyclization To Give 1,2,4-Trisubstituted Carbazole Scaffolds
Weitere Informationen
Publikationsverlauf
Received: 01. Juli 2019
Accepted after revision: 26. August 2019
Publikationsdatum:
13. September 2019 (online)
Abstract
Herein, we describe the synthesis of a 1,2,4-trisubstituted carbazole core from 5-(1H-indol-3-yl)-3-oxopentanoic acid esters or amides. For oxidative cyclization, we tested two different approaches. First, we used manganese triacetate as a conventional moderate oxidizer to ensure the radical course of the reaction. Second, we examined the use of a more complex oxidizing agent I2/Me(OTf)3. In both cases, formation of a fused-ring carbazole system with a 2-hydroxyl and 1-carboxylic substituent were observed. In connection with the formation of an unexpected reaction intermediate, mechanistic aspects of the process were discussed.
Supporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0039-1690681.
- Supporting Information
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