Microwave-assisted synthesis of 3-substituted indoles via intramolecular arene–alkene coupling of o-iodoanilino enamines
摘要:
A generally applicable and high-yielding protocol for the synthesis of 3-substituted indole derivatives is described. Key features include microwave-assisted intramolecular arene alkene coupling of o-iodoanilino enamines, and expedient synthesis of o-iodoanilino enamine substrates employing N,O-acetal TMS ethers, which could be conveniently derived from the corresponding amides. Our unique procedure seems quite efficient and provides an easy access to a variety of 3-substituted indoles as privileged structure for a wide range of biological targets. (C) 2013 Elsevier Ltd. All rights reserved.
A novel method for indole skeleton synthesis under mild conditions mediated by samarium(ii) diiodide has been developed.
一种在温和条件下通过镨(II)二碘化物介导的吲哚骨架合成的新方法已经开发出来。
General Approach to the Total Synthesis of 9-Methoxy-Substituted Indole Alkaloids: Synthesis of Mitragynine, as well as 9-Methoxygeissoschizol and 9-Methoxy-<i>N</i><sub>b</sub>-methylgeissoschizol
作者:Jun Ma、Wenyuan Yin、Hao Zhou、Xuebin Liao、James M. Cook
DOI:10.1021/jo801839t
日期:2009.1.2
Herein, the full details of the synthesis of the 9-methoxy-substituted Corynanthe indole alkaloids mitragynine (1), 9-methoxygeissoschizol (3), and 9-methoxy-Nb-methylgeissoschizol (4) are described. Initially, an efficient synthetic route to the optically active 4-methoxytryptophan ethyl ester 20 on a multigram scale was developed via a Mori−Ban−Hegedus indolesynthesis. The ethyl ester of d-4-methoxytryptophan
A generally applicable and high-yielding protocol for the synthesis of 3-substituted indole derivatives is described. Key features include microwave-assisted intramolecular arene alkene coupling of o-iodoanilino enamines, and expedient synthesis of o-iodoanilino enamine substrates employing N,O-acetal TMS ethers, which could be conveniently derived from the corresponding amides. Our unique procedure seems quite efficient and provides an easy access to a variety of 3-substituted indoles as privileged structure for a wide range of biological targets. (C) 2013 Elsevier Ltd. All rights reserved.