Pd/C and RuCl2(PPh3)3/DPEphos effectively catalyzed the alkylation of indole with alcohols to give 3‐substituted indoles selectively. Various types of substrates were examined and were found to give the corresponding 3‐substituted indoles in up to 99 % yield. Under different reaction conditions, RuCl2(PPh3)3/DPEphos catalyzed the selective formation of bis(3‐indolyl)phenylmethane derivatives.
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Direct C3 Alkylation of Indoles and Oxindoles
作者:Shyam Basak、Ana Alvarez-Montoya、Laura Winfrey、Rebecca L. Melen、Louis C. Morrill、Alexander P. Pulis
DOI:10.1021/acscatal.0c01141
日期:2020.4.17
The direct C3 alkylation of indoles and oxindoles is a challenging transformation, and only a few direct methods exist. Utilizing the underexplored ability of triaryl boranes to mediate the heterolytic cleavage of α-nitrogen C–H bonds in amines, we have developed a catalytic approach for the direct C3 alkylation of a wide range of indoles and oxindoles using amine-based alkylating agents. We also employed
One-pot, three-component Fischer indolisation–<i>N</i>-alkylation for rapid synthesis of 1,2,3-trisubstituted indoles
作者:Christopher A. Hughes-Whiffing、Alexis Perry
DOI:10.1039/d0ob02185g
日期:——
A one-pot, three-component protocol for the synthesis of 1,2,3-trisubstituted indoles has been developed, based upon a Fischer indolisation–indole N-alkylation sequence. This procedure is very rapid (total reaction time under 30 minutes), operationally straightforward, generally high yielding and draws upon readily available building blocks (aryl hydrazines, ketones, alkyl halides) to generate densely
Co(III)-catalyzed, internal and terminal alkyne-compatible indole synthesis protocol is reported herein. The N-amino (hydrazine) group imparts distinct, diverse reactivity patterns for directed C–H functionalization/cyclization reactions. Notable synthetic features include regioselectivity for a meta-substituted arylhydrazine, regioselectivity for a chain-branched terminalalkyne, formal incorporation of
Iodine-Catalyzed C–H Amidation and Imination at the 2α-Position of 2,3-Disubstituted Indoles with Chloramine Salts
作者:Xiaozu Liu、Yuxiang Zhou、Zhongqin Yang、Qin Li、Liang Zhao、Peijun Liu
DOI:10.1021/acs.joc.8b00286
日期:2018.4.20
A novel iodine-catalyzed amidation and imination at the 2α-position of 2,3-disubstituted indoles in the presence of chloramine salts with high regioselectivity has been achieved. The protocol is applicable to a wide range of substrates to deliver the corresponding 2α-nitrogen-containing indole derivatives. Furthermore, to demonstrate the synthetic value of this established transformation, a concise