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
作者:Dean P. Phillips、Andrew R. Hudson、Bao Nguyen、Thomas L. Lau、Matthew H. McNeill、Jackline E. Dalgard、Jyun-Hung Chen、Richard J. Penuliar、Todd A. Miller、Lin Zhi
DOI:10.1016/j.tetlet.2006.08.004
日期:2006.10
The coupling of aryl bromides or iodides with oxindoles using a copper iodide-N,N'-dimethylethylene diamine system is presented. The reaction proceeds efficiently and tolerates a variety of substitution patterns. (c) 2006 Elsevier Ltd. All rights reserved.
Orthogonal Pd- and Cu-Based Catalyst Systems for C- and N-Arylation of Oxindoles
作者:Ryan A. Altman、Alan M. Hyde、Xiaohua Huang、Stephen L. Buchwald
DOI:10.1021/ja803179s
日期:2008.7.1
In the cross-coupling reactions of unprotected oxindoles with aryl halides, Pd- and Cu-based catalyst systems displayed orthogonal chemoselectivity. A Pd-dialkylbiarylphosphine-based catalyst system chemoselectively arylated oxindole at the 3 position, while arylation occurred exclusively at the nitrogen using a Cu-diamine-based catalyst system. Computational examination of the relevant L1Pd(Ar)(oxindolate) and diamine-Cu(oxindolate) species was performed to gain mechanistic insight into the controlling features of the observed chemoselectivity.