Chiral Calcium Phosphate-Catalyzed Enantioselective Amination of 3-Aryl-2-oxindoles with Dibenzyl Azodicarboxylate
作者:Zhenwei Wu、Suvratha Krishnamurthy、K. S. Satyanarayana Tummalapalli、Jon C. Antilla
DOI:10.1021/acs.joc.2c00432
日期:2022.6.17
A chiral calcium phosphate-catalyzed enantioselective amination of 2-oxindoles with dibenzyl azodicarboxylate has been developed, affording the products in consistently high yields and excellent enantioselectivity. This synthetic method features low catalyst loading and a high catalytic efficiency. Moreover, the practical value of this process is well demonstrated by a scale-up experiment and a trial
We report an FeCl2-catalyzed radical rearrangement of aryl peroxyoxindoles into 1,3-benzooxazin-2-ones to obtain a variety of aryl substituted 1,3-benzooxazin-4-ones in moderate to good yields. Mechanistically, this skeletal rearrangement of peroxyoxindoles proceeded via radical pathway and was well supported with a series of experimental findings and DFT studies.
Synthesis of ɑ‐Aryl‐oxindoles via Grignard Reaction with Isatin in the Presence of Diphenyl Phosphite
作者:Xinxin X. Zhang、Pengkai K. Wang、Songlin L. Zhang
DOI:10.1002/asia.202400297
日期:2024.7.2
A protocol has been developed for the synthesis of α-aryl-oxindoles from isatin and Grignard reagents in the presence of diphenyl phosphite for the first time. This reaction was conveniently carried out under mild conditions in a one-pot fashion with moderate to excellent yields.
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.
Palladium/Lewis Acid Co-catalyzed Cyclocarbonylation of (2-Aminoaryl)(aryl)methanols: An Access to 3-Aryl-indolin-2-ones