N-Heterocyclic Carbene-Palladium(II)-1-Methylimidazole Complex Catalyzed α-Arylation of Oxindoles with Aryl Chlorides and Aerobic Oxidation of the Products in a One-Pot Procedure
摘要:
NHC-Pd(II)-Im complex 1 was found to be an effective catalyst for the alpha-arylation of unprotected oxindoles with aryl chlorides to give products 4 in 44-98% yields under a N-2 atmosphere. Furthermore, if the reactions were first performed under conditions identical to those for the alpha-arylation reaction for 12 hand then exposed to air for another 3 h, 3-aryl-3-hydroxy-2-oxindoles 5 can be obtained in 49-84% yields In a one-pot procedure.
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
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.