Chincona Alkaloid-Catalyzed Enantioselective Trifluoromethylthiolation of Oxindoles
作者:Tao Yang、Qilong Shen、Long Lu
DOI:10.1002/cjoc.201400392
日期:2014.8
An organocatalytic asymmetric trifluoromethylthiolation of 3‐aryl or 3‐alkyloxindoles employing a trifluoromethyl‐substituted thioperoxide as the electrophilic trifluoromethylthiolating reagent was described. Reactions occurred in good to excellent enantioselectivities to generate oxindoles with a SCF3‐substituted quaternary chiral center.
Chiral 1,2,3-Triazoliums as New Cationic Organic Catalysts with Anion-Recognition Ability: Application to Asymmetric Alkylation of Oxindoles
作者:Kohsuke Ohmatsu、Mari Kiyokawa、Takashi Ooi
DOI:10.1021/ja1102844
日期:2011.2.9
Chiral1,2,3-triazoliums have been designed, and the rational structural modification based on their unique anion-binding abilities has led to the establishment of the highly enantioselective alkylation of 3-substituted oxindoles.
Facile and Efficient Synthesis of 3-Pyrimidinyl Oxindoles by Phase-Transfer-Catalyzed Regioselective Nucleophilic Aromatic Substitution
作者:Fabian Brüning、Dmitry Katayev、Antonio Togni
DOI:10.1002/ejoc.201800587
日期:2018.8.23
Various 3‐(heteroaryl)oxindoles are obtained from the phase‐transfer‐catalyzed reaction of 3‐substituted oxindoles with chloro heteroarenes, in particular 2,4‐dichloropyrimidine.
A highlyenantioselective Michael addition of 2-oxindoles (1) to vinyl selenone (2) in RTILs catalyzed by a Cinchonaalkaloid-based thiourea has been developed in high yields (80-91%) with excellent enantioselectivities (up to 95% ee).
Asymmetric Substitution at the Tetrasubstituted Chiral Carbon: Catalytic Ring-Opening Alkylation of Racemic 2,2-Disubstituted Aziridines with 3-Substituted Oxindoles
作者:Kohsuke Ohmatsu、Yuichiro Ando、Takashi Ooi
DOI:10.1021/ja411647x
日期:2013.12.18
A highly diastereo- and enantioselective ring-opening alkylation of racemic 2,2-disubstituted aziridines with 3-substituted oxindoles is achieved under the catalysis of a chiral 1,2,3-triazolium salt. This reaction represents a hitherto unknown, catalytic stereoselective carbon carbon bond formation through direct substitution at the tetrasubstituted chiral carbon.