Transition-metal-free Chemoselective Oxidative C−C Coupling of the sp<sup>3</sup>C−H Bond of Oxindoles with Arenes and Addition to Alkene: Synthesis of 3-Aryl Oxindoles, and Benzofuro- and Indoloindoles
A transition‐metal (TM)‐free and halogen‐free NaOtBu‐mediated oxidative cross‐coupling between the sp3 C−H bond of oxindoles and sp2 C−H bond of nitroarenes has been developed to access 3‐aryl substituted and 3,3‐aryldisubstituted oxindoles in DMSO at room temperature in a short time. Interestingly, the sp3 C−H bond of oxindoles could also react with styrene under TM‐free conditions for the practical
Detrifluoroacetylative in Situ Generation of Free 3-Fluoroindolin-2-one-Derived Tertiary Enolates: Design, Synthesis, and Assessment of Reactivity toward Asymmetric Mannich Reactions
作者:Chen Xie、Lijun Zhang、Wanxing Sha、Vadim A. Soloshonok、Jianlin Han、Yi Pan
DOI:10.1021/acs.orglett.6b01516
日期:2016.7.1
situ generation of a new type of fluorinated amideenolates derived from 3-fluoroindolin-2-one and their asymmetric Mannich additions with sulfinylaldimines bearing fluoroalkyl groups is reported, which afforded α-fluoro-β-(fluoroalkyl)-β-aminoindolin-2-ones containing C–F quaternary stereogenic centers with excellent yields and high diastereoselectivities.
Palladium-Catalyzed Carbonylative α-Arylation of 2-Oxindoles with (Hetero)aryl Bromides: Efficient and Complementary Approach to 3-Acyl-2-oxindoles
作者:Zhong Lian、Stig D. Friis、Troels Skrydstrup
DOI:10.1002/anie.201404217
日期:2014.9.1
An efficient Pd‐catalyzed carbonylative α‐arylation of 2‐oxindoles with aryl and heteroaryl bromides for the one‐step synthesis of 3‐acyl‐2‐oxindoles has been developed. This reaction proceeds efficiently under mild conditions and is complementary to the more common oxindole forming reactions. The transformation only requires a mild base and provides good to excellent yields even with heteroaromatic
Asymmetric One-Pot Sequential Mannich/Hydroamination Reaction by Organo- and Gold Catalysts: Synthesis of Spiro[pyrrolidin-3,2′-oxindole] Derivatives
作者:Xianjie Chen、Hui Chen、Xun Ji、Hualiang Jiang、Zhu-Jun Yao、Hong Liu
DOI:10.1021/ol4004542
日期:2013.4.19
An asymmetric organo- and gold-catalyzed one-pot sequential Mannich/hydroamination reaction has been developed. Using this protocol, spiro[pyrrolidin-3,2'-oxindole] derivatives were synthesized in good yields (up to 91%) and excellent enantioselectivities (up to 97% ee).