期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 12, 期 7, 页码 734-743出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201601647
关键词
carbanion; cross-coupling; nitrobenzene; oxindoles; styrene; transition-metal-free
资金
- IISER Bhopal
- DST-SERB New Delhi [EMR/2015/000061]
- CSIR
- CSIR-UGC New Delhi
A transition-metal (TM)-free and halogen-free NaOtBu-mediated oxidative cross-coupling between the sp(3) C-H bond of oxindoles and sp(2) 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 sp(3) C-H bond of oxindoles could also react with styrene under TM-free conditions for the practical synthesis of quaternary 3,3-disubstituted oxindoles. The synthesized 3-oxindoles have also been further transformed into advanced heterocycles, that is, benzofuroindoles, indoloindoles, and substituted indoles. Mechanistic experiments of the reaction suggests the formation of an anion intermediate from the sp(3) C-H bond of oxindonle by tert-butoxide base in DMSO. The addition of nitrobenzene to the in-situ generated carbanion leads to the 3-(nitrophenyl)oxindolyl carbanion in DMSO which is subsequently oxidized to 3-(nitro-aryl) oxindole by DMSO.
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