期刊
SCIENTIFIC REPORTS
卷 3, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep02987
关键词
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资金
- DST [SR/S1/OC-05/2012, SR/S4/GC-05/2012, SR/NM/NS-29/2010]
- CRNN, India
- CSIR, India
We discover an important property of a small molecule ArCH(OMe)(2) which transforms catalytically inactive (PtBr2)-Br-II procatalyst in situ to an powerful catalyst Pt-IV-species for diverse annulation reaction. The powerful catalytic system enables selective activation of C-2-H/N-H and C-2-H/C-4-H of acetoacetanilide and C = O/C C of substituted butyne-1,2-dione for C-C/C-N, C-C/C-C and C-O/C-O bond-forming inter- and intramolecular annulation towards direct syntheses of functionalised 2-pyridones, cyclohexenones and 3(2H)-furanones respectively. In contrast to the common ligand, herein highly labile C-OMe bond of ArCH(OMe)(2) is expected to react with PtBr2 towards generation of the high-valent active catalyst. Unlike catalyst promoter or initiator, the reaction does not occur with PtBr2 in the absence of ArCH(OMe)(2). In situ generation of Pt-IV-species and -OMe fragment of ArCH(OMe)(2) were confirmed from the UV-vis characteristic peaks about 260 nm and trapping of -OMe group respectively. These observations provide new prospects and perspectives in catalysis for innovative catalyst design.
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