Copper(II)-Mediated ortho-Selective C(sp2)–H Tandem Alkynylation/Annulation and ortho-Hydroxylation of Anilides with 2‑Aminophenyl‑1H‑pyrazole as a Directing Group
2-Aminophenyl-1H-pyrazole has been identified as a viable directing group to promote copper(II)-mediated ortho-selective sp2 C–H bond tandem alkynylation/annulation of anilides with terminal alkynes to offer arylmethylene isoindolinones. Meanwhile, copper(II)-mediated ortho-selective sp2 C–H hydro...
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Veröffentlicht in: | Journal of organic chemistry 2018-02, Vol.83 (4), p.2382-2388 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | 2-Aminophenyl-1H-pyrazole has been identified as a viable directing group to promote copper(II)-mediated ortho-selective sp2 C–H bond tandem alkynylation/annulation of anilides with terminal alkynes to offer arylmethylene isoindolinones. Meanwhile, copper(II)-mediated ortho-selective sp2 C–H hydroxylation of anilides has also been optimized as the major reaction pathway by using Cu(OAc)2 as the promoter and 1,1,3,3-tetramethylguanidine as an organic base. Recovery of the directing group was achieved by hydrazinolysis for arylmethylene isoindolinones and basic hydrolysis for the hydroxylation products. |
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ISSN: | 0022-3263 1520-6904 |
DOI: | 10.1021/acs.joc.7b02893 |