phenol as a directing group, high regioselectivity, good substrate scope, mild reaction conditions, and high efficiency. To the best of our knowledge, this is the first example of a regioselective C−H alkenylation of unprotected phenols utilizing phenolic hydroxyl group as a directing group. The alkenylation of unprotected tyrosine and intramolecular cyclization are also successfully carried out under
Visible-Light-Induced C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Coupling Reaction for the Regioselective Synthesis of 3-Functionalized Coumarins
作者:Ke Zhang、Li Qiao、Jianwei Xie、Zhenwei Lin、Hanjie Li、Ping Lu、Yanguang Wang
DOI:10.1021/acs.joc.1c00848
日期:2021.7.16
A photocatalysis strategy for the regioselective synthesis of 3-functionalized coumarins is reported. With visible light irradiation, a direct and regioselective C(sp2)–C(sp3) coupling reaction of 3-(2-hydroxyphenyl)acrylates with ethers or thioethers occurs by using Ru(bpy)3Cl2·6H2O as a photocatalyst and TBHP as an oxidant. The cascade process involves alkenylation of the C(sp3)–H bond of ethers
An efficient route from coumarins to highly functionalized N-phenyl-2-quinolinones via Buchwald–Hartwig amination
作者:Thomas Ullrich、Francis Giraud
DOI:10.1016/s0040-4039(03)00884-0
日期:2003.5
Multiple substituted N-phenyl-2-quinolinones were obtained in a convenient four-step route from a variety of commercially available coumarins, utilizing customised Buchwald-Hartwig amination protocols for the key reaction. Whereas simple aminolysis of coumarins is limited to non-electron-deficient, sterically unhindered derivatives of aniline under harsh conditions, the present method allows for conversions with multiple substituted aromatic amines, as demonstrated by the example of chlorinated aminosalicylates. (C) 2003 Elsevier Science Ltd. All rights reserved.
TETRAHYDROPYRANYLOXY-DIRECTED<i>ortho</i>LITHIATION OF AROMATIC SYSTEMS. SYNTHESIS OF<i>o</i>-HYDROXYCINNAMATE ESTERS FROM PHENOLS
作者:Richard A. Bunce、Joel D. Moore
DOI:10.1080/00304949709355199
日期:1997.6
Fries; Klostermann, Chemische Berichte, 1906, vol. 39, p. 874