CuI/Cu(OTf)2/DMSO system-catalyzed intramolecular oxidative cyclization of (o-alkynyl)arylketones: Efficient synthesis of 1,4-naphthoquinones
摘要:
A concise and efficient method for the synthesis of 1,4-naphthoquinones has been successfully developed involving a CuI/Cu(OTf)(2)/DMSO system-catalyzed intramolecular oxidative cyclization of (o-alkynyl) arylketones. The present protocol provided a novel approach to access functionalized 1,4-naphthoquinones from non-naphthoquinone precursors with good selectivity and functional group tolerance. (C) 2019 Published by Elsevier Ltd.
Tandem oxidation–oxidative C–H/C–H cross-coupling: synthesis of arylquinones from hydroquinones
作者:Shuai Zhang、Feijie Song、Dongbing Zhao、Jingsong You
DOI:10.1039/c3cc41067f
日期:——
A concise and efficient approach to arylquinones from widely available hydroquinones has been developed through a tandem reaction involving the oxidation of hydroquinones and subsequent oxidative CâH/CâH cross-coupling of the resulting quinones with arenes.
Metal-Free Direct Amidation of Naphthoquinones Using Hydroxamic Acids as an Amide Source: Application in the Synthesis of an HDAC6 Inhibitor
作者:Cheng Zhang、C. James Chou
DOI:10.1021/acs.orglett.6b02740
日期:2016.11.4
A novel synthetic approach to amidoquinones by the reaction of naphthoquinones with hydroxamicacids under basic conditions was developed. The reaction is mild and operationally simple, and it affords high yields of amidoquinones. With this new method, a novel, very strong HDAC6 inhibitor, which showed high toxicity to AML cells, was successfully synthesized.
Silver-Catalyzed Direct Thiolation of Quinones by Activation of Aryl Disulfides to Synthesize Quinonyl Aryl Thioethers
作者:Cheng Zhang、Jesse McClure、C. James Chou
DOI:10.1021/acs.joc.5b00247
日期:2015.5.15
A silver-catalyzed coupling reaction of quinones with aryl disulfides for the synthesis of quinonyl aryl thio ethers is described. In the presence of AgOAc (0.2 equiv)/dppp (0.24 equiv) as the catalyst, (NH4)(2)S2O8 (3.0 equiv) as the oxidant, and Bu4NBF4 (1.0 equiv) as the additive, the reaction is simple, provides high yield (up to 88% yield), and possesses a broad substrate scope. The reaction is believed to proceed via direct activation of disulfides evidenced by observation of a metathesis reaction between two different disulfides placed together under the reaction conditions and C-13 NMR spectroscopy analysis.