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.
Naphthalene oxidation by peracetic acid catalysed by Mn3+ porphinoid complexes
作者:Svetlana V. Barkanova、Oleg L. Kaliya、Eugene A. Luk’yanets