Ni-Catalyzed Reductive Cyanation of Aryl Halides and Phenol Derivatives via Transnitrilation
作者:L. Reginald Mills、Joshua M. Graham、Purvish Patel、Sophie A. L. Rousseaux
DOI:10.1021/jacs.9b11208
日期:2019.12.11
reductive coupling for the synthesis of benzonitriles from aryl (pseudo)halides and an electrophilic cyanating reagent, 2-methyl-2-phenyl malononitrile (MPMN). MPMN is a bench-stable, carbon-bound electrophilic CN reagent that does not release cyanide under the reaction conditions. A variety of medicinally relevant benzonitriles can be made in good yields. Addition of NaBr to the reaction mixture allows for
barrier and reaction free energy, were calculated using density functional theory (DFT), and influencing factors of the reaction were discussed. Theoretical computations showed that this nucleophilicsubstitution is favorable both kinetically and thermodynamically, while electron-withdrawing groups on phenols are harmful to such reactions. This study will provide new knowledge and insights on the chemical
Copper-Catalyzed Regioselective C-H Sulfonyloxylation of Electron-Rich Arenes with <i>p</i>-Toluenesulfonic Acid and Sulfonyloxylation of Aryl(mesityl)iodonium Sulfonates
Copper-catalyzed regioselective C-H sulfonyloxylation of electron-rich arenes with p-toluenesulfonic acid has been developed. Electron-rich benzene derivatives and heteroarenes can undergo this C-H sulfonyloxylation reaction to generate aryl tosylates. Furthermore, sulfonyloxylation of aryl(mesityl)iodonium sulfonates has also been investigated. Both aryl(mesityl)iodonium tosylates and triflates can
Estrone sulfonates as inhibitors of estrone sulfatase
作者:Nicola M. Howarth、Atul Purohit、Michael J. Reed、Barry V.L. Potter
DOI:10.1016/s0039-128x(96)00243-7
日期:1997.4
In our continuing quest to design efficient inhibitors of estrone sulfatase activity and to assess the recognition of estrone sulfate surrogates by estrone sulfatase, we synthesized and evaluated several sulfonate derivatives of 5,6,7,8-tetrahydronaphth-2-ol and estrone. 5,6,7, 8-Tetrahydronaphth-2-methanesulfonate (II), and 5,6,7, 8-tetra-hydronaphth-2-(p-toluene)sulfonate (12) were found not to inhibit estrone sulfatase activity; estrone-3-methane-sulfonate (5), estrone-3-ethanesulfonate (6), estrone-3-butanesulfonate (7), and estrone-3-[(+)10-camphor]sulfonate (8) all weakly inhibited estrone sulfatase, and the best inhibitor from this class of compounds, was estrone-3-(p-toluene)sulfonate (9). At 10 mu M, it inhibited estrone sulfatase activity by 91%. These results emphasize some of the requirements needed for high-affinity binding to the enzyme. (C) 1997 by Elsevier Science Inc.