Solid Phase Behavior, Polymorphism, and Crystal Structure Features of Chiral Drug Metaxalone
作者:Alexander A. Bredikhin、Dmitry V. Zakharychev、Aidar T. Gubaidullin、Zemfira A. Bredikhina
DOI:10.1021/acs.cgd.8b00874
日期:2018.11.7
In addition to the previously known A-rac and B-rac polymorphs of the chiral drug metaxalone 1, an enantiopure A-(S)-form was obtained and studied. According to X-ray analysis, the crystalline organization of this form is close to the A-rac-1 polymorph. Crystallization of metaxalone melts is accompanied by the formation of a previously unknown metastable C-phase, which in the case of both racemic and
Syntheses of Phosphonium Salts from Phosphines and Carbenium: Efficient CO<sub>2</sub>
Fixation and Phase-Transfer Catalysts
作者:Aslam C. Shaikh、José M. Veleta、Jan Bloch、Hannah J. Goodman、Thomas L. Gianetti
DOI:10.1002/ejoc.202000221
日期:2020.5.10
A new library of phosphoniumsalts has been synthesized from the reaction of tris‐(2,6‐dimethoxyphenyl)carbenium with different phosphines. All these phosphoninum salts were efficient phase‐transfer catalysts for alkylation of 1,3 dicarbonyl compounds. One compound, a bifunctional phosphonium salt, prepared from tris‐(2,6‐dimethoxyphenyl)carbenium and an aminophosphine, was found to be an efficient
PhI(OAc)2-mediated oxidative trifluoromethylation of arenes with CF3SiMe3 under metal-free conditions
作者:Xinyue Wu、Lingling Chu、Feng-Ling Qing
DOI:10.1016/j.tetlet.2012.11.011
日期:2013.1
A PhI(OAc)2-mediated oxidative trifluoromethylation of arenes with CF3SiMe3 under metal-free conditions has been described. This protocol precludes the need of substrate pre-functionalization and metal catalysts, enabling a direct access to a series of trifluoromethylated arenes and heterocycles containing common functional groups in moderate and good yields.