Design, synthesis and biological evaluation of uncharged catechol derivatives as selective inhibitors of PTP1B
作者:Xiang-Qian Li、Qi Xu、Jiao Luo、Li-Jun Wang、Bo Jiang、Ren-Shuai Zhang、Da-Yong Shi
DOI:10.1016/j.ejmech.2017.05.007
日期:2017.8
obesity. However, the development of charged PTP1B inhibitors was restricted due to their low cell permeability and poor bioavailability. Based on active natural products, two series of uncharged catecholderivatives were identified as PTP1B inhibitors by targeting a secondary aryl phosphate-binding site as well as the catalytic site. The most potent inhibitor 22 showed an IC50 of 0.487 μM against PTP1B and
An Intramolecular Wittig Approach toward Heteroarenes: Synthesis of Pyrazoles, Isoxazoles, and Chromenone-oximes
作者:Pankaj V. Khairnar、Tsai-Hui Lung、Yi-Jung Lin、Chi-Yi Wu、Srinivasa Rao Koppolu、Athukuri Edukondalu、Praneeth Karanam、Wenwei Lin
DOI:10.1021/acs.orglett.9b01395
日期:2019.6.7
α-Halohydrazones/ketoximes are transformed into trisubstituted pyrazoles/disubstituted isoxazoles by treatment with phosphine, acyl chloride, and a base. Mechanistic investigations revealed the in situ formation of azo/nitroso olefin intermediates which underwent a tandem phospha-Michael/N- or O-acylation/intramolecular Wittig reaction to afford the heteroarenes in moderate to good yields. Further
One-pot synthesis of indolizine via 1,3-dipolar cycloaddition using a sub-equivalent amount of K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> as an efficient oxidant under base free conditions
作者:Chao Wang、Huayou Hu、Juanfang Xu、Weiqiu Kan
DOI:10.1039/c5ra06019b
日期:——
X = Cl or Br; EWG1, EWG2 = electron withdrow group, one-pot reaction, 29 examples, yields from moderate to high, gram scale-up potential confirmed.
X = 氯或溴;EWG1,EWG2 = 电子吸引基团,一锅法反应,29个例子,产率从中等到高,克级放大潜力得到确认。
Process for preparing phenyl esters of substituted acids
申请人:E. I. Du Pont de Nemours and Company
公开号:US05235077A1
公开(公告)日:1993-08-10
An improved process for preparing phenyl esters of alkanoyloxyacetic acids in which phenyl chloroacetate is reacted with the salt of a carboxylic acid.
一种改进的制备烷酰氧乙酸苯酯的方法,其中苯氯乙酸酯与羧酸盐发生反应。
Electron-Withdrawing Substituents Decrease the Electrophilicity of the Carbonyl Carbon. An Investigation with the Aid of <sup>13</sup>C NMR Chemical Shifts, ν(CO) Frequency Values, Charge Densities, and Isodesmic Reactions To Interprete Substituent Effects on Reactivity
electron-withdrawing substituents destabilize the carbonyl derivatives investigated. So, a significant ground-state destabilization of carboxylic acid esters, and carbonyl compounds in general, due to the decreased resonance stabilization, is proposed as a novel concept to explain both the increase in their reactivity and the changes in the chemical shifts and carbonyl frequencies induced by electron-withdrawing