Nickel-Catalyzed Etherification of Phenols and Aryl Halides through Visible-Light-Induced Energy Transfer
作者:Da-Liang Zhu、Shan Jiang、Qi Wu、Hao Wang、Hai-Yan Li、Hong-Xi Li
DOI:10.1021/acs.orglett.1c03066
日期:2021.11.5
arylhalides, the ability of such a Ni-catalyzed transformation employing phenols to diaryl ethers is unsuccessful due to phenolates with much lower reduction potentials, which suppress the oxidation of nickel(II) intermediates into requisite Ni(III) species. We herein report visible-light-initiated, nickel-catalyzed O-arylation of phenols with arylhalides using t-BuNH(i-Pr) as the base and thioxanthen-9-one
尽管在链烷醇和芳基卤化物的镍催化醚化方面取得了一些进展,但由于苯酚盐的还原电位低得多,从而抑制了镍 (II) 中间体氧化成必需的化合物,因此这种使用苯酚的镍催化转化为二芳基醚的能力并不成功Ni(III) 物种。我们在此报告了在可见光下使用t- BuNH( i- Pr) 作为碱和thioxanthen -9-one 作为光敏剂的可见光引发的镍催化苯酚与芳基卤化物的O-芳基化。这种光电耦合表现出广泛的基板范围。
Toward a treatment of diabesity: In vitro and in vivo evaluation of uncharged bromophenol derivatives as a new series of PTP1B inhibitors
作者:Xiangqian Li、Qi Xu、Chao Li、Jiao Luo、Xiuxue Li、Lijun Wang、Bo Jiang、Dayong Shi
DOI:10.1016/j.ejmech.2019.01.057
日期:2019.3
Protein tyrosine phosphatase 1B (PTP1B) has been considered as a validated biological target for type 2 diabetes treatment, but past endeavors to develop inhibitors of PTP1B into drugs have been unsuccessful. Two challenging aspects are selective inhibition and cell permeability. A structure-based strategy was employed to develop uncharged bromophenols as a new series of PTP1B inhibitors. The most potent compound 22 (LXQ46) inhibited PTP1B with an IC50 value of 0.190 mu M, and showed remarkable selectivity over other protein tyrosine phosphatases (PTPs, 20-200 folds). In the SPR study, increasing concentrations of compound 22 led to concentration-dependent increases in binding responses, indicating that compound 22 could bind to the surface of PTP1B via noncovalent means. By treating insulin resistant C2C12 myotubes with compound 22, enhanced insulin and leptin signaling pathways were observed. Long-term oral administration of compound 22 reduced the blood glucose level of diabetic BKS db mice. The glucose tolerance tests (OGTT) and insulin tolerance tests (ITT) in BKS db mice showed that oral administration of compound 22 could increase insulin sensitivity. In addition, long-term oral administration of compound 22 could protect mice from obesity, which was not the result of toxicity. Our pharmacokinetics results from the rat-based assays showed that orally administered compound 22 was absorbed rapidly from the gastrointestinal tract, extensively distributed to the tissues, and rapidly eliminated from the body. All these results indicate that compound 22 could serve as a qualified agent to treat type II diabetes. (C) 2019 Elsevier Masson SAS. All rights reserved.