Design, Synthesis, and Biological Activity of New N-(Phenylmethyl)-benzoxazol-2-thiones as Macrophage Migration Inhibitory Factor (MIF) Antagonists: Efficacies in Experimental Pulmonary Hypertension
摘要:
Macrophage migration inhibitory factor (MIF) is a key pleiotropic mediator and a promising therapeutic target in cancer as well as in several inflammatory and cardiovascular diseases including pulmonary arterial hypertension (PAH). Here, a novel series of N-(phenylmethyl)-benzoxazol-2-thiones 5-32 designed to target the MIF tautomerase active site was synthesized and evaluated for its effects on cell survival. Investigation of structure-activity relationship (SAR) particularly at the 5-position of the benzoxazole core led to the identification of 31 that potently inhibits cell survival in DU-145 prostate cancer cells and pulmonary endothelial cells derived from patients with idiopathic PAH (iPAH-ECs), two cell lines for which survival is MIF-dependent. Molecular docking studies helped to interpret initial SAR related to MIF tautomerase inhibition and propose preferred binding mode for 31 within the MIF tautomerase active site. Interestingly, daily treatment with 31 started 2 weeks after a subcutaneous monocrotaline injection regressed established pulmonary hypertension in rats.
Reactions of α,<i>N</i>-Diarylnitrones with<i>O</i>-Methyl Diphenylphosphinothioate and Oxidations of<i>N</i>-Alkylidene-2-hydroxyanilines with Silver Oxide. Preparation of Benzoxazoles
作者:Masaaki Yoshifuji、Rihei Nagase、Naoki Inamoto
DOI:10.1246/bcsj.55.873
日期:1982.3
Reactions of α,N-diarylnitrones in the presence of O-methyl diphenylphosphinothioate at 150 °C gave 2-arylbenzoxazoles (3) in fairly good yields. Oxidation of N-alkylidene-2-hydroxyanilines with silver oxide afforded 2-alkenyl-, 2-alkyl-, or 2-arylbenzoxazoles (7 and 3) in good yields under mild reaction conditions (at room temperature). A plausible mechanism for formation of 3 and 7 has been discussed
Nano-tube TiO2 as a new catalyst for eco-friendly synthesis of imines in sunlight
作者:Mona Hosseini-Sarvari
DOI:10.1016/j.cclet.2010.11.017
日期:2011.5
Nanomaterials are considered as suitable heterogeneous catalysts for many organic reactions. Herein nano-tube TiO2 has been reported as a heterogeneous catalyst, for synthesis of imines in sunlight at room temperature under solvent-free conditions. The condensation of less electrophilic carbonyl compounds with poorly nucleophilic amines was afforded imines in excellent yields. (c) 2010 Mona Hosseini-Sarvari. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.