Discovery of (S)-4-isobutyloxazolidin-2-one as a novel leucyl-tRNA synthetase (LRS)-targeted mTORC1 inhibitor
摘要:
A series of leucinol analogs were investigated as leucyl-tRNA synthetase-targeted mTORC1 inhibitors. Among them, compound 5, (S)-4-isobutyloxazolidin-2-one, showed the most potent inhibition on the mTORC1 pathway in a concentration-dependent manner. Compound 5 inhibited downstream phosphorylation of mTORC1 by blocking leucine-sensing ability of LRS, without affecting the catalytic activity of LRS. In addition, compound 5 exhibited cytotoxicity against rapamycin-resistant colon cancer cells, suggesting that LRS has the potential to serve as a novel therapeutic target. (C) 2016 Elsevier Ltd. All rights reserved.
racemization. 5-Substituted 1H-tetrazoles were effectively synthesized from aldoximes and diphenyl phosphorazidate (DPPA) under reflux conditions in xylenes. Various aldoximes underwent the cycloaddition reaction to afford the corresponding 5-substituted 1H-tetrazoles in short reaction times and in good yields. Chiral aldoximes derived from amino acids also gave aminotetrazoles with almost no racemization.
Copper(0) Nanoparticles in Click Chemistry: Synthesis of 3,5-Disubstituted Isoxazoles
作者:T. M. Vishwanatha、Vommina V. Sureshbabu
DOI:10.1002/jhet.2065
日期:2015.11
An efficient procedure for the synthesis of 3,5‐disubstituted isoxazoles via [3 + 2] cycloaddition reaction of in situ generated nitrileoxides with acetylenes employing readily preparable copper(0) nanoparticles is described. A variety of in situ generated nitrileoxide and acetylenic substrates were engaged in the study and found to undergo cyclization in short duration affording respective isoxazoles