Selective synthesis of 2-substituted 4-carboxy oxazoles, thiazoles and thiazolidines from serine or cysteine amino acids
作者:Barbara Di Credico、Gianna Reginato、Luca Gonsalvi、Maurizio Peruzzini、Andrea Rossin
DOI:10.1016/j.tet.2010.09.104
日期:2011.1
The synthesis of new 4-carboxy oxazoles, thiazoles and thiazolidines by condensation of serine or cysteine with aldehydes or acids is described. Due to the optimization of a mild and selective procedure, which takes advantage of the positive effect of microwave irradiation on the MnO2 mediated oxidation step, the 2-substituted-4-carboxy derivatives can be obtained in multi-gram scale. Examples of coordination
Oxidation of 4-carboxylate thiazolines to 4-carboxylate thiazoles by molecular oxygen
作者:Yue Huang、Haifeng Gan、Shang Li、Jinyi Xu、Xiaoming Wu、Hequan Yao
DOI:10.1016/j.tetlet.2010.01.091
日期:2010.3
A facile and environment-benign oxidation by molecular oxygen was applied for the conversion of 4-carboxylate thiazolines to 4-carboxylate thiazoles. The substituent effect on thiazoline ring was investigated. it was found that electron-poor group on the thiazoline ring could facilitate the oxidation. (C) 2010 Elsevier Ltd. All rights reserved.