An Efficient Synthesis of 2-Substituted Benzoxazoles via RuCl3·3H2O Catalyzed Tandem Reactions in Ionic Liquid
作者:Xuesen Fan、Yan He、Yangyang Wang、Xinying Zhang、Jianji Wang
DOI:10.1002/cjoc.201190156
日期:2011.4
An efficientsynthesis of 2‐substituted benzoxazoles through RuCl3·3H2Ocatalyzed, air oxidized tandemreactions of 2‐aminophenols and aldehydes in [bmim]BF4 was developed. This synthetic strategy has such advantages as mild reaction conditions, cost‐free oxidant, readily available starting materials, and recyclable catalyst and solvent. As an application, it was successfully used in the synthesis of
Synthesis of 5-isoxazol-3-yl-pyrimidine nucleosides as potential antileishmanial agents
作者:Shenghai Guo、Jiliang Wang、Xinying Zhang、Sandrine Cojean、Philippe M. Loiseau、Xuesen Fan
DOI:10.1016/j.bmcl.2015.04.097
日期:2015.7
A simple and practical procedure for the preparation of C5-(isoxazol-3-yl)-pyrimidine nucleosides through 1,3-dipolar cycloaddition of the in situ formed C5-nitrile oxide substituted pyrimidine nucleosides with various terminal alkynes is presented. Compared with literature procedures, this new method has advantageous features such as readily available and inexpensive starting materials, simple procedure without using expensive transition metal catalyst, and broad scope of substrates. By employing this method, 30 nucleoside analogues were prepared in moderate yields. Biological studies on these C5-(isoxazol-3-yl)-pyrimidine nucleosides showed that most of them exhibited significant in vitro antileishmanial activity. (C) 2015 Elsevier Ltd. All rights reserved.