Synthesis of 5-isoxazol-3-yl-pyrimidine nucleosides as potential antileishmanial agents
摘要:
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.
Tandem Reactions Leading to Bicyclic Pyrimidine Nucleosides and Benzopyran-4-ones
作者:Xuesen Fan、Yangyang Wang,、Yingying Qu、Haiyun Xu、Yan He、Xinying Zhang、Jianji Wang
DOI:10.1021/jo102131y
日期:2011.2.4
and efficient synthesis of bicyclic pyrimidine nucleosides and benzopyran-4-ones through oxidation of homopropargyl alcohols and subsequent isomerization, intramolecular addition of enol to allenic ketone has been developed. This methodology provides an efficient and promising approach to the structurally and pharmaceutically interesting pyrano[2,3-d]pyrimidine-2,5-dione nucleoside and benzopyran-4-one
已经开发了通过高炔丙醇的氧化和随后的异构化,将烯醇分子内加成到烯丙基酮中的新颖,快速,有效的双环嘧啶核苷和苯并吡喃-4-酮的合成方法。这种方法为结构和药学上有趣的吡喃并[2,3 - d ]嘧啶-2,5-二酮核苷和苯并吡喃-4-酮衍生物提供了有效而有前途的方法。