The Regioselective Synthesis of Tepoxalin, 3-[5-(4-Chlorophenyl)-1-(4-methoxyphenyl)-3-pyrazolyl]-<i>N</i>-hydroxy-<i>N</i>-methylpropanamide and Related 1,5-Diarylpyrazole Anti-inflammatory Agents
作者:William Murray、Michael Wachter、Donald Barton、Yolanda Forero-Kelly
DOI:10.1055/s-1991-26367
日期:——
Tepoxalin, a potent anti-inflammatory agent, and its analogs can be synthesized by condensing an appropriate arylhydrazine hydrochloride and a 6-aryl-4,6-dioxohexanoic acid in alcohol with a base catalyst. These diarylpyrazolylpropanoic acids can be converted to their N-methylhydroxamic acids by generating the requisite acid chloride, and allowing it to react with N-methylhydroxylamine.
Tepoxalin及其类似物(二芳基吡唑基丙酸)的合成方法:
1. 将芳基肼盐酸盐与6-芳基-4,6-二氧代己酸在醇溶剂中,在碱性催化剂作用下缩合。
2. 生成的二芳基吡唑基丙酸可以转化为其N-甲基羟胺酸:
- 首先生成相应的酰氯
- 然后与N-甲基羟胺反应