第 48 卷第 2 期Vol. 48 No. 2
2018 年 4 月Apr 2018

所属栏目:农药及中间体

一锅法合成3-二氟甲基-1-甲基-1H-吡唑-4-羧酸
杜升华1,2,刘 源1,2,王艳丽1,2 (1. 湖南化工研究院 国家农药创制工程技术研究中心,湖南 长沙 410014;2. 农用化学品湖南省重点实验室,湖南 长沙 410014)
摘 要:以4,4-二氟乙酰乙酸乙酯、原甲酸三乙酯、甲基肼为原料,采用一锅法合成了重要农药中间体3-二氟甲基-1-甲基-1H-吡唑-4-羧酸。并对反应条件进行了优化,反应总收率大于74%,产品含量大于98%。该方法具有工艺条件温和、易操作、三废少等优点,且生产成本较低,产品品质好,含量高,适合大规模工业化清洁生产。
关键词:一锅法;农药中间体;工艺改进
中图分类号:S482.2  文献标识码:A  文章编号:1009-9212(2018)02-0027-03
An One-pot Process for the Synthesis of 3-(Difluoromethyl)-1-methyl-1H-pyrazole-4-carboxylic Acid
DU Shen-hua1,2, LIU Yuan1,2, WANG Yan-li1,2 (1. Hunan Research Institute of Chemical Industry Co., Ltd., National Engineering Research Centre for Agrochemicals, Changsha 410014, China; 2. Hunan Province Key Laboratory for Agrochemicals, Changsha 410014, China)
Abstract:An important pesticide intermediates 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-carboxylic acid was synthesized by an one-pot method using ethyl 4,4-difluoro-3-oxobutanoate, triethyl orthoformate and methylhydrazineas as the raw materials. Under optimal reaction conditions, a yield of over 74% and a purity of over 98% were obtained. The method was suitable for industrial production with many advantages including mild reaction conditions, simple operation, less waste, low production cost and high quality.
Key words:one-pot; pesticide intermediates; process improvement
作者简介:杜升华(1976-),男,湖南新化人,副研究员,硕士,研究方向:农药及精细化学品的合成与开发(E-mail:48407849@qq.com)。
收稿日期:2018-03-28