作者:Rafael Shapiro、Robert DiCosimo、Susan M. Hennessey、Barry Stieglitz、Onorato Campopiano、George C. Chiang
DOI:10.1021/op9901994
日期:2001.11.1
commercial synthesis of the DuPont herbicide azafenidin is described. Discovery of a novel synthesis of the triazolinone ring system and a practical, environmentally benign process to 5-cyanovaleramide were critical breakthroughs in enabling azafenidin to be manufactured at an acceptable cost. The process began with the selective hydrolysis of DuPont's nylon intermediate, adiponitrile, to 5-cyanovaleramide
描述了杜邦除草剂阿扎非尼的商业合成。三唑啉酮环系统的新合成方法的发现和 5-氰基戊酰胺的实用、环保工艺的发现是使阿扎非尼丁以可接受的成本生产的关键突破。该过程从杜邦公司的尼龙中间体己二腈选择性水解为 5-氰基戊酰胺开始。这通过 Hofmann 重排和 Pinner 型环化转化,得到含有三唑啉酮环的两个碳原子的关键脒羧酸盐中间体。己二腈的所有六个碳原子的保留建立了与芳基肼的 2 + 3 环缩合反应,这取代了昂贵的酰胺腙与光气或原始路线中使用的光气替代物的 4 + 1 环缩合反应。