申请人:Hoechst Aktiengesellschaft
公开号:US04429134A1
公开(公告)日:1984-01-31
A process for the manufacture of a 2(3H)-benzothiazolone compound substituted in 3-position, or of a 2(3H)-naphthothiazolone compound substituted in 3-position which comprises treating a 2(3H)-iminobenzothiazoline compound substituted in 3-position or a 2(3H)-naphthothazoline compound substituted in 3-position with an alkali metal hydroxide or alkaline earth metal hydroxide in a solvent or diluent stable to alkalis, in the absence of water or with substantial exclusion of water, and cyclizing the alkali metal or alkaline earth metal salt of the ortho-mercapto-N-phenyl- or -naphthyl-urea compound substituted at the nitrogen atom so formed, optionally without intermediate isolation, by treatment with an acid to give the 2(3H)-benzothiazolone compound substituted in 3-position or the 2(3H)-naphthothiazolone compound substituted in 3-position. The process furnishes the final products with high yield and purity; waste water problems are excluded by this process.
一种制备3-位置取代的2(3H)-苯并噻唑酮化合物或3-位置取代的2(3H)-萘噻唑酮化合物的方法,包括将3-位置取代的2(3H)-亚苯基噻唑啉化合物或3-位置取代的2(3H)-萘噻唑啉化合物与碱金属氢氧化物或碱土金属氢氧化物在对碱稳定的溶剂或稀释剂中处理,无水或基本排除水,然后通过环化处理所形成的那些在氮原子上取代了邻位巯基-N-苯基或-萘基脲化合物的碱金属或碱土金属盐,选择性地不需中间分离,通过酸处理来得到3-位置取代的2(3H)-苯并噻唑酮化合物或3-位置取代的2(3H)-萘噻唑酮化合物。该方法提供了高收率和高纯度的最终产品,通过该方法排除了废水问题。