申请人:Zambon Group S.p.A.
公开号:US05089613A1
公开(公告)日:1992-02-18
Preparation of 2-alkylthio-phenothiazines by direct functionalization of phenothiazine by reaction of the phenothiazine, N-protected by an acryl group, with a sulfonating agent such as sulfuric acid, sulfuric anhydride, chlorosulfonic acid, or oleum, in order to obtain, after work-up of the reaction mixture, phenothiazine-2-sulfonic acid, followed by the reduction of this or, optionally, of its acyl chloride derivative, to obtain 2-mercapto-phenothiazine which subsequently is subjected to S-alkylation to thereby obtain the desired target compound.
通过对苯并噻嗪进行直接官能化反应,使用硫酸、硫酸酐、氯磺酸或油酸等磺化试剂对含有丙烯酰基保护基的苯并噻嗪进行反应,得到苯并噻嗪-2-磺酸盐。在反应混合物处理后,还原该化合物或其酰氯衍生物,得到2-硫代苯并噻嗪。随后对其进行S-烷基化反应,以得到所需的目标化合物2-烷基硫代苯并噻嗪。