Process for the direct and regioselective functionalization in position 2 of phenothiazine
申请人:ZAMBON GROUP S.p.A.
公开号:EP0451675B1
公开(公告)日:1995-11-02
US5089613A
申请人:——
公开号:US5089613A
公开(公告)日:1992-02-18
Process for the direct and regioselective functionalization in position
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.