Synthesis in the phenothiazine series

1-Bromophenothiazine (I) and 1,3-dibromophenothiazine (II) have been synthesized by the intramolecular rearrangement of 2-acetylaminophenyl 2-bromo-6-nitrophenyl sulfide (III) and 2-acetylaminophenyl 2,4-dibromo-6-nitrophenyl sulfide (VIII) and the subsequent cyclization of resulting N-acetyl-2-bromo-2-mercapto-6-nitrodiphenylamine (IV) and N-acetyl-2,4-dibromo-2-mercapto-2-nitrodiphenylamine (IX), followed by saponification of the acetyl groups of the latter, respectively.For Communication XXIV see [6].Translated from Khimiya Geterotsiklicheskikh Soedinenii, Vol. 6, No. 8, pp. 1041–1044, August, 1970.