Reactions of phenothiazine thiocyanate derivatives with dialkyldithiophosphoric acids
作者:R. M. Kamalov、G. M. Makarov、O. N. Kataeva、R. Z. Musin、I. A. Litvinov、Kh. Al'-Akra、M. A. Pudovik
DOI:10.1007/bf00965438
日期:1991.2
The addition products of dialkyldithiophosphoric acids to the C = N bond in 3-thiocyanatophenothiazine rearrange to give relatively more stable S-(3-phenothiazinyl)-N-dialkoxythiophosphoryldithiocarbamates. An analogous derivative, formed in the reaction of diethyldithiophosphoric acid with 3-thiocyanato-10-ethylphenothiazine, is unstable and decomposes to give 3-mercapto-10-ethylphenothiazine and diethylisothiocyanatothiophosphate. The main pathway in the reaction of dialkyldithiophosphoric acids with 10-(thiocyanatoacetyl)phenothiazine appears to be acid-catalyzed cyclization of the latter to give 4-(10-phenothiazinyl)-3-thiazolin-2-one. However, the formation of 3-dialkoxythiophosphoryl-4-thiazolidinone-2-thiones is also observed in these reactions; these products result from rearrangement of the addition products of dithio acids to C = N bonds, followed by subsequent heterocyclization via elimination of phenothiazine. The molecular structure of 3-diisopropoxythiophosphoryl-4-thiazolidinone-2-thione was investigated by x-ray structural analysis; the heterocyclic fragment in this molecule exists in an envelope conformation with the nitrogen atom deviating from the plane of the other four atoms.