3, 4, 5-Trichloropyridazine on treatment with 2-aminothiophenol gave 4-chloro-10H-benzo[b]pyridazino[3, 4-e][1, 4]thiazine (II) and 1-chloro-10H-benzo[b]pyridazino[4, 5-e][1, 4]-thiazine (III). II was converted into 10H-benzo[b]pyridazino[3, 4-e][1, 4]thiazine by catalytic dechlorination. Treatment of 4, 5-dichloro-3-(2H)-pyridazinone with 2-aminothiophenol afforded 5-(2-aminophenylthio)-4-chloro-3(2H)pyridazinone, which was cyclized on heating with potassium carbonate in dimethylformamide to yield 10H-benzo[b]pyridazino[4, 5-e][1, 4]thiazin-1(2H)-one. Chlorination of the latter with phosphoryl chloride and N, N-dimethylaniline afforded III. Several 2-substituted-10H-benzo[b]-pyridazino[4, 5-e][1, 4]thiazin-1(2H)-ones were synthesized.
3, 4, 5-三
氯哒嗪与2-
氨基
硫酚反应得到4-
氯-10H-苯并[b]
哒嗪并[3,4-e][1,4]
噻嗪(II)和1-
氯-10H-苯并[b]
哒嗪并[4,5-e][1,4]
噻嗪(III)。II通过催化脱
氯反应转化为10H-苯并[b]
哒嗪并[3,4-e][1,4]
噻嗪。4, 5-二
氯-3-(2H)-
哒嗪酮与2-
氨基
硫酚反应生成5-(2-
氨基苯
硫基)-4-
氯-3(2H)
哒嗪酮,该化合物在加热及
碳酸钾存在的条件下于二甲基甲酰胺中环化生成10H-苯并[b]
哒嗪并[4,5-e][1,4]
噻嗪-1(2H)酮。后者与
磷酰
氯和
N,N-二甲基苯胺反应得到III。合成了几种2-取代-10H-苯并[b]
哒嗪并[4,5-e][1,4]
噻嗪-1(2H)酮。