Pyridazine Derivatives. X. 10H-Benzo[b]pyridazino[3, 4-e][1, 4]thiazine and 5H-Benao[b]pyridazino[4, 3-e][1, 4]thiazine
作者:Fumio Yoneda、Takayuki ohtaka、Yoshihiro Nitta
DOI:10.1248/cpb.14.698
日期:——
4-(2-Aminophenylthio)-3, 6-dichloropyridazine (I) on treating with dil. Hydrochloric acid or acetic acid gave 3-chloro-5H-benzo[b]pyridazino[4, 3-e][1, 4]thiazine (3, 4-diazapheno-thiazine type) through rearrangement and cyclization. 3-Chloro-10H-benzo[b]pyridazino-[3, 4-e][1, 4]thiazine (1, 2-diazaphenothiazine type) was obtained by either heating of I at 150°or treating of I with conc. hydrochloric acid through direct cyclization. The mechanism of the aforesaid reactions was discussed using a molecular orbital method. Several 1, 2-and 3, 4-diazaphenothiazine derivatives were synthesized.
4-(2-Aminophenylthio -3, 6-dichloropyridazine) (I)在稀盐酸或醋酸处理后,通过重排和环化反应得到 3-氯-5H-苯并[b]哒嗪并[4, 3-e][1, 4]噻嗪(3, 4-diazapheno-thiazine 型)。通过 150°加热 I 或用浓盐酸直接环化处理 I,可以得到 3-氯-10H-苯并[b]哒嗪并[3,4-e][1,4]噻嗪(1,2-噻吩并噻嗪型)。使用分子轨道法讨论了上述反应的机理。合成了几种 1、2 和 3、4-二氮杂吩噻嗪衍生物。