The reactions of amidinothioureas, imidoylthioureas, thioacylamidines, O-methyl-1-aryl-2-thioisobiurets, and 1-aryl-isodithiobiurets with diethyl azodicarboxylate (DEAD, diethyl diazenedicarboxylate) gave the corresponding thiadiazoles by the oxidative cyclic S-N bond formation. Analogously, the oxidative cyclization of 2-phenyl-5-(1-methylthiosemicarbazido)-3(2H)-pyridazinones with DEAD provided 4-methyl-7-phenyl-4H-pyridazino[4,5-e] [1,3,4]-thiadiazin-8(7H)-ones.
氨基
硫脲、亚
氨基
硫脲、
硫酰胺、O-甲基-1-芳基-2-
硫异丁
脲和1-芳基-异双
硫脲与
二乙基二噻
吡啶二
羧酸酯(
DEAD,
二乙基二氮二
羧酸酯)的反应通过氧化环状S-N键形成生成了相应的
噻二唑。类似地,2-苯基-5-(1-甲基
硫半
肼基)-3(2H)-
吡啶嗪酮与
DEAD的氧化环化反应生成了4-甲基-7-苯基-4H-
吡啶嗪[4,5-e][1,3,4]-噻二嗪-8(7H)-酮。