Heterocyclic compounds from urea derivatives. Part XXII. Thiobenzoylated carbonohydrazides and their cyclisation
作者:Roshan Esmail、Frederick Kurzer
DOI:10.1039/p19750001781
日期:——
des. 1-Phenyl- and 1-benzylidene-carbonohydrazide similarly yield 5-monothioaroyl compounds. All are readily cyclised by mineral acids to 2-aryl-5-hydroxy-1,3,4-thiadiazoles, with loss of hydrazine or its appropriate derivative, but are unaffected by alkali. The thioaroyl adducts and their stable S-alkyl derivatives undergo ring closure when treated with hydrazine to give 4-(substituted amino)-3-aryl-5-hydroxy-1
硫代芳酰基
硫代乙酸依次将碳酰
肼转化为1-
硫代芳酰基-和1,5-双(
硫代芳酰基)-碳酰
肼。1-苯基-和1-亚苄基-碳酰
肼类似地产生5-单
硫代芳酰基化合物。所有这些都容易被
无机酸环化成2-芳基-5-羟基-1,3,4-
噻二唑,而失去
肼或其合适的衍
生物,但不受碱的影响。当用
肼处理时,
硫代芳酰基加合物及其稳定的S-烷基衍
生物进行闭环反应,得到4-(取代的
氨基)-3-芳基-5-羟基-
1,2,4-三唑。