An improved method for the synthesis of 7-chloro-5-(2-chlorophenyl)-2-(2-dimethylaminoethylthio)-3H-1, 4-benzodiazepine (IIa) and related compounds is described. IIa was obtained in 75.1% yield by the reaction of the 1, 4-benzodiazepin-2-one (Ia) with 2-dimethylaminoethanethiol in the presence of titanium tetracbloride ; a small amount of 7-chloro-5-(2-chlorophenyl)-2-dimethylamino-3H-1, 4-benzodiazepine (III) was obtained as a byproduct. A mechanistic interpretation of the formation of III is presented.
本文描述了一种合成 7-
氯-5-(2-
氯苯基)-2-(2-
二甲氨基乙
硫基)-3H-1, 4-
苯并二氮杂卓(IIa)及相关化合物的改进方法。在
四氯化钛存在下,1, 4-
苯并二氮杂卓-2-
酮(Ia)与 2-
二甲氨基乙硫醇反
应得到 IIa,收率为 75.1%;副产物为少量 7-
氯-5-(2-
氯苯基)-2-
二甲氨基-3H-1, 4-
苯并二氮杂卓(III)。文中对 III 的形成进行了机理解释。