Ring Transformation of 2-Phenacylideneimidazolidines into 5-(2-Amino-ethyl)aminoisoxazoles The reaction of lithiated 2-alkyl-1-phenyl-4,5-dihydroimidazoles with benzoic esters (and pyridine analogs) leads to acylketene N,N-acetals having the structure of 2-phenacylideneimidazolidines. The E configuration of these compounds with an exocyclic double bond was substantiated by NOE experiments. With hydroxylamine hydrochloride these "endiaminones" undergo ring transformation to give 5-(2-aminoethylamino) isoxazoles which were characterized by spectrometric methods.
将 2-苯基亚
氨基
咪唑烷环转化为 5-(2-
氨基乙基)
氨基
异噁唑 锂化的 2-烷基-
1-苯基-4,5-二氢咪唑与
苯甲酸酯(和
吡啶类似物)反应,生成具有 2-苯基亚
氨基
咪唑烷结构的酰基
乙烯 N,N-
乙醛。NOE 实验证实了这些化合物具有外环双键的 E 构型。在
盐酸羟胺的作用下,这些 "内
氨基酮 "发生环状转变,生成 5-(2-
氨基乙基
氨基)
异噁唑,并通过光谱方法对其进行了表征。