three-step sequence for the conversion of hydrazides into pyridines is reported in which the key steps are N−H insertion by a copper carbene intermediate derived from α-diazo-β-ketoesters into the hydrazide, reaction with ammonium acetate to give 1,2,4-triazines, followed by Diels−Alder reaction with norbornadiene.
据报道,酰
肼转化为
吡啶的简单,新的三步过程,其中关键步骤是将衍生自α-重氮-β-
酮酸酯的
铜卡宾中间体将N-H插入酰
肼中,并与
乙酸铵反应生成
氨。得到
1,2,4-三嗪,然后与降
冰片二烯进行狄尔斯-阿尔德反应。