The reaction between 4-dimethylaminopyridine (DMAP) and 2-bromoacetophenone(s) readily gives 1- [2-(4-substitutedphenyl)-2-oxoethyl]-4-(dimethylamino)pyridinium bromide (1–14). Action of aqueous NaOH on 1–8 generates the corresponding pyridinium ylide (15–22), which is isolated as a colored stable crystalline solid. Addition of 15–22 to dimethylacetylene dicarboxylate (DMAD) gives dimethyl 3-(subs
4-二甲基
氨基吡啶(
DMAP)与
2-溴苯乙酮之间的反应可轻松制得1- [2-(4-取代苯基)-2-氧代乙基] -4-(二甲基
氨基)
吡啶鎓
溴化物(1-14)。NaOH
水溶液对1–8的作用生成相应的
吡啶鎓叶立德(15–22),将其分离为有色稳定的结晶固体。将15-22加到二甲基
乙炔二
羧酸酯(
DMAD)中,可以以46-62%的收率得到3-(取代的苯甲酰基)-7-(
二甲氨基)
吲哚嗪-1,2-二
羧酸二甲酯(23-30)。