A three-component condensation of 3-benzoylquinoxalin-2(1H)-one with 4-nitrobenzaldehyde and ammonium acetate in AcOH gives 2-[2-(4-nitrophenyl)-5-phenylimidazol-4-yl]benzimidazole via a rearrangement involving the fragment C(2)-C(3)-C(O)Ph of the quinoxaline system and the other two reagents, which supply the fragment -N=C(Ar)-NH- for constructing the imidazole ring. Possible pathways of this reaction are discussed.
将 3-苯甲酰基
喹喔啉-2(1H)-酮与 4-硝基
苯甲醛和
乙酸铵在 AcOH 中进行三组分缩合,通过涉及
喹喔啉体系的 C(2)-C(3)-C(O)Ph 片段和另外两种试剂的重排,得到 2-[2-(4-
硝基苯基)-5-苯基
咪唑-4-基]
苯并咪唑、提供片段 -N=C(Ar)-NH- 以构建
咪唑环。本文讨论了这一反应的可能途径。