Ammonium chloride as a very inexpensive and readily available reagent efficiently catalyzes one-pot, three-component Groebke condensation reactions of aldehydes, isocyanides, and 2-aminopyridines or 2-aminopyrimidines in methanol to afford the corresponding imidazo[1,2- a ]pyridines in high yields at room temperature.
氯化铵是一种非常便宜且易于获得的试剂,可有效催化醛,异氰酸酯和2-氨基吡啶或2-氨基嘧啶在甲醇中的一锅三组分 Groebke 缩合反应,得到相应的咪唑并[1,2- a ]吡啶在室温下高产量。