2,3-二氨基吡啶 、
ethyl 4-(2-ethoxy-2-iminoethyl)-1-piperidinecarboxylate monohydrochloride 在
potassium carbonate 、 silica gel 、 Dichloromethane methanol ammonium hydroxide 作用下,
以
甲醇 为溶剂,
反应 72.0h,
以yielding 7.6 g of ethyl 4-[(1H-imidazo[4,5-b]pyridin-2-yl)methyl]-1-piperidinecarboxylate (52%) (interm. 9)的产率得到ethyl 4-[(1H-imidazo[4,5-b]pyridin-2-yl)-methyl]-1-piperidinecarboxylate