2-苯基-5-(三氟甲基)唑-4-羧酸 、
1-ethyl-5-nitro-1H-pyrazolo[3,4-b]pyridin-3-ylamine 、 2-phenyl-5-trifluoromethyl-oxazole-4-carboxylic acid (3-amino-1-propyl-1H-indazol-5-yl)-amide 在
crude product 、 silica gel 作用下,
生成 2-phenyl-5-trifluoromethyl-oxazole-4-carboxylic acid (3-amino-1-ethyl-1H-pyrazolo[3,4-b]pyridin-5-yl)-amide