Tert-butyl 4-(4-(3-ethynylimidazo[1,2-a]pyridin-6-yl)benzoyl)piperazine-1-carboxylate 、
4-Bromo-N-(pyridin-3-YL)pyridin-2-amine 在
tert-butyl 4-(4-(3-((2-(pyridin-3-ylamino)pyridin-4-yl)ethynyl)imidazo[1,2-a]pyridin-6-yl)benzoyl)piperazine-1-carboxylate 、 crude product 、 silica gel 、
chloroform methanol 作用下,
以to afford tert-butyl 4-(4-(3-((2-(pyridin-3-ylamino)pyridin-4-yl)ethynyl)imidazo[1,2-a]pyridin-6-yl)benzoyl)piperazine-1-carboxylate (200 mg, 14.7%) as a brown solid的产率得到tert-butyl 4-(4-(3-((2-(pyridin-3-ylamino)pyridin-4-yl)ethynyl)imidazo[1,2-a]pyridin-6-yl)benzoyl)piperazine-1-carboxylate