diisopropyl 2-(ethoxymethylene)malonate 、 tert-butyl 1-(2-cyanoethanimidoyl)piperidine-4-carboxylate 以to give isopropyl 6-[4-(tert-butoxycarbonyl)piperidin-1-yl]-5-cyano-2-oxo-1,2-dihydropyridine-3-carboxylate的产率得到isopropyl 6-[4-(tert-butoxycarbonyl)piperidin-1-yl]-5-cyano-2-oxo-1,2-dihydropyridine-3-carboxylate