1-benzylpiperidin-3-yl 2-(3-nitrobenzylidene)acetoacetate 、
ethyl amidinoacetate acetic acid salt 在
sodium methylate 作用下,
以
异丙醇 为溶剂,
以63.8%的产率得到2-Amino-6-methyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3,5-dicarboxylic acid 5-(1-benzyl-piperidin-3-yl) ester 3-ethyl ester