、 ethyl orthoformate 、
乙酸酐 、
ethyl 2-[6-(3-acetylamino-1-pyrrolidinyl)-2-chloro-5-fluoronicotinoyl]-3-ethoxyacrylate 、
环丙胺 以to give ethyl 2-[6-(3-acetylamino-1-pyrrolidinyl)-2-chloro-5-fluoronicotinoyl]-3-cyclopropylaminoacrylate (0.43 g) as an amorphous powder, m.p. 71°-75° C.的产率得到ethyl 2-[6-(3-acetylamino-1-pyrrolidinyl)-2-chloro-5-fluoronicotinoyl]-3-cyclopropylaminoacrylate