、                                                                                      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