1-tert-butyl 2-methyl (2S,4R)-4-[(4-chloro-7-methoxyquinazolin-6-yl)oxy]pyrrolidine-1,2-dicarboxylate   、                                                                                      
3-氯-2-氟苯胺                                                                                                                                                                                                                                                                                                          以to give methyl(4S)-4-({4-[(3-chloro-2-fluorophenyl)amino]-7-methoxyquinazolin-6-yl}oxy)-L-prolinate hydrochloride (4)的产率得到methyl (4R)-4-({4-[(3-chloro-2-fluorophenyl)amino]-7-methoxyquinazolin-6-yl}oxy)-L-prolinate hydrochloride