1-{3-chloro-5-(ethoxycarbonyl)-6-[(2-oxopyrrolidin-1-yl)methyl]pyridin-2-yl}piperidine-4-carboxylic acid   、                                                                                      
1-(2,4-difluorphenyl)methanesulfonamide                                                                                                                                                                                                                                                                                                          以to give ethyl 5-chloro-6-(4-{[(2,4-difluorobenzyl)sulfonyl]carbamoyl}piperidin-1-yl)-2-[(2-oxopyrrolidin-1-yl)methyl]nicotinate的产率得到ethyl 5-chloro-6-(4-{[(2,4-difluorobenzyl)sulfonyl]carbamoyl}piperidin-1-yl)-2-[(2-oxopyrrolidin-1-yl)methyl]nicotinate