1-{3-cyano-5-(isopropoxycarbonyl)-6-[(2-oxopyrrolidin-1-yl)methyl]pyridin-2-yl}piperidine-4-carboxylic acid   、                                                                                      
Oxan-4-ylmethanesulfonamide                                                                                                                                                                                                                                                                                                          以to give isopropyl 5-cyano-2-[(2-oxopyrrolidin-1-yl)methyl]-6-(4-{[(tetrahydro-2H-pyran-4-ylmethyl)sulfonyl]carbamoyl}piperidin-1-yl)nicotinate的产率得到isopropyl 5-cyano-2-[(2-oxopyrrolidin-1-yl)methyl]-6-(4-{[(tetrahydro-2H-pyran-4-ylmethyl)sulfonyl]carbamoyl}piperidin-1-yl)nicotinate