ethyl 5-cyano-6-hydroxy-2-[(2-oxo-pyrrolidin-1-yl)methyl]nicotinate   、                                                                                      
N-(苄基磺酰基)氮杂丁烷-3-羧酰胺                                                                                                                                                                                                                                                                                                          以to give ethyl 6-{3-[(benzylsulfonyl)carbamoyl]azetidin-1-yl}-5-cyano-2-[(2-oxopyrrolidin-1-yl)methyl]nicotinate的产率得到ethyl 6-{3-[(benzylsulfonyl)carbamoyl]azetidin-1-yl}-5-cyano-2-[(2-oxopyrrolidin-1-yl)methyl]nicotinate