1-(3-cyano-5-(ethoxycarbonyl)-6-ethylpyridin-2-yl)azetidine-3-carboxylic acid   、                                                                                      
(4-fluorophenyl)methanesulfonamide                                                                                                                                                                                                                                                                                                          以to give ethyl 5-cyano-2-ethyl-6-(3-{[(4-fluorobenzyl)sulfonyl]carbamoyl}azetidin-1-yl)nicotinate的产率得到ethyl 5-cyano-2-ethyl-6-(3-{[(4-fluorobenzyl)sulfonyl]carbamoyl}azetidin-1-yl)nicotinate