tert-butyl 4-((4-(5-bromopyrazin-2-yl)piperidin-1-yl)sulfonyl)tetrahydro-2H-pyran-4-carboxylate   、                                                                                      
2,2,3,3,3-五氟-1-丙醇                                                                                                                                                              在
                                                                                                                                         
18-冠醚-6                                                                                                                                                                                                                               potassium carbonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         DMF (N,N-dimethyl-formamide)                                                                                  为溶剂,
                                                                                                                                                                                        以89%的产率得到tert-butyl 4-((4-(5-(2,2,3,3,3-pentafluoropropoxy)pyrazin-2-yl)piperidin-1-yl)sulfonyl)tetrahydro-2H-pyran-4-carboxylate