、                                                                                      
5-trifluoromethyl-3,4-dihydro-1'H-spiro(chromene-2,4'-piperidine)-1'-carboxylate hydrochloride                                                                                                                                                              在
                                                                                                                                                                                 
三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
正丁醇                                                                                  为溶剂,
                                                                                                                                                                                        以72%的产率得到1'-[6-[5-(2-pyridin-3-ylethyl)-1,3,4-oxadiazol-2-yl]pyridazin-3-yl]-5-(trifluoromethyl)spiro[3,4-dihydrochromene-2,4'-piperidine]