光气   、                                                                                      
1-ethyl-3-{5'-(hydrazinylcarbonyl)-2'-(tetrahydro-2H-pyran-4-ylmethoxy)-4-[4-(trifluoromethyl)-1,3-thiazol-2-yl]-3,3'-bipyridin-6-yl}urea                                                                                                                                                              在
                                                                                                                                                                                 crude compound   、                                                                                                  
乙醚   、                                                                                                  
正戊烷                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以to afford 200 mg (48%) of 1-ethyl-3-{5′-(5-oxo-4,5-dihydro-1,3,4-oxadiazol-2-yl)-2′-(tetrahydro-2H-pyran-4-ylmethoxy)-4-[4-(trifluoromethyl)-1,3-thiazol-2-yl]-3,3′-bipyridin-6-yl}urea的产率得到1-ethyl-3-{5'-(5-oxo-4,5-dihydro-1,3,4-oxadiazol-2-yl)-2'-(tetrahydro-2H-pyran-4-ylmethoxy)-4-[4-(trifluoromethyl)-1,3-thiazol-2-yl]-3,3'-bipyridin-6-yl}urea