1'-[(2-amino-7-methoxy-1-benzothiophen-3-yl)carbonyl]-6-(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)spiro[chromene-2,4'-piperidin]-4(3H)-one   、                                                                                      
三氟乙酸酐                                                                                                                                                              在
                                                                                                                                                                                 
吡啶                                                                                                                                  作用下,
                                                                                                                                                                                        反应 3.0h,
                                                                                                                以67%的产率得到2,2,2-trifluoro-N-(7-methoxy-3-{[4-oxo-6-(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)-3,4-dihydro-1'H-spiro[chromene-2,4'-piperidin]-1'-yl]carbonyl}-1-benzothiophen-2-yl)acetamide