N'-hydroxy-4-[(2'-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-1'(2'H)-yl)methyl]benzenecarboximidamide 、
三氟乙酸酐 在
乙酸乙酯 、 hexanes 作用下,
以
吡啶 为溶剂,
反应 0.5h,
以to afford 1′-{4-[5-(trifluoromethyl)-1,2,4-oxadiazol-3-yl]benzyl}-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one (0.34 g, 71%) as a colorless solid的产率得到1'-{4-[5-(trifluoromethyl)-1,2,4-oxadiazol-3-yl]benzyl}-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1H)-one