(2'S,4R,4a'S,9a'R)-2-amino-7'-bromo-2'-ethoxy-1-methyl-1',2',3',4',4a',9a'-hexahydrospiro[imidazole-4,9'-xanthen]-5(1H)-one 、
3-氰基-5-氟-苯基硼酸 在
四(三苯基膦)钯 sodium carbonate 作用下,
以
1,4-二氧六环 为溶剂,
以25%的产率得到3-((2'S,4R,4a'S,9a'R)-2-amino-2'-ethoxy-1-methyl-5-oxo-1,1',2',3',4',4a',5,9a'-octahydrospiro[imidazole-4,9'-xanmene]-7'-yl)-5-fluorobenzonitrile trifluoroacetate