3-甲氧基-2H-吡喃-2-酮 、
3'-(Trifluoromethyl)spiro[2,4-dioxatricyclo[7.3.1.05,13]trideca-1(12),5,7,9(13),10-pentaene-3,4'-cyclohexa-2,5-diene]-1'-one 以95%的产率得到1'-Methoxy-5'-(trifluoromethyl)spiro[2,4-dioxatricyclo[7.3.1.05,13]trideca-1(12),5,7,9(13),10-pentaene-3,6'-9-oxatricyclo[6.2.2.02,7]dodeca-4,11-diene]-3',10'-dione