n-butylphenylketene 、
菲醌 在
(S)-5-{bis[3,5-bis(trifluoromethyl)phenyl](hydroxy)methyl}-2-phenyl-6,7-dihydro-5H-pyrrolo[2,1-c]-1,2,4-triazol-2-ium tetrafluoroborate 、
caesium carbonate 作用下,
以
甲苯 为溶剂,
生成
(R)-3-butyl-3-phenylphenanthro[9,10-b][1,4]dioxin-2(3H)-one 、 (S)-3-butyl-3-phenylphenanthro[9,10-b][1,4]dioxin-2(3H)-one