(3S)-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-one 、 5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-one 、
2-溴甲基-5-三氟甲基呋喃 、
5-(chloromethyl)-2-methoxypyrimidine 以(3S)-1′-{[5-(trifluoromethyl)furan-2-yl]methyl}-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one was obtained (83%) as a colorless solid的产率得到(3S)-1'-((5-(trifluoromethyl)furan-2-yl)methyl)-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-one