3-methylspiro[furo[2,3-f][1,3]benzoxazole-7,3'-indole]-2,2'(1'H,3H)-dione 、 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3-methyl-1′-{[5-(trifluoromethyl)furan-2-yl]methyl}spiro[furo[2,3-f][1,3]benzoxazole-7,3′-indole]-2,2′(1′H,3H)-dione was obtained (59%) as a colorless solid的产率得到3-methyl-1'-{[5-(trifluoromethyl)furan-2-yl]methyl}spiro[furo[2,3-f][1,3]benzoxazole-7,3'-indole]-2,2'(1'H,3H)-dione