1-(diphenylmethyl)-3-(5-hydroxy-2,1,3-benzoxadiazol-4-yl)-1,3-dihydro-2H-indol-2-one 、
1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one 以1′-(diphenylmethyl)spiro[furo[3,2-e][2,1,3]benzoxadiazole-8,3′-indol]-2′(1′H)-one was obtained (50%) as a colorless solid的产率得到1'-(diphenylmethyl)spiro[furo[3,2-e][2,1,3]benzoxadiazole-8,3'-indol]-2'(1'H)-one