3-(2,2-difluoro-6-hydroxy-1,3-benzodioxol-5-yl)-1-{[3-(trifluoromethyl)pyridin-2-yl]methyl}-1,3-dihydro-2H-indol-2-one 、
1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one 以2,2-difluoro-1′-{[3-(trifluoromethyl)pyridin-2-yl]methyl}spiro[furo[2,3-f][1,3]benzodioxole-7,3′-indol]-2′(1′H)-one was obtained (23%) as a colorless solid的产率得到2,2-difluoro-1'-{[3-(trifluoromethyl)pyridin-2-yl]methyl}spiro[furo[2,3-f][1,3]benzodioxole-7,3'-indol]-2'(1'H)-one