6-fluoro-2'-oxo-1'-[[3-(trifluoromethyl)pyridin-2-yl]methyl]spiro[2H-1-benzofuran-3,3'-indole]-5-carbonitrile 、 6-Fluoro-2'-oxo-1'-[2-(trifluoromethyl)benzyl]-1',2'-dihydrospiro[1-benzofuran-3,3-indole]-5-carbonitrile 以1′-((3-(trifluoromethyl)pyridin-2-yl)methyl)-1,6-dihydrospiro[furo[3,2-f]indazole-5,3′-indolin]-2′-one was obtained (47%)的产率得到1'-((3-(Trifluoromethyl)pyridin-2-yl)methyl)-1,6-dihydrospiro[furo[3,2-f]indazole-5,3'-indolin]-2'-one