6-fluoro-1'-(4-methoxybenzyl)-2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carbonitrile 、 6-methoxy-1'-(4-methoxybenzyl)-2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carbonitrile 以6-fluoro-2′-oxo-1,2′-dihydrospiro[1-benzofuran-3,3′-indole]-5-carbonitrile was obtained (85%)的产率得到6-fluoro-2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carbonitrile