2-(溴甲基)吡啶氢溴酸盐 、
2-(bromomethyl)tetrahydro-2H-pyran 、
2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-6-carbonitrile 、 5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-one 以2′-oxo-1′-(pyridin-2-ylmethyl)-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-6-carbonitrile was obtained (89%) as a colorless solid的产率得到2'-Oxo-1'-(pyridin-2-ylmethyl)-1',2'-dihydrospiro[1-benzofuran-3,3-indole]-6-carbonitrile