3-(7-chloro-6-hydroxy-2,3-dihydro-1,4-benzodioxin-5-yl)-1-(diphenylmethyl)-1,3-dihydro-2H-indol-2-one 、
2-fluoro-4-hydroxy-5-[1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrile 以6-chloro-1′-(diphenylmethyl)-2,3-dihydrospiro[furo[3,2-f][1,4]benzodioxine-9,3′-indol]-2′(1′H)-one was obtained (65%) as a colorless solid的产率得到6-chloro-1'-(diphenylmethyl)-2,3-dihydrospiro[furo[3,2-f][1,4]benzodioxine-9,3'-indol]-2'(1'H)-one