3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-4,7-dimethoxy-1-[2-(2-methoxyethoxy)ethyl]-1,3-dihydro-2H-indol-2-one 、
1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one 以4′,7′-dimethoxy-1′-[2-(2-methoxyethoxy)ethyl]-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one was obtained (24%)的产率得到4',7'-dimethoxy-1'-[2-(2-methoxyethoxy)ethyl]-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2'(1'H)-one