8-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-6-[2-(2-methoxyethoxy)ethyl]-2,3,6,8-tetrahydro-7H-[1,4]dioxino[2,3-f]indol-7-one 、
1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one 以6-[2-(2-methoxyethoxyl)ethyl]-2,2′,3,3′-tetrahydrospiro[1,4-dioxino[2,3-f]indole-8,8′-furo[2,3-g][1,4]benzodioxin]-7(6H)-one was obtained (74%)的产率得到6-[2-(2-methoxyethoxy)ethyl]-2,2',3,3'-tetrahydrospiro[1,4-dioxino[2,3-f]indole-8,8'-furo[2,3-g][1,4]benzodioxin]-7(6H)-one