反应详情

Following the procedure as described in EXAMPLE 2, and making non-critical variations using ethyl (4′-bromo-5,6-difluoro-2′-oxospiro[1-benzofuran-3,3′-indol]-1′(2′ H)-yl)acetate to replace ethyl (2′-oxospiro[furo[2,3-f][1,3]benzodioxole-7,3′-indol]-1′(2′H)-yl)acetate, the title compound was obtained in 100% yield. The product was used directly in the next step.