8-hydroxy-8-(6-hydroxy-2,3-dihydrobenzofuran-5-yl)-6-((5-(trifluoromethyl)furan-2-yl)methyl)-6,8-dihydro-2H-[1,4]dioxino[2,3-f]indol-7(3H)-one → 8-(7-hydroxy-2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-6-((5-(trifluoromethyl)furan-2-yl)methyl)-6,8-dihydro-2H-[1,4]dioxino[2,3-f]indol-7(3H)-one

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Following the procedure as described in PREPARATION 26C, and making non-critical variations using 8-hydroxy-8-(7-hydroxy-2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-6-((5-(trifluoromethyl)furan-2-yl)methyl)-6,8-dihydro-2H-[1,4]dioxino[2,3-f]indol-7(3H)-one to replace 8-hydroxy-8-(6-hydroxy-2,3-dihydrobenzofuran-5-yl)-6-((5-(trifluoromethyl)furan-2-yl)methyl)-6,8-dihydro-2H-[1,4]dioxino[2,3-f]indol-7(3H)-one, 8-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-6-{[5-(trifluoromethyl)furan-2-yl]methyl}-2,3,6,8-tetrahydro-7H-[1,4]dioxino[2,3-f]indol-7-one was obtained (89%): 1H NMR (300 MHz, CDCl3) δ8.46 (s, 1H), 6.86 (s, 1H), 6.69 (d, J=2.9 Hz, 1H), 6.61 (s, 1H), 6.54 (s, 1H), 6.45 (s, 1H), 6.29 (d, J=2.9 Hz, 1H), 4.95 (s, 1H), 4.89-4.74 (m, 2H), 4.31-4.06 (m, 8H).

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