3,4-Dimethylphenol → 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

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Following the procedure as described in PREPARATION 6A, and making non-critical variations using 2,3-dihydrobenzo[b][1,4]dioxin-6-ol to replace 3,4-dimethylphenol, and 6-{[5-(trifluoromethyl)furan-2-yl]methyl}-2,3-dihydro-6H-[1,4]dioxino[2,3-f]indole-7,8-dione to replace 1-(diphenylmethyl)-1H-indole-2,3-dione, 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 was obtained (80%): 1H NMR (300 MHz, CDCl3) δ8.78 (s, 1H), 7.07-6.97 (m, 1H), 6.71-6.65 (m, 1H), 6.60-6.55 (m, 1H), 6.51-6.47 (m, 1H), 6.40-6.35 (m, 1H), 6.31-6.25 (m, 1H), 4.89-4.69 (m, 2H), 4.34-4.04 (m, 9H); MS (ES+) m/z 487.9 (M−17).

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