3-(4-bromo-2-hydroxyphenyl)-3-hydroxy-1-{[5-(trifluoromethyl)furan-2-yl]methyl}-1,3-dihydro-2H-indol-2-one → 3-(4,5-difluoro-2-hydroxyphenyl)-1-(diphenylmethyl)-1,3-dihydro-2H-indol-2-one

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Following the procedure as described in PREPARATION 2B, and making non-critical variations using 3-(4,5-difluoro-2-hydroxyphenyl)-1-(diphenylmethyl)-3-hydroxy-1,3-dihydro-2H-indol-2-one to replace 3-(4-bromo-2-hydroxyphenyl)-3-hydroxy-1-{[5-(trifluoromethyl)furan-2-yl]methyl}-1,3-dihydro-2H-indol-2-one, 3-(4,5-difluoro-2-hydroxyphenyl)-1-(diphenylmethyl)-1,3-dihydro-2H-indol-2-one was obtained (56%) as an off-white solid: 1H NMR (300 MHz, CDCl3) δ9.27 (br s, 1H), 7.37-7.12 (m, 12H), 6.94 (s, 1H), 6.87 (dd, J=11.3, 7.1 Hz, 1H), 6.76 (dd, J=11.2, 8.9 Hz, 1H), 6.58-6.56 (m, 1H), 5.12 (s, 1H); MS (ES+) m/z 428.2 (M+1).

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