3-Bromophenol → 3-(4,5-difluoro-2-hydroxyphenyl)-1-(diphenylmethyl)-3-hydroxy-1,3-dihydro-2H-indol-2-one

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Following the procedure as described in PREPARATION 2A and making non-critical variations using 3,4-difluorophenol to replace 3-bromophenol, and 1-(diphenylmethyl)-1H-indole-2,3-dione to replace 1-((5-(trifluoromethyl)furan-2-yl)methyl)indoline-2,3-dione, 3-(4,5-difluoro-2-hydroxyphenyl)-1-(diphenylmethyl)-3-hydroxy-1,3-dihydro-2H-indol-2-one was obtained (61%) as a colorless solid: 1H NMR (300 MHz, CDCl3) δ9.23 (br s, 1H), 7.47-7.44 (m, 1H), 7.35-7.21 (m, 9H), 7.18-7.11 (m, 2H), 6.90 (s, 1H), 6.83 (dd, J=11.2, 6.9 Hz, 1H), 6.67 (dd, J=11.2, 8.7 Hz, 1H), 6.56-6.51 (m, 1H), 4.13 (br s, 1H); MS (ES+) m/z 426.2 (M−17).

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