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A mixture of 3-[4-(benzyloxy)-2-hydroxyphenyl]-1-(diphenylmethyl)-3-hydroxy-1,3-dihydro-2H-indol-2-one (10.0 g, 19.5 mmol), triethylsilane (15.6 mL, 97.5 mmol) and trifluoroacetic acid (15.0 mL, 195 mmol) was mixed and stirred at 0° C. for 20 min. The mixture was concentrated under vacuum. The residue was triturated with diethyl ether to afford 3-[4-(benzyloxy)-2-hydroxyphenyl]-1-(diphenylmethyl)-1,3-dihydro-2H-indol-2-one (7.40 g, 76%) as a colorless solid: 1H NMR (300 MHz, CDCl3) δ 7.44-7.25 (m, 14H), 7.23-7.17 (m 2H), 7.11-7.02 (m, 2H), 6.95 (s, 1H), 6.81 (d, J=8.6 Hz, 1H), 6.68 (d, J=2.5 Hz, 1H), 6.55-6.49 (m, 1H), 6.46 (dd, J=8.6, 2.6 Hz, 1H), 5.09 (s, 1H), 4.99 (s, 2H); MS (ES+) m/z 498.3 (M+1).

1. additionwas mixed
2. concentrationThe mixture was concentrated under vacuum
3. customThe residue was triturated with diethyl ether