3,4-Dimethylphenol → 1-(diphenylmethyl)-3-hydroxy-3-(2-hydroxy-4,5-dimethylphenyl)-1,3-dihydro-2H-indol-2-one

Temperature

0 °C

To a stirred solution of 3,4-dimethylphenol (2.50 g, 20.5 mmol) in tetrahydrofuran (100 mL) was added isopropylmagnesium chloride (10.2 mL, 2.0 M tetrahydrofuran solution, 20.40 mmol) at 0° C. The mixture was allowed to stir for 1 h at 0° C., then the solvent was removed in vacuo. Dichloromethane (200 mL) was added, followed by the addition of 1-(diphenylmethyl)-1H-indole-2,3-dione (5.00 g, 15.95 mmol). The mixture was stirred for 54 h at ambient temperature, quenched with saturated ammonium chloride solution. The organic layer was washed with water, brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo, the residue was purified by column chromatography to give 1-(diphenylmethyl)-3-hydroxy-3-(2-hydroxy-4,5-dimethylphenyl)-1,3-dihydro-2H-indol-2-one (5.10 g, 73%): 1H NMR (300 MHz, CDCl3) δ7.49-7.45 (m, 1H), 7.35-7.27 (m, 10H), 7.08-7.04 (m, 2H), 6.93 (s, 1H), 6.81-6.75 (m, 1H), 6.52 (s, 1H), 6.49-6.46 (m, 1H), 2.15 (s, 3H), 2.02 (s, 3H); MS (ES+) m/z 418.1 (M−17).

1. customthe solvent was removed in vacuo
2. additionDichloromethane (200 mL) was added
3. stirringThe mixture was stirred for 54 h at ambient temperature
4. customquenched with saturated ammonium chloride solution
5. washThe organic layer was washed with water, brine
6. dry with materialdried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationThe filtrate was concentrated in vacuo
9. customthe residue was purified by column chromatography

ORD record

ord-6cc85aa4a6294e02a54bc9b7b74503f1

Source dataset

uspto-grants-2013_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08415370B2