5-Fluoro-1-indanone → HCID 86762368, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 3,5-dimethylphenylhydrazine (2.54 g, 14.7 mmol) and 5-fluoro-1-indanone (2.21 g, 14.7 mmol) in ethanol (24 mL) was added glacial acetic acid (3 drops). The solution was stirred at reflux (85° C.) for 15 minutes and cooled to room temperature. Ethanol was removed in vacuo and the resulting orange solid was dissolved in isopropanol (24 mL). Sulfuric acid (36N, 1.65 mL) was added via syringe and the mixture was stirred at reflux (90° C.) for 17 hours and subsequently cooled to room temperature. The solution was basified to pH 10 via addition of aqueous sodium hydroxide (2% by mass) resulting in the formation of a precipitate. The solid was collected by vacuum filtration to yield 47b in 76% crude yield (2.80 g, 11.2 mmol). Crude product was brought on to the next step without further purification. 1H NMR (400 MHz, CDCl3): δ 8.12 (s, 1H), 7.32-7.35 (dd, 1H, J=8.2, 5.2 Hz), 0.24-7.26 (m, 1H), 7.01-7.05 (m, 2H), 6.79 (s, 1H), 3.83 (s, 2H), 2.60 (s, 3H), 2.44 (s, 3H); 13C NMR (150 MHz, CDCl3): δ 160.7 (d, J=361.5), 150.0 (d, J=12.0 Hz), 140.9, 140.6, 131.8, 131.2, 128.9, 122.6, 122.3, 121.6 (d, J=4.5 Hz), 117.2 (d, J=13.5 Hz), 113.4 (d, J=25.5 Hz), 113.1 (d, J=25.5 Hz), 109.6, 31.7 (d, J=3.0 Hz), 21.8, 19.3; 19F NMR (CD3CD, 376 MHz): δ −117.9 (m).

Provenance & Evidence