Sulfuric Acid → HCID 57781091, compound

Participants

Reaction Steps

Crude 2-(2-hydroxy-1-imidazol-1-yl-2-methyl-propyl)-benzonitrile (1.75 g) is dissolved in dioxane (15 mL) and water (15 mL). Sulfuric acid (1.5 mL, 29.0 mmol) is added and the mixture is stirred at reflux for 2 h. After cooling down, the pH is adjusted with solid sodium bicarbonate. The mixture is extracted with ethyl acetate and the combined organic phase is washed with water, dried over Na2SO4 and concentrated in vacuo. The residue is purified by silica gel chromatography (dichloromethane-methanol, 19:1) to give 4-(imidazol-1-yl)-3,3-dimethyl-isochroman-1-one; MS (ESI) m/z 242.9 (M+H); 1H NMR (400 MHz, MeOD) δ ppm. 1.30 (s, 3 H), 1.53 (s, 3 H), 5.76 (s, 1 H), 6.98 (s, 1 H), 7.09 (s, 1 H), 7.52 (d, J=7.6 Hz, 1 H), 7.64-7.73 (m, 1 H), 7.76-7.85 (m, 1 H), 7.89 (s, 1 H), 8.25 (dd, J=7.7, 1.4 Hz, 1 H).

Provenance & Evidence