反应详情

Add 30% aqueous hydrogen peroxide solution (5 mL) in water (44 mL) to a solution of 1,6,7,8-Tetrahydro-1-aza-as-indacene-2,3-dione (3.80 mg, 20.3 mmol) and sodium hydroxide (5.03 g, 126 mmol) in water (97 μL) over a period of 30 minutes, stir the mixture at room temperature for 1 h. Acidulate with 1N hydrochloric acid, filter the solid, wash with water and dry to afford 4-Amino-indan-5-carboxylic acid (3.13 g, 87%). Dissolve 4-Amino-indan-5-carboxylic acid (3.07 g, 17.3 mmol) in ethyl acetate (87 mL) and ethanol (87 mL) and add (trimethylsilyl) diazomethane (17.3 mL, 34.6 mmol, 2M in hexanes) at room temperature and stir the solution for 1 hour. Remove the solvent under reduced pressure. Purify the residue by flash chromatography, eluting with hexanes/ethyl acetate, to afford the title compound (2.50 g, 76%). 1H NMR (MeOD, 300 MHz) δ 2.12 (quintuplet, J=7.6 Hz, 2H), 2.75 (t, J=7.5 Hz, 2H), 2.89 (t, J=7.5 Hz, 2H), 3.83 (s, 3H), 6.53 (d, J=8.1 Hz, 1H), 7.66 (d, J=8.1 Hz, 1H). MS (ES+): 192 (M+H).

1. customRemove the solvent under reduced pressure
2. customPurify the residue by flash chromatography
3. washeluting with hexanes/ethyl acetate