Methanol → HCID 589496, compound

Reaction equation

[O:1]=[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH2:4][CH:3]1[CH2:11][C:12]([OH:14])=[O:13].S(=O)(=O)(O)O.[CH3:20]O>O>[CH3:20][O:13][C:12](=[O:14])[CH2:11][CH:3]1[CH2:4][C:5]2[C:10](=[CH:9][CH:8]=[CH:7][CH:6]=2)[C:2]1=[O:1]

Participants

Procedure

To a solution of (1-Oxo-indan-2-yl)-acetic acid (Step 1, 2.00 g) in methanol (10 mL) at 0° C. was added sulphuric acid (2 mL). The solution was stirred for 2 h and then diluted with water (50 mL) and extracted with ethyl acetate. The combined organic layers were washed with sat. sodium hydrogenocarbonate, dried and concentrated to give (1-Oxo-indan-2-yl)-acetic acid methyl ester (pale yellow oil, 2.15 g, quantitative). C12H12O3; MW: 204.23; LCMS (method A) RT 1.40 min; ES 227 (25%, MNa+), 205 (25%, MH+), 173 (100%); IR: 2952, 1734, 1710, 1608, 1436 cm−1; 1H NMR (400 MHz, CDCl3) 7.78 (1H, d), 7.61 (1H, t), 7.47 (1H, d), 7.39 (1H, t), 3.70 (3H, s), 3.47 (1H, dd), 2.95-3.08 (2H, m), 2.89 (1H, dd), 2.63 (1H, dt) ppm. The compound was used without further purification for the next step