Pyridine → HCID 18368188, compound

Participants

Reaction Steps

To a solution of 3-acetylamino-5-amino-2-benzoyl-1-ethoxycarbonylindole (Example 99, step 1: 100 mg, 0.27 mmol) in dichloromethane (5 ml) and pyridine (33 μl, 0.41 mmol) was added methanesulfonyl chloride (25 μl, 0.32 mmol) and the mixture was stirred for 1 h. The mixture was partitioned between 2N aqueous HCl (30 ml) and ethyl acetate (30 ml), the organic layer separated and washed cocnsecutively with brine (10 ml), saturated aqueous sodium bicarbonate (10 ml), brine (10 ml) and dried (MgSO4). After removal of solvent the residue was diluted with ethanol (10 ml) and water (5 ml), and potassium hydroxide (0.5 g) added. The mixture was stirred for 4 h, poured into a saturated aqueous ammonium chloride (30 ml) and extracted with ethyl acetate (50 ml×2). The organic layer was washed with brine (50 ml), dried (MgSO4), and solvent removed by evaporation. The residue was recrystallized from methanol/dichloromethane/hexane to give 66 mg of the title compound as a yellow solid. m.p.: 260-261° C. 1H-NMR (DMSO-d6) δ: 11.7 (1H, br s), 9.63 (1H, s), 7.81-8.22 (2H, m), 7.40-7.64 (7H, m), 2.90 (3H, s), 164 (3H, s).

Provenance & Evidence