反应详情

11.5 g (0.053 mol) of 3-methoxy-4-nitrobenzoyl chloride and 7.8 ml (0.056 mol) of triethylamine are added to 3 g (0.025 mol) of imidazo[1,5-a]pyridine [described in J. Chem. Soc., (1955), 2834-2836] dissolved in 100 ml of 1,2-dichloroethane. The mixture is stirred at ambient temperature for 2 hours. The reaction medium is concentrated under reduced pressure and the residue is then taken up in dichloromethane and a saturated aqueous sodium bicarbonate solution. The organic phase is separated by settling, washed with a saturated aqueous sodium chloride solution, dried over sodium sulfate and concentrated under reduced pressure. The residue is taken up in dichloromethane and purified by filtration through a bed of silica gel. After evaporation, 7.1 g of a yellow solid are collected. Melting point: 183° C.; 1H NMR (d6-DMSO): 4.01 (3H, s), 7.35-7.40 (1H, m), 7.47-7.54 (1H, m), 7.97 (1H, s), 8.06-8.11 (3H, m), 8.15 (1H, s), 9.77 (1H, d).

1. concentrationThe reaction medium is concentrated under reduced pressure
2. customThe organic phase is separated
3. washwashed with a saturated aqueous sodium chloride solution
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated under reduced pressure
6. filtrationpurified by filtration through a bed of silica gel
7. customAfter evaporation, 7.1 g of a yellow solid
8. customare collected