反应详情

A solution of 5-(2-fluoro-4-iodo-phenylamino)-imidazo[1,5-a]pyridine-6-carboxylic acid ((S)-2,2-dimethyl-[1,3]dioxolan-4-ylmethoxy)-amide (364 mg, 0.7 mmol) in methanol (0.5 ml) and dichloromethane (0.5 ml) was loaded onto an SCX-2 cartridge. The cartridge was flushed with methanol and the desired product was eluted using a 2M solution of ammonia in methanol. The appropriate fractions were combined and concentrated under reduced pressure and the residue was azeotroped with dichloromethane. Purification of the resultant residue by flash chromatography (Si-PPC, gradient 0% to 10%, methanol in dichloromethane) followed by preparative HPLC (Gemini 5 micron C6-Phenyl 250×21.20 mm column, 20 mmol Et3N per litre solvent, gradient acetonitrile/water, 5 to 98%, ramp time 25 minutes) afforded the title compound as a yellow solid (77.6 mg, 23%). LCMS (method A): RT=5.13 min, [M+H]+=487. 1H NMR (DMSO-d6): 8.01 (1 H, s), 7.58 (1 H, dd, J=10.68, 1.92 Hz), 7.42 (1 H, s), 7.38 (1 H, d, J=9.34 Hz), 7.30 (1 H, dd, J=8.43, 1.82 Hz), 6.91 (1H, d, J=9.32 Hz), 6.32 (1 H, t, J=8.68 Hz), 3.72-3.67 (1 H, m), 3.60-3.51 (2 H, m), 3.30 (2H, d, J=4.94 Hz).

1. customThe cartridge was flushed with methanol
2. washthe desired product was eluted
3. concentrationconcentrated under reduced pressure
4. customthe residue was azeotroped with dichloromethane
5. customPurification of the resultant residue by flash chromatography (Si-PPC, gradient 0% to 10%, methanol in dichloromethane)