反应详情

To a solution of 3-[2-(methylthio)-4-pyrimidinyl]-2-(3-nitrophenyl)pyrazolo[1,5-a]pyridine (0.82 g, 2.26 mmol) in DCM (22 mL) was added a solution of 50% mCPBA (818 mg, 2.37 mmol) in DCM (6 mL) through an addition funnel. The reaction was stirred for 10 minutes and saturated aqueous NaHCO3 and the layers were separated. The aqueous layer was extracted with DCM, and the combined organic layers were dried over MgSO4, filtered and concentrated. The residue is purified by silica gel chromatography (50% EtOAC/hexanes eluant) to provide the product (567 mg) as a yellow solid. 1H NMR (400 MHz, d6-DMSO) δ 8.93 (d, 1H, J=6.8), 8.68 (d, 1H, J=5.6), 8.57 (d, 1H, J=8.8), 8.44 (s, 1H, 8.37-8.35 (m, 1H, 8.08 (d, 1H, J=7.6), 7.78 (t, 1H, J=8.0), 7.61-7.65 (m, 1H), 7.21-7.26 (m, 2H), 2.84 (s, 3H).

1. customsaturated aqueous NaHCO3 and the layers were separated
2. extractionThe aqueous layer was extracted with DCM
3. dry with materialthe combined organic layers were dried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue is purified by silica gel chromatography (50% EtOAC/hexanes eluant)