反应详情

To 5-(benzo[4,5]imidazo[1,2-a]pyrimidin-2-yl)pent-4-yn-1-ol (20 mg, 0.08 mmol) in 1 mL dry DCM at 0° C. was added (Diethylamino)sulfur trifluoride (64 mg, 0.4 mmol) dropwise. The reaction was warmed to rt and stirred for 1 h and quenched onto a mixture of ice (10 g) in saturated Na2CO3 (10 mL). The mixture was extracted with EtOAc (2×10 mL) and the organic phase was dried over MgSO4 and concentrated. The residue was purified by silica chromatography (EtOAc in DCM, 5% to 50%) to afford 2-(5-fluoropent-1-yn-1-yl)benzo[4,5]imidazo[1,2-a]pyrimidine as a yellow oil (3 mg, 15%). 1H NMR (400 MHz, CDCl3): δ 8.65 (d, J=6.8 Hz, 1H), 8.03 (d, J=8 Hz, 1H), 7.85 (d, J=8 Hz, 1H), 7.58 (m, 1H), 7.43 (m, 1H), 6.93 (d, J=7.2 Hz, 1H), 4.69 (t, J=5.6 Hz, 1H), 4.57 (t, J=5.6 Hz, 1H), 2.70 (t, J=5.6 Hz, 2H), 2.14-2.00 (m, 2H); MS (ESI) m/z [M+H]+254.

1. customquenched onto a mixture of ice (10 g) in saturated Na2CO3 (10 mL)
2. extractionThe mixture was extracted with EtOAc (2×10 mL)
3. dry with materialthe organic phase was dried over MgSO4
4. concentrationconcentrated
5. customThe residue was purified by silica chromatography (EtOAc in DCM, 5% to 50%)