反应详情

To a mixture of 2,4-dichloro-1H-benzoimidazole (0.550 g, 2.94 mmol) and THF (15 mL) was added DIPEA (1.54 mL, 8.82 mmol) followed by 1-chloromethoxy-2-methoxy-ethane (0.550 g, 4.41 mmol) at 23° C. After stirring for 18 h, EtOAc (100 mL) was added. The organic layer was washed with saturated aqueous NaHCO3 (30 mL) and brine (30 mL). The organic layers were combined, dried, filtered, and concentrated under reduced pressure. The residue was purified (FCC) (10-50% EtOAc/hexanes to yield the titled compound as a mixture of regioisomers (0.660 g, 82%). MS (ESI/CI): mass calcd. for C11H12Cl2N2O2, 274.0; m/z found, 275.1 [M+H]+. 1H NMR (500 MHz, CDCl3): 7.61 (dd, J=8.0, 1.0 Hz, 1H), 7.41 (dd, J=8.1, 0.9 Hz, 1H), 7.33 (dd, J=7.9, 1.0 Hz, 1H), 7.31-7.20 (m, 3H), 5.98 (s, 2H), 5.66 (s, 2H), 3.76-3.69 (m, 2H), 3.67-3.60 (m, 2H), 3.55-3.46 (m, 4H), 3.37 (s, 3H), 3.36 (s, 3H).

1. washThe organic layer was washed with saturated aqueous NaHCO3 (30 mL) and brine (30 mL)
2. customdried
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified (FCC) (10-50% EtOAc/hexanes