反应详情

To a stirred solution of the product of Step A (0.05 g, 0.19 mmol) and K2CO3 (0.05 g, 0.36 mmol) in anhydrous DMF (5 ml) ethyl-bromo acetate (0.025 ml, 0.22 mmol) was added at room temperature. The mixture was stirred for 2 h and quenched with saturated NH4Cl solution, extracted in EtOAc (100 ml) and washed with H2O. The organic layer was separated and dried over MgSO4 and filtered. The filtrate was evaporated to dryness to give the title compound (0.07 g; 100%), as pale oil. 1H-NMR (CDCl3) 7.10 (d, 2H, J=8.39 Hz); 6.97 (d, 1H, J=8.46 Hz); 6.80 (t, 2H, J=8.36 Hz); 6.35-6.33 (m, 2H); 4.75-4.71 (m, 1H); 4.56 (s, 2H); 4.22 (q, 2H, J=14.36, 7.17 Hz); 3.72 (s, 3H, OMe); 3.2-3.13 (m, 1H); 2.79-2.69 (m, 3H); 2.0-1.87 (m, 2H); 1.26 (t, 3H, J=7.12 Hz).

1. customquenched with saturated NH4Cl solution
2. extractionextracted in EtOAc (100 ml)
3. washwashed with H2O
4. customThe organic layer was separated
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. customThe filtrate was evaporated to dryness