反应详情

To a solution of freshly prepared LDA (11.40 mmol) in THF (7 mL) at -78° C. was added slowly 3-bromo-4-butylthiophene of Example 1(a) (2.50 g, 11.40 mmol) in THF (10 mL). After stirring for 15 min, DMF (0.94 mL, 12.10 mmol) in THF (2 mL) was dropwise added. The resulting mixture was stirred for 1 h at -78° C. and then allowed to warm to room temperature. The reaction was quenched with water and extracted with EtOAc (2×50 mL). The combined organic extracts were washed with H2O, brine and dried (MgSO4). After removing the solvent under reduced pressure, column chromatography (silica gel, EtOAc/Hexane, 20:80) of the residue afforded the title compound as an oil (1.87 g, 60%).

1. stirringThe resulting mixture was stirred for 1 h at -78° C.
2. customThe reaction was quenched with water
3. extractionextracted with EtOAc (2×50 mL)
4. washThe combined organic extracts were washed with H2O, brine
5. dry with materialdried (MgSO4)
6. customAfter removing the solvent under reduced pressure, column chromatography (silica gel, EtOAc/Hexane, 20:80) of the residue