反应详情

To a solution of TMEDA (389 uL, 2.58 mmol) in THF (10 mL) at −78° C. was added a solution of n-butyl lithium in THF (2.5M, 1.03 mL, 2.58 mmol). After 30 minutes at −78° C., 3-fluoropyridine (221 uL, 2.57 mmol) was added. After another 2 hours at −78° C., DMF (219 uL, 2.83 mmol) was added. After a further 2 hours at −78° C., the reaction was quenched with saturated aqueous NaHCO3 (20 mL), extracted with ether (4×15 mL), dried (Na2SO4), filtered and concentrated in vacuo to give the crude oil. Purification by column chromatography on silica gel (Hexanes: EtOAc 4:1) afforded the title compound as a pale yellow oil (120 mg, 37%). 1H NMR (CDCl3) 7.68 (t, 1H, J=5.2 Hz), 8.62 (d, 1H, J=4.7 Hz), 8.70 (s, 1H), 10.42 (s, 1H).

1. waitAfter another 2 hours at −78° C.
2. waitAfter a further 2 hours at −78° C.
3. customthe reaction was quenched with saturated aqueous NaHCO3 (20 mL)
4. extractionextracted with ether (4×15 mL)
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customto give the crude oil
9. customPurification by column chromatography on silica gel (Hexanes: EtOAc 4:1)