反应详情

To a solution of TMEDA (660 μL, 2.58 mmol) in ether (20 mL) at −78° C. was added a solution of n-butyl lithium in ether (2.5 M, 1.76 mL, 4.40 mmol). After 30 minutes at −78° C., 3-chloropyridine (419 μL, 4.40 mmol) was added. After another 2 hours at −78° C., DMF (375 μL, 4.84 mmol) was added. After a further 2 hours at −78° C., the reaction was quenched with saturated aqueous NaHCO3 (20 mL), extracted with ether (4×15mL), 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 crystalline solid (168 mg, 27%). 1H NMR (CDCl3) 7.45 (dd, 1H, J=8.3, 4.4 Hz), 7.83 (dd, 1H, J=4.8, 1.4 Hz), 8.70 (dd, 1H, J=4.8, 1.5 Hz), 10.28 (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 (4×15mL)
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)