反应详情

A solution of methyllithium (1.6 M in diethyl ether, 17.4 mL, 27.9 mmol) was added dropwise over 12 min to a stirred solution of ethyl 2-(2-(tert-butoxycarbonylamino)pyridin-4-yl)acetate (45) (1.56 g, 5.58 mmol) in THF (140 mL) under nitrogen at −78° C. After 3 hr isopropanol (5.0 mL) was added and the reaction mixture was partitioned between water and EtOAc. The aqueous layer was extracted twice with EtOAc and the combined organic extracts were washed with brine then dried (MgSO4) and evaporated in vacuo. The residue was purified by flash column chromatography (SiO2, 80 g, 0-80% EtOAc in isohexane, gradient elution) to afford the title compound (46) (300 mg, 21%) as a white solid: m/z 251.0 (M+H)+ (ES+).

1. customthe reaction mixture was partitioned between water and EtOAc
2. extractionThe aqueous layer was extracted twice with EtOAc
3. washthe combined organic extracts were washed with brine
4. dry with materialthen dried (MgSO4)
5. customevaporated in vacuo
6. customThe residue was purified by flash column chromatography (SiO2, 80 g, 0-80% EtOAc in isohexane, gradient elution)