反应详情

4-Chloro-pyridine-2-carboxylic acid methylester (200 mg, 1.17 mmol) and MgCl2 (555 mg, 0.58 mmol) are suspended in THF (5 mL) at rt. The mixture is stirred for 5 min and then pyrrolidine (193 μL, 2.33 mmol) is added and the mixture stirred for an additional 15 min. It is worked up by addition of aqueous HCl solution (1M, 1.2 mL) and extraction with ethyl acetate. The combined organic extracts are washed with brine dried over MgSO4. The volatiles are removed under reduced pressure to give the title compound as a yellow oil: C10H11ClN2O: M+=211.3; 1H-NMR (DMSO-d6): 8.55 (d, 1H), 7.82 (s, 1H), 7.59 (d, 1H), 3.62-3.42 (m, 4H), 1.93-1.75 (m, 4H).

1. stirringthe mixture stirred for an additional 15 min
2. washThe combined organic extracts are washed with brine
3. dry with materialdried over MgSO4
4. customThe volatiles are removed under reduced pressure