Picolinic acid → Ethyl 3-oxo-3-(pyridin-2-yl)propanoate

Temperature

0 °C

A solution of isopropylmagnesium bromide (2M in Et2O; 36.5 mL, 73.0 mmol) was added to 4.36 mL (36.6 mmol) of malonic acid monoethyl ester in 30 mL of THF under N2 at 0° C. The reaction was stirred at 0° C. for 30 min, at room temperature for 30 min, and then at 40° C. for 30 min. The mixture was subsequently cooled to 0° C. and a imidazol-1-yl-pyridin-2-yl-methanone solution (prepared by stirring 3.00 g (24.3 mmol) of pyridine-2-carboxylic acid with 4.7 g (29 mmol) of CDI in 30 mL of THF for 12 h) was slowly added. The reaction was allowed to warm to room temperature and stirred for 12 h. The mixture was then poured into ice cold 1M H3PO4 (150 mL). Solid NaHCO3 was added to the mixture until the pH reached 7. The mixture was extracted with EtOAc (3×100 mL). The combined organic extracts were washed with NaHCO3 (100 mL) and brine, dried with MgSO4, filtered, and concentrated to provide 2.5 g ethyl 3-oxo-3-pyridin-2-yl-propionate as an oil.

1. waitat 40° C. for 30 min
2. temperatureThe mixture was subsequently cooled to 0° C.
3. temperatureto warm to room temperature
4. stirringstirred for 12 h
5. extractionThe mixture was extracted with EtOAc (3×100 mL)
6. washThe combined organic extracts were washed with NaHCO3 (100 mL) and brine
7. dry with materialdried with MgSO4
8. filtrationfiltered
9. concentrationconcentrated

ORD record

ord-595d0019fe2b433984e482300e8f0dfd

Source dataset

uspto-grants-2007_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07214802B2