Potassium Iodide → 3-Hydroxy-3-(3-methoxy-2-oxo-1,2-dihydro-pyridin-4-yl)-pentanoic acid tert-butyl ester

The mixture of 3-(2,3-dimethoxy-pyridin-4-yl)-3-hydroxy-pentanoic acid tert-butyl ester (6) (3.6 g; 11.56 mmol) and potassium iodide (8 g) in acetic acid (10 mL) was stirred at 60° C. for 16 hours. Reaction was checked by TLC and was not completed. The mixture was then heated at 73° C. for 2 days. The acetic acid was removed by evaporation under reduced pressure and dichloromethane (50 mL) was added. The solution was then washed with saturated sodium bicarbonate solution, dried over sodium sulfate and concentrated under reduced pressure. Purification by column chromatograph over silica gel (10 to 50% ethyl acetate/hexanes) provided 1.9 g of the ester, 3-hydroxy-3-(3-methoxy-2-oxo-1,2-dihydro-pyridin-4-yl)-pentanoic acid tert-butyl ester (7), as a white solid.

1. customReaction
2. temperatureThe mixture was then heated at 73° C. for 2 days
3. customThe acetic acid was removed by evaporation under reduced pressure and dichloromethane (50 mL)
4. additionwas added
5. washThe solution was then washed with saturated sodium bicarbonate solution
6. dry with materialdried over sodium sulfate
7. concentrationconcentrated under reduced pressure
8. customPurification by column chromatograph over silica gel (10 to 50% ethyl acetate/hexanes)

ORD-Eintrag

ord-5009eba10bd14832836f58f81b715bab

Quelldatensatz

uspto-grants-2010_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07687487B2