Dimethyl Sulfoxide → 5-(3-Pyridinyl)-2-pentanone

Temperature

-60 °C

(according to J. W. Tilley, P. Levitan, J. Lind, A. F. Welton, H. J. Crowley, L. D. Tobias, M. O'Donnell J. Med. Chem. 1987, 30, 185-93; Swern oxidation of the alcohol) 59.5 ml of oxalyl chloride in 1.4 l of absolute dichloromethane are cooled to −60° C. and 96 ml of absolute DMSO (dissolved in 280 ml of absolute dichloromethane) are slowly added dropwise. After 15 minutes' stirring at −60° C., 93 g of 5-(3-pyridyl)-2-pentanol in 470 ml of the same solvent are added dropwise at ˜60° C. After 20 minutes' stirring, 396 ml of triethylamine are slowly added, the mixture stirred for a further 20 minutes at −60° C. and allowed to rise to room temperature. The reaction solution is finally poured into 700 ml of iced water, which has previously been combined with NaOH pellets. Once the phases have separated, the aqueous, alkaline phase is extracted 3 times with 300 ml portions of dichloromethane, the combined organic phases are washed 4 times with 500 ml portions of water, dried over potassium carbonate and evaporated. After distillation, 5a of b.p. 98-104° C., 3·101 Pa (0.2 Torr) is obtained in good yield.

1. stirringAfter 20 minutes' stirring
2. stirringthe mixture stirred for a further 20 minutes at −60° C.
3. customto rise to room temperature
4. customOnce the phases have separated
5. extractionthe aqueous, alkaline phase is extracted 3 times with 300 ml portions of dichloromethane
6. washthe combined organic phases are washed 4 times with 500 ml portions of water
7. dry with materialdried over potassium carbonate
8. customevaporated
9. distillationAfter distillation, 5a of b.p. 98-104° C., 3·101 Pa (0.2 Torr)
10. customis obtained in good yield

ORD record

ord-817b49b90a2c422b828a1d9265affd4e

Source dataset

uspto-grants-2003_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06534489B1