Dimethyl Sulfoxide → tert-Butyl 4-formylpiperidine-1-carboxylate

Temperatur

-78 °C

Dimethyl sulfoxide (3.5 mL, 48.7 mmol) was dissolved in dichloromethane (100 mL) and was cooled to −78° C. Oxalyl chloride (3.65 mL, 41.8 mmol) was added. The mixture stirred for 30 min. To this solution was added a solution of 1-Boc-piperidine-4-methanol (7.5 g, 34.8 mmol) in dichloromethane (15 mL), and the mixture stirred for 1 h. Triethylamine (9.7 mL, 69.6 mmol) was added slowly and the mixture stirred at −78° C. for 30 min and warmed to room temperature over the course of 1 h. The mixture was diluted with water and the layers separated. The water layer was extracted with dichloromethane and the organic layers combined, dried (Na2SO4), filtered and concentrated to provide 1-Boc-piperidine-4-carboxaldehyde (6.75 g, 91%) as a yellow oil.

1. stirringthe mixture stirred for 1 h
2. stirringthe mixture stirred at −78° C. for 30 min
3. temperaturewarmed to room temperature over the course of 1 h
4. customthe layers separated
5. extractionThe water layer was extracted with dichloromethane
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated

ORD-Eintrag

ord-1da033014a0241498a4e97b2f2c16301

Quelldatensatz

uspto-grants-2005_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06855715B1