Dimethyl Sulfoxide → 2-(3,6-dihydro-2H-pyran-4-yl)-2-methyl-propionaldehyde

Temperature

-78 °C

Step D To a solution of oxalyl chloride (2.84 mL, 33 mmol) (Aldrich) in dichloromethane (150 mL) at −78° C. was added the solution of dimethyl sulfoxide (4.6 mL, 65 mmol) in dichloromethane (25 mL) dropwise. After 5 mins, the solution of 2-(3,6-dihydro-2H-pyran-4-yl)-2-methyl-propan-1-ol (4.6 g, 29 mmol) in dichloromethane (25 mL) was added dropwise. The reaction mixture was stirred at −78° C. for 15 min. Triethylamine (14.8 mL, 110 mmol) was added and the reaction mixture was slowly warmed up to room temperature and stirred at room temperature for 45 min. Then water was added. The organic layers were separated, and the aqueous layer was extracted with dichloromethane. The organic layers were combined, washed with 10% of HCl, saturated NaHCO3, brine, dried over MgSO4, and concentrated to give 2-(3,6-dihydro-2H-pyran-4-yl)-2-methyl-propionaldehyde as a brown oil (Yield: 5.6 g, 89%).

1. temperaturethe reaction mixture was slowly warmed up to room temperature
2. stirringstirred at room temperature for 45 min
3. customThe organic layers were separated
4. extractionthe aqueous layer was extracted with dichloromethane
5. washwashed with 10% of HCl, saturated NaHCO3, brine
6. dry with materialdried over MgSO4
7. concentrationconcentrated

ORD record

ord-dbfa3c830fd5448bbd5e0ba7992f7c5b

Source dataset

uspto-grants-2013_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08354444B2