Sulfuryl chloride → Ethyl 2-chloro-4-methyl-3-oxopentanoate

A 1M solution of sulfuryl chloride in dichloromethane (25 mL, 25 mmol) was added to a solution of 4-methyl-3-oxopentanoic acid ethyl ester (3.95 g, 25 mmol) in dichloromethane (15 mL) cooled in a water bath. The solution was stirred at room temperature for 2 h and then the reaction mixture was washed with water (2×20 mL). Each of the aqueous layers was extracted with dichloromethane and the combined organic layers were dried (MgSO4), filtered and evaporated to give 2-chloro-4-methyl-3-oxopentanoic acid ethyl ester (5.0 g, 104% of the theoretical amount). This was used directly in the next step without purification.

1. temperaturecooled in a water bath
2. washthe reaction mixture was washed with water (2×20 mL)
3. extractionEach of the aqueous layers was extracted with dichloromethane
4. dry with materialthe combined organic layers were dried (MgSO4)
5. filtrationfiltered
6. customevaporated

ORD record

ord-215555ff93dd4586b87f7ee813feddad

Source dataset

uspto-grants-2003_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06515124B2