Dimethyl Sulfoxide → HCID 59075101, compound

Temperature

-78 °C

A solution of dimethylsulfoxide (0.93 mL, 12 mmol) in dichloromethane (40 mL) was cooled to −78° C. under nitrogen, and a solution of oxalyl chloride (0.820 mL, 9.4 mmol) in dichloromethane (3 mL) was added to it, over a 2 minute period. The reaction mixture was left stirring at −78° C. for 30 minutes. A solution of 7-((R)-5-hydroxymethyl-3,3-dimethyl-2-oxo-pyrrolidin-1-yl)-heptanoic acid ethyl ester (2.25 g, 7.5 mmol) in dichloromethane (20 mL) was added slowly. When the addition was complete, the reaction flask was stirred for 15 minutes at −78° C. Finally, triethylamine (2.1 mL, 15.0 mmol) was added slowly to the reaction flask; it was left to reach room temperature and stirred for an additional 15 minutes. It was then quenched by adding 20 mL of water and 20 mL of diethyl ether, and extracted with dichloromethane. The organic phase was dried over potassium carbonate and concentrated to dryness. The crude mixture was purified by chromatography on silica gel using hexane:ethyl acetate 2:1 as a solvent giving 1.5 g of 7-((R)-5-formyl-3,3-dimethyl-2-oxo-pyrrolidin-1-yl)-heptanoic acid ethyl ester.

1. waitThe reaction mixture was left
2. additionWhen the addition
3. stirringthe reaction flask was stirred for 15 minutes at −78° C
4. waitit was left
5. customto reach room temperature
6. stirringstirred for an additional 15 minutes
7. customIt was then quenched
8. additionby adding 20 mL of water and 20 mL of diethyl ether
9. extractionextracted with dichloromethane
10. dry with materialThe organic phase was dried over potassium carbonate
11. concentrationconcentrated to dryness
12. customThe crude mixture was purified by chromatography on silica gel

ORD record

ord-8187b7ab6a3d4dd78d22830d299e27b8

Source dataset

uspto-grants-2005_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06900336B2