Glycolic Acid → 2-(2-Hydroxy-acetyl)-hexahydro-cyclopenta[c]pyrrol-5-one

Temperatur

25 °C

Hexahydro-cyclopenta[c]pyrrol-5-one triflutate 1f (764.8 mg, 3.2 mmol) and 2-hydroxyacetic acid (267.5 mg, 3.52 mmol) were dissolved in 10 mL of acetonitrile, and hydroxyacetic acid (1.3 g, 9.6 mmol), 1-ethyl-3-dimethylaminopropyl-carbodiimide hydrochloride (1.23 g, 6.4 mmol) and triethylamine (1.3 mL, 9.6 mmol) were then added to the solution in an ice-water bath. The ice-water bath was then removed, and the reaction mixture was stirred overnight at 25° C. The solvent was evaporated, and 20 mL of ethyl acetate was then added to the residue. The mixture was filtered and the filtrate was washed with 20 mL of water. The combined organic extracts were dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to obtain the title compound 2-(2-hydroxy-acetyl)-hexahydro-cyclopenta[c]pyrrol-5-one 3a (0.375 g, yield 64%) as a colorless oil.

1. customThe ice-water bath was then removed
2. customThe solvent was evaporated
3. addition20 mL of ethyl acetate was then added to the residue
4. filtrationThe mixture was filtered
5. washthe filtrate was washed with 20 mL of water
6. dry with materialThe combined organic extracts were dried over anhydrous magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customThe residue was purified by silica gel column chromatography

ORD-Eintrag

ord-4406091749924f2e9255f44ca3709db9

Quelldatensatz

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08178575B2