2-Methylcyclopentanone → HCID 63277975, compound

To a solution of 9.2 g (0.060 mole) of 3-amino-propanoic acid ethyl ester HCl salt and 5.9 g (0.060 mole) of (rac)-2-methyl-cyclopentanone in 300 mL of dichloromethane was added 10.8 g (0.132 mole) of sodium acetate and 19.1 g (0.090 sodium triacetoxyborohydride (19.1 g, 90 mmol). The mixture was stirred at ambient temperature overnight and then quenched by the addition of 100 mL of 10% sodium bicarbonate solution. The aqueous layer was extracted twice with 200 mL of dichloromethane, and the combined dichloromethane layers dried over anhydrous magnesium sulfate. The mixture was filtered, concentrated under reduced pressure, and distilled at 0.0015 mm Hg (bp 70 degrees), to give 9.8 g of (rac)-3-(2-methyl-cyclopentylamino)-propanoic acid ethyl ester.

1. customquenched by the addition of 100 mL of 10% sodium bicarbonate solution
2. extractionThe aqueous layer was extracted twice with 200 mL of dichloromethane
3. dry with materialthe combined dichloromethane layers dried over anhydrous magnesium sulfate
4. filtrationThe mixture was filtered
5. concentrationconcentrated under reduced pressure
6. distillationdistilled at 0.0015 mm Hg (bp 70 degrees)

ORD record

ord-299b91deba154749916a79c095e024c7

Source dataset

uspto-grants-2009_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07517873B2