Hydrochloric Acid → N-methoxy-N-methyl-2-oxopiperidine-4-carboxamide

To a stirred solution of 2-oxopiperidine-4-carboxylic acid (CAS #24537-50-6) (1.4 g, 9.78 mmol) in DCM (20 ml) was added portion wise CDI (1.665 g, 10.27 mmol). The suspension was stirred at room temperature for 5 hrs and N,O-dimethylhydroxylamine (1.002 g, 10.27 mmol) was added to the suspension and the reaction mixture was stirred overnight at room temperature. HCl (4M) in 1,4-dioxane (2.445 ml, 9.78 mmol) was added to the cloudy brown-orange solution and the reaction was stirred for 30 min (pH 7). The white precipitate was filtered off and the filtrate was washed with aqueous NaHCO3 solution. The organic phase was dried over Na2SO4, filtered and concentrated in vacuo to obtain the title compound as brown liquid.

1. stirringthe reaction mixture was stirred overnight at room temperature
2. stirringthe reaction was stirred for 30 min (pH 7)
3. filtrationThe white precipitate was filtered off
4. washthe filtrate was washed with aqueous NaHCO3 solution
5. dry with materialThe organic phase was dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo

ORD-Eintrag

ord-e91d84a9492f45df90da9a2496b8bc82

Quelldatensatz

uspto-grants-2014_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08859535B2