Pyridine → Tert-butyl 2-cyanopiperidine-1-carboxylate

Temperatur

-5 °C

Acetonitrile (220 mL) and DMF (3.82 mL, 49.4 mmol) were added to a 500 mL round bottom flask equipped with stir bar. Cooled the mixture down to −5° C. and to it added oxalyl chloride (24.7 mL, 49.4 mmol, 2 M dichloromethane). The resulting mixture was stirred for 15 min. This was followed by addition of solution of 2-carbamoyl-piperidine-1-carboxylic acid tert-butyl ester (9.4 g, 41.2 mmol) in acetonitrile (50 mL) and pyridine (8.3 mL, 103 mmol). Reaction mixture was left stirring at room temperature overnight. The reaction mixture was concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL). The organic phase was successively washed with water (300 mL) and brine (200 mL), dried (sodium sulfate), filtered and concentrated in vacuo to isolate the title compound (8.44 g, 97%) as a yellow solid. 1H-NMR (CDCl3), δ(ppm): 5.23 (bs, 1H), 4.03 (bs, 1H), 2.93 (t, 1H), 1.75 (m, 5H), 1.46 (m, 10H).

1. customequipped
2. stirringThe resulting mixture was stirred for 15 min
3. customReaction mixture
4. waitwas left
5. stirringstirring at room temperature overnight
6. concentrationThe reaction mixture was concentrated in vacuo
7. dissolutionthe residue was dissolved in ethyl acetate (300 mL)
8. washThe organic phase was successively washed with water (300 mL) and brine (200 mL)
9. dry with materialdried (sodium sulfate)
10. filtrationfiltered
11. concentrationconcentrated in vacuo

ORD-Eintrag

ord-3edc9b2b8f3444c9ae70e7c1766ffe10

Quelldatensatz

uspto-grants-2006_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07074809B2