Reaktion #59062

Reaktionsgleichung

sodium cyanoborohydride

ethylpiperidine-4-carboxylate

acetone

acetic acid

→

ethyl-1-(methylethyl)piperidine-4-carboxylate

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   EinengenThe mixture was then concentrated and to it
2. 2
   workup.ADDITIONwas added sodium bicarbonate
3. 3
   Sonstigewas partitioned between ethyl acetate and water
4. 4
   TrocknenThe organic layer was dried with sodium sulfate
5. 5
   Einengenconcentrated

Vorschrift

To ethylpiperidine-4-carboxylate (1 eq) in methanol was added acetone (1 eq) and acetic acid (5%) and the resulting mixture was stirred for 2 h at ambient temperature. To it was then added sodium cyanoborohydride (1 eq) and continued stirring for 16 h. The mixture was then concentrated and to it was added sodium bicarbonate and was partitioned between ethyl acetate and water. The organic layer was dried with sodium sulfate and concentrated to yield ethyl-1-(methylethyl)piperidine-4-carboxylate. To this was then added concentrated hydrochloric acid and water (2:1) and the mixture was refluxed for 5 h. The resulting 1-(methylethyl)piperidine-4-carboxylic acid was then azeotroped with toluene. MS: MH+=172.

Quelle