Ethanol → Ethyl 4-[amino(hydroxyimino)methyl]-1-piperidinecarboxylate

Participants

Reaction Conditions

Reaction Steps

Ethanol (150 ml) was added to a solution of hydroxylamine hydrochloride (17.25 g) in water (48 ml). Ethyl 4-cyano-1-piperidinecarboxylate (45 g) was added and the mixture was cooled. Sodium methoxide (44.4 g) was added dropwise at RT and the reaction mixture was stirred for 30 minutes at 60° C. The reaction mixture was cooled, filtered and the filtrate evaporated. The residue was purified by column chromatography on silica gel (eluent: CH2Cl2 /CH3OH 95/5). The pure fractions were collected and the solvent evaporated, yielding 25 g (40%) of ethyl 4-[amino(hydroxyimino)methyl]-1-piperidinecarboxylate. This fraction was redissolved in 2-propanone and converted into the hydrochloric acid salt (1:1) with HCl/2-propanol. The precipitate was filtered off and dried, yielding 22 g (35%) of ethyl 4-[amino(hydroxyimino)methyl]-1-piperidine-carboxylate hydrochloride (intermediate 2).

Provenance & Evidence