Process for purifying sterically hindered 4-amino piperidines

C - Chemistry – Metallurgy – 07 – D

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C07D 211/58 (2006.01) C07D 211/56 (2006.01) C07D 221/20 (2006.01)

Patent

CA 2257095

A process for purifying raw piperidines of formula (I), where R1 to R4 are C1 to C6 alkyl, R1 and R2 and/or R3 and R4 together are a CH2 chain with 2 to 5 C atoms. Said process is characterized in that in an initial step high-boiling-point substances and possible water are eliminated by distillation from the raw piperidines, in a second step 0.01 to 5 wt %, in relation to the product of the first step, of a reducing agent are added and in a third step the piperidines are isolated by distillation.

L'invention concerne un procédé de purification de 4-aminopipéridines brutes, de formule (I), dans laquelle R<1> à R<4> représentent alkyle C1-C6, R<1> et R<2> et/ou R<3> et R<4> représentent conjointement une chaîne CH2 avec 2 à 5 atomes de carbone. Ledit procédé est caractérisé en ce que, lors d'une première étape, on sépare par distillation les substances à point d'ébullition élevé et éventuellement l'eau, contenues dans les pipéridines brutes. Lors d'une deuxième étape, on ajoute 0,01 à 5 % en poids d'un agent de réduction, par rapport au produit de la première étape, et, lors d'une troisième étape, on isole les pipéridines par distillation.

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