Method for producing cyclic lactams

C - Chemistry – Metallurgy – 07 – D

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C07D 201/08 (2006.01) C07D 201/16 (2006.01)

Patent

CA 2407812

The invention relates to a method for producing cyclic lactams of formula (II) by reacting a compound (I) of formula (I) with water in the presence of an organic, liquid dilution agent in the liquid phase. In formula (II), n and m respectively can have the values 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 and the sum of n + m is at least 3, preferably at least 4 and R1 and R2 represent C1-C6 alkyl, C5-C7 cycloalkyl or C6-C12 aryl groups. In formula (I), R1, R2, m and n are defined as above and R represents nitrile, carboxylic acid amide and carboxylic acid groups. The inventive method is characterized in that a) compound (I) is reacted with water in the liquid phase in the presence of an organic, liquid dilution agent (III) to form a mixture (IV) containing a lactam (II) and said mixture (IV) is subjected to an aqueous treatment to obtain a two-phase system.

L'invention concerne un procédé pour la production de lactames cycliques de formule (II) par réaction d'un composé de formule (I) avec de l'eau, en présence d'un diluant liquide organique en phase liquide. Dans la formule (II), n et m peuvent chacun valoir 0, 1, 2, 3, 4, 5, 6, 7, 8 et 9 et la somme de n + m vaut au moins 3, de préférence au moins 4, et R?1¿ et R?2¿ représentent des groupes alkyle C¿1?-C¿6?, cycloalkyle C¿5?-C¿7? ou aryle C¿6?-C¿12?. Dans la formule (I), R?1¿, R?2¿, m et n ont la signification précédente et R représente des groupes nitrile, amide d'acide carboxylique et acide carboxylique. Le procédé selon l'invention est caractérisé a) en ce qu'on fait réagir le composé (I) avec de l'eau en phase liquide en présence d'un diluant liquide organique (III) afin d'obtenir un mélange (IV) contenant un lactame (II) et en ce qu'on soumet ce mélange (IV) à un traitement aqueux l'eau avec obtention d'un système à deux phases.

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