New process for the preparation of n-monosubstituted...

C - Chemistry – Metallurgy – 07 – D

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C07D 241/04 (2006.01) C07D 241/06 (2006.01) C07D 241/24 (2006.01) C07F 9/6509 (2006.01)

Patent

CA 2228896

A new process for the selective preparation of a compound of formula (I), wherein R1 is a straight, branched or cyclic C1-C20 alkyl group, or an arylalkyl wherein aryl is C6 aryl and alkyl is C2-C6 alkyl; R2 is defined as for R1, or is benzyl, hydroxy, or an aminoalkyl group wherein alkyl is a straight, branched or cyclic C1-C20 alkyl; Y is OH, a group OR1 wherein R1 is as defined above, or NR3R4 wherein R3 and R4 independently are hydrogen, C1- C20 alkyl, or aralkyl wherein aryl is C6 aryl and alkyl is C2-C6 alkyl, as well as products obtained by said process and intermediates for use in the process.

L'invention concerne un nouveau procédé permettant la préparation sélective d'un composé de formule (I) où R?1¿ est un groupe alkyle à chaîne droite, ramifiée ou cyclique, ou un arylalkyle où l'aryle est un C¿6?-aryle et l'alkyle un C¿2?-C¿6? alkyle; R?2¿ est défini de la même manière que R?1¿, ou est benzyle, hydroxy, ou un groupe aminoalkyle où l'alkyle est un C¿1?-C¿20? alkyle à chaîne droite, ramifiée ou cyclique; Y est OH, un groupe OR?1¿ tel que défini ci-dessus, ou NR?3¿R?4¿ où R?3¿ et R?4¿ sont indépendamment l'un de l'autre l'hydrogène, C¿1?-C¿20? alkyle, ou aralkyle où l'aryle est un C¿6?-aryle et l'alkyle un C¿2?-C¿6? alkyle. Elle concerne également les produits obtenus par ledit procédé et les intermédiaires utilisés au cours du procédé.

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