Process for the production of purine derivatives and...

C - Chemistry – Metallurgy – 07 – D

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C07D 473/00 (2006.01) C07D 319/06 (2006.01)

Patent

CA 2322583

A process for the production of a compound of formula (I), wherein X is H, OH or halo; and R1 and R2 are selected independently from C1-12 alkyl, aryl, C1- 12 alkylaryl, C1-12 alkylsilyl arylsilyl and C1-12 alkylarylsilyl, or R1 and R2 are joined together to form a cyclic acetal or ketal; which method comprises reacting a compound of formula (II) with a compound of formula (III), wherein Y is a leaving group in the presence of a palladium(0) catalyst and a ligant. The process provides a novel method of the production of famciclovir and penciclovir.

Procédé servant à préparer un composé représenté par la formule (I), dans laquelle X représente H, OH ou halo; R¿1? et R¿2? sont sélectionnés indépendamment dans alkyle C¿1?-C¿12?, aryle, alkylaryle C¿1?-C¿12?, alkylsilyle C¿1?-C¿12?, arylsilyle et alkylarylsilyle C¿1?-C¿12?, ou R¿1? et R¿2? sont réunis afin de former un cétal ou un acétal cyclique. Ce procédé consiste à effectuer la réaction d'un composé représenté par la formule (II) avec un composé représenté par la formule (III) dans laquelle Y représente un groupe partant en présence d'un catalyseur de palladium (0) et d'un ligand. Ce procédé permet de préparer famciclovir et penciclovir de façon innovatrice.

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