Improved preparation of...

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 211/78 (2006.01) C07D 405/12 (2006.01)

Patent

CA 2212449

A process is provided for the preparation of 1,2,5,6-tetrahydro-3- carboalkoxypyridines of formula (III) Image wherein R is a straight or cyclic substituted or unsubstituted alkyl chain having 1 to 6 carbon atoms, phenyl C1-6 alkyl, menthol or a derivative of menthol, or a derivative of camphor, and R' is an alkyl chain having 1 to 4 carbon atoms or phenyl C1-6 alkyl comprising reacting an alkyl pyridinium salt of formula (II) Image wherein R and R' are as defined above and X is a suitable leaving group with sodium triacetoxyborohydride in the presence of an acid.

Divulgation d'un procédé de préparation de 1,2,5,6-tétrahydro-3-carboalcoxypyridines de formule (III) Image , dans laquelle : R représente une chaîne linéaire ou cyclique substituée ou non substituée comportant de 1 à 6 atomes de carbone, un phényle substitué par un alkyle en C1-C6, un menthol ou un dérivé de menthol, ou un dérivé du camphre; R' représente un alkyle en C1-C4 ou un phényle substitué par un alkyle en C1-C6. Ce procédé comprend la réaction d'un sel d'alkylpyridinium de formule (II) Image , dans laquelle R et R' représentent les entités susmentionnées et X représente un groupement partant adéquat pouvant être éliminé à l'aide de triacétoxyborohydrure de sodium en présence d'un acide.

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