Process for the preparation of dioxane acetic acid esters

C - Chemistry – Metallurgy – 07 – D

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C07D 319/06 (2006.01)

Patent

CA 2490205

Process for the preparation of an ester of formula (1), wherein R1represents a leaving group, CN, OH or a COOR5 group, R3 and R4each independently represent a 1-3 C alkyl group, and R2 and R5 each independently represent an ester residue, wherein the corresponding salt with formula (2), wherein M represents H or an alkali (earth) metal in an inert solvent is contacted with an acid chloride forming agent to form the corresponding acid chloride, and the acid chloride is contacted with an alcohol with formula R2OH in the presence of N- methyl-morpholine. Preferably M represents an alkali metal, and R2 represents an alkyl group, particularly a t.-butyl group. (1), (2)

L'invention concerne un procédé de préparation d'un ester de formule (1) dans laquelle : R?1¿ représente un groupe partant, CN, OH, ou un groupe COOR?5 ¿; R?3¿ et R?4¿ représentent indépendamment l'un de l'autre un groupe alkyle C1-3 ; et R?2¿ et R?5¿ représentent indépendamment l'un de l'autre un résidu ester. Ce procédé consiste à mettre le sel correspondant de formule (2), dans laquelle M représente H ou un métal alcalin(o-terreux) dans un solvant inerte, en contact avec un agent de formation de chlorure d'acide pour former le chlorure d'acide correspondant, et à mettre ce chlorure d'acide en contact avec un alcool de formule R?2¿OH, en présence de N-méthyle morpholine. De préférence, M représente un métal alcalin et R?2¿ représente un groupe alkyle, en particulier un groupe t-butyle.

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