Process for the preparation of...

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C - Chemistry, Metallurgy

07

D

C07D 491/052 (2006.01) C07D 491/04 (2006.01)

Patent

CA 2375860

A process for the preparation of the esters of 1,8-disubstituted -1,3,4,9- tetrahydropyrano (3,4-b)-indole-1-acetic acid reacting 7-alkyltryptophol of Formula (II): with a .beta.-ketoester of formula (III), in a hydroxylic solvent, comprising at least one alkanol solvent having 1-4 carbon atoms, containing hydrogen chloride gas, and subsequently recovering the product of Formula (I) is delineated.

L'invention concerne un procédé de préparation des esters acétiques 1,8 disubstitués de 1,3,4,9-tétrahydropyrano (3,4-b)-indole-1, qui consiste d'une part à faire réagir 7-alkyltryptophol de formule (II), avec un .beta.-céto-ester de formule (III), dans un solvant hydroxylique qui comprend au moins un solvant alcanol possédant 1 à 4 atomes de carbone, et qui contient de l'acide chloridrique gazeux, et d'autre part, à récupérer le produit de formule (I).

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