Method for producing carbonyl diimidazoles

Details Method for producing carbonyl diimidazoles Method for producing carbonyl diimidazoles

C - Chemistry, Metallurgy

07

D

C07D 233/61 (2006.01)

Patent

CA 2336657

The invention relates to a method for producing carbonyl diimidazoles of general formulas (Ia), (Ib), (Ic) or mixtures thereof, whereby R1 represents hydrogen or a C1-C4 alkyl radical and R2 represents hydrogen or a methyl radical. According to the invention, stoichiometric quantities of an organic nitrogenous base which comprises a lower pK b value than imidazole is added to the reaction mixture with regard to the imidazoles by reacting at least one imidazole of general formulas (IIa) and (IIb) in which R1 and R2 have the aforementioned meanings with phosgene in an inert solvent.

L'invention concerne un procédé permettant de préparer des diimidazoles de carbonyle des formules générales (Ia), (Ib), (Ic) ou leurs mélanges. Dans ces formules, R<1> désigne hydrogène ou un reste alkyle C1-C4 et R<2> désigne hydrogène ou un reste méthyle. Selon ce procédé, on ajoute des quantités stoechiométriques de base d'azote organique dont la valeur pkb est inférieure à celle de l'imidazole, au mélange réactionnel, par rapport aux imidazoles, par réaction d'au moins un imidazole des formules générales (IIa) et (IIb), dans lesquelles R<1> et R<2> ont la signification mentionnée c-dessus, avec du phosgène dans un solvant inerte.

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