Explosion-proof...

C - Chemistry – Metallurgy – 07 – C

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260/251, 260/268

C07C 251/30 (2006.01) C07D 213/53 (2006.01) C07D 239/24 (2006.01)

Patent

CA 2005330

- ? - Abstract: Preparation of explosion-proof trimethine salts of slight solubility in water which have the formula I Image (I) in which R is aryl or heteroaryl which is unsubstituted or mono- or polysubstituted and X is the anion equivalent of a non-oxidizing acid radical which is inert towards the trimethine cation and can form trimethine salts of slight solubility in water, by formylation of compounds of the formula II R-CH2-COOH (II) in which R is as defined in formula I under the condi- tions of the Vilsmeier-Haack reaction, followed by hydrolysis of the formylation product in aqueous medium with the formation of water-soluble primary trimethine salts and reaction of the water-soluble primary tri- methine salts in the aqueous reaction mixture with acids of the formula III (H)nX (III) in which X is as defined in formula I and n is a number from 1 to 3, or water-soluble salts thereof in at least stoichiometric amounts and separating off the resulting trimethine salts of slight solubility in water which have the formula I. Trimethine salts of the formula I are used as inter- mediates for the synthesis of heterocycles, preferably of pyrimidines and pyridines.

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