Preparation of tris-substituted...

C - Chemistry – Metallurgy – 07 – D

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C07D 251/70 (2006.01)

Patent

CA 2349173

The present invention relates to a method for preparing tris-substituted alkoxycarbonylamino-1,3,5-triazine compounds, which involves reacting an amino- 1,3,5-triazine compound such as melamine, for example, in the presence of excess amounts of carbon monoxide and an alcohol, a sub-stoichoimetric amount of a base, a catalyst system that includes a catalytic amount of a primary catalyst of a group VIII metal or metal salt, and a sub-stoichiometric amount of a co-catalyst of a group I-B or lanthanide series metal or metal salt. The reaction is conducted at a temperature, pressure and length of time sufficient to form a tris-substituted alkoxycarbonylamino-1,3,5-triazine compound in a yield of at least about 5 percent, with improved yields of more than 40 percent being conveniently obtained.

L'invention porte sur un procédé de préparation de composés d'alkoxycarbonylamino-1,3,5-triazine tris-substitués consistant à faire réagir un composé amino-1,3,5-triazine tel que par exemple la mélamine, en présence d'un excès de CO et d'un alcool, d'une quantité sub-stoechoimetrique d'une base, d'un système catalytique comprenant une quantité à effet catalytique d'un catalyseur primaire d'un métal du groupe VIII ou l'un de ses sels, et d'une quantité sub-stoechoimetrique d'un cocatalyseur d'un métal du groupe I-B ou d'un lanthanide ou l'un de leurs sels. La réaction s'effectue à une température, une pression et pendant une durée, suffisantes pour former le composé d'alkoxycarbonylamino-1,3,5-triazine tris-substituté avec un rendement d'environ 5 % au moins, pouvant être facilement porté jusqu'à 40 %.

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