Method for producing 4,6-disubstituted 2-isocyanatopyrimidines and to their use as intermediate products for active ingredient syntheses

摘要

Isocyanates of the formula (I)in which X and Y are defined as in formula (I) of claim 1 can be prepared by reacting a compound of the formula (II) or its saltsin which X and Y are defined as in formula (I),with 1 to 6 mol of phosgene per mole of compound of the formula (II), in the presence of 2 to 3.5 molar equivalents of a base per mole of compound of the formula (II) and in the presence of an aprotic organic solvent at a reaction temperature in the range from -30 to +60° C. to give the compound of the formula (I). The compounds (I) can be converted by reaction with nucleophiles to give addition products, such as carbamates, ureas and sulfonylureas and corresponding products, e.g. herbicidal sulfonylureas.