AN IMPROVED PROCESS FOR THE PREPARATION OF 2-AMINO-5,8-DIMETHOXY 1,2,4TRIAZOLO1,5-CPYRIMIDINE FROM 4-AMINO-2,5-DIMETHOXYPYRIMID INE.

摘要

5-Substituted-8-alkoxy[l,2,4]triazolo[l,5-c]pyrimidin-2-amines are manufactured from 4-amino-2,5-dialkoxypyrimidines in an improved process in which the generation of gaseous by-products is controlled by the continuous addition of hydroxylamine as a free base.