[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF 2-AMINO-5,8-DIMETHOXY[1,2,4]TRIAZOLO[1,5-C]PYRIMIDINE FROM 4-AMINO-2,5-DIMETHOXYPYRIMIDINE<br/>[FR] PROCÉDÉ AMÉLIORÉ POUR LA PRÉPARATION DE 2-AMINO-5,8-DIMÉTHOXY[1,2,4]TRIAZOLO[1,5-C]PYRIMIDINE À PARTIR DE 4-AMINO-2,5-DIMÉTHOXYPYRIMIDINE
申请人:DOW AGROSCIENCES LLC
公开号:WO2014043148A1
公开(公告)日:2014-03-20
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.