申请人:BASF Aktiengesellschaft
公开号:US05739328A1
公开(公告)日:1998-04-14
A process for preparing asymmetrically substituted triazines of the formula I ##STR1## where R.sup.1 is hydrogen, methyl or ethyl, R.sup.2 and R.sup.3 independently of one another are an unsubstituted or substituted hydrocarbon radical, by reaction of a cyanoguanidine of the formula II ##STR2## with a carboxylic acid derivative in the presence of an alcohol of the formula III R.sup.2 --OH III, which comprises reacting a carboxylic acid ester of the formula IV R.sup.3 --COOR.sup.4 IV, where R.sup.3 has the abovementioned meaning and R.sup.4 is an unsubstituted or substituted hydrocarbon radical, in the presence of a base or of a carboxamide selected from the group consisting of N,N-dialkylformamide, N,N-dialkylacetamide and N-methylpyrrolidone and in the presence of a salt or of a salt-like compound of the elements magnesium, calcium, aluminum, zinc, copper, iron, cobalt, nickel or chromium, is described.
一种制备式I的不对称取代三嗪的方法:其中R1是氢、甲基或乙基,R2和R3是未取代或取代的碳氢基团,通过在醇III的存在下,将式II的氰基脲与羧酸衍生物反应,其中醇III的结构为R2-OH III。该方法包括在碱或从N,N-二烷基甲酰胺、N,N-二烷基乙酰胺和N-甲基吡咯烷酮中选择的羧酸酯IV的存在下,在镁、钙、铝、锌、铜、铁、钴、镍或铬的盐或类盐化合物的存在下,反应式IV其中R3具有上述含义,R4是未取代或取代的碳氢基团。