申请人:BASF Aktiengesellschaft
公开号:US05011927A1
公开(公告)日:1991-04-30
A process for the preparation of 2-amino-4-fluoropyrimidine derivatives of the general formula I ##STR1## (R.sup.1 hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, phenyl or benzyl, it being possible for the aromatic rings to be substituted, and R.sup.2 one of the R.sup.1 radicals with the exception of hydrogen) by reaction of 2,4,6-trifluoropyrimidine in an aprotic polar organic solvent with an amine of the formula III to give the 2-aminodifluoropyrimidine derivative IVa mixed with the 4-aminodifluoropyrimidine derivative IVb, separation of IVa out of the resulting reaction mixture and subsequent reaction of IVa with an alcohol in the presence of a base at from 0.degree. to 180.degree. C. to give the 2-amino-4-fluoropyrimidine derivative I, by carrying out the reaction of 2,4,6,-trifluoropyrimidine II with the amine III at from -80.degree. C. to -15.degree. C., and reacting the 2-aminodifluoropyrimidine derivative IVa with the alcohol in the presence of an organic base to give the 2-amino-4-fluoropyrimidine derivative I.
本发明涉及一种制备一般式I的2-氨基-4-氟嘧啶衍生物的方法,其中:##STR1##(其中R1为氢、烷基、烯基、炔基、环烷基、苯基或苄基,芳香环可以被取代,R2为除氢外的R1基团之一),通过在无水极性有机溶剂中将2,4,6-三氟嘧啶与公式III的胺反应,得到2-氨基二氟嘧啶衍生物IVa和4-氨基二氟嘧啶衍生物IVb的混合物,从所得反应混合物中分离出IVa,然后在0℃至180℃下,通过在碱的存在下将IVa与醇反应,制备2-氨基-4-氟嘧啶衍生物I。通过在-80℃至-15℃下将2,4,6-三氟嘧啶II与胺III反应,并在有机碱的存在下将2-氨基二氟嘧啶衍生物IVa与醇反应,制备2-氨基-4-氟嘧啶衍生物I。