SEARCH Articles Figures Tables 3- -4/7-pyrido pyrimidines, alkylation Alkyl 3-aminothiophene-4-carboxylates pyrimidines Alkyl halide with pyrimidines Pyrazolo pyrimidines alkylation Pyrimidines radical alkylation Pyrimidines, alkyl-, reactivity Pyrimidines, alkyl-, reactivity basicity Pyrimidines, alkyl-, reactivity nucleophilic substitution Substituted alkyl pyrimidine amines Thieno pyrimidin-2 -thione alkylation Thieno pyrimidin-4 -ones alkylation Thieno pyrimidine-4 -thione alkylation