SEARCH Articles Figures Tables 2- -477-pyrido Vilsmeier-Haack formylation 3- -4//-pyrido pyrimidine 3- pyrimidin-4-one 3-Formyl-2- pyrimidin-4-one Formylations, Vilsmeier-Haack Haack Haack Formylation Pyrido 4-ones Pyrimidine-4 -ones Vilsmeier Vilsmeier formylation Vilsmeier-Haack Vilsmeier-Haack formylation