In this thesis 4-oxo-4H-pyrido[1,2-a]pyrimidin-3-diazonium tetrafluoroborate, a useful intermediate in the synthesis of heterocycles and bioconjugation, was synthesized in five steps from hippuric acid. The final product and all intermediates were characterized by IR and 1H NMR spectroscopy; four out of five compounds were also characterized by elemental analysis for C, H, and N. I also found out that 3-amino-4-oxo-4H-pyrido[1,2-a]pyrimidine precipitated from the solution as a dihydrochloride salt.
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