Abstract Alkylation of 2-hydroxy-4H-pyrido [1, 2-a] pyrimidin-4-one (1) was investigated under solid–liquid phase transfer catalysis conditions (PTC), using tetrabutylammonium bromide and potassium carbonate. The reaction with alkyl halides led to the formation of various 2-alkoxy products, in fair yields. Reaction of compound 1 with epichlorohydrin and chloroacetonitrile, under the same PTC conditions, afforded novel O1, O3-disubstituted ...