SYNTHESIS OF 5H-DIPYRIDOPYRIMIDIN-5-ONE AND 5-H-PYRIDOPYRIMIDOQUINAZOLIN-5-ONES
α-Amino-N-heteroarenes on cyclocondensation with 2-chloropyridine-3-carboxylic acid chloride afford the title compounds 4 and 7.Although compound 4 is obtained in one-pot while compound 7 is formed via its amide intermediate 6.