The Chemistry of 5-Oxodihydroisoxazoles. III. Synthesis of Further Annelated Pyrimidines

Abstract

The synthesis of some 2-heterocyclyl-5-oxo-2,5-dihydroisoxazole-4-carboxylates is reported, where the heterocycle is pyridin-2-yl, triazin-2-yl, pyrimidin-4-yl, quinolin-2-yl or phthalazin- 1-yl, as is their base-catalysed rearrangement to the corresponding annelated pyrimidines.