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A novel method was successfully demonstrated towards the synthesis of pyrido[1,2-a]pyrimidines having chloroethyl as an intractable side chain, through dihydrofuranone intermediates. The dihydrofuranone intermediates were synthesized by condensation of 2-aminopyridines with α -acetyl- γ -butyrolactone, which upon cyclization using phosphorus  oxychloride or ethanol in sodium ethoxide furnished the pyrido[1,2-a]pyrimidines in good yield.

New Approach for the Synthesis of Pyrido[1,2-a]pyrimidines