ABSTRACT
2-Amino-5-alkoxycarbonylfurans 1a–c react with 1-chloro-2,2,2-trihalogenoethyliden-O-methylurethanes 2a,b at room temperature to give N-(2-furyl)-N′-methoxycarbonyl-trihalogenoacetamidines 3a–f which cyclize into 2-trihalogenomethyl-3,4-dihydrofuro[2,3-d]pyrimidin-4-ones 4a–f on boiling in toluene.