A new route to 7-deazaguanine derivatives

The Synthesis of 2-amino-4,6-dichloro-5-(2,2-diethoxyethyl) pyrimidine $\text{7}$ has been performed in four steps starting from guanidine and diethylallylmalonate. $\text{7}$ is a new key intermediate for the synthesis of 7-alkyl-2-amino-3,4-dihydro-7H-pyrrolo 2,3-d] pyrimidin-4-ones.