Reaction of 3‐Dimethylamino‐2,2‐dimethyl‐2H‐azirine with Barbituric AcidThe reaction of 3‐dimethylamino‐2,2‐dimethyl‐2H‐azirine(1)with barbituric acid(4)in dimethyl formamide at room temperature yields a mixture of several compounds. The two main products5and6have been isolated in 40 and 10% yield, respectively, and their structures established by X‐ray analysis. InSchemes 4–6reaction mechanisms for the formation of5and6are postulated, the first step beeing either aC‐ or anN‐alkylation of barbituric acid.Reduction of5and6with NaBH4in ethanol at room temperature yields 6,6‐dimethyl‐1,5,6,7‐tetrahydro‐pyrrolo[2,3‐d]pyrimidin‐2,4(3H)‐dione(7)and 3,3‐dimethyl‐2,3‐dihydro‐imidazo[1,2‐c]pyrimidin‐5,7(1H, 6H)‐dione(8)in 38 and 48% yield, respectively. Treatment of6with 3Naqueous NaOH at room temperature gives 3,3‐dimethyl‐imidazo[1,2‐c]