Abstract The reaction of several substituted 2-aminopyridines with diethyl malonate was studied. The “methylmalonyl-α-aminopyridines” were shown to exist in the same tautomeric form as “malonyl-α-aminopyridine”. Formylation of these compounds takes place in the 3- position and has led to the formation of a new tricyclic compound.
![2-Chloro-4H-pyrido[1,2-a]pyrimidin-4-one Structure](https://image.chemsrc.com/caspic/489/5418-94-0.png)
![8-morpholin-4-yl-1,7-diazabicyclo[4.4.0]deca-2,4,6,8-tetraen-10-one Structure](https://image.chemsrc.com/caspic/128/17326-31-7.png)