Several 2-and 5-substituted oxazolo [5, 4-d] pyrimidines have been prepared from 5-amino- 4-cyanooxazole derivatives via N-ethoxymethylene intermediates in order to compare them with purine derivatives. Spectroscopic data and some chemical properties of these compounds were examined. A convenient method for the preparation of a starting material was described.
![Oxazolo[5,4-d]pyrimidin-7-amine,2-ethyl- Structure](https://image.chemsrc.com/caspic/173/25680-40-4.png)
![Oxazolo[5,4-d]pyrimidin-7-amine,2-methyl- Structure](https://image.chemsrc.com/caspic/114/25680-37-9.png)
