Abstract
Abstract1,3‐Dimethyluracil (1), a versatile synthon for the synthesis of various heterocycles, reacted readily with 3‐aminopyrazoles 2 in sodium ethoxide to give pyrazolo[1,5‐a]pyrimidines 3. Under similar conditions, 3‐aminopyrazole C‐nucleosides 4 and the synthon 1 gave a mixture of pyrazolo[1,5‐a]pyrimidine C‐nucleosides, which was separated on a silica gel column. Attempts to remove the protecting groups yielded pyranose derivative 10. Another synthon 1,3‐dimethyl‐5‐azauracil and 3‐aminopyrazoles 12 gave pyrazolo[1,5‐a]triazines 13. In a similar reaction with 3‐aminopyrazole C‐nucleosides 4 gave the corresponding pyrazolo[1,5‐a]‐triazine C‐nucleosides 14 and 15.
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