Unambiguous structure determination of s
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Stefano Chimichi; Barbara Cosimelli; Fabrizio Bruni; Silvia Selleri
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Article
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1992
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John Wiley and Sons
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English
⚖ 376 KB
## Abstract The condensation of 3(5)‐aminopyrazole and 5‐amino‐3‐phenylpyrazole with ethyl 2,4‐dioxopentanoate and 2‐ethoxymethylidene‐3‐oxobutyrate has been re‐investigated. Contrary to previos reports, the former reaction gives rise to both regioisomeric pyrazolo [1,5‐a]pyrimidines (5‐carbethoxy‐