Tautomeric structure of dihydropyrazolo[1,5‐<i>a</i>]‐pyrimidin‐7‐one in a solution. A facile synthesis of novel 6‐quinoxalinyldihydropyrazolo[1,5‐<i>a</i>]pyrimidin‐7‐ones by ring transformation

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<jats:title>Abstract</jats:title><jats:p>6‐Quinoxalinyldihydropyrazolo[1,5‐<jats:italic>a</jats:italic>]pyrimidin‐7‐ones <jats:bold>4a‐d</jats:bold> were synthesized by the ring transformation of 3‐(<jats:italic>N,N</jats:italic>‐dimethylcarbamoyl)furo[2,3‐<jats:italic>b</jats:italic>]quinoxaline hydrochloride <jats:bold>5</jats:bold>. Compounds <jats:bold>4a‐d</jats:bold> were found to exist as the 4,7‐dihydro‐7‐oxo form <jats:bold>E</jats:bold> in dimethyl sulfoxide based on the nmr spectral data.</jats:p>

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