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Synthesis 1987; 1987(3): 288-290
DOI: 10.1055/s-1987-27921
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A New Facile Synthesis of 4-Oxo-1,4-dihydrocinnolines

Clara Baldoli* , Emanuela Licandro, Stefano Maiorana, Ernesto Menta, Antonio Papagni
  • *Dipartimento di Chimica Organica e Industriale dell'Università, Via Golgi 19, I-20133 Milano, Italy
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Publication Date:
12 September 2002 (online)

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2-(2-Aminoaryl)-2-oxo-triphenylphosphoniumethylides 2a-d, readily available by standard procedures, are converted into 4-oxo-1,4-dihydrocinnolines 7a-d by treatment with nitrous acid and subsequent basic hydrolysis of the intermediate phosphoranes 6a-d.

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