Cyclisation of 2-amino- or 2-acetamido-2′-methoxybenzophenones occurred in the presence of sodium hydride to give 9-acridones. This is a method of wide applicability for the synthesis of substituted acridones. A mechanism for the cyclisation is discussed.
J. H. Adams, P. Gupta, M. S. Khan, J. R. Lewis and R. A. Watt, J. Chem. Soc., Perkin Trans. 1, 1976, 2089 DOI: 10.1039/P19760002089
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