Abstract
An easy and efficient synthesis of phenanthrene derivatives through base catalyzed ring transformation of 4- sec-amino-2-oxo-5,6-dihydro-2 H-benzo[ h]chromene-3-carbonitriles with acetyltrimethylsilane is described in good yields. The advantage of this reaction is the direct transformation of 2-oxobenzo[ h]chromene into phenanthrene via C–C insertion from acetyltrimethylsilane.
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