Synthesis of the title ring system by a sequential intermolecular nucleophilic displacement and intramolecular ‘conjugate’ addition has been achieved both as a one pot and as a stepwise procedure; an X-ray structure determination has been carried out to distinguish between the possible isomeric structures 8c-I and 8c-II.
F. Heaney, S. Bourke, C. Burke, D. Cunningham and P. McArdle, J. Chem. Soc., Perkin Trans. 1, 1998, 2255 DOI: 10.1039/A802750A
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