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  • Title: Synthesis of pyrrolo- and pyrido[1,2-a]xanthene [1,9-de]azepines: a study of the azepine ring construction.
    Author: de la Fuente MC, Domínguez D.
    Journal: J Org Chem; 2007 Nov 09; 72(23):8804-10. PubMed ID: 17929978.
    Abstract:
    Pentacyclic pyrrolo- and pyrido[1,2-a]xanthene[1,9-de]azepines were synthesized in various oxidation states by assembling the azepine ring following two strategies: 7-endo-trig cyclization of the aryl radical derived from a gamma-methylene lactam and cyclodehydration of aldehydes. Other strategies examined (Heck reaction and intramolecular acylation) did not afford azepines, but six-membered nitrogenated rings.
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