Synthesis of pyrrolo- and pyrido[1,2-a]xanthene [1,9-de]azepines: a study of the azepine ring construction

J Org Chem. 2007 Nov 9;72(23):8804-10. doi: 10.1021/jo701568w. Epub 2007 Oct 12.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Azepines / chemical synthesis*
  • Azepines / chemistry
  • Cyclization
  • Molecular Structure
  • Stereoisomerism

Substances

  • Azepines