Rapid Photoassisted Access to N,O,S-Polyheterocycles with Benzoazocine and Hydroquinoline Cores: Intramolecular Cycloadditions of Photogenerated Azaxylylenes


  • This work is supported by the NIH (GM093930). We thank Prof. Tarek Sammakia of University of Colorado Boulder for insightful discussion.


original image

Ring the changes: A new photoassisted approach to give conformationally constrained N,O,S-polyheterocyclic scaffolds of unprecedented topologies was achieved by intramolecular [4+4] and [4+2] cycloadditions of photogenerated o-azaxylylenes (23 examples; see scheme). The precursors can be readily assembled by simple and high-yielding reactions, thus making this a powerful synthetic method amenable to high-throughput diversity-oriented synthesis.