1. Synthesis of tricyclic pyridones by radical cyclization
2. Reviews on the synthesis of pyridones: (a) McKillop, A.; Boulton, A. InComprehensive Heterocyclic Chemistry; Katritzky, A. R., Rees, C. W., Eds.; Pergamon Press: New York, 1984; Vol. 2, Part 2A, p 67 ff. (b) Jones, G. InComprehensive Heterocylic Chemistry; Katritzky, A. R., Rees, C. W., Eds.; Pergamon Press: New York, 1984; Vol. 2, Part 2A, p 395.