1. Dress, B. E.; Chakravarty, L.; Prestwich, G. D.; Dorman, G.; Kavecz, M.; Lukacs, A.; Urge, L.; Darvas, F.; Rzepecki, P. W.; Ferguson, C. G. W.O. Patent 016,245, 2005; Chem. Abstr. 2005, 142, 261534.
2. Kung, D. W. S.; Fuller, G. U.S. Patent 266,815, 2004; Chem. Abstr. 2005, 142, 266815.
3. Hoehn, H. U.S. Patent 3,935,222, 1976; Chem Abstr. 1976, 85, 21351.
4. Reaction of 5-amino-1-aryl-3-methylpyrazoles with benzylidene derivatives of meldrum's acid: Synthesis and characterization of pyrazolo[3,4-b]pyridinones
5. Study of the heterocyclization ofvic-substituted hydrazides of acetylenylpyrazolecarboxylic acids intoN-amino pyrazolopyridinones