Reaction of N-substituted acetohydrazides with 2-substituted cinnamonitriles. Competitive cyclizations to pyrazolo[3,4-b]pyridinones and [1,2,4]triazolo[1,5-a]pyridinones

1. Hadi, A.
2. Martín, N.
3. Seoane, C.
4. Soto, J.L.