Cacciari, Barbara published the artcileFacile and versatile route to the synthesis of fused 2-pyridones: useful intermediates for polycyclic systems, Safety of 3-Aminopyridazine-4-carbonitrile, the publication is Synthetic Communications (2006), 36(9), 1177-1183, database is CAplus.
The reaction of various heteroaromatic amino nitriles with di-Et malonate under basic conditions is reported. This reaction affords a series of different highly functionalized 2-pyridone condensed systems, which can be suitable intermediates in the construction of polyheterocyclic structures.
Synthetic Communications published new progress about 119581-52-1. 119581-52-1 belongs to pyridazine, auxiliary class Pyridazine,Nitrile,Amine, name is 3-Aminopyridazine-4-carbonitrile, and the molecular formula is C5H4N4, Safety of 3-Aminopyridazine-4-carbonitrile.
Referemce:
https://en.wikipedia.org/wiki/Pyridazine,
Pyridazine | C4H4N2 – PubChem