Jeng, Huey-Jiuan published the artcileFormation of pyrrole derivatives from heteroatom-substituted acetonitriles, Synthetic Route of 5098-14-6, the publication is Journal of the Chinese Chemical Society (Taipei) (1994), 41(6), 803-11, database is CAplus.
Aminomalononitrile reacted with conjugated carbonyl compounds to give 3H-pyrrolines. Treatment of 2-chloro-2-phenylthioacetonitrile with alkenes in the presence of potassium t-butoxide afforded 1-phenylthiocyclopropanecarbonitriles, which reacted with nucleophiles in 1,2-, 1,4- or 1,6-addition modes. The 1,2-adducts (cyclopropylimines) rearranged in situ to give substituted pyrroles.
Journal of the Chinese Chemical Society (Taipei) published new progress about 5098-14-6. 5098-14-6 belongs to nitriles-buliding-blocks, auxiliary class Nitrile,Salt,Sulfonic acid,Amine,Benzene, name is 2-Aminomalononitrile 4-methylbenzenesulfonate, and the molecular formula is C10H11N3O3S, Synthetic Route of 5098-14-6.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts