Rastogi, R. R. published the artcileKetene SS-acetals. Part 9. Reaction of α-oxo- and α-cyano-ketene SS-acetals with cyanoacetamide: a new general method for substituted and fused 4-alkylthio-3-cyano-2(1H)-pyridones and formation of novel pyridones through base-induced rearrangements, Safety of 6-Methyl-4-(methylthio)-2-oxo-1,2-dihydropyridine-3-carbonitrile, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1978), 549-53, database is CAplus.
Fourteen acylketene S,S-acetals RCOCR1:C(SR2)2 (R = aryl, pyridyl, alkyl; R1 = H, aryl; R2 = alkyl, aralkyl), on treatment with NCCH2CONH2 in base, gave 65-85% pyridones I. α-Cyanoacetals NCCR:C(SMe)2 (R = CN, Ph, p-ClC6H4, p-MeC6H4) gave lower yields of the corresponding 6-aminopyridones. The method was successfully extended to cyclic ketene S,S-acetals, giving fused pyridones, benzoquinolone derivatives, and a (benzocyclohepta)pyridone derivative α-Alkyl-α-acylketene S,S-acetals with NCCH2CONH2 gave novel pyridones, e.g. II (R = MeSCH2, CH2:CH), formed by initial base induced proton migration in these acetals.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 57663-05-5. 57663-05-5 belongs to nitriles-buliding-blocks, auxiliary class Fused/Partially Saturated Cycles,Tetrahydropyrimidins, name is 6-Methyl-4-(methylthio)-2-oxo-1,2-dihydropyridine-3-carbonitrile, and the molecular formula is C8H8N2OS, Safety of 6-Methyl-4-(methylthio)-2-oxo-1,2-dihydropyridine-3-carbonitrile.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts