Kumar, Arvind published the artcileKetene dithioacetals. Part 11. Reaction of 3-cyano-4-methylthio-2(1H)-pyridones with hydrazine and guanidine: synthesis of novel substituted and fused pyrazolo[4,3-c]pyridone and pyrido[4,3-d]pyrimidine derivatives, HPLC of Formula: 57663-05-5, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1978), 857-62, database is CAplus.
The N-methylpyridones I [R = Me, R1 = H, R2 = 4-R3C6H4, R3 = H, Me, MeO, Cl, Br; R = R2 = Me, R1 = H; R = Me, R1R2 = (CH2)3, (CH2)4] and the benzoquinolone II (R = Me, R1 = H, n = 1) were prepared by alkylation of I (R = H, R1, R2 as before) and II (R = R1 = H, n = 1), resp., with Me2SO4-NaOMe, followed by heating the mixture of N-Me and O-Me products with MeI. Treatment of I (R = H, Me, R1 = H, R2 = 4-R3C6H4, R3 = H, Me, MeO, Cl, Br; R = R2 = Me, R1 = H; R = R1 = H, R2 = 3-, 4-pyridyl; R = H, R1 = Ph, R2 = Me) with NH2NH2 in refluxing Me2CHOH gave 70-90% pyrazolopyridones III. Similar treatment of I [R = H, Me, R1R2 = (CH2)3, (CH2)4; R = H, R1R2 = (CH2)5] and II (R = H, Me, MeO, R1 = H, n = 1; R = R1 = H, n = 2) gave 68-80% III (R, R1, R2 as before) and 64-78% pyrazolopyridone IV (R, R1, n as before), resp. Reaction of I [R = Me, R1 = H, R2 = 4-R3C6H4, R3 = H, Me, MeO, Cl, Br; R = Me, R1R2 = (CH2)3, (CH2)4] and II (R = Me, R1 = H, n = 1) with guanidine in the presence of 2 mol of NaOEt gave 31-71% pyridopyrimidinone V (R, R1, R2 as before) and 41% pyrimidoquinolinone VI.
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, HPLC of Formula: 57663-05-5.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts