Abu-Shanab, Fathi A. published the artcileα,α-Dioxoketene dithioacetals as starting materials for the synthesis of polysubstituted pyridines, Category: nitriles-buliding-blocks, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1994), 1449-52, database is CAplus.
Reactions of 3-acetyl-4,4-bis(methylthio)but-3-en-2-one and Me 2-acetyl-3,3-bis(methylthio)-prop-2-enoate with cyanothioacetamide, cyanoacetamide, or 2-amino-1,3,3-tricyanoprop-1-ene and base, followed by treatment with acid, give polysubstituted pyridines. Further elaboration of these products leads to bicyclic systems such as thieno[2,3-b]pyridines and pyrazolo[3,4-c]pyridine and then to tricyclic systems including pyrazolo[3,4-d]thieno[2,3-b]pyridine and dipyrazolo[3,4-b:3′,4′-d]pyridine.
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, Category: nitriles-buliding-blocks.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts