Tominaga, Yoshinori published the artcileSynthesis and reaction of 3,4-diaminothiophenes, Synthetic Route of 17281-59-3, the publication is Yakugaku Zasshi (1979), 99(11), 1081-90, database is CAplus.
Addition of pyridinium chloride I and CS2 gave Ia, which was alkylated by XCH2Y (X = Cl, Br; Y = CN, CO2Et, Bz, CONH2), cyclized, and iodomethylated to give II (R1 = CN, CO2Et, Bz, CONH2; R2 = pyridinio iodide). Cleavage of II iodide by addition of MeNH2 followed by cyclization, acid hydrolysis, and neutralization gave II (R1 = CN, CO2Et, Bz, CONH2; R2 = NH2). Also prepared were thieno[3,2-d]pyrimidinones III (R3 = Me, Ph; R4 = NH2, NHBz, pyridinio chloride) and the thieno[3′,4′:4,5]imidazo[1,2-a]pyridine IV.
Yakugaku Zasshi published new progress about 17281-59-3. 17281-59-3 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitrile,Salt, name is 1-(Cyanomethyl)pyridin-1-ium chloride, and the molecular formula is C12H9N3O4, Synthetic Route of 17281-59-3.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem