Tominaga, Yoshinori published the artcileA new synthesis of 3,4-diaminothiophenes, Category: pyridine-derivatives, the publication is Heterocycles (1977), 6(11), 1871-6, database is CAplus.
Thiophenediamines I (R = CN, CONH2, CO2Et, Bz) were prepared by treating R1CH2CNCl– (R1 = pyridinio) with CS2-NaOH, treating R1C(CN):C(SNa)S– with R2CH2R (R2 = Cl, Br), cyclizing R1C(CN):C(S–)SCH2R with NEt3, methylating ylides II (R3 = S–), treating II (R3 = SMe) with MeNH2-HCl and neutralizing. I condensed with R4COCOR4 (R4 = H, Me, Ph) to give the thienopyrazines III.
Heterocycles 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 C10H15NO, Category: pyridine-derivatives.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem