Kakehi, Akikazu published the artcilePreparation of new nitrogen-bridged heterocycles. 42. Synthesis and the reaction of pyridinium N-ylides using bifunctional ethyl thiocyanatoacetates, COA of Formula: C7H7ClN2, the publication is Bulletin of the Chemical Society of Japan (1996), 69(6), 1769-1776, database is CAplus.
Various pyridinium (monosubstituted methylide)s I (R2, R3, R4 = H, Me; R5 = cyano, CO2Et, COMe, COPh) were smoothly attached to the cyano group in Et thiocyanatoacetate or Et 2-thiocyanatopropionate to afford the corresponding pyridinium (substituted cyanomethylide)s II in low-to-moderate yields, while pyridinium (unsubstituted amidate)s III (R1, R2, R3 = H, Me) reacted with the ester carbonyl group in the same reagents to give pyridinium (thiocyanatoacetato)- or (2-thiocyanatopropiono)amidates IV in considerable yields. The 1,3-dipolar cycloadditions of some pyridinium (unsym. substituted cyanomethylide)s with di-Me acetylenedicarboxylate (DMAD) in various solvents afforded only di-Me 3-cyanoindolizine-1,2-dicarboxylate, except for a few examples. On the other hand, the treatment of pyridinium (thiocyanatoaceto)- or (2-thiocyanatopropiono)amidates with a strong base, such as potassium tert-butoxide, gave new bicyclic mesoionic compounds, N-[2-(1,3,4-thiadiazolo[3,2-a]pyridinio)]acetamidate derivatives V, in moderate yields. The intermediacy of N-[1-(2-thiocyanatopyridinio)]acetamidates in the formation reactions of the latter compounds was also proven by independent syntheses.
Bulletin of the Chemical Society of Japan 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 C7H7ClN2, COA of Formula: C7H7ClN2.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem