In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Quinolinium thiocyanate, published in 1950, which mentions a compound: 530-66-5, Name is quinoliniumhydrogensulphate, Molecular C9H9NO4S, SDS of cas: 530-66-5.
The reaction of BzCl with quinoline (I) and CHNa(CO2Et)2 did not yield the desired 1,2-dihydroquinoline, since most of the I was recovered; the products (as determined by hydrolysis) are CHBz(CO2Et)2 and Bz(BzO)C:C(CO2Et)2. I (63 g.) and 156 g. KSCN in 600 ml. H2O, treated (7 min.) with 148 g. BzCl and stirred 1 hr., give 77% quinolinium thiocyanate, light yellow, m. 141-1.5°; FeCl3 gives a deep red color; heated 1 hr. on the steam bath with concentrated HCl it yields quinolinium H sulfate, m. 162-4°.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com