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 Synthesis of pyrrolecarboxaldehydes, published in 1956, which mentions a compound: 2199-44-2, Name is Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, Molecular C9H13NO2, Safety of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate.
HCO-NMe2 (I) (23.89 g.) and 58.25 g. POCl3 warmed after 10 min. to 60°, treated dropwise in 1.5 hrs. with 18 g. 2,4-dimethylpyrrole in an equal volume of I, the mixture stirred 1 hr. at 60°, poured into 333 g. ice and 245 g. fused NaOAc, the mixture boiled, cooled, extracted with Et2O, the extract evaporated free from Et2O and made alk. with powd. Na2CO3, filtered, and the residual product (II) dried. Further extraction of the filtrate with Et2O gave another 0.69 g. II. II boiled in petr. ether, the solution purified with C, filtered and cooled gave 0.6 g. (crude) 2,4-dimethyl-3,5-pyrroledicarboxaldehyde, m. 165-6° (from H2O), and 9.6 g. (crude) 2,4-dimethyl-5-pyrrolecarboxaldehyde, m. 89-90° (from H2O). Similarly, I and POCl3 at 60°, treated dropwise with stirring with 2,4-dimethyl-8-ethylpyrrole gave 2,4-dimethyl-3-ethyl-5-pyrrolecarboxaldehyde, m. 105-6°. In the same way, 1.79 g. I and 4.37 g. POCl3 treated with 1.35 g. 2,3,4-trimethylpyrrole gave 0.3 g. 2,3,4-trimethyl-5-pyrrolecarboxaldehyde, m. 147°; 2.6 g. I and 6.32 g. POCl3 with 3 g. Et 2,4-dimethyl-3-pyrrolecarboxylate in I yielded Et 2,4-dimethyl-5-formyl-3-pyrrolecarboxylate, m. 165°; 8.6 g. I and 21 g. POCl3 with 10 g. Et 2,4-dimethyl-5-pyrrolecarboxylate and 10 g. I produced 11.2 g. Et 2,4-dimethyl-3-formyl-5-pyrrolecarboxylate, m. 145°. Heating 20 g. 2,4-dimethyl-5-carbethoxy-3-pyrrolecarboxylate at 200° with 200 g. quinoline and 2 g. finely divided pure Cu to cessation of CO2 evolution, cooling, filtering, acidifying the filtrate with 50% HCl, filtering, washing the precipitate with H2O, and drying gave 11.2 g. Et 2,4-dimethyl-5-pyrrolecarboxylic acid, m. 122°.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com