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 tert-Butylpyrroles, published in 1970, which mentions a compound: 2199-44-2, Name is Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, Molecular C9H13NO2, Recommanded Product: 2199-44-2.
Reaction of 3-(R-substituted)-2,4-dimethylpyrroles (R = CO2Et or Ac) with tert-BuOAc in the presence of strong acids, e.g. H2SO4, HClO4, or HI gave 12-30% corresponding 5-tert-butyl compounds (I). Treatment of I (R = CO2Et) with H3PO4 gave 43% I (R = H). Similar reactions were performed with 5-(ethoxycarbonyl)-2,4-dimethylpyrrole.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com