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 Silver-Induced [3+2] Cycloaddition of Isocyanides with Acyl Chlorides: Regioselective Synthesis of 2,5-Disubstituted Oxazoles, published in 2019, which mentions a compound: 92-71-7, Name is 2,5-Diphenyloxazole, Molecular C15H11NO, Computed Properties of C15H11NO.
A silver-induced cycloaddition of isocyanides with acyl chlorides were developed. This transition metal-catalyzed strategy provided an effective and scalable approach for the formation of 2,5-disubstituted oxazoles in good to high yields. The employed silver-based MOF catalyst can be efficiently recycled without compromising the yield.
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Reference:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica