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 A Method for Iodination of Oxazoles at C-4 via 2-Lithiooxazoles, published in 1999-02-05, which mentions a compound: 118994-89-1, Name is Ethyl oxazole-5-carboxylate, Molecular C6H7NO3, Recommanded Product: Ethyl oxazole-5-carboxylate.
Lithiation and sequential iodination of oxazole derivatives gave mixtures of 4-iodooxazole derivatives, 2-iodooxazole derivatives and 2,4-diiodooxazole derivatives Metalation of 5-(4-methylphenyl)oxazole and coupling with 4-iodo-5-(2-phenylethyl)oxazole gave the resp. 2,4′-bisoxazole.
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