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 4-Arylthieno[2,3-b]pyridines and 4-Aminothieno[2,3-b]pyridines via a Regioselective Bromination of Thieno[2,3-b]pyridine, published in 2015-12-18, which mentions a compound: 1445085-77-7, Name is Methanesulfonato(2-dicyclohexylphosphino-2′,6′-di-i-propoxy-1,1′-biphenyl)(2′-amino-1,1′-biphenyl-2-yl)palladium(II), Molecular C43H56NO5PPdS, Category: isoxazole.
The first regioselective, mild bromination of thieno[2,3-b]pyridine is described herein. The reaction proceeds with selectivity toward the 4-position (87% isolated yield). Subsequent cross-coupling reactions proceed in excellent yields and demonstrate the potential of 4-bromothieno[2,3-b]pyridine as a building block for use in drug discovery research.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem