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 Facile Synthesis of 2-Methylquinolines via Pd-Catalyzed Aza-Wacker Oxidative Cyclization, published in 2008-01-17, which mentions a compound: 20028-53-9, Name is 2-Amino-5-chlorobenzaldehyde, Molecular C7H6ClNO, Related Products of 20028-53-9.
A novel Pd-catalyzed Wacker-type oxidative cyclization under air is described. By using this cyclization, a series of 2-methylquinolines, e.g., I, are readily prepared with good yields under mild conditions.
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Reference:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem