Thiophene is a five-membered heterocyclic compound containing a sulfur heteroatom with the molecular formula C4H4S. Thiophene is aromatic and is very similar to benzene; electrophilic substitution reaction is easier than benzene, and it is mainly substituted at the 2-position. Thiophene ring system has certain stability to oxidant.
Quinolines are an important class of biologically active heterocyclic compounds, and their derivatives usually exhibit a variety of biological activities. They can be used as antimalarial drugs and in the preparation of other antimalarial drugs. Other important activities of quinoline derivatives include inhibitory activity against EGFR-TK and antipsychotic activity. Futhermore, quinoline scaffolds are present in various drug molecules, including the antimalarial drugs aablaquine, chloroquine, mefloquine and primaquine, and the antibacterial agents gatifloxacin, levofloxacin, and moxifloxacin.
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Benzothiazoles are aromatic heterocyclic compounds with the chemical formula C7H5NS. Benzothiazoles and their derivatives are a very important class of heterocyclic compounds that are ubiquitous in nature and are mainly used in medicine, agriculture and industry. In medicine, benzothiazole derivatives are a kind of very important pharmaceutical intermediates with good pharmacological and biological activities. It can be used as a fungicide, anti-tuberculosis drug, anti-malarial, anti-convulsant, insecticide, sedative and anti-inflammatory drug, and can also be used to treat diabetes and has anti-cancer effects.
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