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.
Morpholine contains secondary amine groups and has all the typical reactive characteristics of secondary amine groups. It can react with inorganic acids to form salts, and react with organic acids to form salts or amides, which can be subjected to alkylation reaction, and can also be reacted with ethylene oxide, ketone or Willgerodt reaction. Morpholine is a six-membered ring containing oxygen and nitrogen, and its alkalinity is much lower than that of its parent piperidine. The marketed morpholine drugs are mainly distributed in the fields of tumors, cardiovascular and cerebrovascular diseases, respiratory system diseases, digestive system diseases, infectious diseases and mental disorders.
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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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