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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Pyrimidine, also known as 1,3-diazobenzene, is a heterocyclic compound with the chemical formula C4H4N2. Pyrimidine is formed by substituting 2 nitrogen atoms for 2 carbons in the meta-position of benzene. It is a diazine and retains its aromaticity. Derivatives of pyrimidine widely exist in organic macromolecular nucleic acids, and many drugs also contain pyrimidine rings. In nucleic acids, three nucleobases are pyrimidine derivatives: cytosine, thymine and uracil. There are a variety of pyrimidine-containing drugs on the market, most of which are kinase inhibitors.
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