Pyridine is a six-membered heterocyclic compound containing one nitrogen heteroatom. Pyridine and piperidine are the most frequently occurring heterocyclic building blocks in drug molecules. According to incomplete statistics, there are currently more than 180 drugs containing pyridine or piperidine structure that have been marketed, nearly 1/5 of the drugs approved for marketing in recent years contain these two structures.
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Pyridine is a basic heterocyclic organic compound with the chemical formula C5H5N. It is structurally related to benzene, with one methine group (=CH−) replaced by a nitrogen atom. It is a highly flammable, weakly alkaline, water-miscible liquid with a distinctive, unpleasant fish-like smell.
Dibenzofuran is an organic compound (C12H8O) consisting of two benzene rings fused to a central furan ring. Dibenzofuran can be synthesized by annealing and oxidative coupling methods of diphenyl ether, biphenyl derivatives, benzofuran, quinone. Most of the dibenzofuran-related natural products are metabolites of lichens or higher fungi. Lichen dibenzofurans appear to be formed by carbon-carbon oxidative coupling of orsellinic acid and its homologs.
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