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.
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.
Benzofuran is an aromatic heterocyclic organic compound with the chemical formula C8H6O. It is a colorless oily liquid at room temperature with an aromatic odor. Benzofuran can be volatilized with water vapor and can be decomposed by potassium permanganate and other oxidants. It is an intermediate for the preparation of amiodarone and indene resin. Benzofuran derivatives are important pharmaceutical intermediates.
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Benzofuran is the heterocyclic compound consisting of fused benzene and furan rings. This colourless liquid is a component of coal tar.Benzofuran is extracted from coal tar. It is also obtained by dehydrogenation of 2-ethylphenol.
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