Covers single-heteroatom heterocycles: the nitrogen, oxygen and sulfur containing rings pyridine, pyran, furan and thiophene, then pyrrole's structure, aromaticity by Hückel's rule and reactions. It moves on to porphyrin rings in haem, haemoglobin and methaemoglobin, then indole and tryptophan, ending with serotonin and melatonin. Several sections are only headings or picture labels, so the text is thinner than the list suggests.
Topic 36 of 42 in the MU Sofia syllabus for Chemistry (Dental Medicine, Year 1). The free AceMed note covers it in 8 sections, about 999 words (7 min of reading), with 15 flashcards.
In this note
Heterocyclic compounds with one heteroatom.
Pyrrole. Structure.
Acid-base properties and reaction with halogens (bromine or iodine).
Compounds containing a porphyrin ring: protoporphyrin, haeme and haemin. Haemoglobin and methaemoglobin.
Hemoglobin:
Indole (benzopyrrole).
Tryptophan.
Neurotransmitters - serotonin and melatonin.
Heterocyclic compounds with one heteroatom.
Definition: Heterocyclic compounds are cyclic molecules that contain at least one heteroatom, which is an atom other than carbon, within their ring structures.
Common Heteroatoms: The most frequently occurring heteroatoms in heterocyclic compounds are nitrogen (N), oxygen (O), and sulfur (S).
Biological Importance of Nitrogen-Containing Heterocyclic Compounds:
Pyridine: Found in many biologically active compounds and pharmaceuticals, pyridine is a six-membered heterocyclic ring containing one nitrogen atom. It is a structural component of vitamins, alkaloids, and various drugs.
Pyran: A six-membered heterocyclic compound containing one oxygen atom in the ring. It is present in natural products and some pharmaceuticals, contributing to their biological activity.
Furan: A five-membered heterocyclic compound with one oxygen atom in the ring. Furan derivatives are important in organic synthesis and are found in various natural products and pharmaceuticals.
Thiophene: A five-membered heterocyclic compound containing one sulfur atom in the ring. Thiophene derivatives are significant in materials science, pharmaceuticals, and agrochemicals due to their diverse properties and biological activities.
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