Cyclopentenone

Cyclopentenone is an organic compound with the chemical formula (CH 2) 2(CH) 2CO[1]. It contains two functional groups, a ketone and an alkene, and is a colorless liquid. The term cyclopentenone can also refer to a structural motif where the cyclopentenone moiety is a subunit of a larger molecule[1].

Cyclopentenones are found in a large number of natural products, including jasmone, the aflatoxins, and several prostaglandins[1]. They can be synthesized in various ways, such as through the elimination of α-bromo-cyclopentanone using lithium carbonate, Claisen condensation-decarboxylation-isomerization cascades of unsaturated diesters, acid-catalyzed dehydration of cyclopentanediols, Nazarov cyclization reaction from divinyl ketones, Saegusa–Ito oxidation from cyclopentanones, ring-closing metathesis from the corresponding dienes, oxidation of the corresponding cyclic allylic alcohols, and the Pauson–Khand reaction from alkenes, alkynes, and carbon monoxide[1].

As an enone, 2-cyclopentenone undergoes typical reactions of α-β unsaturated ketones, including nucleophilic conjugate addition, the Baylis–Hillman reaction, and the Michael reaction[1]. Cyclopentenone also functions as an excellent dienophile in the Diels–Alder reaction, reacting with a wide variety of dienes[1].

Cyclopentenone prostaglandins (cyPGs) are biologically active lipid mediators that have been found to be potent inhibitors of viral replication and are effective against a wide range of viruses[2][3]. They have anti-inflammatory effects and have been explored as therapeutic agents for viral infections[2][3].

Citations:

[1] https://en.wikipedia.org/wiki/Cyclopentenone

[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8320392/

[3] https://pubmed.ncbi.nlm.nih.gov/31931079/

[4] https://www.sigmaaldrich.com/US/en/product/aldrich/c112909

[5] https://www.ebi.ac.uk/chebi/searchId.do%3Bjsessionid=99F7DB807A63BDADB579010497B0637B?chebiId=CHEBI%3A141550