In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called A highly stereoselective synthesis of anti-HIV 2′,3′-dideoxy- and 2′,3′-didehydro-2′,3′-dideoxynucleosides, published in 1992-07-03, which mentions a compound: 32780-06-6, Name is (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, Molecular C5H8O3, Category: catalyst-ligand.
A general total synthetic method for the stereocontrolled synthesis of 2′,3′-dideoxy- and 2′,3′-didehydro-2′,3′-dideoxynucleosides, is presented. Introduction of an α-phenylselenenyl group at the 2-position of 2,3-dideoxyribosyl acetate directs the glycosyl bond formation to give ≥95% β-isomer. This 2′-phenylselenenyl nucleoside may be converted to either the 2′,3′-dideoxynucleoside by treatment with n-Bu3SnH and Et3B at room temperature or to the unsaturated derivative by treatment with H2O2/cat. pyridine. The application of this method to the syntheses of pyrimidines (ddU, ddT, ddC), 6-substituted purines (ddA, ddT, 6-chloro-ddP, N6-Me-ddA), and 2,6-disubstituted pruines(2-F-ddA, 6-chloro-2-amino-ddP) as well as selected 2′,3′-didehydro-2′,3′-dideoxy derivatives, is reported.
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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI