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 Synthesis of (S)-N-(benzyloxy)-4-(acetoxymethyl)-2-azetidinone, a potential intermediate for carbapenem antibiotics, by a chemomicrobiological approach, published in 1987-11-01, which mentions a compound: 58081-05-3, Name is (R)-4-Hydroxydihydrofuran-2(3H)-one, Molecular C4H6O3, Electric Literature of C4H6O3.
(R)-Me3COCH2CH(OH)CH2CO2Et, which was prepared by Bakers’ yeast reduction of Me3COCH2COCH2CO2Et, was converted to (R)-3-hydroxybutyrolactone. After cleavage of the lactone ring with PhCH2ONH2, β-lactam cyclization of the hydroxamate was carried out by the Mitsunobu procedure with complete inversion of configuration at C-3 to give (S)-N-benzyloxy-4-acetoxymethyl-2-azetidinone (I). The (R)-azetidinone was also synthesized from (S)-malic acid via (S)-3-hydroxybutyrolactone.
Different reactions of this compound((R)-4-Hydroxydihydrofuran-2(3H)-one)Electric Literature of C4H6O3 require different conditions, so the reaction conditions are very important.
Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem