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 Microbial asymmetric reduction of ethyl 4-chloro-3-oxobutanoate to optically active ethyl 4-chloro-3-hydroxybutanoate, published in 1990-08-31, which mentions a compound: 90866-33-4, Name is (R)-Ethyl 4-chloro-3-hydroxybutanoate, Molecular C6H11ClO3, Recommanded Product: 90866-33-4.
The synthesis of Et (R)-4-chloro-3-hydroxybutanoate through the asym. reduction of Et 4-chloro-3-oxobutanoate with the NADPH-dependent aldehyde reductase of Sporobolomyces salmonicolor AKU 4429 is described. Under preparative scale reaction conditions with the acetone-fractionated aldehyde reductase, the amount of Et 4-chloro-3-hydroxybutanoate reached 33.2 mg/mL (molar yield, 74.0%). Furthermore, conversion to Et (S)-4-chloro-3-hydroxybutanoate occurred on incubation with washed cells of Trichosporon cutaneum AKU 4864 as the catalyst.
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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem