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 Asymmetric protonation of lithium enolate of α-amino acid derivatives using chiral Bronsted acids, published in 2001-12-31, which mentions a compound: 37443-42-8, Name is Methyl tetrahydrofuran-2-carboxylate, Molecular C6H10O3, SDS of cas: 37443-42-8.
Chiral alcs. possessing an asym. 2-oxazoline ring were synthesized as new chiral Bronsted acids from tetrahydro-2-furoic acid and (1S,2R)-2-amino-1,2-diphenylethanol. These alcs. were superior to (S,S)- or (R,R)-imide reported previously as a chiral proton source for enantioselective protonation of lithium enolate of an alanine derivative
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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics