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 Bulky Diarylammonium Arenesulfonates as Selective Esterification Catalysts, published in 2005-03-30, which mentions a compound: 37443-42-8, Name is Methyl tetrahydrofuran-2-carboxylate, Molecular C6H10O3, Quality Control of Methyl tetrahydrofuran-2-carboxylate.
More environmentally benign alternatives to current chem. processes, especially large-scale, fundamental reactions such as ester condensations, are highly desirable for many reactions. Bulky diarylammonium pentafluorobenzenesulfonates and tosylates serve as extremely active dehydration catalysts for the ester condensation reaction of carboxylic acids with equimolar amounts of sterically demanding alcs. and acid-sensitive alcs. Typically, the esterification reaction is performed in heptane by heating at 80 °C in the presence of 1 mol % of the catalyst without removing water. Esterification with primary alcs. proceeds without solvents even at room temperature Furthermore, 4-(N-mesitylamino)polystyrene resin-bound pentafluorobenzenesulfonate can be recycled more than 10 times without activity loss.
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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics