Zhu DY, Chen Y, Zhang XJ, Yan M. Regioselective conjugate addition of isoxazol-5-ones to ethenesulfonyl fluoride.
Org Biomol Chem 2022;
20:4714-4718. [PMID:
35622375 DOI:
10.1039/d2ob00737a]
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Abstract
The highly regioselective conjugate addition of isoxazol-5-ones to ethenesulfonyl fluoride (ESF) has been developed. In the presence of different bases, N2-alkylated and C4-alkylated isoxazol-5-ones with a sulfonyl fluoride group were obtained separately with good to excellent yields. Further transformations with amines and phenol gave sulfonamides and sulfonates. The intriguing combination of isoxazol-5-ones and the sulfonyl fluoride group produces valuable products for drug discovery.
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