Org. Lett. 2024, 26 (14), 2888-2892
DOI: 10.1021/acs.orglett.4c00431
Chalyk B.; Zginnyk O.; Khutorianskyi A.; Mykhailiuk P.
Electron-rich, electron-deficient, and non-activated alkenes can be rapidly functionalized by in situ-generated difluoromethyl nitrile oxide. The (3+2) cycloaddition proceeds at room temperature, has broad functional group tolerance, and can be used for the late-stage modification of bioactive molecules (finasteride and carbamazepine). The obtained CF2H-isoxazolines can be easily transformed into CF2H-containing building blocks for medicinal chemistry: amines, amino acids, amino alcohols, and spirocyclic scaffolds.