A metal- and base-free, robust, and convenient approach for the synthesis of isoxazoline
derivatives is reported. This protocol involves 1,3-dipolar cycloaddition between
in situ generated nitrile oxides from the corresponding aldoximes using [hydroxy(tosyloxy)iodo]benzene
(HTIB, Koser’s reagent) and maleimides, styrene and acrylonitrile. The described methodology
is very attractive as it is operationally simple, has broad scope, and does not require
any base, metal, or other additives.
Key words
arylaldoximes - C–C and C–O bond formation - fused isoxazolines - heterocycles - hypervalent
iodine - nitrile oxides - oxidation