Abstract
AbstractMasked o‐benzoquinones, on reaction with nitrile oxides generated in situ from the corresponding hydroxamoyl chlorides, provide [3+2] cycloaddition products or novel isoxazoline derivatives through an unprecedented rearrangement. The isolated [3+2] cycloadducts could be transformed into the corresponding isoxazoline derivatives in the presence of Et3N and highly functionalized benzisoxazoles in the presence of 4 N HCl.
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