Heterocycles · 1993 · 28 citations · 0 references
A series of arylnitrile oxides (6a-e) were reacted with captodative olefins (4) to yield 5-acetyl-3-arylisoxazoles. No intermediate isoxazolines were formed, the olefins thus behaved as acetylene equivalents. A plausible explanation for the observed regioselectivity in the process is offered as well