Abstract
| - 3,5-Disubstituted isoxazoles are obtained in good yields bya convenient one-pot, three-step procedure utilizing a regioselective copper(I)-catalyzed cycloaddition reaction betweenin situ generated nitrile oxides and terminal acetylenes.Most functional groups do not interfere with the reaction,which can be performed in aqueous solvents without protection from oxygen. Since all reagents are used in stoichiometric amounts, formation of byproducts is minimized.
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