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Article Abstract
Although the transition-metal-catalyzed [3+2] cycloadditions to access isoxazoles have been described well, organocatalytic methods remain underdeveloped. Herein, we report the use of an organophosphine catalyst for the preparation of a series of isoxazoles with exceptional regioselectivity via the [3+2] cycloaddition of -hydroxyamides and alkynes. The scope of this organocatalytic transformation is broad, tolerating numerous functional groups and proceeding uniformly in an environmentally friendly, simple, and efficient manner.
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