Keywords
1,3-dipolar cycloaddition
alkynes
iron nitrate
isoxazoles
isoxazolines
nitration
Abstract
Iron(III) nitrate-assisted cycloaddition of (phenylsulfonyl)ethene to arylacetylenes in the presence of KI affords 5-phenylsulfonyl-3-aroylisoxazolines whose treatment with K2CO3 provides 4,5-unsubstituted 3-aroylisoxazoles. Both synthetic steps can be performed in a one-pot manner.
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