Synthesis of Pyrazoline-Derived N-Vinyl Nitrones through An Unexpected Selective [3+2] Cycloaddition

A variety of pyrazoline-derived N-vinyl nitrones were prepared in moderate to good yields with high diastereoselectivity through base-promoted regioselective [3+2] cycloaddition of N-vinyl chalcone nitrones with hydrazonoyl chlorides under mild...