Dimethylalkynylaluminum reagents derived from terminal alkynes and trimethylaluminum underwent addition to various N-activated α-amido sulfones to produce the corresponding alkynylamines in moderate to excellent yields. The optimized protocol avoids the preparation and isolation of relatively unstable N-activated imines that are generated in situ from their corresponding, stable, N-activated α-amido sulfones. This methodology provides access to a wide range of alkynylamines containing N-carbamoyl, -acyl, and -sulfonyl moieties.
Key words
dimethylalkynylaluminum reagents - nucleophilic addition - propargylamines -
N-activated α-amido sulfones - alkynylamines