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Diastereoselective synthesis of propargylic N-hydroxylamines via NHC-copper(I) halide-catalyzed reaction of terminal alkynes with chiral nitrones on water.

The first NHC-copper(I)-halide catalyzed addition of terminal alkynes to enantiomerically pure nitrones on water is described. This reaction provides a straightforward access to propargylic N-hydroxylamines in excellent yield and with excellent stereoselectivity (up to 97%). The presented methodology was applied as a key step in the formal synthesis of (-)-lentiginosine.