Cu(OAc) 2 ‐Catalysed Oxidative Dual C–H/N–H Activation of Terminal Alkynes and N ‐Deprotected Sulfonimidamides: An Easy Access to N ‐Alkynylated Sulfonimidamides

We report a mild and efficient Cu(OAc) 2 ‐catalysed protocol for the oxidative C–N cross‐coupling of terminal alkynes and N ‐deprotected sulfonimidamides. The reaction leads to hitherto unknown N ‐alkynylated sulfonimidamides. Furthermore, we found that the synthesised N ‐alkynylated sulfonimidamides could undergo silica‐gel‐mediated hydrolysis to give the corresponding N ‐acyl‐sulfonimidamides, as well as borane–dimethyl sulfide‐mediated reduction to give the corresponding N ‐alkylated sulfonimidamides.