Bismuth Triflate‐Catalyzed Addition of Allylsilanes to N‐Alkoxycarbonylamino Sulfones: Convenient Access to 3‐Cbz‐Protected Cyclohexenylamines

Bismuth triflate was found to be an efficient catalyst in the Sakurai reaction of allyltrimethylsilanes with N‐alkoxycarbonylamino sulfones. The reaction proceeded smoothly with a low catalyst loading of Bi(OTf)₃⋅4 H₂O (2–5 mol%) to afford the corresponding protected homoallylic amines in very good yields (up to 96%). A sequential allylation reaction followed by ring‐closing metathesis delivers 6–8 membered 3‐Cbz‐protected cycloalkenylamines.