4‐chirality transfer from sulfur to a carbon stereocenter through a sulfonium [3,3]‐sigmatropic rearrangement. This reaction delivers α‐arylated thioesters and amides under mild conditions in an atom‐economical manner. The products are formed in high yields with enantiomeric ratios up to 99.5:0.5. Quantum chemical calculations suggest a mechanism for the chirality transfer from sulfur to carbon and explain
α-Aminoacidderivatives are key components of the molecules of life. A hydrative amination of ynamides/thioalkynes under metal-free and mild conditions has been developed. This practical strategy offers a new and convenient avenue for the synthesis of α-aminoacidderivativesusing readily available sulfinamides as nitrogen sources. Computational studies suggest that the reaction is enabled by a new