An Asymmetric Redox Arylation: Chirality Transfer from Sulfur to Carbon through a Sulfonium [3,3]-Sigmatropic Rearrangement
作者:Dainis Kaldre、Boris Maryasin、Daniel Kaiser、Oliver Gajsek、Leticia González、Nuno Maulide
DOI:10.1002/anie.201610105
日期:2017.2.13
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
据报道,乙酰胺和硫代炔与手性亚砜的一般不对称氧化还原芳基化反应。这是通过sulfur [3,3]-σ重排从硫到碳立体中心的一般1,4-手性转移的第一个例子。该反应在温和条件下以原子经济的方式提供α-芳基化的硫酯和酰胺。产物以高收率形成,对映体比例高达99.5:0.5。量子化学计算提出了从硫到碳的手性转移的机理,并解释了实验观察到的对映选择性与催化剂和底物的相关性。