Cu(I)/Chiral Bisoxazoline-Catalyzed Enantioselective Sommelet–Hauser Rearrangement of Sulfonium Ylides
作者:Shu-Sen Li、Jianbo Wang
DOI:10.1021/acs.joc.0c01590
日期:2020.10.2
asymmetric thia-Sommelet–Hauser rearrangement of sulfonium ylides remains a great challenge due to its multistep reaction mechanism involving metal carbene formation, proton transfer, and [2,3]-sigmatropic rearrangement. In particular, the key problem of such reactions is the differentiation of the enantiotopic lone pair electrons of sulfur, which generates the sulfonium ylide intermediate bearing chirality
its的催化不对称硫杂-索姆米勒-豪瑟重排反应仍然是一个巨大的挑战,因为它的多步反应机制涉及金属卡宾的形成,质子转移和[2,3]-σ重排。特别地,这种反应的关键问题是硫的对映体孤对电子的分化,这产生了在硫原子上具有手性的叶立德中间体。用修饰的手性双恶唑啉配体,我们开发了具有良好至优异对映选择性的Cu(I)催化的不对称thia-Sommelet-Hauser重排。机理研究提供了对反应机理细节的见识。