Cu(I)/Chiral Bisoxazoline-Catalyzed Enantioselective Sommelet-Hauser Rearrangement of Sulfonium Ylides

Cu(I)/Chiral Bisoxazoline-Catalyzed Enantioselective Sommelet-Hauser Rearrangement of Sulfonium Ylides
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Cu(I)/手性双恶唑啉催化锍叶立德对映选择性 Sommelet-Hauser 重排

DOI:
10.1021/acs.joc.0c01590
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发表时间:
2020
影响因子:
3.6
通讯作者:
Jianbo Wang
Jianbo Wang
中科院分区:
化学2区
文献类型:
--
作者:
Shu-Sen Li;Jianbo Wang

文献摘要

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锍叶立德的催化不对称硫杂-索姆莱-豪瑟重排仍然是一个巨大的挑战,因为其多步反应机制涉及金属卡宾形成、质子转移和[2,3]-σ重排。特别是,此类反应的关键问题是硫的对映体孤对电子的分化,这会在硫原子上产生带有手性的锍叶立德中间体。利用修饰的手性双恶唑啉配体,我们开发了一种 Cu(I) 催化的不对称硫杂-Sommelet-Hauser 重排,具有良好至优异的对映选择性。机理研究提供了对反应机理细节的见解。
Catalytic 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 on the sulfur atom. With a modified chiral bisoxazoline ligand, we developed a Cu(I)-catalyzed asymmetric thia-Sommelet–Hauser rearrangement with good to excellent enantioselectivities. Mechanistic studies provide insights into the details of the reaction mechanism.