Organoselenium-Catalyzed Asymmetric Cyclopropanations of (<i>E</i>)-Chalcones
作者:Pei-Tung Cheng、Yu-Hsun Tseng、Rong-Jie Chein
DOI:10.1021/acs.orglett.1c03243
日期:2021.10.15
compounds were used to catalyze asymmetriccyclopropanation reactions; the selenonium ylide intermediates formed from these selenium-containing catalysts and benzyl bromide efficiently react with (E)-chalcones to give various cyclopropanes (27 examples) with excellent enantioselectivities of ≤99% ee and are the first examples of organoselenium-catalyzed asymmetriccyclopropanations.
我们报告了一类新的基于 ( S )-二苯基(四氢硒酚-2-基) 甲醇的手性四氢硒酚,其由 ( R )-3-(3-溴丙基)-2,2-二苯基环氧乙烷和硒化钠制备。这些手性四氢硒酚类化合物用于催化不对称环丙烷化反应;由这些含硒催化剂和苄基溴形成的硒叶立德中间体与 ( E )-查耳酮有效反应,得到各种环丙烷(27 个实例),具有≤99% ee 的优异对映选择性,是有机硒催化不对称环丙烷化的第一个实例。
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