Chiral Hypervalent Bromine(III) (Bromonium Salt): Hydrogen- and Halogen-Bonding Bifunctional Asymmetric Catalysis by Diaryl-λ<sup>3</sup>-bromanes
作者:Yasushi Yoshida、Takashi Mino、Masami Sakamoto
DOI:10.1021/acscatal.1c04070
日期:2021.11.5
Bromonium salts, which are hypervalent bromine reagents, have been explored as being strong electrophiles owing to their extremely high nucleofugalities. Only one example of their catalytic application has been reported by our group; however, their chiral versions have not yet been researched. Halogen-bonding (XB) has been widely applied in chemistry; however, its successful application to highly enantioselective
溴鎓盐是高价溴试剂,由于其极高的离核性,已被研究为强亲电试剂。我们小组只报道了一个催化应用的例子;然而,他们的手性版本尚未被研究。卤素键合(XB)在化学中得到了广泛的应用;然而,其在高对映选择性路易斯酸催化中的成功应用尚未实现。在此,我们报告了手性环状二芳基溴鎓盐的设计和开发。这些催化剂实现了高度对映选择性的路易斯酸 XB 催化,提供了高达 96% ee 的产物。
Copper-Catalyzed Dual Remote Asymmetric Vinylogous Alkynylallylic Substitution of Yne-Allylic Esters with Coumarins
作者:Xin-Ru Wang、Meng-Die Li、Zi-Han Wang、Hui Zhu、Jia-Run Wang、Ying-Ying Wei、Tao-Yan Lin
DOI:10.1021/acs.orglett.4c02199
日期:2024.8.2
structural motifs found in an array of biologically and therapeutically active natural products and drugs. Herein, a highly enantioselective dual remote copper-catalyzed vinylogous alkynylallylic substitution of yne-allylic esters with coumarins has been developed. The practicality of this method is exemplified by the use of readily available starting materials; mild reaction conditions; excellent