of asymmetric cyclization reactions of 1,6-enynes have been established, simple asymmetric reductivecyclization remains underdeveloped. In this study, the enantioselectivereductivecyclization of alkynyl-tethered cyclohexadienones (1,6-enynes) has been developed via a chiral pincer rhodium catalyst, affording cis-hydrobenzofurans and cis-hydroindoles with high enantioselectivities (90–99% ee). Furthermore
尽管已经建立了各种类型的1,6-烯炔的不对称环化反应,但简单的不对称还原环化反应仍然不发达。在这项研究中,通过手性钳铑催化剂开发了炔基束缚的环己二酮(1,6-烯炔)的对映选择性还原环化,得到具有高对映选择性(90-99% ee)的顺式氢苯并呋喃和顺式氢吲哚。此外,还介绍了针对 SARS-CoV-2 3CL pro 的几种合成应用和初步抑制活性研究。
Cu-Catalyzed Asymmetric Borylative Cyclization of Cyclohexadienone-Containing 1,6-Enynes
作者:Ping Liu、Yuki Fukui、Ping Tian、Zhi-Tao He、Cai-Yun Sun、Nuo-Yi Wu、Guo-Qiang Lin
DOI:10.1021/ja404593c
日期:2013.8.14
The first Cu-catalyzed asymmetric borylative cyclization of cyclohexadienone-containing 1,6-enynes is achieved through a tandem process: selective beta-borylation of propargylic ether and subsequent conjugate addition to cyclohexadienone. The reaction proceeds with excellent regioselectivity and enantioselectivity to afford an optically pure cis-hydrobenzofuran framework bearing alkenylboronate and enone substructures. Furthermore, the resulting bicyclic products could be converted to bridged and tricyclic ring structures. This method extends the realm of Cu-catalyzed asymmetric tandem reactions using bis(pinacolato)diboron (B(2)pin(2)).
Thiourea‐Promoted Cascade Dihalogenation‐Cyclization of Cyclohexadienone‐Containing 1,6‐Enynes
AbstractOrganohalogens play an important role in the drug discovery and functional materials. However, the convenient preparation of organohalogens still remains a challenging task. Herein, we report a metal‐free cascade dihalogenation‐cyclization of cyclohexadienone‐containing 1,6‐enynes in a biodegradable solvent to generate the dibrominated cis‐tetrahydrobenzofuran‐5(4H)‐ones and cis‐dihydrobenzopyran‐6(5H)‐ones respectively bearing 1,4‐dibromobut‐1‐enyl subunit in trans‐trans and trans‐cis form. A subgram‐scale experiment and several downstream transformations are presented for elaborating the synthetic utility. Moreover, the potent anticancer activity is observed against MDA‐MB‐468 cells for the corresponding products.magnified image