rhodium(I)-BINAP-catalyzed highlyenantioselective [2+2+2] cycloaddition of enynes with alkynes has been developed. Diverse fused tricyclic hydronaphthofuran scaffolds with three consecutive stereogenic centers were constructed in onestep from easily available materials with excellent chemo-, regio-, diastereo-, and enantioselectivity. Notable features of these reactions include 100 % atom economy
Palladium-catalyzed desymmetric [2+2+2] cycloaddition of 1,6-enyne and alkyne
作者:Wei-Cheng Zhao、Xin Wang、Juhua Feng、Ping Tian、Zhi-Tao He
DOI:10.1016/j.tet.2020.131862
日期:2021.1
desymmetric [2+2+2] cycloaddition reaction of alkyne-tethered cyclohexadienone and internal alkyne is established. Widely existing fused tricyclic hydronaphthofuran and hydronaphthopyrrole frameworks are prepared diastereoselectively in moderate to excellent yields. One-step aromatization process provides a new and facile access to important benzene-containing tricycles from above cycloaddition products
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)).