Highly Enantioselective Rhodium-Catalyzed Cross-Addition of Silylacetylenes to Cyclohexadienone-Tethered Internal Alkynes
作者:Chang-Lin Duan、Yun-Xuan Tan、Jun-Li Zhang、Shiping Yang、Han-Qing Dong、Ping Tian、Guo-Qiang Lin
DOI:10.1021/acs.orglett.9b00249
日期:2019.3.15
The first highlyenantioselective rhodium-catalyzed cross-addition of silylacetylenes to cyclohexadienone-tethered internal alkynes has been achieved via a tandem process: regioselective alkynylation of the internal alkynes and subsequent intramolecular conjugateaddition to the cyclohexadienones, affording the cis-hydrobenzofuran frameworks with good yields (up to 88% yield) and excellent enantioselectivities
Rhodium-catalyzedasymmetric desymmetrization Pauson–Khandreaction of C4-alkynyl-tethered cyclohexadienones has been developed as a novel strategy for access to fused 6–5–5 tricycles bearing three consecutive stereogenic centers. An array of chiral tricyclo[6.2.1.04,11]undecenes have been synthesized in high yields and enantioselectivities in a single step under mild conditions. This strategy employs
Ruthenium and Iodine Anion Cocatalyzed Cascade Dihalogenation and Cyclization of Internal Alkyne-Tethered Cyclohexadienones with 1,2-Dihaloethanes
作者:Xiaoli Huang、Cui Yi、Meiqi Bai、Yuhai Tang、Silong Xu、Yang Li
DOI:10.1021/acs.joc.4c00951
日期:2024.7.5
efficient ruthenium(II) and iodine anion cocatalyzed dihalogenation and cascade cyclization of internal alkyne-tethered cyclohexadienones, which stereoselectively afforded numerous dihalogenation products with a bioactive hydrobenzofuran skeleton in high yields under mild conditions. In this transformation, the reaction pathway was determined by the concentration of electrophilic iodine reagent, which also
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。