Development of a general copper-catalyzed vinylic Finkelstein reaction—application to the synthesis of the C1–C9 fragment of laingolide B
作者:Antoine Nitelet、Kévin Jouvin、Gwilherm Evano
DOI:10.1016/j.tet.2016.07.018
日期:2016.10
conditions compatible with a range of highly functionalized substrates. The potential of this vinylic halogen exchange reaction in total synthesis and medicinal chemistry was demonstrated by its successful use for the synthesis of the C1–C9 fragment of laingolide B and for the late-stage modification of drug-like molecules. The extension of this halogen exchange to the acetylenic and allenic Finkelstein
A General Copper-Catalyzed Vinylic Halogen Exchange Reaction
作者:Antoine Nitelet、Gwilherm Evano
DOI:10.1021/acs.orglett.6b00678
日期:2016.4.15
An efficient and general system for the halogen exchange reaction in alkenyl halides has been developed. Upon reaction with catalytic amounts of copper iodide and trans-N,N′-dimethylcyclohexane-1,2-diamine in the presence of tetramethylammonium chloride or bromide, a wide range of easily accessible alkenyl iodides can be smoothly transformed to their far less available chlorinated and brominated derivatives
An efficient and stereoselective procedure for the preparation of E-1-alkenylphosphonates by copper-mediated cross-coupling between 1,1-dibromo-1-alkenes and dialkyl phosphites is reported. The reaction allows for formal substitution of both bromine atoms, respectively, by an hydrogen and a dialkoxyphosphoryl.
Copper-Mediated Selective Cross-Coupling of 1,1-Dibromo-1-alkenes and Heteronucleophiles: Development of General Routes to Heterosubstituted Alkynes and Alkenes
site-selective, double, or alkynylative cross-coupling, therefore providing divergent and straightforward entries to numerous building blocks such as bromoenamides, ynamides, ketene N,N-acetals, bromoenol ethers, ynol ethers, keteneO,O-acetals, or vinylphosphonates and further expanding the copper catalysis toolbox with useful and versatile processes.
polyketide natural products anguinomycinC and D is reported based on key steps such as Negishi stereoinversion cross coupling, Jacobsen Cr(III)-catalyzed Hetero Diels-Alder reaction, Evans B-mediated syn-aldol chemistry, and B-alkyl Suzuki-Miyaura cross coupling. The configuration of both natural products was established as (5R,10R,16R,18S,19R,20S). Biologicalevaluation demonstrated that these natural
基于 Negishi 立体反转交叉偶联、Jacobsen Cr(III)-催化的 Hetero Diels-Alder 反应、Evans B 介导的 Syn-aldol 化学和 B-烷基等关键步骤,报道了聚酮化合物天然产物 Anguinomycin C 和 D 的制备铃木-宫浦交叉联轴器。两种天然产物的构型均建立为(5R、10R、16R、18S、19R、20S)。生物学评估表明,这些天然产物是核输出受体 CRM1 的抑制剂,导致 CRM1 介导的核蛋白输出在浓度高于 10 nM 时关闭。已经制备了 Anguinomycin 和 Leptomycin B (LMB) 的类似物,具有截短聚酮链的简单 α,β-不饱和内酯类似物 4 保留了大部分生物活性(抑制高于 25 nM)。