lancifodilactone G Gacetate的不对称全合成过程需要28个步骤。该合成的关键步骤包括:(i)用于形成BC环骨架的不对称Diels-Alder反应;(ii)使用Hoveyda-Grubbs II催化剂进行分子内闭环复分解反应以形成三取代的环辛烯;(iii)分子内的Pauson-Khand反应,用于构建空间拥挤的F环;(iv)顺序的交叉复分解,氢化和内酯化反应,以安装Lancifodilactone G的阴离子稳定的双螺缩酮片段;(v)用于安装A环的狄克曼型缩合反应。为全合成而开发的策略和化学方法将对其他天然产物和复杂分子的合成有用。
Chalcogen Bonding Catalysis of a Nitro‐Michael Reaction
作者:Patrick Wonner、Alexander Dreger、Lukas Vogel、Elric Engelage、Stefan M. Huber
DOI:10.1002/anie.201910639
日期:2019.11.18
Chalcogen bonding is the non-covalent interaction between Lewis acidic chalcogen substituents and Lewis bases. Herein, we present the first application of dicationic tellurium-based chalcogen bonddonors in the nitro-Michael reaction between trans-β-nitrostyrene and indoles. This also constitutes the first activation of nitro derivatives by chalcogen bonding (and halogenbonding). The catalysts showed
[EN] DIRECT OXIDATIVE AMINATION OF HYDROCARBONS<br/>[FR] AMINATION OXYDATIVE DIRECTE D'HYDROCARBURES
申请人:SCRIPPS RESEARCH INST
公开号:WO2019109045A1
公开(公告)日:2019-06-06
Provided is a process for converting a hydrocarbon comprising at least one C-H bond to a nitrogen-functionalized product. The process comprises contacting a hydrocarbon and (i) an oxidizing electrophile comprising (a) a main group element or transition metal in oxidized form and (b) at least one nitrogen-containing ligand, or (ii) an oxidant and a reduced form of an oxidizing electrophile comprising (a) a main group element or transition metal and (b) at least one nitrogen-containing ligand, in a solvent to provide the nitrogen-functionalized product and an electrophile reduction product. Further provided is an oxidizing composition comprising the oxidizing electrophile with at least one nitrogen-containing ligand and a non‑oxidizable liquid.