使用新的 (PCN)Ir 配合物作为预催化剂和t BuNH 2作为助催化剂,开发了以乙醇为氢源的 1,3-烯炔的反式半氢化反应。该催化剂体系以高产率和立体选择性提供了一种高效且原子经济地获得不对称 ( E , E )-1,4-二芳基丁二烯的途径。监测过程显示,1,3-烯炔的三键顺式半氢化(形成 ( E , Z )-丁二烯)和 ( E , Z ) 到-( E , E ) 异构化形成( , _E )-丁二烯。
Dual Photoredox/Nickel-Catalyzed 1,4-Sulfonylarylation of 1,3-Enynes with Sulfinate Salts and Aryl Halides: Entry into Tetrasubstituted Allenes
作者:Ting Xu、Shuang Wu、Quan-Na Zhang、You Wu、Ming Hu、Jin-Heng Li
DOI:10.1021/acs.orglett.1c03179
日期:2021.11.5
A radical-mediated three-component 1,4-sulfonylarylation of 1,3-enynes with aryl iodides and sulfinate salts using cooperativephotoredox/nickelcatalysis is described. This protocol enables the synthesis of tetrasubstituted sulfonyl-containing allenes under redox-neutral conditions and provides a versatile 1,3-enyne 1,4-difunctionalization platform for the synthesis of a diverse range of tetrasubstituted
Oxidative three-component 1,2-alkylarylation of alkenes with alkyl nitriles and N-heteroarenes
作者:Xuan-Hui Ouyang、Ming Hu、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/c8cc06509h
日期:——
An indium-promoted intermolecular oxidative 1,2-alkylarylation of alkenes with alkylnitriles and N-heteroarenes enabled by C(sp3)–H/C(sp2)–Hfunctionalization is presented. This oxidative radical strategy allows the formation of two new C–C bonds through transformations of two different C–H bonds across the alkenes in a controlled single-step manner, and offers a general, highly atom-economic route
提出了通过C(sp 3)–H / C(sp 2)–H官能化作用实现的烯烃与烷基腈和N-杂芳烃的铟促进的分子间氧化1,2-烷基芳基化反应。这种氧化自由基策略允许通过可控的单步方式,通过烯烃上两个不同的C–H键的转变形成两个新的C–C键,并为生产新的功能化化合物提供了一条通用的,高度原子经济的途径N-杂芳烃,包括吲哚,吡咯并[2,3- b ]吡啶,吡咯并[3,2,1- ij ]喹诺酮和吡咯。
First total synthesis of antrocamphin A and its analogs as anti-inflammatory and anti-platelet aggregation agents
Naturally occurring antrocamphin A (1) is a potent anti-inflammatory compound from the edible fungus Antrodia camphorata (Taiwanofungus camphoratus), whose wild fruiting body is used as a valuable folk medicine in Taiwan. This study is the first total synthesis of antrocamphin A (1) and its analogs. Their inhibition ability on NO release, superoxide anion generation, elastase release and platelet aggregation are reported herein.
Nickel‐Catalyzed Carbofluoroalkylation of 1,3‐Enynes to Access Structurally Diverse Fluoroalkylated Allenes
作者:Kai‐Fan Zhang、Kang‐Jie Bian、Chao Li、Jie Sheng、Yan Li、Xi‐Sheng Wang
DOI:10.1002/anie.201813184
日期:2019.4
A nickel‐catalyzed 1,4‐carbofluoroalkylation of 1,3‐enynes to access structurally diverse fluoroalkylated allenes has been established. This method has demonstrated high catalytic reactivity, mild reaction conditions, broad substrate scope, and excellent functional‐group tolerance. The key to success is the use of a nickel catalyst to generate different fluoroalkyl radicals from readily available and
Beyond the Limits: Palladium-N-Heterocyclic Carbene-Based Catalytic System Enables Highly Efficient [4+2] Benzannulation Reactions
作者:Olga V. Zatolochnaya、Alexey V. Galenko、Vladimir Gevorgyan
DOI:10.1002/adsc.201100983
日期:2012.4.16
A highlyefficientcatalyticsystem for the palladium‐catalyzed [4+2] benzannulationreaction of enynes and enynophiles has been developed. The use of an N‐heterocyclic carbene‐based palladium precursor allowed us to achieve turnover numbers up to 1800. The new catalyticsystem has enabled an expansion of the scope of the [4+2] homo‐benzannulationreaction.