Selective Carbonyl−C(sp<sup>3</sup>) Bond Cleavage To Construct Ynamides, Ynoates, and Ynones by Photoredox Catalysis
作者:Kunfang Jia、Yue Pan、Yiyun Chen
DOI:10.1002/anie.201611897
日期:2017.2.20
Carbon–carbonbondcleavage/functionalization is synthetically valuable, and selective carbonyl−C(sp3) bondcleavage/alkynylation presents a new perspective in constructing ynamides, ynoates, and ynones. Reported here is the first alkoxyl‐radical‐enabled carbonyl−C(sp3) bondcleavage/alkynylation reaction by photoredox catalysis. The use of novel cyclic iodine(III) reagents are essential for β‐carbonyl
An efficient protocol has been established for the synthesis of conjugated ynones via addition of terminalalkynes to aromatic nitriles, which is catalyzed by novel divalent lanthanide amide complexes. All the reactions gave the products in good to excellent yields at room temperature under solvent-free conditions without any additives. The novel lanthanide amide catalysts were also synthesized and
The reactions of neutral pyrrolyl-functionalized indole with rare-earth metal amides [(Me3Si)2N]3RE(µ-Cl)Li(THF)3 produced the rare-earth metal complexes [(Me3Si)2N]2RE([η1:µ-η2-3-(2-(N-CH3)C4H3NCH=N-CH2CH2)C8H5N])(µ-Cl)Li(THF) (RE = Er, Y) having indolyl ligand η1 bonded to rare-earth metal ion and η2 bonded to lithium ion. The catalytic activities of these lanthanide amido complexes for addition of terminal alkynes to aromatic nitriles were explored. Results reveal that these complexes displayed a good catalytic activity for the addition reaction under mild conditions.
中性吡咯基功能化的吲哚与稀土金属氨基[(Me3Si)2N]3RE(µ-Cl)Li(THF)3反应生成了稀土金属络合物[(Me3Si)2N]2RE([η1:µ-η2-3-(2-(N-CH3)C4H3NCH=N-CH2CH2)C8H5N])(µ-Cl)Li(THF) (RE = Er, Y),其中吲哚基配体η1与稀土金属离子结合,η2与锂离子结合。研究了这些锕系金属氨基络合物在温和条件下对末端炔烃与芳香硝基的加成反应的催化活性。结果显示,这些络合物在加成反应中表现出良好的催化活性。
Synthesis of Iron Oxide Palladium Nanoparticles and Their Catalytic Applications for Direct Coupling of Acyl Chlorides with Alkynes
作者:Rakesh K. Sharma、Manavi Yadav、Rashmi Gaur、Radhika Gupta、Alok Adholeya、Manoj B. Gawande
DOI:10.1002/cplu.201600321
日期:2016.12
plasma, FTIR spectroscopy, vibrating sample magnetometry, and atomic absorption spectroscopy. This nanocatalyst can be magnetically recovered and reused in multiple runs without any noticeable loss in catalytic activity.