A Direct Synthesis of Selenophenes by Cu-Catalyzed One-Pot Addition of a Selenium Moiety to (E,E)-1,3-Dienyl Bromides and Subsequent Nucleophilic Cyclization
摘要:
An efficient protocol for the synthesis of selenophenes and selanyl selenophenes has been achieved by a simple one-pot reaction of 1,3-dienyl bromides and 1,3-dienyl-gem-dibromides respectively with KSeCN catalyzed by CuO nanoparticles. Several aryl, alkenyl, heteroaryl, and alkyl substituted selenophenes were obtained with a broad array of functional group tolerance. This is found to be a general methodology for chalcogenophenes being effective for the synthesis of thiophenes too.
Further studies on the utility of sodium hypochlorite in organic synthesis. Selective oxidation of diols and direct conversion of aldehydes to esters
作者:Robert V. Stevens、Kevin T. Chapman、Cheryl A. Stubbs、Weyton W. Tam、Kim F. Albizati
DOI:10.1016/s0040-4039(00)85677-4
日期:1982.1
Sodiumhypochlorite in acetic acid solution selectively oxidizes secondary alcohols to ketones in the presence of primary alcohols and converts aldehydes to methyl esters in the added presence of methanol.
在乙酸溶液中的次氯酸钠在伯醇存在下选择性地将仲醇氧化为酮,在甲醇存在下将醛转化为甲酯。
Integration of Earth-Abundant Photosensitizers and Catalysts in Metal–Organic Frameworks Enhances Photocatalytic Aerobic Oxidation
作者:Xuanyu Feng、Yunhong Pi、Yang Song、Ziwan Xu、Zhong Li、Wenbin Lin
DOI:10.1021/acscatal.0c05053
日期:2021.2.5
We report here the construction of two metal–organic frameworks (MOFs), Zr6-Cu/Fe-1 and Zr6-Cu/Fe-2, by integrating earth-abundant cuprous photosensitizers (Cu-PSs) and Fe catalysts for photocatalytic aerobic oxidation. Site isolation and pore confinement stabilize both Cu-PSs and Fe catalysts, while the proximity between active centers facilitates electron and mass transfer. Upon visible light irradiation
我们在这里报告了通过整合地球上大量的亚铜光敏剂(Cu-PSs)和用于光催化作用的铁催化剂,构造了两个金属有机骨架(MOF)Zr 6 -Cu / Fe-1和Zr 6 -Cu / Fe-2有氧氧化。部位隔离和孔隙限制可稳定Cu-PSs和Fe催化剂,而活性中心之间的邻近则促进电子和质量传递。在可见光照射下,使用O 2作为唯一氧化剂,Zr 6 -Cu / Fe-1和Zr 6 -Cu / Fe-2有效氧化醇和苄基化合物,得到相应的羰基产物,具有较宽的底物范围,高达500的高周转率,比同类类似物增强9.4倍,并且在连续四次运行中具有出色的可回收性。对照实验,光谱证据和计算研究揭示了光氧化机理:O 2对[Cu-PS] *的氧化猝灭提供了[Cu II -PS],该[Cu II -PS]有效地氧化了Fe III -OH以生成底物羟基氧化。这项工作凸显了MOF在促进地球上基于金属的光催化方面的潜力。
New one-pot synthesis of anti-tuberculosis compounds inspired on isoniazid
作者:Diego G. Ghiano、Alejandro Recio-Balsells、Ana Bortolotti、Lucas A. Defelipe、Adrián Turjanski、Héctor R. Morbidoni、Guillermo R. Labadie
DOI:10.1016/j.ejmech.2020.112699
日期:2020.12
Concentration ≤10 μM, of which the most active members (MIC of 1.25 μM) were exclusively E isomers. In order to validate the mechanism of action of the most active acrylates, we tested their activity on a M. tuberculosis InhA over-expressing strain obtaining MIC that consistently doubled those obtained on the wild type strain. Additionally, the binding mode of those analogs on M. tuberculosis InhA was investigated
Simple and expeditious pinacol coupling of non usual α,β-unsaturated carbonyl compounds in water
作者:Muriel Billamboz、Nicolas Sotto、Carole Chevrin-Villette、Christophe Len
DOI:10.1039/c5ra03870g
日期:——
Using zinc (0) in a 5% v AcOH aqueous solution allowed the efficient pinacolcoupling of aliphatic or aromatic unusual, α,β-unsaturated carbonylcompounds such as citral A in good to excellent yields (56–99%). It can also be successfully applied to acetophenone.
A regioselective synthesis of 2-tributylstannyl-1,3-dienes
作者:Cristina Nativi、Maurizio Taddei、Andrè Mann
DOI:10.1016/s0040-4039(00)95726-5
日期:1987.1
Hydrostannylation of 1-trimethylsilyl-4-hydroxy-2-alkyne derivatives followed by acetylation of the OH group and fluorideion-catalysed 1,4 elimination of the silyl and the acetate groups afforded 2-stannyl-1,3-dienes with high regio- and stereoselectivity.