Selenide Ions as Catalysts for Homo- and Crossed-Tishchenko Reactions of Expanded Scope
摘要:
Selenide ions have been shown to catalyze the Tishchenko reaction for the first time. These catalysts are superior to previously reported thiolate analogues and promote the disproportionation of aldehydes with increased reaction rates and broader scope at lower catalyst loadings and temperatures. Significantly improved catalyst performance was also observed in the aryl selenide mediated crossed intermolecular Tishchenko reaction.
Direct α-arylchalcogenation of acetone with diaryl dichalcogenides has been achieved by using a mixture of TBHP and DTBP oxidants at 120 °C without transition-metal catalyst via oxidativeC(sp3)–Hbond functionalization. The method exhibits good functional group tolerance and products were isolated in moderate to high yields.
Ruthenium Catalyzed C–H Selenylations of Aryl Acetic Amides and Esters via Weak Coordination
作者:Zhengyun Weng、Xinyue Fang、Meicui He、Linghui Gu、Jiafu Lin、Zheyu Li、Wenbo Ma
DOI:10.1021/acs.orglett.9b02196
日期:2019.8.16
An efficient ruthenium-catalyzed direct C–H selenylation of aryl acetic amides and esters has been achieved via distal weakly coordination. Notable features of this protocol including broad substrate scope, wide functional group tolerance, and good regioselectivity. In addition, diaryl disulfides were also successfully applied to this reaction under slightly modified conditions.
Organoselenium compounds from purines: Synthesis of 6-arylselanylpurines with antioxidant and anticholinesterase activities and memory improvement effect
作者:Luis Fernando B. Duarte、Renata L. Oliveira、Karline C. Rodrigues、Guilherme T. Voss、Benhur Godoi、Ricardo F. Schumacher、Gelson Perin、Ethel A. Wilhelm、Cristiane Luchese、Diego Alves
DOI:10.1016/j.bmc.2017.11.019
日期:2017.12
We describe here a simple method for the synthesis of 6-arylselanylpurines with antioxidant and anticholinesteraseactivities, and memory improvement effect. This class of compounds was synthesized in good yields by a reaction of 6-chloropurine with diaryl diselenides using NaBH4 as reducing agent and PEG-400 as solvent. Furthermore, the synthesized compounds were evaluated for their in vitro antioxidant
Glycerol as a promoting medium for cross-coupling reactions of diaryl diselenides with vinyl bromides
作者:Loren C. Gonçalves、Gabriela F. Fiss、Gelson Perin、Diego Alves、Raquel G. Jacob、Eder J. Lenardão
DOI:10.1016/j.tetlet.2010.10.107
日期:2010.12
herein the use of glycerol as a novel solvent in the cross-coupling reaction of diaryl diselenides with vinyl bromides catalyzed by CuI. This cross-coupling reaction was performed with diaryl diselenides and (Z)- or (E)-vinyl bromides bearing electron-withdrawing and electron-donating groups, affording the corresponding vinyl selenides in good to excellent yields. The mixture glycerol/catalyst can be
Atom-economical selenation of electron-rich arenes and phosphonates with molecular oxygen at room temperature
作者:Samir Kumar Bhunia、Pritha Das、Ranjan Jana
DOI:10.1039/c8ob02792g
日期:——
An environmentally benign selenation of electron-rich arenes and phosphonates is developed adopting a novel recycle–reuse–reduce strategy for selenol by oxygen.