Samarium Diiodide-Induced Reduction of Amorphous Selenium: A Facile Synthesis of Diaryl Diselenides
摘要:
Samarium diiodide reduces amorphous selenium to Se-2(2-) in THF. Subsequent addition of aryldiazonium fluoborates affords diaryl diselenides in moderate to good yields.
New synthetic methods : sodium alkanechalcogenates as demethylating agents. Scope, limitation and new one-pot synthesis of diaryldiselenides.
作者:Michel Evers、Léon Christiaens
DOI:10.1016/s0040-4039(00)81412-4
日期:——
Sodium alkanechalcogenates (S, Se) cleave the alkylarylchalcogenides (O, S, Se). The versatility of such reagents is developed and applied to a newsynthesis of diaryldiselenides.
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
A new protocol was developed to synthesize (enantioenriched) thioethers and selenoethersfrom (chiral) benzylic trimethylammonium salts and di(hetero)aryl disulfides or diselenides. These syntheses were promoted by the presence of weak base and did not require the use of any transition metal, and resulted in the target products with good to excellent yields (72–94%). Using quaternary ammonium salts