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.
A Radical Addition/Cyclization and Se‐Group Transfer Strategy for the Facile Synthesis of Se‐Containing Cyclopentenes under Metal‐Free and Peroxide‐Free Conditions
作者:Dian‐Liang Wang、Nan‐Quan Jiang、Zhong‐Jian Cai、Shun‐Jun Ji
DOI:10.1002/chem.202103334
日期:2021.12.20
A highly atom-economic intermolecular radicaladdition/cyclization and Se-group transfer strategy was developed for the efficient synthesis of Se-containing cyclopentenes under metal-free and peroxide-free conditions.
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.
一种采用新颖的循环-重复利用-减少策略,通过氧气对富电子芳烃和膦酸酯进行环保的硒化反应被开发出来。
Copper-Catalyzed Synthesis of Unsymmetrical Diorganyl Chalcogenides (Te/Se/S) from Boronic Acids under Solvent-Free Conditions
The efficient and mild copper-catalyzed synthesis of unsymmetrical diorganyl chalcogenides under ligand- and solvent-free conditions is described. The cross-coupling reaction was performed using aryl boric acids and 0.5 equiv. of diorganyl dichalcogenides (Te/Se/S) in the presence of 3 mol % of CuI and 3 equiv. of DMSO, under microwave irradiation. This new protocol allowed the preparation of several