A highly efficient heterogeneous copper-catalyzed Chan-Lam coupling between thiols and arylboronic acids leading to diaryl sulfides under mild conditions
作者:Yang Lin、Mingzhong Cai、Zhiqiang Fang、Hong Zhao
DOI:10.1016/j.tet.2016.04.063
日期:2016.6
coupling reaction between thiols and arylboronicacids was achieved in EtOH at room temperature in the presence of 5 mol % of MCM-41-immobilized 1,10-phenanthroline-copper(II) complex [MCM-41-1,10-Phen-CuSO4] with n-Bu4NOH (40% aq) as base under O2 atmosphere, yielding a variety of unsymmetrical diaryl sulfides in good to excellent yields under mild and green conditions. The new heterogeneous copper complex
Nano-CuFe2O4 as a magnetically separable and reusable catalyst for the synthesis of diaryl/aryl alkyl sulfides via cross-coupling process under ligand-free conditions
good chemoselectivity and functional group tolerance in the presence of a catalytic amount of CuFe2O4, Cs2CO3 as base, in nitrogen atmosphere, underligand-freeconditions, in DMSO as solvent at 100 °C. The catalyst is air-stable, inexpensive, magnetically separable and recyclable up to four cycles.
为在芳基卤化物和硫醇/二硫键之间形成CuFe 2 O 4纳米粉催化的芳基-硫键的形成开发了一种有效的方案。在氮气氛下,无配体条件下,在催化量的CuFe 2 O 4,Cs 2 CO 3为碱的存在下,以令人印象深刻的产率,良好的化学选择性和官能团耐受性合成了多种芳基硫化物。二甲基亚砜在100°C下用作溶剂。该催化剂是空气稳定的,便宜的,可磁分离的并且可循环使用多达四个循环。
Nano Indium Oxide as a Recyclable Catalyst for C−S Cross-Coupling of Thiols with Aryl Halides under Ligand Free conditions
An efficient ligand-free C−S cross-coupling of aryl halides with aromatic/alkyl thiols has been developed using a catalytic amount of nanocrystalline indium oxide as a recyclable catalyst with KOH as the base in DMSO at 135 °C. A variety of aryl sulfides can be synthesized in excellent yields utilizing this protocol.
A method for Ni-catalyzed controlled decarbonylation of α-ketothioesters is described. Mono- and double-decarbonylations, which gave thioesters and thioethers, respectively, were selectively achieved by changing the ligand. A fundamental study of Ni-catalyzed decarbonylation of α-ketothioesters is presented.