Zinc-promoted umpolung thiolation of alkyl electrophiles with masked sulfur transfer reagents in the absence of nickel or copper catalysis is described. This protocol proceeds via a SET process of Zn to electrophilic sulfur reagent followed by insertion of Zn into disulfide and nucleophilic thiolation, providing straightforward access to a wide range of alkyl sulfides with broad substrate scope. A
描述了在没有镍或铜催化的情况下,使用掩蔽硫转移试剂对烷基亲电子试剂进行锌促进的还原硫醇化。该方案通过Zn 与亲电硫试剂的 SET 过程进行,然后将 Zn 插入二硫化物和亲核硫醇化,从而可以直接获得具有广泛底物范围的各种烷基硫醚。合成、分离并通过 NMR、IR 和 X 射线分析充分表征了具有四面体几何形状的中性 TMEDA 连接的四配位硫醇锌。更重要的是,这种活性中间体的化学反应性已经得到研究,能够构建 C-Se、C-Te、Sb-S 和 Bi-S 键,以制备有价值的含硫分子等。
Synthesis of indoles through Rh(III)-catalyzed C–H cross-coupling with allyl carbonates
作者:Tian-Jun Gong、Wan-Min Cheng、Wei Su、Bin Xiao、Yao Fu
DOI:10.1016/j.tetlet.2013.11.065
日期:2014.3
A practical Rh-catalyzed reaction was developed to achieve 2-alkyl-substituted indole synthesis. The reaction can tolerate a variety of synthetically important functional groups. The indole products can also be transformed into other important skeletons. Two bioactive compounds, that is indomethacin and pravadoline were prepared using the new method. (C) 2014 Published by Elsevier Ltd.
Ni-Catalyzed Carboxylation of Unactivated Alkyl Chlorides with CO<sub>2</sub>
作者:Marino Börjesson、Toni Moragas、Ruben Martin
DOI:10.1021/jacs.6b04088
日期:2016.6.22
A catalytic carboxylation of unactivated primary, secondary, and tertiary alkylchlorides with CO2 at atmospheric pressure is described. This protocol represents the first intermolecular cross-electrophile coupling of unactivatedalkylchlorides, thus leading to new knowledge in the cross-coupling arena.
描述了未活化的伯、仲和叔烷基氯化物在大气压下与 CO2 的催化羧化。该协议代表了未活化烷基氯化物的第一个分子间交叉亲电偶联,从而导致交叉偶联领域的新知识。
Palladium-catalyzed monoselective C–H borylation of acetanilides under acidic conditions
作者:Bin Xiao、Yi-Ming Li、Zhao-Jing Liu、Han-Yi Yang、Yao Fu
DOI:10.1039/c2cc31737k
日期:——
A practical Pd-catalyzed reaction was developed to achieve CâH activation/CâB cross-coupling of acetanilides under acidic conditions. The new reaction shows a good functional group tolerance and an exclusive mono-selectivity. This CâH borylation method may provide a generally applicable route for the conversion of CâH moieties into many other types of bonds.