N,S-chelating triazole-thioether ligand for highly efficient palladium-catalyzed Suzuki reaction
作者:Qiong Yan、Lei Zheng、Miaomiao Li、Yunfeng Chen
DOI:10.1016/j.jcat.2019.07.004
日期:2019.8
1,2,3-Triazole-thioether compounds could serve as efficient ligands for Pd-catalyzed Suzuki reactions of various aryl iodides, bromides and chlorides. The reactions feature wide substrate scope and mild reaction conditions. Besides, shorter reaction time, lower catalyst loadings and quantitative yields with a turnover-frequency (TOF) value of up to 11,880 h−1 are other advantageous of this attractive
1,2,3-三唑-硫醚化合物可以用作钯催化的各种芳基碘化物,溴化物和氯化物的Suzuki反应的有效配体。该反应具有广泛的底物范围和温和的反应条件。此外,更短的反应时间,更低的催化剂载量和定量产率(TOF)值高达11,880 h -1的定量收率是该引人注目的方案的其他优点。晶体结构分析和计算研究表明,相应的螯合钯配合物的较高催化活性归因于较低的能隙和较低的氧化还原电势。
Gold-catalyzed synthesis of 1,3-disubstituted benzenes through tandem allylation/cyclization reaction of alkynals
作者:Sabyasachi Bhunia、Shariar Md. Abu Sohel、Chao-Chin Yang、Shie-Fu Lush、Fwu-Ming Shen、Rai-Shung Liu
DOI:10.1016/j.jorganchem.2008.10.049
日期:2009.2
Treatment of alkynals with 2-substituted allylsilanes and PPh3AuCl/AgOTf (5/3 mol%) catalyst led to formation of 1,3-disubstituted benzenes efficiently. This reaction sequence comprises an initial allylation of aldehyde, followed by cycloisomerization of enynes; PPh3AuOTf is active in both steps.
One-Pot Double Suzuki−Miyaura Couplings: Rapid Access to Nonsymmetrical Tri(hetero)aryl Derivatives
作者:Floriane Beaumard、Philippe Dauban、Robert H. Dodd
DOI:10.1021/ol900358n
日期:2009.4.16
We describe a one-pot, simultaneous Suzuki−Miyaura cross-coupling of two different aryl boronic acids with symmetrical dibromo aryl and heterocyclic substrates to give as major products the unsymmetrical disubstituted tri(hetero)aryl derivatives. Yields of unsymmetrical dicoupled products were generally in the 52−75% range. This methodology is particularly suited to the generation of chemical libraries