Tandem Suzuki-Miyaura Cross-Coupling/Dehydrobromination of 1,1-Dibromoalkenes to Alkynes with a Cyclobutene-1,2-diylbis(imidazolium) Salt as Catalyst Precursor
作者:Andreas Schmidt、Alireza Rahimi
DOI:10.1055/s-0029-1218848
日期:2010.8
A cyclobutene-1,2-bis(imidazolium) salt proved to be an efficient catalyst precursor for one-pot tandem Suzuki-Miyaura/dehydrobromination reactions for the synthesis of alkynes starting from 1,1-dibromoalkenes and palladium(II) acetate, aryl boronic acids, and potassium tert-butoxide in toluene. Starting materials were prepared from aldehydes under Corey-Fuchs conditions.
Aqueous-Phase, Palladium-Catalyzed Cross-Coupling of Aryl Bromides under Mild Conditions, Using Water-Soluble, Sterically Demanding Alkylphosphines
作者:Rebecca B. DeVasher、Lucas R. Moore、Kevin H. Shaughnessy
DOI:10.1021/jo048910c
日期:2004.11.1
yields without using organic solvents for the reaction or purification. This methodology has been applied to a highly efficient synthesis of diflunisal. The catalyst derived from t-Bu-Amphos was recycled three times in Suzuki couplings in water/toluene before catalyst activity began to significantly drop. The average yield of four cycles was >80% per cycle. Heck and Sonogashiracouplings were carried
Acyclic diaminocarbenes: simple, versatile ligands for cross-coupling reactions
作者:Bhartesh Dhudshia、Avinash N. Thadani
DOI:10.1039/b516398f
日期:——
Acyclic diaminocarbenes are found to be useful ligands for palladium catalyzed Suzuki–Miyaura, Sonogashira and Heck cross-coupling reactions of aryl/alkenyl bromides and chlorides.
Continuous Flow Sonogashira C–C Coupling Using a Heterogeneous Palladium–Copper Dual Reactor
作者:Li-Min Tan、Zhi-Yu Sem、Wei-Yuan Chong、Xiaoqian Liu、Hendra、Wei Lek Kwan、Chi-Lik Ken Lee
DOI:10.1021/ol303046e
日期:2013.1.4
We report the development of a heterogeneous catalyst system on continuousflow chemistry. A palladium (Pd) coated tubular reactor was placed in line with copper (Cu) tubing using a continuousflow platform, and a Sonogashira C–C coupling reaction was used to evaluate the performance. The reactions were favorably carried out in the Cu reactor, catalyzed by the traces of leached Pd from the Pd reactor