Impact of Solvent and Their Contaminants on Pd/C Catalyzed Suzuki-Miyaura Cross-Coupling Reactions

被引：1
|
作者：
de Lambert de Boisjan, Alexandre [1 ]
Allemann, Christophe [1 ]
Fadini, Luca [2 ]
机构：
[1] Univ Appl Sci Western Switzerland, HES SO, Bd Peroles 80, CH-1700 Fribourg, Switzerland
[2] Helsinn Adv Synth, Via Ind 24, CH-6710 Biasca, Switzerland
来源：
HELVETICA CHIMICA ACTA | 2021年 / 104卷 / 06期
关键词：
cross-coupling; palladium on charcoal; poisoning; solvent effects; solvent contaminants; Suzuki-Miyaura; CYCLOPENTYL METHYL-ETHER; BOND FORMATION; PALLADIUM; MECHANISMS; CHARCOAL; HECK;
D O I：
10.1002/hlca.202100035
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The aim of this work was to understand if solvent contaminants can interfere in Suzuki's cross-coupling reactions and if it can explain the lack of robustness in industrial processes. For this purpose, several parameters were tested on the industrial model reaction between 2-bromonaphthalene and phenylboronic acid catalyzed by Pd/C. Best results were obtained using THF as solvent. Traces of the precursors of the used solvents, such as 2,3-dihydrofurane or maleic anhydride (100-300 ppm related to the solvent) strongly poisoned the reaction, decreasing the conversion significantly. This means that to ensure robust production, solvent quality must be analyzed at the ppm level. Fortunately, addition of triphenylphosphine can circumvent the catalyst poisoning.
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页数：11
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