Cyclopentyl Methyl Ether: An Alternative Solvent for Palladium-Catalyzed Direct Arylation of Heteroaromatics
作者:Kassem Beydoun、Henri Doucet
DOI:10.1002/cssc.201000405
日期:2011.4.18
Some ethers, such as cyclopentyl methyl ether and di‐n‐butyl ether, which can be considered as “greener” solvents than N,N‐dimethylacetamide (DMAc) or DMF, can be advantageously employed for the palladium‐catalyzed direct arylation of heteroaromatics. In the presence of such ethers and only 0.5–1 mol % of palladium catalysts at 125–150 °C, the direct 5‐arylation of thiazoles, thiophenes, or furans
某些醚,例如环戊基甲基醚和二正丁基醚,可以被认为是比N,N-二甲基乙酰胺(DMAc)或DMF更“绿色”的溶剂,可有利地用于钯催化的杂芳族化合物的直接芳基化。在125-150°C的条件下,在存在此类醚和仅0.5-1 mol%的钯催化剂的情况下,通过使用芳基溴化物作为偶联伙伴,噻唑,噻吩或呋喃的直接5-芳基化反应将以中等至高收率进行。