N-heterocyclic carbene–palladium(<scp>ii</scp>)-1-methylimidazole complex catalyzed α-arylation reactions of tetralones with aryl chlorides and further transformation of the products
作者:Hui-Ying Yin、Xia-Li Lin、Shu-Wan Li、Li-Xiong Shao
DOI:10.1039/c5ob01203a
日期:——
NHC–Pd(II)–Im complex 1 has proven to be an efficient catalyst in the reaction between tetralones 2 and aryl chlorides 3, giving the α-arylated tetralones 4 in good to high yields. In addition, if the above reaction mixture was exposed to air at room temperature for another 3 h, the normal α-arylated products 4 can be fully oxidized to 2-aryl-2′-hydroxytetralones 6 in good yields in a one-pot procedure
NHC-Pd(II)-Im配合物1被证明是四氢萘酮2和芳基氯3之间反应的有效催化剂,使α-芳基化四氢萘酮4的产率高至高。另外,如果上述反应混合物在室温下再暴露于空气中3小时,则正常的α-芳基化产物4可以一锅法以良好的产率被完全氧化为2-芳基-2'-羟基四氢萘酮6。 。此外,如果将含有氧化产物6的反应混合物在回流下用TsOH /甲苯溶液处理19 h,则最终的芳构化产物2-芳基萘-1-醇5可以以可接受到中等的产量实现。所有反应都能耐受四氢萘酮2和芳基氯3上的各种取代基,从而为四氢萘酮的α-芳基化和产物的进一步转化提供了一种有效的方法,并且丰富了NHC-Pd(II)配合物在有机合成中的应用。 。