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Efficient palladium-catalyzed Heck reactions mediated by the diol-functionalized imidazolium ionic liquids

机译:二醇官能化咪唑鎓离子液体介导的高效钯催化的Heck反应

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摘要

The diol-functionalized imidazolium ionic liquids, 1-(2,3-dihydroxypropyl)-3-methylimidazolium hexa-fluorophosphate (1) and 2,2-bis(1-methyl-methylimidazolium) propane-1,3-diol hexafluorophosphate (2), were synthesized and used as the phosphine-free ligands in the palladium-catalyzed Heck reaction of aryl bromides with electron-deficient olefins. Under aerobic conditions, the efficient arylation of acry-lates could be accomplished when catalyzed by PdCl2-2 (or 1) in DMF with Et3N as a base, in terms of good activities, excellent selectivities (to trans-coupling products), and reusability, due to the available multiple coordinating sites like bidentate diol and NHC carbene in the ligands.
机译:二醇官能化的咪唑鎓离子液体,1-(2,3-二羟丙基)-3-甲基咪唑六氟磷酸盐(1)和2,2-双(1-甲基-甲基咪唑鎓)丙烷-1,3-二醇六氟磷酸盐(2 )合成,并用作芳族溴化物与缺电子烯烃的钯催化的Heck反应中的无膦配体。在好氧条件下,当Dd中的PdCl2-2(或1)以Et3N为基础时,就其良好的活性,优异的选择性(对偶合产物的选择性)和可重复使用性而言,可以实现丙烯酸酯的有效芳基化。 ,因为在配体中有多个可用的配位点,如双齿二醇和NHC卡宾。

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