2a–c) as N-heterocyclic carbene precursors have been synthesized and characterized. The incorporation of saturated N-heterocyclic carbenes into palladium precatalysts gives high-catalyst activity in the Heck coupling of aryl bromide substrates in aqueous media. The complexes were generated in the presence of Pd(OAc)2 by in situ deprotonation of 1,3-dialkylazolinium salts 1, 2. © 2008 Wiley Periodicals,
新型 1,3-二烷基
咪唑啉鎓、1,3-二烷基-3,4,5,6-四氢
嘧啶鎓和 1,3-二烷基-1H-4,5,6,7-四氢二氮杂鎓
六氟磷酸盐 (1a–c, 2a–c ) 作为 N-杂环卡宾前体的合成和表征。将饱和的 N-杂环卡宾掺入
钯预催化剂中,在
水介质中芳基
溴底物的 Heck 偶联中具有高催化剂活性。这些配合物是在 Pd(OAc)2 存在下通过 1,3-二烷基唑啉盐 1、2 的原位去质子化生成的。 © 2008 Wiley Periodicals, Inc. HeterOAtom Chem 19:82–86, 2008; 在线发表于 Wiley InterScience (www.interscience.wiley.com)。DOI 10.1002/hc.20415