Iridium phosphine abnormal N-heterocyclic carbene complexes in catalytic hydrogen transfer reactions
作者:Xue Gong、Hong Zhang、Xingwei Li
DOI:10.1016/j.tetlet.2011.08.058
日期:2011.10
active catalysts for transfer hydrogenation of ketones or enones, dehydrative C–C coupling between primary and secondary alcohols, and dehydrogenation of benzyl alcohol to benzyl benzoate. In the transfer hydrogenation of acetophenone, abnormal NHC complexes give higher activity than a normal analogue. Dehydrative C–C coupling reactions between primary and secondary alcohols result in β-alkylation of the
几种带有螯合异常N-杂环卡宾(NHC)的铱配合物被证明是转移酮或烯酮氢化,伯醇和仲醇之间的脱水C-C偶联以及苯甲醇脱氢为苯甲酸苄酯的活性催化剂。在苯乙酮的转移氢化中,异常的NHC复合物比正常的类似物具有更高的活性。伯醇和仲醇之间的脱水CC偶联反应导致仲醇的β-烷基化,使用伯醇作为表观烷基化试剂,并且此类反应以高收率和选择性进行。已知这些催化方法涉及金属介导的从醇中临时借入氢和随后将氢传递至C C和/或C O键。