Highly Active Metal??Free Catalysts for Hydrogenation of Unsaturated Nitrogen??Containing Compounds

V Sumerin, K Chernichenko, M Nieger…

Index: Sumerin, Victor; Chernichenko, Konstantin; Nieger, Martin; Leskelae, Markku; Rieger, Bernhard; Repo, Timo Advanced Synthesis and Catalysis, 2011 , vol. 353, # 11-12 p. 2093 - 2110

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Citation Number: 94

Abstract

Abstract New highly active ansa-ammonium borate catalysts for the direct metal-free hydrogenation of imines were prepared by tuning of the basicity and steric bulkiness of their amine moieties. The highest catalytic activity among previously reported organocatalytic systems was shown for a wide range of nitrogen-containing substrates. The first example of asymmetric imine hydrogenation based on the ansa-ammonium borate concept was ...