Effect of modifier structure in asymmetric 1-phenylpropane-1,2-dione hydrogenation

I Busygin, E Toukoniitty, Reko Leino, Dmitry Murzin

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25 Citations (Scopus)


Sixteen chiral catalyst modifiers including the natural cinchona alkaloids cinchonidine, cinchonine and quinine together with their several analogues were studied in the hydrogenation of 1-phenylpropane-1,2-dione over a 5% Pt/Al(2)O(3) catalyst at 10 bar H(2) and 15 degrees C. The influence of the different functional parts of the cinchona alkaloid on the reaction rate, enantio and regioselectivity and diol distribution was investigated. The modifier hydroxyl group in C-9 position is crucial for achieving high enantioselectivity. Replacement of the 9-OH group with a methyl ether results in a complete loss of enantioselectivity for cinchonidine and quinine, whereas an inversion of enantioselectivity was observed for the cinchonine-based modifiers. The role of the absolute configuration at C-8 and -9, the bicyclic quinuclidine part and aromatic system of the cinchona alkaloid on the reaction kinetics was studied as well. Acetic acid is detrimental for enantioselectivity in the hydrogenation of 1-phenylpropane-1,2-dione to the corresponding hydroxyketones whereas in the second hydrogenation step from hydroxyketones to diols, high enantiomeric excesses are observed. The results obtained demonstrate the principal dissimilarity in the enantiodifferentiating mechanism between the well-investigated a-keto esters and vicinal diketones. (c) 2005 Elsevier B.V. All rights reserved.
Original languageUndefined/Unknown
Pages (from-to)227–238
Number of pages12
JournalJournal of Molecular Catalysis A: Chemical
Issue number1-2
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed


  • 1-phenylpropane-1,2-dione
  • chiral modifiers
  • cinchonidine
  • enantioselective hydrogenation
  • platinum catalyst

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