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Synthesis 2011(6): 961-971  
DOI: 10.1055/s-0030-1258424
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Synthesis of Catalytically Active Ruthenium Complexes with a Remote Chiral Lactam as Hydrogen-Bonding Motif

Felix Voss, Florian Vogt, Eberhardt Herdtweck, Thorsten Bach*
Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstr. 4, 85747 Garching, Germany
Fax: +49(89)28913315; e-Mail: thorsten.bach@ch.tum.de;
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Publikationsverlauf

Received 7 January 2011
Publikationsdatum:
08. Februar 2011 (online)

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Abstract

A terminal alkyne was prepared, which is linked by a carbon-carbon bond to a conformationally restricted, U-shaped chiral lactam, that is, more precisely, to carbon atom C7 of 1,5,7-trimethyl-3-azabicyclo[3.3.1]nonan-2-one. The alkyne was connected to various ligands (bipyridine, terpyridine, pybox) by Sonogashira cross-coupling with the respective bromides or triflates. The resulting products were converted into four defined ruthenium complexes (58-94% yield). The complexes contain a catalytically active metal center, which is spatially remote from the hydrogen-bonding motif of the chiral lactam. Preliminary experiments with one of these complexes proved that the complex shows catalytic activity in oxidation reactions and that enantioselectivity is achieved due to substrate coordination to the chiral lactam.

Key words

supramolecular chemistry - hydrogen bonds - catalysis - coordination chemistry - cross-coupling reactions

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1

Current address: Novartis Pharma AG, Novartis Campus, 4056 Basel, Switzerland.

2

Current address: Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.