Modulation of the reactivity, stability and substrate- and enantioselectivity of an epoxidation catalyst by noncovalent dynamic attachment of a receptor functionality - aspects on the mechanism of the Jacobsen-Katsuki epoxidation applied to a supramolecular system

Summary, in English

The synthesis of the components of the dynamic supramolecular hydrogen-bonded catalytic system 2 + 3 is described. The catalytic performance and substrate- and enantioselectivity of Mn(salen) catalyst 2 were investigated in the presence and absence of the Zn(porphyrin) receptor unit 3. The effects of pyridine and pyridine N-oxide donor ligands were also studied. Some aspects on the mechanism of the Jacobsen - Katsuki epoxidation, based on literature observations, are introduced as a means to analyse the behaviour of 2 and its modulation by the formation of macrocycle 1 with 3. A complete association model of the metal-free system 4 + 5 refutes the earlier assumption that macrocycle 1 is the predominant form of catalyst 2 under the standard epoxidation reaction conditions with 2 + 3. Evidence are provided that receptor-binding substrates and nonbinding substrates, respectively, are epoxidised by two different catalytic species, or two distinct distributions of species in competitive epoxidations using catalytic system 2 + 3. The two species are assigned to the endo and exo faces of the Mn( salen) catalyst in macrocycle 1, and to equivalently folded oligomeric structures with monomers 2 and 3 in adjacent positions.

• Author: Stefan Jonsson; Fabrice Odille; Per-Ola Norrby; Kenneth Wärnmark
• Department/s: Centre for Analysis and Synthesis
• Publishing year: 2006
• Language: English
• Pages: 1927-1948
• Publication/Series: Organic and Biomolecular Chemistry
• Volume: 4
• Issue: 10
• Links: http://dx.doi.org/10.1039/b518244a
• Document type: Journal article
• Publisher: Royal Society of Chemistry
• Topic: Organic Chemistry
• Status: Published
• ISBN/ISSN/Other: ISSN: 1477-0539