Lipase-catalyzed chemoselective ester hydrolysis of biomimetically coupled aryls for the synthesis of unsymmetric biphenyl esters

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Ehlert, J.; Kronemann, J.; Zumbrägel, N.; Preller, M.: Lipase-catalyzed chemoselective ester hydrolysis of biomimetically coupled aryls for the synthesis of unsymmetric biphenyl esters. In: Molecules 24 (2019), Nr. 23, 4272. DOI: https://doi.org/10.3390/molecules24234272

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Abstract: 
Lipases are among the most frequently used biocatalysts in organic synthesis, allowing numerous environmentally friendly and inexpensive chemical transformations. Here, we present a biomimetic strategy based on iron(III)-catalyzed oxidative coupling and selective ester monohydrolysis using lipases for the synthesis of unsymmetric biphenyl-based esters under mild conditions. The diverse class of biphenyl esters is of pharmaceutical and technical relevance. We explored the potency of a series of nine different lipases of bacterial, fungal, and mammalian origin on their catalytic activities to cleave biphenyl esters, and optimized the reaction conditions, in terms of reaction time, temperature, pH, organic solvent, and water-organic solvent ratios, to improve the chemoselectivity, and hence control the ratio of unsymmetric versus symmetric products. Elevated temperature and increased DMSO content led to an almost exclusive monohydrolysis by the four lipases Candida rugosa lipase (CRL), Mucor miehei lipase (MML), Rhizopus niveus lipase (RNL), and Pseudomonas fluorescens lipase (PFL). The study was complemented by in silico binding predictions to rationalize the observed differences in effcacies of the lipases to convert biphenyl esters. The optimized reaction conditions were transferred to the preparative scale with high yields, underlining the potential of the presented biomimetic approach as an alternative strategy to the commonly used transition metal-based strategies for the synthesis of diverse biphenyl esters.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2019
Appears in Collections:Forschungszentren

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pos. country downloads
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1 image of flag of Germany Germany 44 58.67%
2 image of flag of United States United States 17 22.67%
3 image of flag of No geo information available No geo information available 4 5.33%
4 image of flag of China China 3 4.00%
5 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 2 2.67%
6 image of flag of Taiwan Taiwan 1 1.33%
7 image of flag of Greece Greece 1 1.33%
8 image of flag of Ghana Ghana 1 1.33%
9 image of flag of France France 1 1.33%
10 image of flag of Czech Republic Czech Republic 1 1.33%

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