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Stereochemistry of Chiral 2-Substituted Chromanes: Twist of the Dihydropyran Ring and Specific Optical Rotation. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28010439. [PMID: 36615631 PMCID: PMC9823451 DOI: 10.3390/molecules28010439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 12/27/2022] [Accepted: 12/28/2022] [Indexed: 01/06/2023]
Abstract
Chiral 2-substituted chromanes are important substructures in organic synthesis and appear in numerous natural products. Herein, the correlation between specific optical rotations (SORs) and the stereochemistry at C2 of chiral 2-substituted chromanes was investigated through data mining, quantum-chemical calculations using density functional theory (DFT), and mechanistic analyses. For 2-aliphatic (including acyloxy and alkenyl) chromanes, the P-helicity of the dihydropyran ring usually corresponds to a positive SOR; however, 2-aryl chromanes with P-helicity tend to exhibit negative SORs. 2-Carboxyl (including alkoxycarbonyl and carbonyl) chromanes often display small experimental SORs, and theoretical calculations for them are prone to error because of the fluctuating conformational distribution with computational parameters. Several typical compounds were discussed, including detailed descriptions of the asymmetric synthesis, absolute configuration (AC) assignment methods, and systematic conformational analysis. We hope this work will enrich the knowledge of the stereochemistry of chiral 2-substituted chromanes.
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2
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Lu Q, Harmalkar DS, Quan G, Kwon H, Cho J, Choi Y, Lee D, Lee K. Total Synthesis of the Neuroprotective Agent Cudraisoflavone J. JOURNAL OF NATURAL PRODUCTS 2021; 84:1359-1365. [PMID: 33826847 DOI: 10.1021/acs.jnatprod.1c00121] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Cudraisoflavone J (1), isolated from Cudrania tricuspidata, is a potent neuroprotective compound with a chiral center. Herein, we report the first total synthesis of racemic cudraisoflavone J (1) using a Claisen rearrangement and a Suzuki coupling reaction as the key steps. Racemic secondary alcohol was kinetically resolved to give (+)- and (-)-cudraisoflavone J with up to 97 and 88% enantiomeric excess, respectively. The modified Mosher's method was used to elucidate the absolute configuration of naturally occurring cudraisoflavone J.
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Affiliation(s)
- Qili Lu
- College of Pharmacy, Dongguk University-Seoul, Goyang 10326, Republic of Korea
| | - Dipesh S Harmalkar
- College of Pharmacy, Dongguk University-Seoul, Goyang 10326, Republic of Korea
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Guofeng Quan
- College of Pharmacy, Dongguk University-Seoul, Goyang 10326, Republic of Korea
| | - Haeun Kwon
- Department of Plant Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Jungsook Cho
- College of Pharmacy, Dongguk University-Seoul, Goyang 10326, Republic of Korea
| | - Yongseok Choi
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Dongho Lee
- Department of Plant Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Kyeong Lee
- College of Pharmacy, Dongguk University-Seoul, Goyang 10326, Republic of Korea
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3
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Schwarz M, Murphy EJ, Foley AM, Woods DF, Castilla IA, Reen FJ, Collins SG, O'Gara F, Maguire AR. Exploring the synthetic potential of a marine transaminase including discrimination at a remote stereocentre. Org Biomol Chem 2021; 19:188-198. [PMID: 33119023 DOI: 10.1039/d0ob01848a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The marine transaminase, P-ω-TA, can be employed for the transamination from 1-aminotetralins and 1-aminoindanes with differentiation of stereochemistry at both the site of reaction and at a remote stereocentre resulting in formation of ketone products with up to 93% ee. While 4-substituents are tolerated on the tetralin core, the presence of 3- or 8-substituents is not tolerated by the transaminase. In general P-ω-TA shows capacity for remote diastereoselectivity, although both the stereoselectivity and efficiency are dependent on the specific substrate structure. Optimum efficiency and selectivity are seen with 4-haloaryl-1-aminotetralins and 3-haloaryl-1-aminoindanes, which may be associated with the marine origin of this enzyme.
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Affiliation(s)
- Maria Schwarz
- School of Chemistry, Analytical and Biological Chemistry Research Facility, University College Cork, T12 K8AF, Cork, Ireland.
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4
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Gavin DP, Reen FJ, Rocha-Martin J, Abreu-Castilla I, Woods DF, Foley AM, Sánchez-Murcia PA, Schwarz M, O'Neill P, Maguire AR, O'Gara F. Genome mining and characterisation of a novel transaminase with remote stereoselectivity. Sci Rep 2019; 9:20285. [PMID: 31889089 PMCID: PMC6937235 DOI: 10.1038/s41598-019-56612-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 11/20/2019] [Indexed: 01/27/2023] Open
Abstract
Microbial enzymes from pristine niches can potentially deliver disruptive opportunities in synthetic routes to Active Pharmaceutical Ingredients and intermediates in the Pharmaceutical Industry. Advances in green chemistry technologies and the importance of stereochemical control, further underscores the application of enzyme-based solutions in chemical synthesis. The rich tapestry of microbial diversity in the oceanic ecosystem encodes a capacity for novel biotransformations arising from the chemical complexity of this largely unexplored bioactive reservoir. Here we report a novel ω-transaminase discovered in a marine sponge Pseudovibrio sp. isolate. Remote stereoselection using a transaminase has been demonstrated for the first time using this novel protein. Application to the resolution of an intermediate in the synthesis of sertraline highlights the synthetic potential of this novel biocatalyst discovered through genomic mining. Integrated chemico-genomics revealed a unique substrate profile, while molecular modelling provided structural insights into this ‘first in class’ selectivity at a remote chiral centre.
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Affiliation(s)
- D P Gavin
- School of Chemistry; Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland.,Synthesis and Solid State Pharmaceutical Centre, University College Cork, Cork, Ireland
| | - F J Reen
- BIOMERIT Research Centre, School of Microbiology, University College Cork, Cork, Ireland.,School of Microbiology, University College Cork, T12 K8AF, Cork, Ireland
| | - J Rocha-Martin
- BIOMERIT Research Centre, School of Microbiology, University College Cork, Cork, Ireland
| | - I Abreu-Castilla
- BIOMERIT Research Centre, School of Microbiology, University College Cork, Cork, Ireland
| | - D F Woods
- BIOMERIT Research Centre, School of Microbiology, University College Cork, Cork, Ireland
| | - A M Foley
- School of Chemistry, School of Pharmacy, Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland
| | - P A Sánchez-Murcia
- Institute of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 17, A-1090, Vienna, Austria
| | - M Schwarz
- School of Chemistry; Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland
| | - P O'Neill
- Pfizer Process Development Centre, Loughbeg, Cork, Ireland
| | - A R Maguire
- Synthesis and Solid State Pharmaceutical Centre, University College Cork, Cork, Ireland. .,School of Chemistry, School of Pharmacy, Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland.
| | - F O'Gara
- Synthesis and Solid State Pharmaceutical Centre, University College Cork, Cork, Ireland. .,BIOMERIT Research Centre, School of Microbiology, University College Cork, Cork, Ireland. .,Human Microbiome Programme, School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, Australia and Telethon Kids Institute, Perth, WA, 6008, Australia.
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5
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Foley AM, Maguire AR. The Impact of Recent Developments in Technologies which Enable the Increased Use of Biocatalysts. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900208] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Aoife M. Foley
- School of Chemistry; Analytical & Biological Chemistry Research Facility; Synthesis & Solid State Pharmaceutical Centre; University College Cork; Cork Ireland
| | - Anita R. Maguire
- School of Chemistry & School of Pharmacy; Analytical & Biological Chemistry Research Facility; Synthesis & Solid State Pharmaceutical Centre; University College Cork; Cork Ireland
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Glazier DA, Schroeder JM, Liu J, Tang W. Organocatalyst-Mediated Dynamic Kinetic Enantioselective Acylation of 2-Chromanols. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800994] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Daniel A. Glazier
- School of Pharmacy; University of Wisconsin-Madison; Madison WI 53705 USA
- Department of Chemistry; University of Wisconsin-Madison; Madison WI 53705 USA
| | - John M. Schroeder
- School of Pharmacy; University of Wisconsin-Madison; Madison WI 53705 USA
- Department of Chemistry; University of Wisconsin-Madison; Madison WI 53705 USA
| | - Jitian Liu
- Department of Chemistry; University of Wisconsin-Madison; Madison WI 53705 USA
| | - Weiping Tang
- School of Pharmacy; University of Wisconsin-Madison; Madison WI 53705 USA
- Department of Chemistry; University of Wisconsin-Madison; Madison WI 53705 USA
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