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β-Fluorinated Paraconic Acid Derivatives: Synthesis and Fluorine Stereoelectronic Effects. J Fluor Chem 2021. [DOI: 10.1016/j.jfluchem.2021.109860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Nazari A, Heravi MM, Zadsirjan V. Oxazolidinones as chiral auxiliaries in asymmetric aldol reaction applied to natural products total synthesis. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2020.121629] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Liu X, Zhao M, Fan X, Fu Y. Reshaping the active pocket of esterase Est816 for resolution of economically important racemates. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01028j] [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
Eight 2-arylpropionic acids with high E values were generated by engineered Est816, which overcomes the contradiction between the wide substrate scope and high enantioselectivity of esterases.
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Affiliation(s)
- Xiaolong Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, iChEM, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Meng Zhao
- School of Basic Medical Sciences, Anhui Medical University, 81 Meishan Rd, Hefei, 230032, Anhui, People's Republic of China
| | - Xinjiong Fan
- School of Basic Medical Sciences, Anhui Medical University, 81 Meishan Rd, Hefei, 230032, Anhui, People's Republic of China
| | - Yao Fu
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, iChEM, University of Science and Technology of China, Hefei, Anhui 230026, China
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Lehner V, Davies HML, Reiser O. Rh(II)-Catalyzed Cyclopropanation of Furans and Its Application to the Total Synthesis of Natural Product Derivatives. Org Lett 2017; 19:4722-4725. [PMID: 28846420 DOI: 10.1021/acs.orglett.7b02009] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Rh(II)-catalyzed enantioselective cyclopropanations of furans, providing access to synthetically useful building blocks, are reported. After screening of 10 Rh(II) catalysts, Rh2(S-TCPTTL)4 was identified as a highly efficient and selective catalyst (up to 98% ee, TON 88000, and TOF 24/s) for the cyclopropanation of furans. These cyclopropanes were successfully applied to the enantioselective synthesis of novel paraconic acid derivatives.
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Affiliation(s)
- Verena Lehner
- Institute of Organic Chemistry, University of Regensburg , Universitätsstraße 31, 93053 Regensburg, Germany.,Department of Chemistry, Emory University , 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | - Huw M L Davies
- Department of Chemistry, Emory University , 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | - Oliver Reiser
- Institute of Organic Chemistry, University of Regensburg , Universitätsstraße 31, 93053 Regensburg, Germany
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Paek SM, Jeong M, Jo J, Heo YM, Han YT, Yun H. Recent Advances in Substrate-Controlled Asymmetric Induction Derived from Chiral Pool α-Amino Acids for Natural Product Synthesis. Molecules 2016; 21:E951. [PMID: 27455209 PMCID: PMC6274556 DOI: 10.3390/molecules21070951] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 07/07/2016] [Accepted: 07/18/2016] [Indexed: 11/20/2022] Open
Abstract
Chiral pool α-amino acids have been used as powerful tools for the total synthesis of structurally diverse natural products. Some common naturally occurring α-amino acids are readily available in both enantiomerically pure forms. The applications of the chiral pool in asymmetric synthesis can be categorized prudently as chiral sources, devices, and inducers. This review specifically examines recent advances in substrate-controlled asymmetric reactions induced by the chirality of α-amino acid templates in natural product synthesis research and related areas.
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Affiliation(s)
- Seung-Mann Paek
- College of Pharmacy, Research Institute of Pharmaceutical Science, Gyeongsang National University, Jinju daero, Jinju 52828, Korea.
| | - Myeonggyo Jeong
- College of Pharmacy, Pusan National University, Busan 46241, Korea.
| | - Jeyun Jo
- College of Pharmacy, Pusan National University, Busan 46241, Korea.
| | - Yu Mi Heo
- College of Pharmacy, Research Institute of Pharmaceutical Science, Gyeongsang National University, Jinju daero, Jinju 52828, Korea.
| | - Young Taek Han
- College of Pharmacy, Dankook University, Cheonan 31116, Korea.
| | - Hwayoung Yun
- College of Pharmacy, Pusan National University, Busan 46241, Korea.
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Jain N, Bedekar AV. Lipase catalyzed desymmetrization of roof shape cis-11,12-bis(hydroxymethyl)-9,10-dihydro-9,10-ethanoanthracene. RSC Adv 2015. [DOI: 10.1039/c5ra11626k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Biocatalyzed desymmetrization of roof shape meso cis-11,12-bis(hydroxymethyl)-9,10-dihydro-9,10-ethanoanthracene has been achieved.
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Affiliation(s)
- Nilesh Jain
- Department of Chemistry
- Faculty of Science
- M.S. University of Baroda
- Vadodara 390 002
- India
| | - Ashutosh V. Bedekar
- Department of Chemistry
- Faculty of Science
- M.S. University of Baroda
- Vadodara 390 002
- India
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Marković D, Barboux C, Salle de Chou Y, Bettach J, Grougnet R, Deguin B. Centrifugal partition chromatography: an efficient tool to access highly polar and unstable synthetic compounds on a large scale. RSC Adv 2014. [DOI: 10.1039/c4ra12141d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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Lemoine H, Marković D, Deguin B. Mild and chemoselective lactone ring-opening with (TMS)ONa. Mechanistic studies and application to sweroside derivatives. J Org Chem 2014; 79:4358-66. [PMID: 24738692 DOI: 10.1021/jo500220h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mild and chemoselective opening of lactones with sodium trimethylsilanolate in high yields and aprotic solvents is described. Kinetic studies demonstrate that the B(Ac)2 mechanistic pathway is followed. Nucleophilic attack of silanolate onto the carbonyl of the lactone moiety is the rate-determining step. NaOH present as an impurity accelerates the reaction. The method was further applied to the base-sensitive and stable lactones derived from highly functionalized iridoid derivatives.
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Affiliation(s)
- Hugues Lemoine
- Laboratoire de Pharmacognosie, Faculté des Sciences Pharmaceutiques et Biologiques, Université Paris Descartes, Sorbonne Paris Cité, UMR/CNRS No. 8638 , 4 Avenue de l'Observatoire, F-75006 Paris, France
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Updates on Antiobesity Effect of Garcinia Origin (-)-HCA. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:751658. [PMID: 23990846 PMCID: PMC3748738 DOI: 10.1155/2013/751658] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2013] [Accepted: 07/07/2013] [Indexed: 12/11/2022]
Abstract
Garcinia is a plant under the family of Clusiaceae that is commonly used as a flavouring agent. Various phytochemicals including flavonoids and organic acid have been identified in this plant. Among all types of organic acids, hydroxycitric acid or more specifically (−)-hydroxycitric acid has been identified as a potential supplement for weight management and as antiobesity agent. Various in vivo studies have contributed to the understanding of the anti-obesity effects of Garcinia/hydroxycitric acid via regulation of serotonin level and glucose uptake. Besides, it also helps to enhance fat oxidation while reducing de novo lipogenesis. However, results from clinical studies showed both negative and positive antiobesity effects of Garcinia/hydroxycitric acid. This review was prepared to summarise the update of chemical constituents, significance of in vivo/clinical anti-obesity effects, and the importance of the current market potential of Garcinia/hydroxycitric acid.
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Polavarapu PL, Donahue EA, Hammer KC, Raghavan V, Shanmugam G, Ibnusaud I, Nair DS, Gopinath C, Habel D. Chiroptical spectroscopy of natural products: avoiding the aggregation effects of chiral carboxylic acids. JOURNAL OF NATURAL PRODUCTS 2012; 75:1441-1450. [PMID: 22877358 DOI: 10.1021/np300341z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Determination of the absolute configurations and predominant conformations of chiral natural products, occurring as carboxylic acids, using chiroptical spectroscopic methods becomes challenging due to the formation of solute aggregates (in the form of dimers, etc.) and/or solute-solvent complexes resulting from intermolecular hydrogen bonding with solvent. A hypothesis that such aggregation effects can be avoided by using corresponding sodium salts or acid anhydrides for chiroptical spectroscopic measurements has been tested. For this purpose, vibrational circular dichroism, electronic circular dichroism, and optical rotatory dispersion spectra for disodium salts of two natural products, hibiscus acid and garcinia acid, and the anhydride of acetylated garcinia acid have been measured. These experimental spectra are analyzed in combination with quantum chemical calculations of corresponding spectra. The spectral analysis for sodium salts and anhydride turned out to be simpler, suggesting that the conversion of carboxylic acids to corresponding salts or anhydride can be advantageous for the application of chiroptical spectroscopy.
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