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Fazekas TJ, Micalizio GC. Progress Toward the Asymmetric De Novo Synthesis of Limonoids. Org Lett 2024; 26:1073-1077. [PMID: 38277646 DOI: 10.1021/acs.orglett.3c04306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2024]
Abstract
Asymmetric de novo construction of limonoids remains a challenging problem in stereoselective synthesis due to the diverse and complex structures associated with this class of natural products. Here, a unique synthetic pathway to an "intact" limonoid system is described. The synthetic route is based on exploiting an oxidative rearrangement reaction of a densely functionalized late-stage intermediate to simultaneously establish the stereodefined C10 quaternary center and an allylic acetate at C12. This is a unique example of a complex rearrangement reaction that proceeds on a system whose presumed intermediate allyl cation is highly hindered and lacks neighboring protons that are otherwise required for cation termination.
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Affiliation(s)
- Timothy J Fazekas
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, New Hampshire 03755, United States
| | - Glenn C Micalizio
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, New Hampshire 03755, United States
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Zhu QM, Wang C, Liu JW, Zhang R, Xin XL, Zhang J, Sun CP, Ma XC. Degradation profile of environmental pollutant 17β-estradiol by human intestinal fungus Aspergillus niger RG13B1 and characterization of genes involved in its degradation. JOURNAL OF HAZARDOUS MATERIALS 2024; 461:132617. [PMID: 37774607 DOI: 10.1016/j.jhazmat.2023.132617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/09/2023] [Accepted: 09/21/2023] [Indexed: 10/01/2023]
Abstract
Environmental hormones have attracted more attention because of their adverse impact on the health and ecological security of human. Biodegradation is still an efficient tactics to remove environmental hormones, but human intestinal microbes remain to be elucidated in the role of their degradation. In the present work, we intended to perform the in vitro experiment for investigating the degradation of 17β-estradiol, the main environmental estrogen, by human intestinal microflora Aspergillus niger RG13B1. Its degradation led to the production of eighteen metabolites characterized by 1H, 13C, and 2D NMR, and HRMS spectra, including nine new (1-9) and nine known metabolites (10-18). Based on their structures, the degradation pathway of 17β-estradiol mediated by A. niger RG13B1 involved hydroxylation, oxidation, methylation, acetylation, and dehydrogenation, especially infrequent lactylation, and the key degradation enzymes were found in the gene cluster of A. niger. In addition, we found that metabolite 12 interacted with amino acid residues Lys37, Gln39, Lys93, and Asn115 of NF-κB p65 to suppress expressions of inflammatory genes or proteins, exerting its anti-inflammatory effect. This study first illustrated the role of human gut microbe in 17β-estradiol degradation and provided new insights into its degradation mechanism by A. niger RG13B1.
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Affiliation(s)
- Qi-Meng Zhu
- Second Affiliated Hospital, Dalian Medical University, Dalian 116023, China; College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Chao Wang
- College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Jing-Wen Liu
- Second Affiliated Hospital, Dalian Medical University, Dalian 116023, China; College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Rui Zhang
- School of Chinese Materia Medica, State Key Laboratory of Component-Based Chinese Medicine, Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Xiu-Lan Xin
- College of Bioengineering, Beijing Polytechnic, Beijing 100029, China
| | - Juan Zhang
- Second Affiliated Hospital, Dalian Medical University, Dalian 116023, China; School of Pharmaceutical Sciences, Medical School, Shenzhen University, Shenzhen 518061, China.
| | - Cheng-Peng Sun
- Second Affiliated Hospital, Dalian Medical University, Dalian 116023, China; College of Pharmacy, Dalian Medical University, Dalian 116044, China; School of Chinese Materia Medica, State Key Laboratory of Component-Based Chinese Medicine, Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.
| | - Xiao-Chi Ma
- Second Affiliated Hospital, Dalian Medical University, Dalian 116023, China.
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Abstract
Asymmetric de novo syntheses of euphol and tirucallol have been accomplished by way of a concise sequence of chemical steps featuring several modern stereoselective transformations. The preparative solution described for these complex problems in natural product synthesis departs significantly from biomimetic polyene cyclization chemistry, which has been leveraged to address related tetracyclic triterpenoid targets. In particular, a diastereoselective Friedel-Crafts-type cyclization was employed to establish a tetracycle bearing a stereodefined quaternary center at C9 (steroid numbering) that provided access to intermediates of relevance for introducing the C10 and C14 quaternary centers by sequential stereospecific 1,2-alkyl shifts (C9 → C10 and C15 → C14). Finally, the stereodefined C17 side chain was introduced in a single step by late-stage stereoselective conjugate addition to an intermediate possessing a D-ring enone. Notably, these de novo asymmetric syntheses are the first of their kind, providing completely synthetic access to enantiodefined euphane and tirucallane systems. Overall, each synthesis has been accomplished in fewer than 20 linear chemical steps from a simple Hajos-Parrish-derived ketone through a sequence that features just 15 chromatographic operations.
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Affiliation(s)
- Joshua M. Nicholson
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755, United States
| | - Glenn C. Micalizio
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755, United States
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Kislyi VP, Zubavichus YV, Babievsky KK, Khrustalev VN, Pivnitsky KK. Racemic estrone methyl ether is the lamellar conglomerate. MENDELEEV COMMUNICATIONS 2019. [DOI: 10.1016/j.mencom.2019.05.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Prokai-Tatrai K, Nguyen V, Prokai L. 10β,17α-Dihydroxyestra-1,4-dien-3-one: A Bioprecursor Prodrug Preferentially Producing 17α-Estradiol in the Brain for Targeted Neurotherapy. ACS Chem Neurosci 2018; 9:2528-2533. [PMID: 29843514 PMCID: PMC6582959 DOI: 10.1021/acschemneuro.8b00184] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Uterotrophic effect of 17α-estradiol, the C17 epimer of the main human estrogen 17β-estradiol, was shown to manifest in animal models at doses lower than those necessary for central outcome raising concerns about its potential to treat maladies of the central nervous system. We introduce here 10β,17α-dihydroxyestra-1,4-dien-3-one (α-DHED) that acts as a bioprecursor prodrug producing 17α-estradiol with remarkable selectivity to the brain and, therefore, without appreciable exposure of the periphery to the parent steroid. This distinguishing feature of α-DHED is shown by using an estrogen-responsive mouse model with complementary LC-MS/MS measurement of drug contents in target tissues. Our data warrant further research to fully establish the potential of α-DHED for a safe and efficacious 17α-estradiol-based neurotherapy.
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Affiliation(s)
| | - Vien Nguyen
- Department of Pharmacology and Neuroscience, and the Institute for Healthy Aging, University of North Texas Health Science Center, 3500 Camp Bowie Boulevard, Fort Worth, TX 76107-2699, USA
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Koshino S, Kwon E, Hayashi Y. Total Synthesis of Estradiol Methyl Ether and Its Five-Pot Synthesis with an Organocatalyst. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800910] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Seitaro Koshino
- Department of Chemistry; Graduate School of Science; Tohoku University; 6-3 Aramaki-Aza Aoba, Aoba-ku 980-8578 Sendai Japan
| | - Eunsang Kwon
- Research and Analytical Center for Giant Molecules; Graduate School of Science; Tohoku University; 6-3 Aramaki-Aza Aoba, Aoba-ku 980-8578 Sendai Japan
| | - Yujiro Hayashi
- Department of Chemistry; Graduate School of Science; Tohoku University; 6-3 Aramaki-Aza Aoba, Aoba-ku 980-8578 Sendai Japan
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Focken T, Hanessian S. Application of cyclic phosphonamide reagents in the total synthesis of natural products and biologically active molecules. Beilstein J Org Chem 2014; 10:1848-77. [PMID: 25246946 PMCID: PMC4168934 DOI: 10.3762/bjoc.10.195] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 06/26/2014] [Indexed: 12/12/2022] Open
Abstract
A review of the synthesis of natural products and bioactive compounds adopting phosphonamide anion technology is presented highlighting the utility of phosphonamide reagents in stereocontrolled bond-forming reactions. Methodologies utilizing phosphonamide anions in asymmetric alkylations, Michael additions, olefinations, and cyclopropanations will be summarized, as well as an overview of the synthesis of the employed phosphonamide reagents.
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Affiliation(s)
- Thilo Focken
- Xenon Pharmaceuticals Inc., 3650 Gilmore Way, Burnaby, BC V5G 4W8, Canada
| | - Stephen Hanessian
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, QC H3C 3J7, Canada
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Kotora M, Hessler F, Eignerová B. Transition‐Metal‐Mediated or ‐Catalyzed Syntheses of Steroids and Steroid‐Like Compounds. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100921] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Martin Kotora
- Dept. of Organic and Nuclear Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 12843 Praha 2, Czech Republic, Fax: +420‐221‐951‐326
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nám. 2, 166 10 Praha 6, Czech Republic
| | - Filip Hessler
- Dept. of Organic and Nuclear Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 12843 Praha 2, Czech Republic, Fax: +420‐221‐951‐326
| | - Barbara Eignerová
- Dept. of Organic and Nuclear Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 12843 Praha 2, Czech Republic, Fax: +420‐221‐951‐326
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Foucher V, Guizzardi B, Groen MB, Light M, Linclau B. A Novel, Versatile D→BCD Steroid Construction Strategy, Illustrated by the Enantioselective Total Synthesis of Estrone. Org Lett 2010; 12:680-3. [DOI: 10.1021/ol902638w] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vincent Foucher
- University of Southampton, School of Chemistry, Highfield, Southampton SO17 1BJ, United Kingdom and Organon, Molenstraat 110, P.O. Box 20, 5340 BH Oss, The Netherlands
| | - Benedetta Guizzardi
- University of Southampton, School of Chemistry, Highfield, Southampton SO17 1BJ, United Kingdom and Organon, Molenstraat 110, P.O. Box 20, 5340 BH Oss, The Netherlands
| | - Marinus B. Groen
- University of Southampton, School of Chemistry, Highfield, Southampton SO17 1BJ, United Kingdom and Organon, Molenstraat 110, P.O. Box 20, 5340 BH Oss, The Netherlands
| | - Mark Light
- University of Southampton, School of Chemistry, Highfield, Southampton SO17 1BJ, United Kingdom and Organon, Molenstraat 110, P.O. Box 20, 5340 BH Oss, The Netherlands
| | - Bruno Linclau
- University of Southampton, School of Chemistry, Highfield, Southampton SO17 1BJ, United Kingdom and Organon, Molenstraat 110, P.O. Box 20, 5340 BH Oss, The Netherlands
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Affiliation(s)
- James R Hanson
- Department of Chemistry, University of Sussex, Brighton, Sussex, BN1 9QJ, UK
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