1
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Sun Y, Fu S, Liu B. Asymmetric synthesis of the fully functionalized six-membered A-ring of siphonol A. Org Biomol Chem 2024; 22:2958-2962. [PMID: 38483290 DOI: 10.1039/d4ob00104d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2024]
Abstract
A synthetic study toward the construction of the fully functionalized six-membered A-ring of siphonol A is described. The salient features include the introduction of a six-membered ring system through a HWE reaction, the construction of a stereocenter at C5 via a hetero-Diels-Alder reaction, and the installation of the fully functionalized six-membered A-ring of siphonol A through photolytic decarboxylation.
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Affiliation(s)
- Ying Sun
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Shaomin Fu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China.
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2
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Plangger I, Wurst K, Magauer T. Short, Divergent, and Enantioselective Total Synthesis of Bioactive ent-Pimaranes. Org Lett 2022; 24:7151-7156. [PMID: 36170466 PMCID: PMC7613685 DOI: 10.1021/acs.orglett.2c02843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present the first total synthesis of eight ent-pimaranes via a short and enantioselective route (11-16 steps). Key features of the divergent synthesis are a Sharpless asymmetric dihydroxylation, a Brønsted acid catalyzed cationic bicyclization, and a mild Rh-catalyzed arene hydrogenation for rapid access to a late synthetic branching point. From there on, selective functional group manipulations enable the synthesis of ent-pimaranes bearing different modifications in the A- and C-rings.
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Affiliation(s)
- Immanuel Plangger
- Institute of Organic Chemistry and Center for Molecular Biosciences, Leopold-Franzens-University Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Klaus Wurst
- Institute of General, Inorganic and Theoretical Chemistry, Leopold-Franzens-University Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Thomas Magauer
- Institute of Organic Chemistry and Center for Molecular Biosciences, Leopold-Franzens-University Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
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3
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Dou JY, Jiang YC, Cui ZY, Lian LH, Nan JX, Wu YL. Acanthoic acid, unique potential pimaradiene diterpene isolated from Acanthopanax koreanum Nakai (Araliaceae): A review on its pharmacology, molecular mechanism, and structural modification. PHYTOCHEMISTRY 2022; 200:113247. [PMID: 35597316 DOI: 10.1016/j.phytochem.2022.113247] [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: 03/30/2022] [Revised: 05/12/2022] [Accepted: 05/13/2022] [Indexed: 06/15/2023]
Abstract
Acanthoic acid (AA) is a pimaradiene diterpene isolated from the root bark of Acanthopanax koreanum Nakai (Araliaceae) with a wide range of pharmacological activities, including anti-cancer, anti-inflammatory, anti-diabetes, liver protection, gastrointestinal protection, and cardiovascular protection. In addition, AA promotes its pharmacological effects by targeting liver X receptors (LXRs), nuclear factor-kappa B (NF-κB), Toll-Like Receptor 4 (TLR4) and IL-1 receptor-associated kinase (IRAK) signaling pathways, or AMP-activated protein kinase (AMPK) signaling pathway, etc. Also, some studies focus on the structural modification of AA to improve its pharmacological activities. The review summarizes the pharmacological activities, molecular mechanism, and the structural modification of AA, which might supply information for the development of AA in the future.
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Affiliation(s)
- Jia-Yi Dou
- Key Laboratory of Traditional Chinese Korean Medicine Research (Yanbian University), State Ethnic Affairs Commission, College of Pharmacy, Yanbian University, Yanji, Jilin Province, 133002, China
| | - Yu-Chen Jiang
- Key Laboratory of Traditional Chinese Korean Medicine Research (Yanbian University), State Ethnic Affairs Commission, College of Pharmacy, Yanbian University, Yanji, Jilin Province, 133002, China
| | - Zhen-Yu Cui
- Key Laboratory of Traditional Chinese Korean Medicine Research (Yanbian University), State Ethnic Affairs Commission, College of Pharmacy, Yanbian University, Yanji, Jilin Province, 133002, China
| | - Li-Hua Lian
- Key Laboratory of Traditional Chinese Korean Medicine Research (Yanbian University), State Ethnic Affairs Commission, College of Pharmacy, Yanbian University, Yanji, Jilin Province, 133002, China
| | - Ji-Xing Nan
- Key Laboratory of Traditional Chinese Korean Medicine Research (Yanbian University), State Ethnic Affairs Commission, College of Pharmacy, Yanbian University, Yanji, Jilin Province, 133002, China; Clinical Research Center, Affiliated Hospital of Yanbian University, Yanji, Jilin Province, 133002, China.
| | - Yan-Ling Wu
- Key Laboratory of Traditional Chinese Korean Medicine Research (Yanbian University), State Ethnic Affairs Commission, College of Pharmacy, Yanbian University, Yanji, Jilin Province, 133002, China.
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4
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Hou W, Cao X, Xu P, Yu B. Total syntheses of wentilactones A and B, and related norditerpene dilactones. Chem Commun (Camb) 2022; 58:12487-12490. [DOI: 10.1039/d2cc04930a] [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
A divergent approach toward the synthesis of A-ring functionalized tetranorditerpenoid dilactones has been developed, employing 3β-hydroxydilactone 6 as a common precursor which is readily derived from (S)-Wieland–Miescher ketone.
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Affiliation(s)
- Wu Hou
- School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Shanghai 201210, China
| | - Xin Cao
- Zhongshan Hospital Institute of Clinical Science, Fudan University Shanghai Medical College, 180 Fengling Road, Shanghai 200032, China
| | - Peng Xu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Biao Yu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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5
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Kim Y, Sengupta S, Sim T. Natural and Synthetic Lactones Possessing Antitumor Activities. Int J Mol Sci 2021; 22:ijms22031052. [PMID: 33494352 PMCID: PMC7865919 DOI: 10.3390/ijms22031052] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 01/14/2021] [Accepted: 01/16/2021] [Indexed: 12/29/2022] Open
Abstract
Cancer is one of the leading causes of death globally, accounting for an estimated 8 million deaths each year. As a result, there have been urgent unmet medical needs to discover novel oncology drugs. Natural and synthetic lactones have a broad spectrum of biological uses including anti-tumor, anti-helminthic, anti-microbial, and anti-inflammatory activities. Particularly, several natural and synthetic lactones have emerged as anti-cancer agents over the past decades. In this review, we address natural and synthetic lactones focusing on their anti-tumor activities and synthetic routes. Moreover, we aim to highlight our journey towards chemical modification and biological evaluation of a resorcylic acid lactone, L-783277 (4). We anticipate that utilization of the natural and synthetic lactones as novel scaffolds would benefit the process of oncology drug discovery campaigns based on natural products.
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Affiliation(s)
- Younghoon Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea;
- Severance Biomedical Science Institute, Graduate School of Medical Science (Brain Korea 21 Project), College of Medicine, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea;
| | - Sandip Sengupta
- Severance Biomedical Science Institute, Graduate School of Medical Science (Brain Korea 21 Project), College of Medicine, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea;
| | - Taebo Sim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea;
- Severance Biomedical Science Institute, Graduate School of Medical Science (Brain Korea 21 Project), College of Medicine, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea;
- Correspondence: ; Tel.: +82-2-2228-0797
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6
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Kim MJ, Lee S, Kang T, Baik MH, Lee HY. Unexpected Selectivity of Intramolecular [3+2] Cycloaddition of Trimethylenemethane (TMM) Diyl toward Total Synthesis of Conidiogenone B. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901700] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Myungjo J. Kim
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); 34141 Daejeon Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); 34141 Daejeon Republic of Korea
| | - Sanghyeon Lee
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); 34141 Daejeon Republic of Korea
| | - Taek Kang
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); 34141 Daejeon Republic of Korea
| | - Mu-Hyun Baik
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); 34141 Daejeon Republic of Korea
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); 34141 Daejeon Republic of Korea
| | - Hee-Yoon Lee
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); 34141 Daejeon Republic of Korea
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7
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Temperini A, Ballarotto M, Siciliano C. Chemoselective and metal-free reduction of α,β-unsaturated ketones by in situ produced benzeneselenol from O-( tert-butyl) Se-phenyl selenocarbonate. RSC Adv 2020; 10:33706-33717. [PMID: 35519049 PMCID: PMC9056720 DOI: 10.1039/d0ra07128e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 08/28/2020] [Indexed: 12/04/2022] Open
Abstract
The carbon–carbon double bond of arylidene acetones and chalcones can be selectively reduced with benzeneselenol generated in situ by reacting O-(tert-butyl) Se-phenyl selenocarbonate with hydrochloric acid in ethanol. This mild, metal-free and experimentally simple reduction procedure displays considerable functional-group compatibility, products are obtained in good to excellent yields, and the use of toxic Se/CO mixture and NaSeH, or the smelly and air-sensitive benzeneselenol, is avoided. The carbon–carbon double bond of arylidene acetones and chalcones can be selectively reduced with benzeneselenol generated in situ by reacting O-(tert-butyl) Se-phenyl selenocarbonate with hydrochloric acid in ethanol.![]()
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Affiliation(s)
- Andrea Temperini
- Dipartimento di Scienze Farmaceutiche
- Università di Perugia
- Consorzio C.I.N.M.P.I.S
- 06123 Perugia
- Italy
| | - Marco Ballarotto
- Dipartimento di Scienze Farmaceutiche
- Università di Perugia
- Consorzio C.I.N.M.P.I.S
- 06123 Perugia
- Italy
| | - Carlo Siciliano
- Dipartimento di Farmacia e Scienze della Salute e della Nutrizione
- Università della Calabria
- Cosenza
- Italy
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8
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Prasanna R, Guha S, Sekar G. Proton-Coupled Electron Transfer: Transition-Metal-Free Selective Reduction of Chalcones and Alkynes Using Xanthate/Formic Acid. Org Lett 2019; 21:2650-2653. [DOI: 10.1021/acs.orglett.9b00635] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Ramanathan Prasanna
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Somraj Guha
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Govindasamy Sekar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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9
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Leonelli F, Trombetta A, La Bella A, Lucarelli G, Demitri N, Lamba D, Migneco LM, Marini Bettolo R. Enantioselective Synthesis and X-ray Structure of (+)((4a S
,5 S
,8a S
)-5,8a-Dimethyl-7-methyleneoctahydro-2 H
-spiro[naphthalene-1,2′-[1,3]dioxolan]-5-yl)methyl-4-iodobenzoate. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801771] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Francesca Leonelli
- Dipartimento di Biologia Ambientale; Università degli Studi di Roma “La Sapienza”; Piazzale Aldo Moro, 5 00185 Roma Italy
| | - Andrea Trombetta
- Dipartimento di Chimica; Università degli Studi di Roma “La Sapienza”; Piazzale Aldo Moro, 5 00185 Roma Italy
| | - Angela La Bella
- Dipartimento di Chimica; Università degli Studi di Roma “La Sapienza”; Piazzale Aldo Moro, 5 00185 Roma Italy
| | - Giulio Lucarelli
- Dipartimento di Chimica; Università degli Studi di Roma “La Sapienza”; Piazzale Aldo Moro, 5 00185 Roma Italy
| | - Nicola Demitri
- Elettra-Sincrotrone S.S. 14; Km 163.5 in Area Science Park 34149 Basovizza, Trieste Italy
| | - Doriano Lamba
- Istituto di CristallografiaCNR, S.S. 14; Km 163.5 in Area Science Park 34149 Basovizza, Trieste Italy
| | - Luisa Maria Migneco
- Dipartimento di Chimica; Università degli Studi di Roma “La Sapienza”; Piazzale Aldo Moro, 5 00185 Roma Italy
| | - Rinaldo Marini Bettolo
- Dipartimento di Chimica; Università degli Studi di Roma “La Sapienza”; Piazzale Aldo Moro, 5 00185 Roma Italy
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10
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Song J, Han X, Yao YL, Li YM, Zhang J, Shao DY, Hou LS, Fan Y, Song SZ, Lian LH, Nan JX, Wu YL. Acanthoic acid suppresses lipin1/2 via TLR4 and IRAK4 signalling pathways in EtOH- and lipopolysaccharide-induced hepatic lipogenesis. J Pharm Pharmacol 2018; 70:393-403. [DOI: 10.1111/jphp.12877] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 12/16/2017] [Indexed: 12/16/2022]
Abstract
Abstract
Objectives
In alcoholic liver disease, alcohol and lipopolysaccharide (LPS) are major stimulation factors of hepatic lipogenesis. Our objective was to determine the protective mechanism of acanthoic acid (AA) in EtOH- and LPS-induced hepatic lipogenesis.
Methods
HSC-T6 cells were treated with ethanol (200 mm) plus LPS (1 μg/ml) for 1 h, followed by AA (10 or 20 μm) for another 6 h. C57BL/6 mice were pretreated with of AA (20 and 40 mg/kg) or equal volume of saline and then exposed to three doses of ethanol (5 g/kg body weight) within 24 h. The mice were sacrificed at 6 h after the last ethanol dosing.
Key findings
Acanthoic acid significantly decreased the expressions of α-SMA, collagen-I, SREBP-1, and lipin1/2 induced, also decreased fat droplets caused by EtOH/LPS. AA treatment decreased the protein expressions of TLR4, CD14, IRAK4, TRAF3, p-TAK1 and NF-κB increased by EtOH/LPS on HSC cells. Results in vivo were consistent with results in vitro.
Conclusions
Our data demonstrated that AA might modulate hepatic fibrosis and lipid deposition in HSC-T6 cell stimulated with ethanol combined with LPS by decreasing lipin1/2 via TLR4 and IRAK4 signalling pathways, and AA might be considered as a potential therapeutic candidate for alcoholic liver disease.
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Affiliation(s)
- Jian Song
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Xin Han
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - You-Li Yao
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Ya-Mei Li
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Jing Zhang
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Dan-Yang Shao
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Li-Shuang Hou
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Ying Fan
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Shun-Zong Song
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Li-Hua Lian
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Ji-Xing Nan
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
- Clinical Research Center, Yanbian University Hospital, Yanji, China
| | - Yan-Ling Wu
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
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11
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Abstract
Terpenoids are a very prominent class of natural compounds produced in diverse genera of plants, fungi, algae and sponges. They gained significant pharmaceutical value since prehistoric times, due to their broad spectrum of medical applications. The fragrant leaves of Eucalyptus trees are a rich source of terpenoids. Therefore this review starts by summarizing the main terpenoid compounds present in Eucalyptus globulus, E. citriodora, E. radiata and E. resinifera and describing their biosynthetic pathways. Of the enormous number of pharmaceutically important terpenoids, this paper also reviews some well established and recently discovered examples and discusses their medical applications. In this context, the synthetic processes for (–)-menthol, (–)- cis-carveol, (+)-artemisinine, (+)-merrilactone A and (–)-sclareol are presented. The tricyclic sesquiterpene (–)-englerin A isolated from the stem bark of the Phyllanthus engleri plant ( Euphorbiaceae) is highly active against certain renal cancer cell lines. In addition, recent studies showed that englerin A is also a potent and selective activator of TRPC4 and TRPC5 calcium channels. These important findings were the motivation for several renowned research labs to achieve a total synthesis of (–)-englerin A. Two prominent examples – Christmann and Metz – are compared and discussed in detail.
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Affiliation(s)
- Rolf Jaeger
- Formerly Institute of Organic Chemistry, Kiel University, Otto-Hahn-Platz, 24098 Kiel, Germany
| | - Eckehard Cuny
- Clemens-Schöpf-Institute of Organic Chemistry and Biochemistry, Darmstadt Technical University, Alarich-Weiss-Straße 4, 64287 Darmstadt, Germany
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12
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Oikawa Y, Uchiyama D, Shirasawa T, Oikawa M, Ishikawa Y. Synthetic study of strongylophorines: stereoselective construction of the characteristic lactone bridge. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.07.067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Obora Y. C-Alkylation by Hydrogen Autotransfer Reactions. Top Curr Chem (Cham) 2016; 374:11. [PMID: 27573136 DOI: 10.1007/s41061-016-0012-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 02/11/2016] [Indexed: 01/04/2023]
Abstract
The development of practical, efficient, and atom-economical methods for the formation of carbon-carbon bonds remains a topic of considerable interest in current synthetic organic chemistry. In this review, we have summarized selected topics from the recent literature with particular emphasis on C-alkylation processes involving hydrogen transfer using alcohols as alkylation reagents. This review includes selected highlights concerning recent progress towards the modification of catalytic systems for the α-alkylation of ketones, nitriles, and esters. Furthermore, we have devoted a significant portion of this review to the methylation of ketones, alcohols, and indoles using methanol. Lastly, we have also documented recent advances in β-alkylation methods involving the dimerization of alcohols (Guerbet reaction), as well as new developments in C-alkylation methods based on sp (3) C-H activation.
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Affiliation(s)
- Yasushi Obora
- Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, Suita, Osaka, 564-8680, Japan.
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14
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Lacoske MH, Xu J, Mansour N, Gao C, Theodorakis EA. Synthetic Strategies Toward the Decalin Motif of Maklamicin and Related Spirotetronates. Org Chem Front 2015; 2:388-393. [PMID: 26257916 PMCID: PMC4527581 DOI: 10.1039/c4qo00332b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we describe a scalable approach to the decalin moiety of maklamicin. Key to the synthesis is an intramolecular Diels-Alder (IMDA) reaction that proceeds via an endo-axial transition state to generate the desired stereochemistry. We explored the diastereoselectivity of the IMDA reaction as a function of both chiral catalysis and acyclic precursor stereochemistry.
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Affiliation(s)
- Michelle H. Lacoske
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Jing Xu
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
- Department of Chemistry, South University of Science and Technology of China, Shenzhen, Guangdong 518055, China
| | - Noel Mansour
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Chao Gao
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Emmanuel A. Theodorakis
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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15
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Guo L, Ma X, Fang H, Jia X, Huang Z. A General and mild catalytic α-alkylation of unactivated esters using alcohols. Angew Chem Int Ed Engl 2015; 54:4023-7. [PMID: 25651099 DOI: 10.1002/anie.201410293] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Indexed: 01/18/2023]
Abstract
Catalytic α-alkylation of esters with primary alcohols is a desirable process because it uses low-toxicity agents and generates water as the by-product. Reported herein is a NCP pincer/Ir catalyst which is highly efficient for α-alkylation of a broad scope of unactivated esters under mild reaction conditions. For the first time, alcohols alkylate unactivated α-substituted acyclic esters, lactones, and even methyl and ethyl acetates. This method can be applied to the synthesis of carboxylic acid derivatives with diverse structures and functional groups, some of which would be impossible to access by conventional enolate alkylations with alkyl halides.
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Affiliation(s)
- Le Guo
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, 345 Lingling Road, Shanghai 200032 (China)
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16
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Guo L, Ma X, Fang H, Jia X, Huang Z. A General and Mild Catalytic α-Alkylation of Unactivated Esters Using Alcohols. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201410293] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Través PG, Pimentel-Santillana M, Rico D, Rodriguez N, Miethke T, Castrillo A, Theodorakis EA, Martín-Sanz P, Palladino MA, Boscá L. Anti-inflammatory actions of acanthoic acid-related diterpenes involve activation of the PI3K p110γ/δ subunits and inhibition of NF-κB. CHEMISTRY & BIOLOGY 2014; 21:955-66. [PMID: 25065531 DOI: 10.1016/j.chembiol.2014.06.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 05/29/2014] [Accepted: 06/09/2014] [Indexed: 02/06/2023]
Abstract
The effect of acanthoic acid analogs on the response to proinflammatory challenge was investigated. Some pimarane diterpenes are known activators of the LXRαβ nuclear receptors, but we show here that they also exert a rapid, potent, and selective activation of the p110γ and p110δ subunits of PI3K. Combination of these effects results in an important attenuation of the global transcriptional response to LPS in macrophages. PI3K/Akt activation leads to inhibition of the LPS-dependent stimulation of IKK/NF-κB and p38 and ERK MAPKs. Macrophages from LXRαβ-deficient mice exhibited an inhibition of these pathways similar to the corresponding wild-type cells. Silencing or inhibition of p110γ/δ suppressed the effect of these diterpenes (DTPs) on IKK/NF-κB and MAPKs signaling. Taken together, these data show a multitarget anti-inflammatory mechanism by these DTPs including a selective activation of PI3K isoenzymes.
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Affiliation(s)
- Paqui G Través
- Instituto de Investigaciones Biomédicas Alberto Sols, Centro Mixto CSIC-UAM, Unidad Asociada Universidad de las Palmas de Gran Canaria, Arturo Duperier 4, 28029 Madrid, Spain
| | - María Pimentel-Santillana
- Instituto de Investigaciones Biomédicas Alberto Sols, Centro Mixto CSIC-UAM, Unidad Asociada Universidad de las Palmas de Gran Canaria, Arturo Duperier 4, 28029 Madrid, Spain
| | - Daniel Rico
- Structural Biology and BioComputing Programme, National Cancer Research Center (CNIO), Melchor Fernández Almagro 3, 28029 Madrid, Spain
| | - Nuria Rodriguez
- Institut of Microbiology and Hygiene, Medical Faculty Mannheim, University of Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
| | - Thomas Miethke
- Institut of Microbiology and Hygiene, Medical Faculty Mannheim, University of Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
| | - Antonio Castrillo
- Instituto de Investigaciones Biomédicas Alberto Sols, Centro Mixto CSIC-UAM, Unidad Asociada Universidad de las Palmas de Gran Canaria, Arturo Duperier 4, 28029 Madrid, Spain
| | - Emmanuel A Theodorakis
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
| | - Paloma Martín-Sanz
- Instituto de Investigaciones Biomédicas Alberto Sols, Centro Mixto CSIC-UAM, Unidad Asociada Universidad de las Palmas de Gran Canaria, Arturo Duperier 4, 28029 Madrid, Spain
| | - Michael A Palladino
- Sierra Mesa Technologies, 3357 Fortuna Ranch Road, Encinitas, CA 92024, USA.
| | - Lisardo Boscá
- Instituto de Investigaciones Biomédicas Alberto Sols, Centro Mixto CSIC-UAM, Unidad Asociada Universidad de las Palmas de Gran Canaria, Arturo Duperier 4, 28029 Madrid, Spain.
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Zhang H, Li H, Xue J, Chen R, Li Y, Tang Y, Li C. New facile enantio- and diastereo-selective syntheses of (−)-triptonide and (−)-triptolide. Org Biomol Chem 2014; 12:732-6. [DOI: 10.1039/c3ob42183j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Bent bonds and the antiperiplanar hypothesis as a simple model to predict Diels–Alder reactivity: retrospective or perspective? Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.05.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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Amat M, Arioli F, Pérez M, Molins E, Bosch J. Preparation and Double Michael Addition Reactions of a Synthetic Equivalent of the Nazarov Reagent. Org Lett 2013; 15:2470-3. [DOI: 10.1021/ol400934c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mercedes Amat
- Laboratory of Organic Chemistry, Faculty of Pharmacy, and Institute of Biomedicine (IBUB), University of Barcelona, 08028-Barcelona, Spain, and Institut de Ciència de Materials (CSIC), Campus UAB, 08193-Cerdanyola, Spain
| | - Federica Arioli
- Laboratory of Organic Chemistry, Faculty of Pharmacy, and Institute of Biomedicine (IBUB), University of Barcelona, 08028-Barcelona, Spain, and Institut de Ciència de Materials (CSIC), Campus UAB, 08193-Cerdanyola, Spain
| | - Maria Pérez
- Laboratory of Organic Chemistry, Faculty of Pharmacy, and Institute of Biomedicine (IBUB), University of Barcelona, 08028-Barcelona, Spain, and Institut de Ciència de Materials (CSIC), Campus UAB, 08193-Cerdanyola, Spain
| | - Elies Molins
- Laboratory of Organic Chemistry, Faculty of Pharmacy, and Institute of Biomedicine (IBUB), University of Barcelona, 08028-Barcelona, Spain, and Institut de Ciència de Materials (CSIC), Campus UAB, 08193-Cerdanyola, Spain
| | - Joan Bosch
- Laboratory of Organic Chemistry, Faculty of Pharmacy, and Institute of Biomedicine (IBUB), University of Barcelona, 08028-Barcelona, Spain, and Institut de Ciència de Materials (CSIC), Campus UAB, 08193-Cerdanyola, Spain
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22
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Jiang CS, Liang LF, Guo YW. Natural products possessing protein tyrosine phosphatase 1B (PTP1B) inhibitory activity found in the last decades. Acta Pharmacol Sin 2012; 33:1217-45. [PMID: 22941286 PMCID: PMC4002712 DOI: 10.1038/aps.2012.90] [Citation(s) in RCA: 155] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Accepted: 06/08/2012] [Indexed: 12/19/2022] Open
Abstract
This article provides an overview of approximately 300 secondary metabolites with inhibitory activity against protein tyrosine phosphatase 1B (PTP1B), which were isolated from various natural sources or derived from synthetic process in the last decades. The structure-activity relationship and the selectivity of some compounds against other protein phosphatases were also discussed. Potential pharmaceutical applications of several PTP1B inhibitors were presented.
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Affiliation(s)
- Cheng-shi Jiang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Lin-fu Liang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Yue-wei Guo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
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23
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Lásiková A, Doháňošová J, Hlavínová L, Toffano M, Vo-Thanh G, Kožíšek J, Gracza T. Domino reaction: Pd(II)-catalyzed cyclization of unsaturated polyols and cross-coupling. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.tetasy.2012.05.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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24
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Deschamp J, Hermant T, Riant O. An easy route toward enantio-enriched polycyclic derivatives via an asymmetric domino conjugate reduction–aldol cyclization catalyzed by a chiral Cu(I) complex. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.07.039] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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25
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Rhee SW, Malerich JP, Lee JJ, Tanga MJ. Synthesis of 14C-acanthoic acid. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.2914] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sung-Whi Rhee
- Biosciences Division; SRI International; 333 Ravenswood Ave.; Menlo Park; CA; 94025-3135; USA
| | - Jeremiah P. Malerich
- Biosciences Division; SRI International; 333 Ravenswood Ave.; Menlo Park; CA; 94025-3135; USA
| | - Jung-Joon Lee
- Korea Research Institute of Bioscience and Biotechnology (KRIBB); 125 Gwahangno; Yuseong-gu; Daejon; Korea
| | - Mary J. Tanga
- Biosciences Division; SRI International; 333 Ravenswood Ave.; Menlo Park; CA; 94025-3135; USA
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26
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Xu J, Caro-Diaz EJE, Batova A, Sullivan SDE, Theodorakis EA. Formal synthesis of (-)-englerin A and cytotoxicity studies of truncated englerins. Chem Asian J 2012; 7:1052-60. [PMID: 22415793 DOI: 10.1002/asia.201101021] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Indexed: 02/02/2023]
Abstract
An efficient formal synthesis of (-)-englerin A (1) is reported. The target molecule is a recently isolated guaiane sesquiterpene that possesses highly potent and selective activity against renal cancer cell-lines. Our enantioselective strategy involved the construction of the BC ring system of compound 1 through a Rh(II)-catalyzed [4+3] cycloaddition reaction followed by subsequent attachment of the A ring through an intramolecular aldol condensation reaction. As such, this strategy allows the synthesis of truncated englerins. Evaluation of these analogues with the A498 renal cancer cell-line suggested that the A ring of englerin is crucial to its antiproliferative activity. Moreover, evaluation of these analogues led to the identification of potent growth-inhibitors of CEM cells with GI(50) values in the range 1-3 μM.
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Affiliation(s)
- Jing Xu
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC: 0358, La Jolla, CA 92093-0358, USA
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27
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Richard JA, Chen DYK. A Chiral-Pool-Based Approach to the Core Structure of (+)-Hyperforin. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101629] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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28
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Nguyen TX, Dakanali M, Trzoss L, Theodorakis EA. Enantioselective synthesis of the ABC ring motif of norzoanthamine based on asymmetric Robinson annulation reactions. Org Lett 2011; 13:3308-11. [PMID: 21615125 DOI: 10.1021/ol200966z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An enantioselective strategy for the synthesis of tetracyclic motif 5, representing the northern fragment of norzoanthamine, is presented. Key to the strategy is the use of two asymmetric Robinson annulation reactions that produce the tricyclic ABC ring system with excellent stereoselectivity. Further functionalization at the periphery of the C ring produces compound 5 containing six contiguous stereocenters of the natural product.
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Affiliation(s)
- Thong X Nguyen
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093-0358, USA
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29
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López JC, Plumet J. Metathesis Reactions of Carbohydrates: Recent Highlights in Alkyne Metathesis. European J Org Chem 2011. [DOI: 10.1002/ejoc.201001518] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- J. Cristóbal López
- Instituto de Química Orgánica General, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Joaquín Plumet
- Universidad Complutense, Facultad de Química, Departamento de Química Orgánica, Ciudad Universitaria s/n, 28040 Madrid, Spain, Fax: +34‐91‐394‐4103
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30
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Suwancharoen S, Tommeurd W, Phurat C, Muangsin N, Pornpakakul S. Acanthoic Acid. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o1531. [PMID: 21587780 PMCID: PMC3006772 DOI: 10.1107/s1600536810019483] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Accepted: 05/24/2010] [Indexed: 11/10/2022]
Abstract
The title compound [systematic name: (1R,4aR,7S,8aS,10aS)-1,4a,7-trimethyl-7-vinyl-1,2,3,4,4a,6,7,8,8a,9,10,10a-dodecahydrophenanthrene-1-carboxylic acid], C20H30O2, is a pimarane-type diterpene extracted from Croton oblongifolius. There are two independent molecules in the asymmetric unit. In both of these, the six-membered rings A, B and C adopt chair, boat and half-chair conformations, respectively. Rings A and B are trans-fused. The two molecules in the asymmetric unit form O—H⋯O hydrogen-bonded R22(8) dimers. The absolute configuration was assigned on the basis of the published literature on analogous structures.
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Affiliation(s)
- Sunisa Suwancharoen
- Research Centre of Bioorganic Chemistry, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
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31
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Hanessian S, Boyer N, Reddy GJ, Deschênes-Simard B. Total synthesis of oidiodendrolides and related norditerpene dilactones from a common precursor: metabolites CJ-14,445, LL-Z1271gamma, oidiolactones A, B, C, and D, and nagilactone F. Org Lett 2009; 11:4640-3. [PMID: 19778011 DOI: 10.1021/ol901896c] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient, high-yielding strategy has been developed for the asymmetric total synthesis of seven norditerpenoid dilactones known for their diverse biological properties. The three key steps employed to obtain a tricyclic lactone intermediate involved a Morita-Baylis-Hillman reaction, the stereocontrolled construction of a gamma-lactone through bromolactonization, and an efficient catalytic Reformatsky-type reaction. Access to CJ-14,445, LL-Z1271gamma, oidiolactones A, B, C, and D, and nagilactone F was possible from a common intermediate. Structures and stereochemistry were determined by X-ray analysis.
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Affiliation(s)
- Stephen Hanessian
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, Québec, H3C 3J7, Canada.
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32
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Hiroya K, Ichihashi Y, Furutono A, Inamoto K, Sakamoto T, Doi T. Development of Diastereoselective Birch Reduction−Alkylation Reactions of Bi- and Tricyclic β-Alkoxy-α,β-unsaturated Ketones. J Org Chem 2009; 74:6623-30. [DOI: 10.1021/jo901094x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kou Hiroya
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
| | - Yusuke Ichihashi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
| | - Ai Furutono
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
| | - Kiyofumi Inamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
| | - Takao Sakamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
| | - Takayuki Doi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
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33
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Deschamp J, Riant O. Efficient Construction of Polycyclic Derivatives via a Highly Selective CuI-Catalyzed Domino Reductive-Aldol Cyclization. Org Lett 2009; 11:1217-20. [DOI: 10.1021/ol802879f] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Julia Deschamp
- Unité de Chimie Organique et Médicinale, Université Catholique de Louvain, Place Louis Pasteur, 1 1348 Louvain-la-Neuve, Belgium
| | - Olivier Riant
- Unité de Chimie Organique et Médicinale, Université Catholique de Louvain, Place Louis Pasteur, 1 1348 Louvain-la-Neuve, Belgium
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34
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Selander N, Szabó K. Synthesis of Stereodefined Substituted Cycloalkenes by a One-Pot Catalytic Boronation-Allylation-Metathesis Sequence. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200800324] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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35
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Behenna DC, Stockdill JL, Stoltz BM. The biology and chemistry of the zoanthamine alkaloids. Angew Chem Int Ed Engl 2008; 47:2365-86. [PMID: 18307180 DOI: 10.1002/anie.200703172] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Marine natural products have long played an important role in natural products chemistry and drug discovery. Mirroring the rich variety and complicated interactions of the marine environment, the substances isolated from sea creatures tend to be incredibly diverse in both molecular structure and biological activity. The natural products isolated from the polyps of marine zoanthids are no exception. The zoanthamine alkaloids, the first of which were isolated over 20 years ago, are of particular interest to the synthetic community because they feature a novel structural framework and exhibit a broad range of biological activities. In this Review, we summarize the major contributions to understanding the zoanthamine natural products with regard to their isolation and structure determination, as well as studies on their biological activity and total synthesis.
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Affiliation(s)
- Douglas C Behenna
- The Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Boulevard, MC 164-30, Pasadena, CA 91125, USA
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36
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Behenna D, Stockdill J, Stoltz B. Biologie und Chemie der Zoanthamin-Alkaloide. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200703172] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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37
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Guillena G, Nájera C, Ramón DJ. Enantioselective direct aldol reaction: the blossoming of modern organocatalysis. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.09.025] [Citation(s) in RCA: 311] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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38
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Valla A, Valla B, Le Guillou R, Cartier D, Dufossé L, Labia R. New Syntheses of Retinal and Its Acyclic Analogγ-Retinal by an Extended Aldol Reaction with a C6 Building Block That Incorporates a C5 Unit after Decarboxylation. A Formal Route to Lycopene andβ-Carotene. Helv Chim Acta 2007. [DOI: 10.1002/hlca.200790053] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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39
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Hosseini M, Stiasni N, Barbieri V, Kappe CO. Microwave-Assisted Asymmetric Organocatalysis. A Probe for Nonthermal Microwave Effects and the Concept of Simultaneous Cooling. J Org Chem 2007; 72:1417-24. [PMID: 17288387 DOI: 10.1021/jo0624187] [Citation(s) in RCA: 170] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of five known asymmetric organocatalytic reactions was re-evaluated at elevated temperatures applying both microwave dielectric heating and conventional thermal heating in order to probe the existence of specific or nonthermal microwave effects. All transformations were conducted in a dedicated reactor setup that allowed accurate internal reaction temperature measurements using fiber-optic probes. In addition, the concept of simultaneous external cooling while irradiating with microwave power was also applied in all of the studied cases. This method allows a higher level of microwave power to be administered to the reaction mixture and, therefore, enhances any potential microwave effects while continuously removing heat. For all of the five studied (S)-proline-catalyzed asymmetric Mannich- and aldol-type reactions, the observed rate enhancements were a consequence of the increased temperatures attained by microwave dielectric heating and were not related to the presence of the microwave field. In all cases, in contrast to previous literature reports, the results obtained either with microwave irradiation or with microwave irradiation with simultaneous cooling could be reproduced by conventional heating at the same reaction temperature and time in an oil bath. No evidence for specific or nonthermal microwave effects was obtained.
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Affiliation(s)
- Masood Hosseini
- Christian Doppler Laboratory for Microwave Chemistry (CDLMC) and Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstrasse 28, A-8010 Graz, Austria
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An efficient route for the synthesis of methyl (−)-1,4a-dimethyl-5-oxodecahydronaphthalene-1-carboxylate by using baker’s yeast-catalyzed asymmetric reduction. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.06.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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41
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Chaudhury S, Li S, Donaldson WA. Synthetic studies directed toward the proposed structure for heteroscyphic acid A. Chem Commun (Camb) 2006:2069-70. [PMID: 16767278 DOI: 10.1039/b602700h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A route to the carbon skeleton of the proposed structure for heteroscyphic acid A was developed utilizing a Mn(III)/Cu(II) mediated oxidative free-radical cyclization and nucleophilic addition to (3-methylpentadienyl)iron(1+) cation.
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Affiliation(s)
- Subhabrata Chaudhury
- Department of Chemistry, Marquette University, P. O. Box 1881, Milwaukee, WI 53201-1881, USA
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42
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Waters SP, Tian Y, Li YM, Danishefsky SJ. Total synthesis of (-)-scabronine G, an inducer of neurotrophic factor production. J Am Chem Soc 2006; 127:13514-5. [PMID: 16190712 DOI: 10.1021/ja055220x] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The total synthesis of (-)-scabronine G has been achieved in a concise manner from the (-)-Wieland-Miescher ketone. Scabronine G and its more potent methyl ester (also prepared) display activity as nonpeptidyl inducers of nerve growth factor production.
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Affiliation(s)
- Stephen P Waters
- Laboratory for Bioorganic Chemistry and Laboratory of Biochemistry and Pharmacology, Sloan-Kettering Institute for Cancer Research, New York, New York 10021, USA
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Kasai Y, Shimanuki K, Kuwahara S, Watanabe M, Harada N. Preparation of enantiopure Wieland–Miescher ketone and derivatives by the MαNP acid method. Substituent effect on the HPLC separation. Chirality 2006; 18:177-87. [PMID: 16432916 DOI: 10.1002/chir.20236] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Enantiopure Wieland-Miescher ketone (4, W-M ketone) and derivatives were prepared by the enantioresolution with 2-methoxy-2-(1-naphthyl)propionic acid (MalphaNP acid 1). Various racemic derivatives of 4 were esterified with acid (S)-(+)-1 yielding diastereomeric MalphaNP esters, which were separated by HPLC on silica gel. It was clarified that the HPLC separation of diastereomers depended on the substituent of the derivatives, leading to the working hypothesis that MalphaNP acid esters of alcohols with less polar and more bulky aliphatic substituents are more effectively separated. The best separation was obtained in the case of tert-butyldimethylsilyl (TBDMS) ether derivative (12a/12b): separation factor alpha=1.80, and resolution factor, Rs=1.30. The (1)H NMR spectra of separated MalphaNP esters showed anomalously large magnetic anisotropy effects, from which their absolute configurations were determined. Solvolysis or reduction of the separated MalphaNP esters yielded alcohols, which were converted to enantiopure W-M ketones 4. The results thus provided another route for preparation of enantiopure ketones (8aR)-(-)-4 and (8aS)-(+)-4.
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Affiliation(s)
- Yusuke Kasai
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
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44
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Jayasuriya H, Herath KB, Ondeyka JG, Guan Z, Borris RP, Tiwari S, de Jong W, Chavez F, Moss J, Stevenson DW, Beck HT, Slattery M, Zamora N, Schulman M, Ali A, Sharma N, MacNaul K, Hayes N, Menke JG, Singh SB. Diterpenoid, steroid, and triterpenoid agonists of liver X receptors from diversified terrestrial plants and marine sources. JOURNAL OF NATURAL PRODUCTS 2005; 68:1247-52. [PMID: 16124770 DOI: 10.1021/np050182g] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
It has been demonstrated that liver X receptors (LXR) play a significant role in cholesterol homeostasis. Agonists of LXR are expected to increase cellular cholesterol efflux, lower LDL, and raise HDL levels. Screening of a natural product library of plant extracts using a LXR-SPA binding assay and bioassay-guided fractionation of a number of plant and marine gorgonian extracts led to the isolation of a number of active compounds. These included acanthoic acid (1) and alcohol (2), viperidone (3), polycarpol (4), rosacea acid (5), a cycloartane derivative (6), a new cycloartane analogue (7), betulinic acid (8), and gorgostane derivatives (9, 10, and 11). Of these compounds, 1, 4, and 11 exhibited potent binding affinity for alpha-receptor with IC(50) values of 0.25, 0.12, and 0.07 microM, respectively. Functionally they also showed strong coactivator association stimulation for LXRalpha receptor with EC50 values of 0.18, 0.03, and 0.05 microM, respectively. They also exhibited 15-, 8-, and 13-fold induction of the alpha-receptor in a transactivation assay in HEK-293 cells, respectively. In general these compounds were selective for the LXR alpha-receptor over the beta-receptor in all assays and were much better stimulators of the alpha-receptor than the endogenous steroid ligands.
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45
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Ottolina G, de Gonzalo G, Carrea G, Danieli B. Enzymatic Baeyer-Villiger Oxidation of Bicyclic Diketones. Adv Synth Catal 2005. [DOI: 10.1002/adsc.200505027] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Felzmann W, Gmeiner G, Gärtner P. First synthesis of a pentadeuterated 3'-hydroxystanozolol--an internal standard in doping analysis. Steroids 2005; 70:103-10. [PMID: 15631866 DOI: 10.1016/j.steroids.2004.10.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2004] [Revised: 10/05/2004] [Accepted: 10/11/2004] [Indexed: 11/15/2022]
Abstract
The first synthesis of 16,16,20,20,20-pentadeuterio-3'-hydroxystanozolol (8) in 26% yield over nine steps is described using moderately priced starting materials and economic amounts of reagents. Compound 8 can be used as an internal standard in screening procedures for anabolic steroids as well as for the quantification of stanozolol metabolites via mass spectrometric techniques, such as LC-MS or gas chromatography-mass spectrometry (GC-MS).
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Affiliation(s)
- Wolfgang Felzmann
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
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Hiroya K, Takahashi T, Shimomae K, Sakamoto T. The New Method for Introduction of an Allyl Group into the Angular Position of 2-(TBS-oxymethyl)-2,3,4,6,7,8-hexahydro-1-benzopyran-5-one and Its Application to Chiral Wieland-Miescher Type Compound Synthesis. Chem Pharm Bull (Tokyo) 2005; 53:207-13. [PMID: 15684520 DOI: 10.1248/cpb.53.207] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The stereoselective introduction of an allyl group into the angular position of 2-(TBS-oxymethyl)-2,3,4,6,7,8-hexahydro-1-benzopyran-5-one was accomplished using Birch reduction and an enolate trapping reaction. It was determined that the allyl group was introduced via an unexpected conformation-flipped from the initially formed one. Two diastereomeric Wieland-Miescher type compounds, having the allyl group at the angular position, were synthesized as optically pure forms.
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Affiliation(s)
- Kou Hiroya
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan.
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Chao TH, Lam T, Vong BG, Través PG, Hortelano S, Chowdhury C, Bahjat FR, Lloyd GK, Moldawer LL, Boscá L, Palladino MA, Theodorakis EA. A new family of synthetic diterpenes that regulates cytokine synthesis by inhibiting IkappaBalpha phosphorylation. Chembiochem 2005; 6:133-44. [PMID: 15540220 DOI: 10.1002/cbic.200400089] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The synthesis and the biological evaluation of a new family diterpenes are presented. The synthetic studies were inspired by the structural framework of acanthoic acid (1) and yielded a family of compounds that were evaluated as anti-inflammatory agents. Among them, compounds 2, 10, 12, and 16 exhibited a very low nonspecific cytotoxicity and inhibited the synthesis of TNF-alpha with greater than 65 % efficacy at low micromolar concentrations. Cytokine-specificity studies revealed that these compounds also inhibited the synthesis of the proinflammatory cytokines IL-1beta and IL-6, while inhibition of IL-1ra and IL-8 synthesis was marginal and only occurred at high concentrations. Further studies, through EMSA and Western blot analyses, indicated that these compounds decreased the extent of phosphorylation of IkappaBalpha; this suggests that they exert their anti-inflammatory profile by inhibiting NF-kappaB-mediated cytokine synthesis. These findings imply that these diterpenes represent promising leads for the development of novel anti-inflammatory agents.
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Affiliation(s)
- Ta-Hsiang Chao
- Nereus Pharmaceuticals, Inc, 10480 Wateridge Circle, San Diego, CA 92121, USA
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Inomata K, Barragué M, Paquette LA. Diastereoselectivities Realized in the Amino Acid Catalyzed Aldol Cyclizations of Triketo Acetonides of Differing Ring Size. J Org Chem 2004; 70:533-9. [PMID: 15651798 DOI: 10.1021/jo0486084] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A study designed to assess the diastereoselectivity of the intramolecular aldol reaction of two differently sized monocyclic 1,3-diketones bearing a chiral, oxygenated side chain has been undertaken. The cyclizations were brought about under catalysis by pyrrolidine, a series of D- and L-amino acids including proline, and several proline derivatives. The levels of selectivity were found to be consistently higher with the six-membered ring system than its cycloheptane counterpart.
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Affiliation(s)
- Kohei Inomata
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210, USA
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