1
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Yuan C, Sun S, Wang G, Sun S, Wang J. Access to 8-Azabicyclo[3,2,1]octanes via the [3 + 2] Cycloaddition of Oxidopyridinium Ions to Maleimides. J Org Chem 2023. [PMID: 37267429 DOI: 10.1021/acs.joc.3c00406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Herein, we reported a unique and operationally simple method to assemble 8-azabicyclo[3,2,1]octanes by using oxidopyridinium ions and maleimides as synthons. The features of good to high yields and good functional group tolerance are achieved regularly under mild conditions. Of note, oxidopyridinium ions undergo a [3 + 2] cycloaddition on their C2 and C6 positions.
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Affiliation(s)
- Cheng Yuan
- Hubei Key Laboratory of Radiation Chemistry and Functional Materials, Non-power Nuclear Technology Collaborative Innovation Center, School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, Xianning 437100, China
| | - Sheng Sun
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Gangqiang Wang
- Hubei Key Laboratory of Radiation Chemistry and Functional Materials, Non-power Nuclear Technology Collaborative Innovation Center, School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, Xianning 437100, China
| | - Shaofa Sun
- Hubei Key Laboratory of Radiation Chemistry and Functional Materials, Non-power Nuclear Technology Collaborative Innovation Center, School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, Xianning 437100, China
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Jian Wang
- Hubei Key Laboratory of Radiation Chemistry and Functional Materials, Non-power Nuclear Technology Collaborative Innovation Center, School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, Xianning 437100, China
- School of Pharmaceutical Sciences, Tsinghua University, Beijing 100084, China
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2
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Sungnoi W, Harmata M. Oxidative bridgehead functionalization of (4 + 3) cycloadducts obtained from oxidopyridinium ions. RSC Adv 2022; 12:28572-28575. [PMID: 36320531 PMCID: PMC9536252 DOI: 10.1039/d2ra05189c] [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] [Received: 08/18/2022] [Accepted: 09/08/2022] [Indexed: 11/06/2022] Open
Abstract
Treatment of selected (4 + 3) cycloadducts derived from oxidopyridinium ions with N-iodosuccinimide (NIS) in hexafluoroisopropanol (HFIP) resulted in the formation of bridgehead ethers via a net oxidative C-H activation.
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Affiliation(s)
- Wanna Sungnoi
- Department of Chemistry, University of Missouri-ColumbiaColumbiaMissouri 65211USA
| | - Michael Harmata
- Department of Chemistry, University of Missouri-ColumbiaColumbiaMissouri 65211USA
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3
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Tu J, Ripa RA, Kelley SP, Harmata M. Intramolecular (4+3) Cycloadditions of Oxidopyridinium Ions: Towards Daphnicyclidin A. Chemistry 2022; 28:e202200370. [PMID: 35612968 DOI: 10.1002/chem.202200370] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Indexed: 12/15/2022]
Abstract
N-alkylation of 5-hydroxynicotinic acid esters with electrophiles containing diene functionality produces salts that undergo intramolecular (4+3) cycloaddition reactions upon heating in the presence of base. Initial studies used a three-carbon tether to join the pyridinium ion and diene, revealing some aspects of the inherent selectivity of the reaction with such substrates. Much more challenging was the synthesis of related species possessing only a two-carbon tether. Nevertheless, the cycloaddition of such compounds was successful, leading directly to the ABC ring system of the alkaloid daphnicyclidin A.
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Affiliation(s)
- Jianzhuo Tu
- Department of Chemistry, University of Missouri-Columbia, 601 S. College Avenue, Columbia, Missouri, 65211, USA
| | - Rawshan A Ripa
- Department of Chemistry, University of Missouri-Columbia, 601 S. College Avenue, Columbia, Missouri, 65211, USA
| | - Steven P Kelley
- Department of Chemistry, University of Missouri-Columbia, 601 S. College Avenue, Columbia, Missouri, 65211, USA
| | - Michael Harmata
- Department of Chemistry, University of Missouri-Columbia, 601 S. College Avenue, Columbia, Missouri, 65211, USA
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4
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Tanpure SD, Kuo TC, Cheng MJ, Liu RS. Gold(I)-Catalyzed Highly Diastereo- and Enantioselective Constructions of Bicyclo[3.2.1]oct-6-ene Frameworks via (4 + 3)-Cycloadditions. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04483] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Sudhakar Dattatray Tanpure
- Frontier Research Center for Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu 300, Taiwan, ROC
| | - Tung-Chun Kuo
- Department of Chemistry, National Cheng Kung University, East District, Tainan City 701, Taiwan, ROC
| | - Mu-Jeng Cheng
- Department of Chemistry, National Cheng Kung University, East District, Tainan City 701, Taiwan, ROC
| | - Rai-Shung Liu
- Frontier Research Center for Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu 300, Taiwan, ROC
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5
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Sungnoi W, Keto AB, Roseli RB, Liu J, Wang H, Fu C, Regalado EL, Krenske EH, Harmata M. Endo Selectivity in the (4 + 3) Cycloaddition of Oxidopyridinium Ions. Org Lett 2021; 23:8302-8306. [PMID: 34637313 DOI: 10.1021/acs.orglett.1c03028] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The (4 + 3) cycloaddition of 2-trialkylsilyl-4-alkylbutadienes with an N-methyloxidopyridinium ion affords cycloadducts with high regioselectivity and excellent endo selectivity.
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Affiliation(s)
- Wanna Sungnoi
- Department of Chemistry, University of Missouri─Columbia, Columbia, Missouri 65211, United States
| | - Angus B Keto
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Ras Baizureen Roseli
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Jinchu Liu
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Heather Wang
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Chencheng Fu
- Department of Chemistry, University of Missouri─Columbia, Columbia, Missouri 65211, United States
| | - Erik L Regalado
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Elizabeth H Krenske
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Michael Harmata
- Department of Chemistry, University of Missouri─Columbia, Columbia, Missouri 65211, United States
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6
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Fu C, Kelley SP, Tu J, Harmata M. Generation of the 7-Azabicyclo[4.3.1]decane Ring System via (4 + 3) Cycloaddition of Oxidopyridinium Ions. J Org Chem 2021; 86:7028-7037. [PMID: 33947183 DOI: 10.1021/acs.joc.1c00032] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Oxidopyridinium ions bearing an ester group at the 5-position undergo (4 + 3) cycloaddition reaction to afford congeners of 7-azabicyclo[4.3.1]decane. The reaction generally proceeds in high yield, although an excess of diene is often required to achieve such yields. The reaction is highly regioselective, but not endo/exo selective. It appears the cycloaddition process can be either kinetically or thermodynamically controlled, depending on the nature of the diene used and the reaction time. An intramolecular Heck reaction was used to demonstrate that some chemistry is possible with the cycloadducts.
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Affiliation(s)
- Chencheng Fu
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, United States
| | - Steven P Kelley
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, United States
| | - Jianzhuo Tu
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, United States
| | - Michael Harmata
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, United States
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7
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Hu XN, Wu DP, Xu YP, Huang PQ. Organocatalytic Asymmetric Synthesis of an Advanced Intermediate of (+)-Sarain A. Chemistry 2021; 27:609-613. [PMID: 33044771 DOI: 10.1002/chem.202004261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 10/11/2020] [Indexed: 12/13/2022]
Abstract
The first organocatalytic asymmetric synthesis of an advanced intermediate of (+)-sarain A was achieved. This approach featured the employment of an organocatalytic asymmetric Michael addition reaction and a nitrogen-to-carbon chirality transfer to forge three chiral centers, as well as a catalytic hydrosilylation for the chemoselective reduction of a key lactam intermediate. The tricyclic intermediate contained all the required functionalities for elaborating into (+)-sarain A.
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Affiliation(s)
- Xiu-Ning Hu
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, P. R. China
| | - Dong-Ping Wu
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, P. R. China
| | - Ye-Peng Xu
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, P. R. China
| | - Pei-Qiang Huang
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, P. R. China
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8
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Yokoshima S. Synthesis of 2-Azabicyclo[3.3.1]nonanes: Lessons from Synthetic Studies of Macrocyclic Diamine Alkaloids. CHEM LETT 2021. [DOI: 10.1246/cl.200695] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Satoshi Yokoshima
- Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
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9
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Luo S, Huang X, Guo L, Huang P. Catalytic Asymmetric Total Synthesis of Macrocyclic Marine Natural Product (–)‐Haliclonin A
†. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.202000291] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Shi‐Peng Luo
- Department of Chemistry and The Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University Xiamen Fujian 361005 China
- School of Chemistry and Environmental Engineering, Jiangsu University of Technology Changzhou Jiangsu 213001 China
| | - Xiong‐Zhi Huang
- Department of Chemistry and The Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University Xiamen Fujian 361005 China
| | - Lian‐Dong Guo
- Department of Chemistry and The Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University Xiamen Fujian 361005 China
| | - Pei‐Qiang Huang
- Department of Chemistry and The Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University Xiamen Fujian 361005 China
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10
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Abstract
Amongst nitrogen heterocycles of different ring sizes and oxidation statuses, dihydropyridines (DHP) occupy a prominent role due to their synthetic versatility and occurrence in medicinally relevant compounds. One of the most straightforward synthetic approaches to polysubstituted DHP derivatives is provided by nucleophilic dearomatization of readily assembled pyridines. In this article, we collect and summarize nucleophilic dearomatization reactions of - pyridines reported in the literature between 2010 and mid-2018, complementing and updating previous reviews published in the early 2010s dedicated to various aspects of pyridine chemistry. Since functionalization of the pyridine nitrogen, rendering a (transient) pyridinium ion, is usually required to render the pyridine nucleus sufficiently electrophilic to suffer the attack of a nucleophile, the material is organized according to the type of N-functionalization. A variety of nucleophilic species (organometallic reagents, enolates, heteroaromatics, umpoled aldehydes) can be productively engaged in pyridine dearomatization reactions, including catalytic asymmetric implementations, providing useful and efficient synthetic platforms to (enantioenriched) DHPs. Conversely, pyridine nitrogen functionalization can also lead to pyridinium ylides. These dipolar species can undergo a variety of dipolar cycloaddition reactions with electron-poor dipolarophiles, affording polycyclic frameworks and embedding a DHP moiety in their structures.
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11
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Wang Y, Leng L, Liu Y, Dai G, Xue F, Chen Z, Meng J, Wen G, Xiao Y, Liu XY, Qin Y. Asymmetric Synthesis of an Advanced Tetracyclic Framework of (+)-Sarain A. Org Lett 2018; 20:6701-6704. [PMID: 30346782 DOI: 10.1021/acs.orglett.8b02779] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Yu Wang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Lingying Leng
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Ying Liu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Guiying Dai
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Fanglin Xue
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Zhihao Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Jiao Meng
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Guohua Wen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Yaxin Xiao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Xiao-Yu Liu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Yong Qin
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
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12
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Affiliation(s)
- Hélène Pellissier
- Aix Marseille Univ, CNRS; Centrale Marseille, iSm2 13397 Marseille France
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13
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Yin Z, He Y, Chiu P. Application of (4+3) cycloaddition strategies in the synthesis of natural products. Chem Soc Rev 2018; 47:8881-8924. [DOI: 10.1039/c8cs00532j] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This review summarizes the applications of (4+3) cycloadditions, both classical and formal, in the syntheses of natural products in the last two decades.
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Affiliation(s)
- Zengsheng Yin
- Department of Chemistry
- State Key Laboratory of Synthetic Chemistry
- The University of Hong Kong
- P. R. China
| | - Yun He
- Department of Chemistry
- State Key Laboratory of Synthetic Chemistry
- The University of Hong Kong
- P. R. China
| | - Pauline Chiu
- Department of Chemistry
- State Key Laboratory of Synthetic Chemistry
- The University of Hong Kong
- P. R. China
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14
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Fu C, Lora N, Kirchhoefer PL, Lee DR, Altenhofer E, Barnes CL, Hungerford NL, Krenske EH, Harmata M. (4+3) Cycloaddition Reactions of N‐Alkyl Oxidopyridinium Ions. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708320] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Chencheng Fu
- Department of Chemistry University of Missouri-Columbia Columbia MO 65211 USA
| | - Nestor Lora
- Department of Chemistry University of Missouri-Columbia Columbia MO 65211 USA
| | | | - Dong Reyoul Lee
- Department of Chemistry University of Missouri-Columbia Columbia MO 65211 USA
| | - Erich Altenhofer
- Department of Chemistry University of Missouri-Columbia Columbia MO 65211 USA
| | - Charles L. Barnes
- Department of Chemistry University of Missouri-Columbia Columbia MO 65211 USA
| | - Natasha L. Hungerford
- School of Chemistry and Molecular Biosciences The University of Queensland Brisbane QLD 4072 Australia
| | - Elizabeth H. Krenske
- School of Chemistry and Molecular Biosciences The University of Queensland Brisbane QLD 4072 Australia
| | - Michael Harmata
- Department of Chemistry University of Missouri-Columbia Columbia MO 65211 USA
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15
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Fu C, Lora N, Kirchhoefer PL, Lee DR, Altenhofer E, Barnes CL, Hungerford NL, Krenske EH, Harmata M. (4+3) Cycloaddition Reactions of N-Alkyl Oxidopyridinium Ions. Angew Chem Int Ed Engl 2017; 56:14682-14687. [PMID: 28929559 DOI: 10.1002/anie.201708320] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Indexed: 11/07/2022]
Abstract
N-Methylation of methyl 5-hydroxynicotinate followed by reaction with a diene in the presence of triethylamine afforded (4+3) cycloadducts in good to excellent yields. High regioselectivity was observed with 1-substituted and 1,2-disubstituted butadienes. Density functional theory calculations indicate that the cycloaddition involves concerted addition of the diene onto the oxidopyridinium ion. The process provides rapid access to bicyclic nitrogenous structures resembling natural alkaloids.
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Affiliation(s)
- Chencheng Fu
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO, 65211, USA
| | - Nestor Lora
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO, 65211, USA
| | | | - Dong Reyoul Lee
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO, 65211, USA
| | - Erich Altenhofer
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO, 65211, USA
| | - Charles L Barnes
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO, 65211, USA
| | - Natasha L Hungerford
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Elizabeth H Krenske
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Michael Harmata
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO, 65211, USA
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16
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Meng J, Wang Y, Qin Y, Liu XY. Asymmetric synthetic approach to a functionalized azabicyclo[3.3.1]nonane moiety of (+)-sarain A. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.09.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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17
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Yeh MCP, Chang YM, Lin HH. Stereoselective Synthesis of 7-(E
)-Arylidene-2-chloro-6-azabicyclo[3.2.1]octanes via
Aluminum Chloride-Promoted Cyclization/Chlorination of Six-Membered Ring 3-Enynamides. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700271] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ming-Chang P. Yeh
- Department of Chemistry; National Taiwan Normal University; 88 Ding-Jou Road, Sec. 4 Taipei 11677 Taiwan, R.O.C
| | - Yi-Mei Chang
- Department of Chemistry; National Taiwan Normal University; 88 Ding-Jou Road, Sec. 4 Taipei 11677 Taiwan, R.O.C
| | - Hsin-Hui Lin
- Department of Chemistry; National Taiwan Normal University; 88 Ding-Jou Road, Sec. 4 Taipei 11677 Taiwan, R.O.C
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18
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Krüger S, Gaich T. Total Syntheses of Vellosimine,N-Methylvellosimine, and 10-Methoxyvellosimine and Formal Synthesis of 16-Epinormacusine B through a [5+2] Cycloaddition. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600870] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sebastian Krüger
- Institut für Organische Chemie; Leibniz Universität Hannover; Schneiderberg 1 B 30167 Hannover Germany
| | - Tanja Gaich
- Lehrstuhl für Organische Chemie; Universität Konstanz; Universitätsstr. 10 78457 Konstanz Germany
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19
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Higo T, Ukegawa T, Yokoshima S, Fukuyama T. Formal Synthesis of Sarain A: Intramolecular Cycloaddition of an Eight-Membered Cyclic Nitrone to Construct the 2-Azabicyclo[3.3.1]nonane Framework. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201501633] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Higo T, Ukegawa T, Yokoshima S, Fukuyama T. Formal Synthesis of Sarain A: Intramolecular Cycloaddition of an Eight-Membered Cyclic Nitrone to Construct the 2-Azabicyclo[3.3.1]nonane Framework. Angew Chem Int Ed Engl 2015; 54:7367-70. [DOI: 10.1002/anie.201501633] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Indexed: 11/10/2022]
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21
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He S, Hsung RP, Presser W, Ma ZX, Haugen BJ. An approach to cyclohepta[b]indoles through an allenamide (4 + 3) cycloaddition-Grignard cyclization-Chugaev elimination sequence. Org Lett 2014; 16:2180-3. [PMID: 24701990 PMCID: PMC3998770 DOI: 10.1021/ol5006455] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Indexed: 11/30/2022]
Abstract
A strategy for synthesizing highly functionalized cyclohepta[b]indoles through a concise (4 + 3) cycloaddition-cyclization-elimination sequence is described. The cycloaddition features nitrogen-stabilized oxyallyl cations derived from epoxidations of N-aryl-N-sulfonyl-substituted allenamides, while the cyclization and elimination employed an intramolecular Grignard addition and a one-step Chugaev process, respectively.
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Affiliation(s)
- Shuzhong He
- Division
of Pharmaceutical
Sciences, School of Pharmacy, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Richard P. Hsung
- Division
of Pharmaceutical
Sciences, School of Pharmacy, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - William
R. Presser
- Division
of Pharmaceutical
Sciences, School of Pharmacy, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Zhi-Xiong Ma
- Division
of Pharmaceutical
Sciences, School of Pharmacy, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Bryan J. Haugen
- Division
of Pharmaceutical
Sciences, School of Pharmacy, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States
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22
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Abstract
Saraines have been isolated by the group of Cimino from the marine sponge Reniera sarai collected in the Bay of Naples. These alkaloids can be classified into two categories, depending on the type of their structure. Saraines 1-3 and isosaraines 1-3 are characterized by a trans-2-oxoquinolizidine moiety bound directly to a tetrahydropyridine ring, both nuclei being also linked by two alkyl chains of different lengths. On the other hand, saraines A-C and misenine present a diazatricyclic central core, showing an unusual interaction between an aldehyde and a tertiary amine and giving them a zwitterionic character, and flanked with two chains forming macrocycles. In a first part of the chapter, the isolation, spectral data, and structure elucidation of saraines are presented. Biological properties and biogenetic proposals concerning these compounds are then described. The most important part is devoted to synthetic approaches and total synthesis of saraine A.
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23
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Presset M, Coquerel Y, Rodriguez J. Syntheses and Applications of Functionalized Bicyclo[3.2.1]octanes: Thirteen Years of Progress. Chem Rev 2012; 113:525-95. [DOI: 10.1021/cr200364p] [Citation(s) in RCA: 129] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Marc Presset
- Aix Marseille
Université, CNRS,
iSm2 UMR 7313, 13397 Marseille, France
| | - Yoann Coquerel
- Aix Marseille
Université, CNRS,
iSm2 UMR 7313, 13397 Marseille, France
| | - Jean Rodriguez
- Aix Marseille
Université, CNRS,
iSm2 UMR 7313, 13397 Marseille, France
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24
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Ren H, Wu C, Ding X, Chen X, Shi F. Aryne cycloaddition with 3-oxidopyridinium species. Org Biomol Chem 2012; 10:8975-84. [DOI: 10.1039/c2ob26519b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Peixoto S, Martin MT, Crich D, Delpech B, Marazano C. Concise Construction of Sarain A Core According to a Biosynthetic Proposal: Cyclization through an Intramolecular Mannich-type Reaction Involving an Endocyclic N-Acyliminium ion. Chemistry 2011; 17:9907-10. [DOI: 10.1002/chem.201101783] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Indexed: 11/12/2022]
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26
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Lohse AG, Hsung RP, Leider MD, Ghosh SK. Developing a diastereoselective intramolecular [4+3] cycloaddition of nitrogen-stabilized oxyallyl cations derived from N-sulfonyl-substituted allenamides. J Org Chem 2011; 76:3246-57. [PMID: 21449577 PMCID: PMC3095656 DOI: 10.1021/jo200147h] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Efforts toward achieving a practical and diastereoselective intramolecular [4+3] cycloaddition of nitrogen-stabilized oxyallyl cations with tethered dienes are described. Epoxidation of N-sulfonyl substituted allenamides with dimethyldioxirane (DMDO) generates nitrogen-stabilized oxyallyl cations that readily undergo stereoselective [4+3] cycloaddition with dienes. Selectivity is found to depend on the tethering length as well as the stability of the oxyallyl cation intermediate, whether generated from N-carbamoyl- or N-sulfonyl-substituted allenamides. The use of chiral N-sulfonyl-substituted allenamides provided minimal diastereoselectivity in the cycloaddition, while high diastereoselectivity can be achieved with a stereocenter present on the tether. These studies provide further support for the synthetic utility of allenamides.
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Affiliation(s)
- Andrew G. Lohse
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705
| | - Mitchell D. Leider
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705
| | - Sunil K. Ghosh
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705
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27
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Roche SP, Porco JA. Dearomatization strategies in the synthesis of complex natural products. Angew Chem Int Ed Engl 2011; 50:4068-93. [PMID: 21506209 PMCID: PMC4136767 DOI: 10.1002/anie.201006017] [Citation(s) in RCA: 997] [Impact Index Per Article: 76.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2010] [Indexed: 11/11/2022]
Abstract
Evolution in the field of the total synthesis of natural products has led to exciting developments over the last decade. Numerous chemoselective and enantioselective methodologies have emerged from total syntheses, resulting in efficient access to many important natural product targets. This Review highlights recent developments concerning dearomatization, a powerful strategy for the total synthesis of architecturally complex natural products wherein planar, aromatic scaffolds are converted to three-dimensional molecular architectures.
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Affiliation(s)
- Stéphane P. Roche
- Department of Chemistry, Center for Chemical Methodology and Library Development, Boston University 590 Commonwealth Avenue, Boston, MA 02215 (USA)
| | - John A. Porco
- Department of Chemistry, Center for Chemical Methodology and Library Development, Boston University 590 Commonwealth Avenue, Boston, MA 02215 (USA)
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28
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Roche SP, Porco JA. Desaromatisierungsstrategien in der Synthese strukturell komplexer Naturstoffe. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201006017] [Citation(s) in RCA: 314] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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29
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Lohse AG, Hsung RP. (4+3) cycloaddition reactions of nitrogen-stabilized oxyallyl cations. Chemistry 2011; 17:3812-22. [PMID: 21384451 DOI: 10.1002/chem.201100260] [Citation(s) in RCA: 191] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The use of heteroatom-substituted oxyallyl cations in (4+3) cycloadditions has had a tremendous impact on the development of cycloaddition chemistry. Extensive efforts have been exerted toward investigating the effect of oxygen, sulfur, and halogen substituents on the reactivity of oxyallyl cations. Most recently, the use of nitrogen-stabilized oxyallyl cations has gained prominence in the area of (4+3) cycloadditions. The following article will provide an overview of this concept utilizing nitrogen-stabilized oxyallyl cations.
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Affiliation(s)
- Andrew G Lohse
- Division of Pharmaceutical Sciences, Department of Chemistry, University of Wisconsin, Madison, Madison, WI 53705, USA
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30
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31
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Franklin AI, Bensa D, Adams H, Coldham I. Transannular dipolar cycloaddition as an approach towards the synthesis of the core ring system of the sarain alkaloids. Org Biomol Chem 2011; 9:1901-7. [DOI: 10.1039/c0ob01019g] [Citation(s) in RCA: 19] [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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32
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Harmata M. The (4+3)-cycloaddition reaction: heteroatom-substituted allylic cations as dienophiles. Chem Commun (Camb) 2010; 46:8904-22. [PMID: 21063614 DOI: 10.1039/c0cc03621h] [Citation(s) in RCA: 201] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Michael Harmata
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA.
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33
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Lohse AG, Hsung RP. Thermal intramolecular [4 + 2] cycloadditions of allenamides: a stereoselective tandem propargyl amide isomerization-cycloaddition. Org Lett 2009; 11:3430-3. [PMID: 19591454 DOI: 10.1021/ol901283m] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A stereoselective intramolecular normal demand [4 + 2] cycloaddition of allenamides under thermal conditions without metal assistance is described. This work led to the development of a stereoselective tandem propargyl amide-isomerization-[4 + 2] cycloaddition sequence amenable for rapid assembly of complex nitrogen heterocycles.
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Affiliation(s)
- Andrew G Lohse
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA
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34
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Jang KH, Kang GW, Jeon JE, Lim C, Lee HS, Sim CJ, Oh KB, Shin J. Haliclonin A, a New Macrocyclic Diamide from the Sponge Haliclona sp. Org Lett 2009; 11:1713-6. [DOI: 10.1021/ol900282m] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kyoung Hwa Jang
- Natural Products Research Institute, College of Pharmacy, Seoul National University, San 56-1, Sillim, Seoul 151-742, Korea, Marine Natural Products Laboratory, Korea Ocean Research and Development Institute, Ansan P.O. Box 29, Seoul 425-600, Korea, Department of Biological Science, College of Life Science and Nano Technology, Hannam University,461-6 Jeonmin, Yuseong, Daejeon 305-811, Korea, and Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University,
| | - Gyoung Won Kang
- Natural Products Research Institute, College of Pharmacy, Seoul National University, San 56-1, Sillim, Seoul 151-742, Korea, Marine Natural Products Laboratory, Korea Ocean Research and Development Institute, Ansan P.O. Box 29, Seoul 425-600, Korea, Department of Biological Science, College of Life Science and Nano Technology, Hannam University,461-6 Jeonmin, Yuseong, Daejeon 305-811, Korea, and Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University,
| | - Ju-eun Jeon
- Natural Products Research Institute, College of Pharmacy, Seoul National University, San 56-1, Sillim, Seoul 151-742, Korea, Marine Natural Products Laboratory, Korea Ocean Research and Development Institute, Ansan P.O. Box 29, Seoul 425-600, Korea, Department of Biological Science, College of Life Science and Nano Technology, Hannam University,461-6 Jeonmin, Yuseong, Daejeon 305-811, Korea, and Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University,
| | - Chaemin Lim
- Natural Products Research Institute, College of Pharmacy, Seoul National University, San 56-1, Sillim, Seoul 151-742, Korea, Marine Natural Products Laboratory, Korea Ocean Research and Development Institute, Ansan P.O. Box 29, Seoul 425-600, Korea, Department of Biological Science, College of Life Science and Nano Technology, Hannam University,461-6 Jeonmin, Yuseong, Daejeon 305-811, Korea, and Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University,
| | - Hyi-Seung Lee
- Natural Products Research Institute, College of Pharmacy, Seoul National University, San 56-1, Sillim, Seoul 151-742, Korea, Marine Natural Products Laboratory, Korea Ocean Research and Development Institute, Ansan P.O. Box 29, Seoul 425-600, Korea, Department of Biological Science, College of Life Science and Nano Technology, Hannam University,461-6 Jeonmin, Yuseong, Daejeon 305-811, Korea, and Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University,
| | - Chung J. Sim
- Natural Products Research Institute, College of Pharmacy, Seoul National University, San 56-1, Sillim, Seoul 151-742, Korea, Marine Natural Products Laboratory, Korea Ocean Research and Development Institute, Ansan P.O. Box 29, Seoul 425-600, Korea, Department of Biological Science, College of Life Science and Nano Technology, Hannam University,461-6 Jeonmin, Yuseong, Daejeon 305-811, Korea, and Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University,
| | - Ki-Bong Oh
- Natural Products Research Institute, College of Pharmacy, Seoul National University, San 56-1, Sillim, Seoul 151-742, Korea, Marine Natural Products Laboratory, Korea Ocean Research and Development Institute, Ansan P.O. Box 29, Seoul 425-600, Korea, Department of Biological Science, College of Life Science and Nano Technology, Hannam University,461-6 Jeonmin, Yuseong, Daejeon 305-811, Korea, and Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University,
| | - Jongheon Shin
- Natural Products Research Institute, College of Pharmacy, Seoul National University, San 56-1, Sillim, Seoul 151-742, Korea, Marine Natural Products Laboratory, Korea Ocean Research and Development Institute, Ansan P.O. Box 29, Seoul 425-600, Korea, Department of Biological Science, College of Life Science and Nano Technology, Hannam University,461-6 Jeonmin, Yuseong, Daejeon 305-811, Korea, and Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University,
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35
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Abstract
A dual cycloaddition strategy for the synthesis of the hetisine alkaloids has been developed, illustrated by a concise asymmetric total synthesis of (+)-nominine (7). The approach relies on an early-stage intramolecular 1,3-dipolar cycloaddition of a 4-oxido-isoquinolinium betaine dipole with an ene-nitrile dipolarophile. Subsequent late-stage pyrrolidine-induced dienamine isomerization/Diels-Alder cascade allows for rapid construction of the carbon--nitrogen polycyclic skeleton within this class of C(20)-diterpenoid alkaloids.
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Affiliation(s)
- Kevin M. Peese
- Department of Chemistry, University of Illinois Urbana, IL 61801 (USA)
| | - David Y. Gin
- Memorial Sloan-Kettering Cancer Center 1275 York Avenue, New York, NY 10065 (USA), Fax: (+1)646-422-0416, E-mail:
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36
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Price Mortimer AJ, Pang PS, Aliev AE, Tocher DA, Porter MJ. Concise synthesis of bicyclic aminals and their evaluation as precursors to the sarain core. Org Biomol Chem 2008; 6:2941-51. [DOI: 10.1039/b806031b] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Affiliation(s)
- Neil K Garg
- Department of Chemistry, University of California-Irvine, 1102 Natural Sciences 2, Irvine, CA 92697-2025, USA
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38
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Hong S, Yang J, Weinreb SM. Construction of an advanced tetracyclic intermediate for total synthesis of the marine alkaloid sarain A. J Org Chem 2007; 71:2078-89. [PMID: 16496996 PMCID: PMC2527041 DOI: 10.1021/jo052504r] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In work directed toward a total synthesis of the marine alkaloid sarain A (1), the advanced intermediate 54, containing all the key elements and the seven stereogenic centers of sarain A, has been successfully synthesized from bicyclic lactam 4, previously prepared via an intramolecular stereospecific [3 + 2]-azomethine ylide dipolar cycloaddition. Intermediate lactam 4 could be efficiently converted to N-Boc derivative 12. Introduction of a two-carbon fragment into lactam 12 which eventually becomes the C-7',8' syn diol of the "eastern" ring was then achieved by C-acylation of the corresponding enolate with methoxyacetyl chloride followed by a highly stereoselective ketone reduction with Zn(BH4)2 to afford alcohol 16. Intermediate 16 has the incorrect C-7' relative stereochemistry for sarain A, but this problem was conveniently remedied by inverting the C-7' center via an intramolecular Ohfune-type cyclization of the silyl carbamate derived from Boc mesylate 27 to produce the key cyclic carbamate 28. It was then possible to convert acetal 28 to allylsilane 32 followed by cyclization to the alkaloid tricyclic core 33 via an allylsilane/N-sulfonyliminium ion cyclization. Formation of the "western" macrocyclic ring has been successfully addressed using functional group handles at C-3' and N-1' on the tricyclic core via a ring-closing olefin metathesis (RCM) strategy with the second-generation Grubbs ruthenium catalyst to produce intermediate macrolactam 47. A chelation-controlled addition of ethynylmagnesium bromide to advanced aldehyde 51 afforded a single diastereomeric adduct 53 which is tentatively assigned to have the correct C-7',8' syn-diol stereochemistry. This adduct could be rearranged to the conveniently protected amino carbonate 54 which is set up for construction of the remainder of the eastern ring of sarain A.
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39
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Ge CS, Hourcade S, Ferdenzi A, Chiaroni A, Mons S, Delpech B, Marazano C. A Biogenetically Based Strategy Towards the Polycyclic Core Skeleton of Sarain A. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600293] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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40
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Peese KM, Gin DY. Efficient synthetic access to the hetisine C20-diterpenoid alkaloids. A concise synthesis of nominine via oxidoisoquinolinium-1,3-dipolar and dienamine-Diels-Alder cycloadditions. J Am Chem Soc 2006; 128:8734-5. [PMID: 16819859 PMCID: PMC2610465 DOI: 10.1021/ja0625430] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A concise synthetic approach to the hetisine C20-diterpenoid alkaloids is reported. The total synthesis of (+/-)-nominine was accomplished in a 15-step sequence employing a dual cycloaddition strategy. Key features of the synthesis include a reversible intramolecular 4-oxidoisoquinolinium betaine dipolar cycloaddition in conjunction with a pyrrolidine-induced dienamine isomerization/Diels-Alder cascade.
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Affiliation(s)
- Kevin M. Peese
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801
| | - David Y. Gin
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801
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41
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42
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Ken Lee CL, Ling HY, Loh TP. Asymmetric Synthesis of C-Aliphatic Homoallylic Amines and Biologically Important Cyclohexenylamine Analogues. J Org Chem 2004; 69:7787-9. [PMID: 15498019 DOI: 10.1021/jo048903o] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient method for the asymmetric synthesis of C-aliphatic homoallylic amines with up to 94% yield and 80% de is reported. Ring-closing metathesis of several chiral homoallylic amines using the second-generation Grubbs catalyst provided easy access to a wide variety of cyclohexenylamines.
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Affiliation(s)
- Chi-Lik Ken Lee
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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43
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Kun Cha J, Ik Lee H, Je Sung M, Bong Lee H. An Improved Synthesis of the Tricyclic Core of Sarains by a 3-Oxidopyridinium Betaine Cycloaddition. HETEROCYCLES 2004. [DOI: 10.3987/com-03-s(p)29] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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44
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Xiong H, Huang J, Ghosh SK, Hsung RP. Stereoselective Intramolecular [4 + 3] Cycloadditions of Nitrogen-Stabilized Chiral Oxyallyl Cations via Epoxidation of N-Tethered Allenamides. J Am Chem Soc 2003; 125:12694-5. [PMID: 14558802 DOI: 10.1021/ja030416n] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first intramolecular [4 + 3] cycloaddition reaction using nitrogen-stabilized chiral oxyallyl cations that are tethered to furan or diene through the nitrogen atom is described here. Formation of these nitrogen-stabilized chiral oxyallyl cations is achieved by a chemoselective epoxidation of chiral allenamides via syringe pump addition of dimethyl dioxirane. The ensuing cycloaddition can be carried out with a range of different lengths for the tether, and high diastereoselectivities can be obtained when using chiral allenamides with shorter tethers.
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Affiliation(s)
- Hui Xiong
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
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45
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Schmidt A, Habeck T, Kindermann MK, Nieger M. New pyrazolium-carboxylates as structural analogues of the pseudo-cross-conjugated betainic alkaloid nigellicine. J Org Chem 2003; 68:5977-82. [PMID: 12868936 DOI: 10.1021/jo0344337] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pyrazolium-3-carboxylates were examined as relatives of the betainic alkaloid Nigellicine and as new examples of the sparsely populated class 16 of heterocyclic pseudo-cross-conjugated mesomeric betaines (PCCMB). The title compounds were prepared in a 4-step procedure starting from beta-diketo compounds 8 which were cyclized with substituted hydrazines. The resulting isomeric pyrazole esters 9 and 10 were separated and subsequently quaternized with dimethyl sulfate in the presence of nitrobenzene to pyrazolium esters 11 and 12. Saponification was best accomplished in diluted sulfuric acid, which resulted in the formation of the pseudo-cross-conjugated mesomeric betaines 13 and 14 in one step. Protonation to the corresponding carboxylic acids required the treatment of the betaines with tetrafluoroboric acid in dichloromethane. The effect of negative solvatochromism proves the charge separation in the ground state of the molecules. X-ray crystallographic analyses, semiempirical calculations, and ESI mass spectrometric measurements were performed to gain knowledge about the phenomenon of pseudo-cross-conjugation.
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Affiliation(s)
- Andreas Schmidt
- Technical University of Clausthal, Institute of Organic Chemistry, Leibnizstrasse 6, D-38678 Clausthal-Zellerfeld, Germany.
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46
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Sung MJ, Lee HI, Lee HB, Cha JK. Synthetic studies toward sarain A. Formation of the western macrocyclic ring. J Org Chem 2003; 68:2205-8. [PMID: 12636382 DOI: 10.1021/jo026914g] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Starting with the tricyclic core 2b, annulation to form the 13-membered western ring of sarain A has been achieved to afford the macrocycle 30a by initial construction of the sterically congested quaternary center at C-3, followed by elaboration of the C-3 side-chain and ring-closing olefin metathesis. Also included is a parallel conversion of tricycle 2c to macrocycle 30b containing a functionalized side-chain at N-1 suitable for attachment of the eastern macrocyclic ring.
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Affiliation(s)
- Moo Je Sung
- Department of Chemistry, University of Alabama, Tuscaloosa, Alabama 35487, USA
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47
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Multi-component coupling reactions of aldehydes and amides with maleic anhydride: synthesis of 7-oxo-6-azabicyclo[3.2.1]oct-2-ene-8-carboxylic acids. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00116-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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48
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Rameshkumar C, Xiong H, Tracey MR, Berry CR, Yao LJ, Hsung RP. NMR studies on epoxidations of allenamides. Evidence for formation of nitrogen-substituted allene oxide and spiro-epoxide via trapping experiments. J Org Chem 2002; 67:1339-45. [PMID: 11846684 DOI: 10.1021/jo011048d] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two epoxidations of chiral allenamides are described here. While treatment with m-CPBA led to highly stereoselective formation of an alpha-keto aminal that can be useful synthetically, DMDO oxidation led to conclusive evidence for both nitrogen-substituted allene oxide (via mono-epoxidation) and spiro-epoxide (via bis-epoxidation) using intramolecular nucleophilic trapping experiments. NMR studies provide reliable evidence for a 3-oxetanone that can be derived from the spiro-epoxide and also suggest the presence of an allene oxide. Despite a facile second epoxidation as evidenced by the predominant formation of the 3-oxetanone, in the presence of furan, [4 + 3] cycloaddition of the nitrogen-substituted allene oxide or oxyallyl cation with furan occurs faster than the second epoxidation efficiently leading to cycloadducts. This rate difference plays an invaluable role for the success of a stereoselective sequential epoxidation-[4 + 3] cycloaddition reaction via DMDO epoxidations of chiral allenamides.
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Affiliation(s)
- C Rameshkumar
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
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49
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Kwak YS, Winkler JD. Synthesis of 6-aza-bicyclo[3,2,1]octan-3-ones via vinylogous imide photochemistry: an approach to the synthesis of the hetisine alkaloids. J Am Chem Soc 2001; 123:7429-30. [PMID: 11472177 DOI: 10.1021/ja010542w] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Y S Kwak
- Department of Chemistry The University of Pennsylvania Philadelphia, Pennsylvania 19104, USA
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50
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Xiong H, Hsung RP, Berry CR, Rameshkumar C. The first epoxidations of 1-amidoallenes. A general entry to nitrogen-substituted oxyallyl cations in highly stereoselective [4 +3] cycloadditions. J Am Chem Soc 2001; 123:7174-5. [PMID: 11459504 DOI: 10.1021/ja0108638] [Citation(s) in RCA: 115] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H Xiong
- Department of Chemistry, University of Minnesota Minneapolis, Minnesota 55455, USA
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