1
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Sarkar R, Korell A, Schneider C. Organocatalytic enantioselective oxa-Piancatelli rearrangement. Chem Commun (Camb) 2024; 60:3063-3066. [PMID: 38385217 DOI: 10.1039/d4cc00708e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
The first highly enantioselective oxa-Piancatelli rearrangement has been developed. This process which is catalyzed by a chiral BINOL-derived phosphoric acid rearranges a wide range of furylcarbinols into densely substituted γ-hydroxy cyclopentenones in high yield with excellent diastereo- and enantioselectivities (up to 99 : 1 er). This reaction exhibits a high functional group tolerance and was applied to complex bioactive molecules as well. The products were further manipulated into value-added molecular scaffolds further highlighting their versatility and synthetic utility.
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Affiliation(s)
- Rahul Sarkar
- Institut für Organische Chemie, Universität Leipzig, Leipzig D-04103, Germany.
| | - Alexander Korell
- Institut für Organische Chemie, Universität Leipzig, Leipzig D-04103, Germany.
| | - Christoph Schneider
- Institut für Organische Chemie, Universität Leipzig, Leipzig D-04103, Germany.
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2
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Ge JC, Wang Y, Guo FW, Kong X, Hu F, Li SS. Dearomatization of 3-Aminophenols for Synthesis of Spiro[chromane-3,1'-cyclohexane]-2',4'-dien-6'-ones via Hydride Transfer Strategy-Enabled [5+1] Annulations. Molecules 2024; 29:1012. [PMID: 38474524 DOI: 10.3390/molecules29051012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 02/16/2024] [Accepted: 02/21/2024] [Indexed: 03/14/2024] Open
Abstract
The Sc(OTf)3-catalyzed dearomative [5+1] annulations between readily available 3-aminophenols and O-alkyl ortho-oxybenzaldehydes were developed for synthesis of spiro[chromane-3,1'-cyclohexane]-2',4'-dien-6'-ones. The "two-birds-with-one-stone" strategy was disclosed by the dearomatization of phenols and direct α-C(sp3)-H bond functionalization of oxygen through cascade condensation/[1,5]-hydride transfer/dearomative-cyclization process. In addition, the antifungal activity assay and derivatizations of products were conducted to further enrich the utility of the structure.
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Affiliation(s)
- Jia-Cheng Ge
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
- Hailir Pesticides and Chemicals Group Co., Ltd., Qingdao 266109, China
| | - Yufeng Wang
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Feng-Wei Guo
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Xiangyun Kong
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Fangzhi Hu
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Shuai-Shuai Li
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
- Hailir Pesticides and Chemicals Group Co., Ltd., Qingdao 266109, China
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3
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Stünkel T, Siebold K, Okumatsu D, Murata K, Ruyet L, Daniliuc CG, Gilmour R. para-Selective dearomatization of phenols by I(i)/I(iii) catalysis-based fluorination. Chem Sci 2023; 14:13574-13580. [PMID: 38033893 PMCID: PMC10685341 DOI: 10.1039/d3sc05952a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 11/08/2023] [Indexed: 12/02/2023] Open
Abstract
The regio- and enantio-selective dearomatization of phenols has been achieved by I(i)/I(iii) catalysis enabled fluorination. The process is highly para-selective, guiding the fluoride nucleophile to the distal C4 position of the substrate to generate fluorinated cyclohexadienones in an operationally simple manner. Extensive optimization has revealed key parameters that orchestrate enantioselectivity in this historically challenging transformation. A range of diversely substituted substrates are disclosed (20 examples, up to 92 : 8 e.r.) and the reaction displays efficiency that is competitive with the current state of the art in hydroxylation chemistry: this provides a preparative platform to enable OH to F bioisosterism to be explored. Finally, the utility of the products in accessing densely functionalized cyclic scaffolds with five contiguous stereocenters is disclosed together with crystallographic analyses to unveil fluorine-carbonyl non-covalent interactions.
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Affiliation(s)
- Timo Stünkel
- Organisch-Chemisches Institut, Universität Münster Corrensstraße 36 48149 Münster Germany
| | - Kathrin Siebold
- Organisch-Chemisches Institut, Universität Münster Corrensstraße 36 48149 Münster Germany
| | - Daichi Okumatsu
- Organisch-Chemisches Institut, Universität Münster Corrensstraße 36 48149 Münster Germany
| | - Kazuki Murata
- Organisch-Chemisches Institut, Universität Münster Corrensstraße 36 48149 Münster Germany
| | - Louise Ruyet
- Organisch-Chemisches Institut, Universität Münster Corrensstraße 36 48149 Münster Germany
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut, Universität Münster Corrensstraße 36 48149 Münster Germany
| | - Ryan Gilmour
- Organisch-Chemisches Institut, Universität Münster Corrensstraße 36 48149 Münster Germany
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4
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Gao X, Han TJ, Li BB, Hou XX, Hua YZ, Jia SK, Xiao X, Wang MC, Wei D, Mei GJ. Catalytic asymmetric dearomatization of phenols via divergent intermolecular (3 + 2) and alkylation reactions. Nat Commun 2023; 14:5189. [PMID: 37626030 PMCID: PMC10457327 DOI: 10.1038/s41467-023-40891-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023] Open
Abstract
The catalytic asymmetric dearomatization (CADA) reaction has proved to be a powerful protocol for rapid assembly of valuable three-dimensional cyclic compounds from readily available planar aromatics. In contrast to the well-studied indoles and naphthols, phenols have been considered challenging substrates for intermolecular CADA reactions due to the combination of strong aromaticity and potential regioselectivity issue over the multiple nucleophilic sites (O, C2 as well as C4). Reported herein are the chiral phosphoric acid-catalyzed divergent intermolecular CADA reactions of common phenols with azoalkenes, which deliver the tetrahydroindolone and cyclohexadienone products bearing an all-carbon quaternary stereogenic center in good yields with excellent ee values. Notably, simply adjusting the reaction temperature leads to the chemo-divergent intermolecular (3 + 2) and alkylation dearomatization reactions. Moreover, the stereo-divergent synthesis of four possible stereoisomers in a kind has been achieved via changing the sequence of catalyst enantiomers.
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Affiliation(s)
- Xiang Gao
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Tian-Jiao Han
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Bei-Bei Li
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Xiao-Xiao Hou
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Yuan-Zhao Hua
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Shi-Kun Jia
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Xiao Xiao
- Institute of Pharmaceutical Science and Technology, Zhejiang University of Technology, Hangzhou, 310014, People's Republic of China
| | - Min-Can Wang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Donghui Wei
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Guang-Jian Mei
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People's Republic of China.
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5
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Ye Z, Liu W, Gu H, Yang X. Enantioselective Dearomatization of Substituted Phenols via Organocatalyzed Electrophilic Amination. Org Lett 2023; 25:5838-5843. [PMID: 37523610 DOI: 10.1021/acs.orglett.3c02100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Highly efficient and stereoselective dearomatization of substituted phenols was achieved via chiral phosphoric acid-catalyzed electrophilic para-amination with commercially available azodicarboxylates. This protocol readily afforded a series of chiral 2,5-cyclohexadienones bearing 4-aza-quaternary stereocenters with excellent yields and enantioselectivities (≤99% yield and >99% ee). Easy scale-up of this reaction to a gram scale and diverse derivatizations of the chiral products into α-tertiary amines and α-tertiary heterocycles derivatives well demonstrated the potential of this method.
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Affiliation(s)
- Zidan Ye
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Wei Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Huanchao Gu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Xiaoyu Yang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
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6
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Bai L, Wang L, Zhu H, Pang S, Li S, Lv J, Zhang H, Yang D. Development of ProPhenol/Ti(IV) Catalyst for Asymmetric Hydroxylative Dearomatization of Naphthols. Org Lett 2023; 25:867-871. [PMID: 36723617 DOI: 10.1021/acs.orglett.3c00077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
By development of ProPhenol/Ti(IV) catalysts, a catalytic enantioselective hydroxylative dearomatization of naphthols is achieved by using TBHP as a simple oxidative reagent. The side coordinative chain equipped on the C1-position of β-naphthols plays an important role for initiating this asymmetric hydroxylative reaction, which might be a result of the proper cocoordination effects to the titanium center in the catalyst. A reasonable catalytic cycle is proposed, the catalytic system is applied to a reasonable range of this type of phenolic compound, and related concise transformations are carried out.
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Affiliation(s)
- Lutao Bai
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, China
| | - Linqing Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, China
| | - Haiyong Zhu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, China
| | - Shiming Pang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, China
| | - Shixin Li
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, China
| | - Jiaming Lv
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, China
| | - Hailong Zhang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, China
| | - Dongxu Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, China
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7
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Achiral organoiodine-functionalized helical polyisocyanides for multiple asymmetric dearomative oxidations. Nat Commun 2023; 14:566. [PMID: 36732532 PMCID: PMC9894859 DOI: 10.1038/s41467-023-36327-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 01/24/2023] [Indexed: 02/04/2023] Open
Abstract
Immobilizing organocatalyst onto helical polymers not only facilitates the catalyst recycling from homogeneous reactions, but also boosts enantioselectivity. In this work, achiral organoiodine-functionalized single left- and right-handed helical polyisocyanides were prepared from the same monomers, which catalyzed three asymmetric oxidations gave the desired products in high yields and excellent enantioselectivity. The enantiomeric excess of the target products was up to 95%. Remarkably, the enantioselectivity can be switched by reversing the helicity of the polymer backbone. The polymer catalysts can be facilely recovered and recycled in different asymmetric oxidations with maintained excellent activity and enantioselectivity.
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8
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Elsherbini M, Moran WJ. Toward a General Protocol for Catalytic Oxidative Transformations Using Electrochemically Generated Hypervalent Iodine Species. J Org Chem 2023; 88:1424-1433. [PMID: 36689352 PMCID: PMC9903329 DOI: 10.1021/acs.joc.2c02309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A simple catalytic electrosynthetic protocol for oxidative transformations mediated by hypervalent iodine reagents has been developed. In this protocol, electricity drives the iodine(I)/iodine(III) catalytic cycle enabling catalysis with in situ generated hypervalent iodine species, thereby eliminating chemical oxidants and the inevitable chemical waste associated with their mode of action. In addition, no added electrolytic salts are needed in this process. The developed method has been validated using two different hypervalent iodine-mediated transformations: (i) the oxidative cyclization of N-allylic and N-homoallylic amides to the corresponding dihydrooxazole and dihydro-1,3-oxazine derivatives, respectively, and (ii) the α-tosyloxylation of ketones. Both reactions proceeded smoothly under the developed catalytic electrosynthetic conditions without reoptimization, featuring a wide substrate scope and excellent functional group tolerance. In addition, scale-up to gram-scale and catalyst recovery were easily achieved maintaining the high efficiency of the process.
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9
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Kraszewski K, Tomczyk I, Kalek M. Intermolecular enantioselective dearomatizing para-methoxylation of phenols using 2-iodoresorcinol/lactamide catalysts. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Lee HJ, Choi ES, Maruoka K. Development of a catalytic ester activation protocol for the efficient formation of amide bonds using an Ar‐I/HF•pyridine/mCPBA system. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hyo-Jun Lee
- Kunsan National University Department of Chemistry KOREA, REPUBLIC OF
| | - Eun-Sol Choi
- Kunsan National University Department of Chemistry KOREA, REPUBLIC OF
| | - Keiji Maruoka
- Kyoto University Graduate School of Pharmaceutical Sciences Sakyo 606-8501 Kyoto JAPAN
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11
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Martins FA, de Azevedo Santos L, Rodrigues Silva D, Fonseca Guerra C, Bickelhaupt FM, Freitas MP. Iodine Gauche Effect Induced by an Intramolecular Hydrogen Bond. J Org Chem 2022; 87:11625-11633. [PMID: 35984736 DOI: 10.1021/acs.joc.2c01258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The gauche conformer in 1-X,2-Y-disubstituted ethanes, that is, the staggered orientation in which X and Y are in closer contact, is only favored for relatively small substituents that do not give rise to large X···Y steric repulsion. For more diffuse substituents, weakly attractive orbital interactions between antiperiplanar bonds (i.e., hyperconjugation) cannot overrule the repulsive forces between X and Y. Our quantum chemical analyses of the rotational isomerism of XCH2CH2Y (X = F, OH; Y = I) at ZORA-BP86-D3(BJ)/QZ4P reveal that indeed the anti conformer is generally favored due to a less destabilizing I···F and I···O-H steric repulsion. The only case when the gauche conformer is preferred is when the hydroxyl hydrogen is oriented toward the iodine atom in the 2-iodoethanol. This is because of the significantly stabilizing covalent component of the I···H-O intramolecular hydrogen bond. Therefore, we show that strong intramolecular interactions can overcome the steric repulsion between bulky substituents in 1,2-disubstituted ethanes and cause the gauche effect. Our quantum chemical computations have guided nuclear magnetic resonance experiments that confirm the increase in the gauche population as X goes from F to OH.
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Affiliation(s)
- Francisco A Martins
- Department of Chemistry, Institute of Natural Sciences, Federal University of Lavras, 37200-900 Lavras, Minas Gerais, Brazil
| | - Lucas de Azevedo Santos
- Department of Theoretical Chemistry, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Daniela Rodrigues Silva
- Department of Theoretical Chemistry, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Célia Fonseca Guerra
- Department of Theoretical Chemistry, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - F Matthias Bickelhaupt
- Department of Theoretical Chemistry, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands.,Institute for Molecules and Materials (IMM), Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Matheus P Freitas
- Department of Chemistry, Institute of Natural Sciences, Federal University of Lavras, 37200-900 Lavras, Minas Gerais, Brazil
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12
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Alvi S, Jayant V, Ali R. Applications of Oxone® in Organic Synthesis: An Emerging Green Reagent of Modern Era. ChemistrySelect 2022. [DOI: 10.1002/slct.202200704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shakeel Alvi
- Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, Okhla New Delhi 110025 India
| | - Vikrant Jayant
- Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, Okhla New Delhi 110025 India
| | - Rashid Ali
- Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, Okhla New Delhi 110025 India
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13
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Luo D, Hu L, Gao T, Zhang X, Xiong Y. Synthesis of Altenuene Backbones through Iodine(III)-Participated Umpolung Diesterification and Insights into the General [1,5]-H Shift in para-Dearomatization of Phenols via Quantum Chemical Calculations. J Org Chem 2022; 87:5065-5075. [PMID: 35377643 DOI: 10.1021/acs.joc.1c02915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Through PhI(OAc)2-oxidized dearomatization and diesterification of 3'-hydroxy-[1,1'-biphenyl]-2-carboxylic acids, a series of polycyclic compounds possessing an altenuene backbone were obtained in moderate to good yields. The Umpolung diesterification reaction was completed under mild reaction conditions without an additional nucleophilic reagent. This work offers a concise method for the synthesis of diverse natural altenuene analogues. The mechanism was proposed, and the [1,5]-H shift was studied in isomerization from the ketone-form structure to a phenol employing computational studies.
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Affiliation(s)
- Dan Luo
- School of Chemistry and Chemical Engineering, and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, China
| | - Liangzhen Hu
- School of Chemistry and Chemical Engineering, and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, China
| | - Tianyong Gao
- School of Chemistry and Chemical Engineering, and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, China
| | - Xiaohui Zhang
- School of Chemistry and Chemical Engineering, and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, China
| | - Yan Xiong
- School of Chemistry and Chemical Engineering, and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, China.,State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China.,School of Chemical and Environmental Engineering, and Collaborative Innovation Center for High Value Transformation of Coal Chemical Process By-products, Xinjiang Institute of Engineering, Xinjiang 830091, China
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14
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Ploypradith P, Songthammawat P, Phumjan T, Ruchirawat S. 4b-Aryltetrahydroindeno[1,2-a]indenes by Acid-Catalyzed Transannular Cyclization of Benzannulated Cyclooctene Alcohols. Synlett 2022. [DOI: 10.1055/a-1778-8143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractBy starting from two simple building blocks, benzannulated cyclooctenones were obtained in three steps. Subsequent Grignard/aryl lithium addition to the ketone yielded the corresponding tertiary alcohols that underwent stereoselective acid-catalyzed transannular cyclization to provide a cis-fused 5/5 bicyclic indanylindane framework exclusively. Subsequent stereoselective nucleophilic addition to the indanyl cation by hydride, water, or electron-rich aromatics furnished the 4b-aryltetrahydroindano[1,2-a]indenes in good to excellent yields (up to 92%) in the trans-C9–C9a form in up to a >99:1 diastereomeric ratio.
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Affiliation(s)
- Poonsakdi Ploypradith
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute
- Program in Chemical Sciences, Chulabhorn Graduate Institute, Chulabhorn Royal Academy
- Center of Excellence on Environmental Health and Toxicology, Office of the Permanent Secretary (OPS), Ministry of Higher Education, Science, Research and Innovation (MHESI)
| | | | - Tanawat Phumjan
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute
| | - Somsak Ruchirawat
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute
- Program in Chemical Sciences, Chulabhorn Graduate Institute, Chulabhorn Royal Academy
- Center of Excellence on Environmental Health and Toxicology, Office of the Permanent Secretary (OPS), Ministry of Higher Education, Science, Research and Innovation (MHESI)
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15
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Zhu B, Guo W, Sun Q, Qian P, Ye L, Li L. Auxiliary‐Free Remote Dearomatizative Nitrenoid Transfer for Enantioselective Construction of Spirolactams. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202101189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Bo‐Han Zhu
- College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 People's Republic of China
- State Key Laboratory of Physical Chemistry of Solid Surfaces Key Laboratory for Chemical Biology of Fujian Province College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 People's Republic of China
| | - Wen‐Ting Guo
- College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 People's Republic of China
| | - Qing Sun
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong University Nanchang 330063 People's Republic of China
| | - Peng‐Cheng Qian
- College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 People's Republic of China
| | - Long‐Wu Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces Key Laboratory for Chemical Biology of Fujian Province College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 People's Republic of China
| | - Long Li
- College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 People's Republic of China
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16
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Kumar R, Singh FV, Takenaga N, Dohi T. Asymmetric Direct/Stepwise Dearomatization Reactions Involving Hypervalent Iodine Reagents. Chem Asian J 2021; 17:e202101115. [PMID: 34817125 DOI: 10.1002/asia.202101115] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Revised: 11/19/2021] [Indexed: 01/06/2023]
Abstract
A remarkable growth in hypervalent iodine-mediated oxidative transformations as stoichiometric reagents as well as catalysts has been well-documented due to their excellent properties, such as mildness, easy handling, high selectivity, environmentally friendly nature, and high stability. This review aims at highlighting the asymmetric oxidative dearomatization reactions involving hypervalent iodine compounds. The present article summarizes asymmetric intra- and intermolecular dearomatization reactions using chiral hypervalent iodine reagents/catalysts as well as hypervalent iodine-mediated dearomatization reactions followed by desymmetrization.
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Affiliation(s)
- Ravi Kumar
- Department of Chemistry, J. C. Bose University of Science & Technology, YMCA Faridabad, NH-2, Sector-6, Mathura Road, Faridabad, Haryana, 121006, India
| | - Fateh V Singh
- Chemistry Division, School of Advanced Sciences (SAS), Vellore Institute of Technology - Chennai, Chennai, 600127, Tamil Nadu, India
| | - Naoko Takenaga
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya, 468-8503, Japan
| | - Toshifumi Dohi
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, 525-0058, Japan
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17
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Shimazaki Y, Wata C, Hashimoto T, Maruoka K. Enantioselective Hydrative
para‐
Dearomatization of Sulfonanilides by an Indanol‐based Chiral Organoiodine Catalyst. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100152] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yuto Shimazaki
- Department of Chemistry Graduate School of Science Kyoto University 606-8502 Kyoto Sakyo Japan
| | - Chisato Wata
- Chiba Iodine Resource Innovation Center and Department of Chemistry, Graduate School of Science Chiba University 1–33, Yayoi, Inage 263-8522 Chiba Japan
| | - Takuya Hashimoto
- Chiba Iodine Resource Innovation Center and Department of Chemistry, Graduate School of Science Chiba University 1–33, Yayoi, Inage 263-8522 Chiba Japan
| | - Keiji Maruoka
- Department of Chemistry Graduate School of Science Kyoto University 606-8502 Kyoto Sakyo Japan
- School of Chemical Engineering and Light Industry Guangdong University of Technology 510006 Guangzhou Panyu District P. R. China
- Graduate School of Pharmaceutical Sciences Kyoto University 606-8501 Kyoto Sakyo Japan
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18
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Wirth T, Elsherbini M, Osi A, Alharbi H, Karam F. Sulfur-Based Chiral Iodoarenes: An Underexplored Class of Chiral Hypervalent Iodine Reagents. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1508-9593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractChiral hypervalent iodine reagents are active players in modern stereoselective organic synthesis. Structurally diverse chiral hypervalent iodine reagents have been synthesised and extensively studied, but hypervalent iodine reagents containing chiral sulfur stereogenic centre are scarce and their synthesis is challenging. A small library of iodoarenes containing chiral sulfinamide and chiral sulfoximine moieties has been synthesised using commercially available reagents. The oxidation of the chiral iodoarene precursors to iodine(III) reagents was cumbersome due to facile overoxidation of the sulfoxide moiety and hence loss of chirality under various oxidation conditions. Oxidation of chiral sulfonimidoyl derivatives to the corresponding hypervalent iodine reagents was successful and led to novel sulfur-based chiral iodine(III) reagents.
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Affiliation(s)
| | - Mohamed Elsherbini
- School of Chemistry, Cardiff University
- New address: Department of Chemistry, University of Huddersfield
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19
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Zhang C, Yang XG, Hu ZN, Jia MC, Du FH. Recent Advances and the Prospect of Hypervalent Iodine Chemistry. Synlett 2021. [DOI: 10.1055/a-1492-4943] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
AbstractNowadays, hypervalent iodine chemistry has remarkably advanced in parallel with the emergence of novel hypervalent iodine reagents. Hypervalent iodine reagents, due to their outstanding characteristics including rich reactivities, excellent chemoselectivity, stability, and environmental friendliness, are becoming more and more popular in the synthetic organic chemistry. In this Account, a number of recent elegant research works and our perspective on the future of hypervalent iodine chemistry is presented.1 Introduction2 Recent Advances and Discussion2.1 Novel Reactivities of Hypervalent Iodine Reagents2.2 Atom-Economical Reactions Promoted by Hypervalent Iodine Reagents2.3 Other Applications of Hypervalent Iodine Reagents2.4 The Applications of DFT Calculations in Elucidating Reaction Mechanism Involving Hypervalent Iodine Reagents3 Outlook and Conclusion
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20
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Lee E, Hwang Y, Kim YB, Kim D, Chang S. Enantioselective Access to Spirolactams via Nitrenoid Transfer Enabled by Enhanced Noncovalent Interactions. J Am Chem Soc 2021; 143:6363-6369. [DOI: 10.1021/jacs.1c02550] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Euijae Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea
| | - Yeongyu Hwang
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea
| | - Yeong Bum Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea
| | - Dongwook Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea
| | - Sukbok Chang
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea
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21
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Alharbi H, Elsherbini M, Qurban J, Wirth T. C-N Axial Chiral Hypervalent Iodine Reagents: Catalytic Stereoselective α-Oxytosylation of Ketones. Chemistry 2021; 27:4317-4321. [PMID: 33428245 PMCID: PMC7986903 DOI: 10.1002/chem.202005253] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 01/07/2021] [Indexed: 12/22/2022]
Abstract
A simple synthesis of a library of novel C−N axially chiral iodoarenes is achieved in a three‐step synthesis from commercially available aniline derivatives. C−N axial chiral iodine reagents are rarely investigated in the hypervalent iodine arena. The potential of the novel chiral iodoarenes as organocatalysts for stereoselective oxidative transformations is assessed using the well explored, but challenging stereoselective α‐oxytosylation of ketones. All investigated reagents catalyse the stereoselective oxidation of propiophenone to the corresponding chiral α‐oxytosylated products with good stereochemical control. Using the optimised reaction conditions a wide range of products was obtained in generally good to excellent yields and with good enantioselectivities.
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Affiliation(s)
- Haifa Alharbi
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Mohamed Elsherbini
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK.,current address: Department of Chemistry, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, UK
| | - Jihan Qurban
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK.,current address: Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Thomas Wirth
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
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22
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Yoshida Y, Ishikawa S, Mino T, Sakamoto M. Bromonium salts: diaryl-λ3-bromanes as halogen-bonding organocatalysts. Chem Commun (Camb) 2021; 57:2519-2522. [DOI: 10.1039/d0cc07733j] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Bromonium salts have been typically but infrequently used as good leaving groups owing to their high nucleofugality. Herein, we report the synthesis of stable bromonium salts and their first catalytic application, with excellent product yield.
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Affiliation(s)
- Yasushi Yoshida
- Molecular Chirality Research Center
- Graduate School of Engineering
- Chiba University
- 1-33, Yayoi-cho, Inage-ku
- Chiba-Shi
| | - Seitaro Ishikawa
- Molecular Chirality Research Center
- Graduate School of Engineering
- Chiba University
- 1-33, Yayoi-cho, Inage-ku
- Chiba-Shi
| | - Takashi Mino
- Molecular Chirality Research Center
- Graduate School of Engineering
- Chiba University
- 1-33, Yayoi-cho, Inage-ku
- Chiba-Shi
| | - Masami Sakamoto
- Molecular Chirality Research Center
- Graduate School of Engineering
- Chiba University
- 1-33, Yayoi-cho, Inage-ku
- Chiba-Shi
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23
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Nishimoto Y, Fujie M, Hara J, Yasuda M. Effect of noncovalent interactions in ion pairs on hypervalent iodines: inversion of regioselectivity in sulfonyloxylactonization. Org Chem Front 2021. [DOI: 10.1039/d1qo00523e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The noncovalent interactions between the sulfonyloxy group and the cationic nitrogen-containing heterocyclic moiety substituted in hypervalent iodines caused specific regioselectivity in the sulfonyloxylactonization of 2-vinyl benzoic acids.
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Affiliation(s)
- Yoshihiro Nishimoto
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Masaki Fujie
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Junki Hara
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Makoto Yasuda
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
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24
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Wang Q, Lübcke M, Biosca M, Hedberg M, Eriksson L, Himo F, Szabó KJ. Enantioselective Construction of Tertiary Fluoride Stereocenters by Organocatalytic Fluorocyclization. J Am Chem Soc 2020; 142:20048-20057. [PMID: 33191747 PMCID: PMC7735711 DOI: 10.1021/jacs.0c09323] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
![]()
1,1-Disubstituted styrenes with internal
oxygen and nitrogen nucleophiles
undergo oxidative fluorocyclization reactions with in situ generated chiral iodine(III)-catalysts. The resulting fluorinated
tetrahydrofurans and pyrrolidines contain a tertiary carbon–fluorine
stereocenter. Application of a new 1-naphthyllactic acid-based iodine(III)-catalyst
allows the control of tertiary carbon–fluorine stereocenters
with up to 96% ee. Density functional theory calculations are performed
to investigate the details of the mechanism and the factors governing
the stereoselectivity of the reaction.
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Affiliation(s)
- Qiang Wang
- Department of Organic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Marvin Lübcke
- Department of Organic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Maria Biosca
- Department of Organic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Martin Hedberg
- Department of Organic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Lars Eriksson
- Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Fahmi Himo
- Department of Organic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Kálmán J Szabó
- Department of Organic Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
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25
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Zheng H, Xue XS. Recent Computational Studies on Mechanisms of Hypervalent Iodine(III)-Promoted Dearomatization of Phenols. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824999200620223218] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hypervalent iodine-promoted dearomatization of phenols has received intense
attention. This mini-review summarizes recent computational mechanistic studies of phenolic
dearomatizations promoted by hypervalent iodine(III) reagents or catalysts. The first part
of this review describes mechanisms of racemic dearomatization of phenols, paying special
attention to the associative and dissociative pathways. The second part focuses on mechanisms
and selectivities of diastereo- or enantio-selective dearomatization of phenols.
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Affiliation(s)
- Hanliang Zheng
- College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xiao-Song Xue
- College of Chemistry, Nankai University, Tianjin 300071, China
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26
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Chandra G, Patel S. Molecular Complexity from Aromatics: Recent Advances in the Chemistry of
para
Quinol and Masked
para
‐Quinone Monoketal. ChemistrySelect 2020. [DOI: 10.1002/slct.202003802] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Girish Chandra
- Department of Chemistry School of Physical and Chemical Sciences Central University of South Bihar SH-7, Gaya-Panchanpur Road Gaya Bihar India 824236
| | - Samridhi Patel
- Department of Chemistry School of Physical and Chemical Sciences Central University of South Bihar SH-7, Gaya-Panchanpur Road Gaya Bihar India 824236
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27
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Wang Y, Wu ZG, Yang B, Wu XX. Recent Application of Chiral Aryliodine Based on the 2-Iodoresorcinol Core in Asymmetric Catalysis. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1705969] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
AbstractChiral iodoarenes have been steadily increasing in importance in recent years, especially in enantioselective synthesis and catalysis. Since the development of the concept of chiral iodine(I/III) catalysis, the use of various chiral aryliodine frameworks has been explored in this area. This short review gives an overview of the use of chiral hypervalent iodine(I/III) reagents based on the 2-iodoresorcinol core with two attached two lactic side chains bearing ester or amide groups for the catalytic enantioselective dearomatization of phenol compounds, asymmetric oxidation of alkenes, and enantioselective α-functionalization of carbonyl compounds highlighting the excellent reactivities in terms of yield and enantioselectivity.1 Introduction2 Enantioselective Dearomatization of Phenol Derivatives3 Asymmetric Oxidation of Alkenes4 Enantioselective α-Functionalization of Carbonyl Compounds5 Conclusion and Outlook
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28
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Design and synthesis of chiral urea-derived iodoarenes and their assessment in the enantioselective dearomatizing cyclization of a naphthyl amide. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131634] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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29
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Zhao R, Zhou Z, Liu J, Wang X, Zhang Q, Li D. Silver-Catalyzed para-Selective Amination and Aminative Dearomatization of Phenols with Azodicarboxylates in Water. Org Lett 2020; 22:8144-8149. [PMID: 32989991 DOI: 10.1021/acs.orglett.0c03147] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
An efficient silver-catalyzed para-selective amination and aminative dearomatization of phenols with azodicarboxylates was developed. It afforded the para-aminophenols or amino cyclohexadieneones from free phenols depending on whether it has a para-substituent. The reaction proceeded smoothly in water under simple and mild conditions, giving the highly selective products in good yields within a short reaction time. It also showed broad substrate scope and good functional group compatibility.
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Affiliation(s)
- Ruinan Zhao
- School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China
| | - Zhong Zhou
- School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China
| | - Jixiang Liu
- School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China
| | - Xia Wang
- School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China
| | - Qian Zhang
- School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China
| | - Dong Li
- School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China
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30
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Schober L, Sako M, Takizawa S, Gröger H, Sasai H. Catalytic and enantioselective oxa-Piancatelli reaction using a chiral vanadium complex. Chem Commun (Camb) 2020; 56:10151-10154. [PMID: 32735309 DOI: 10.1039/d0cc02621b] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
An enantioselective oxa-Piancatelli reaction was established for the first time using a chiral vanadium(v) catalyst. The dual Brønsted and Lewis acid properties of the vanadium catalyst afforded 4-hydroxycyclopent-2-enone derivatives in up to 90% yields and with 93 : 7 enantiomeric ratios, as well as >20 : 1 diastereomeric ratios.
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Affiliation(s)
- Lukas Schober
- Faculty of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany.
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31
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Kraszewski K, Tomczyk I, Drabinska A, Bienkowski K, Solarska R, Kalek M. Mechanism of Iodine(III)-Promoted Oxidative Dearomatizing Hydroxylation of Phenols: Evidence for a Radical-Chain Pathway. Chemistry 2020; 26:11584-11592. [PMID: 32608529 DOI: 10.1002/chem.202002026] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 06/26/2020] [Indexed: 11/09/2022]
Abstract
The oxidative dearomatization of phenols with the addition of nucleophiles to the aromatic ring induced by hypervalent iodine(III) reagents and catalysts has emerged as a highly useful synthetic approach. However, experimental mechanistic studies of this important process have been extremely scarce. In this report, we describe systematic investigations of the dearomatizing hydroxylation of phenols using an array of experimental techniques. Kinetics, EPR spectroscopy, and reactions with radical probes demonstrate that the transformation proceeds by a radical-chain mechanism, with a phenoxyl radical being the key chain-carrying intermediate. Moreover, UV and NMR spectroscopy, high-resolution mass spectrometry, and cyclic voltammetry show that before reacting with the phenoxyl radical, the water molecule becomes activated by the interaction with the iodine(III) center, causing the Umpolung of this formally nucleophilic substrate. The radical-chain mechanism allows the rationalization of all existing observations regarding the iodine(III)-promoted oxidative dearomatization of phenols.
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Affiliation(s)
- Karol Kraszewski
- Centre of New Technologies, University of Warsaw, S. Banacha 2C, 02-097, Warsaw, Poland.,Faculty of Chemistry, University of Warsaw, L. Pasteura 1, 02-093, Warsaw, Poland
| | - Ireneusz Tomczyk
- Centre of New Technologies, University of Warsaw, S. Banacha 2C, 02-097, Warsaw, Poland.,Faculty of Chemistry, University of Warsaw, L. Pasteura 1, 02-093, Warsaw, Poland
| | - Aneta Drabinska
- Faculty of Physics, University of Warsaw, L. Pasteura 5, 02-093, Warsaw, Poland
| | - Krzysztof Bienkowski
- Centre of New Technologies, University of Warsaw, S. Banacha 2C, 02-097, Warsaw, Poland
| | - Renata Solarska
- Centre of New Technologies, University of Warsaw, S. Banacha 2C, 02-097, Warsaw, Poland
| | - Marcin Kalek
- Centre of New Technologies, University of Warsaw, S. Banacha 2C, 02-097, Warsaw, Poland
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32
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Wu J, Zhang J, Soto-Acosta R, Mao L, Lian J, Chen K, Pillon G, Zhang G, Geraghty RJ, Zheng S. One-Pot Synthesis of 1-Hydroxyacridones from para-Quinols and ortho-Methoxycarbonylaryl Isocyanates. J Org Chem 2020; 85:4515-4524. [PMID: 32070098 DOI: 10.1021/acs.joc.9b03307] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A variety of substituted acridones were synthesized via a one-pot, metal-free cascade reaction. In this event, the DBU-mediated addition between quinols and ortho-methoxycarbonylaryl isocyanates formed a bicyclic oxazolidinone, followed by a sequence of intramolecular condensation, tautomerization, and decarboxylation, which led to the formation of acridones. The acridones showed mild activity against the human cytomegalovirus.
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Affiliation(s)
- Jing Wu
- Department of Chemistry, Hunter College, 695 Park Avenue, New York, New York 10065, United States.,Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, United States
| | - Jinzhu Zhang
- Department of Chemistry, Hunter College, 695 Park Avenue, New York, New York 10065, United States.,Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, United States
| | - Ruben Soto-Acosta
- Center for Drug Design, University of Minnesota, 312 Church Street SE, MMC 204, Minneapolis, Minnesota 55455, United States
| | - Lili Mao
- Center for Drug Design, University of Minnesota, 312 Church Street SE, MMC 204, Minneapolis, Minnesota 55455, United States
| | - Jiahui Lian
- Department of Chemistry, Hunter College, 695 Park Avenue, New York, New York 10065, United States
| | - Kenny Chen
- Department of Chemistry, Hunter College, 695 Park Avenue, New York, New York 10065, United States
| | - Guy Pillon
- Department of Chemistry, Hunter College, 695 Park Avenue, New York, New York 10065, United States
| | - Guoqi Zhang
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, United States.,Department of Sciences, John Jay College of Criminal Justice, 524 West 59th Street, New York, New York 10019, United States
| | - Robert J Geraghty
- Center for Drug Design, University of Minnesota, 312 Church Street SE, MMC 204, Minneapolis, Minnesota 55455, United States
| | - Shengping Zheng
- Department of Chemistry, Hunter College, 695 Park Avenue, New York, New York 10065, United States.,Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, United States
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33
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Abazid AH, Nachtsheim BJ. A Triazole-Substituted Aryl Iodide with Omnipotent Reactivity in Enantioselective Oxidations. Angew Chem Int Ed Engl 2020; 59:1479-1484. [PMID: 31600009 PMCID: PMC7003988 DOI: 10.1002/anie.201912023] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 10/10/2019] [Indexed: 12/29/2022]
Abstract
A widely applicable triazole‐substituted chiral aryl iodide is described as catalyst for enantioselective oxidation reactions. The introduction of a substituent in ortho‐position to the iodide is key for its high reactivity and selectivity. Besides a robust and modular synthesis, the main advantage of this catalyst is the excellent performance in a plethora of mechanistically diverse enantioselective transformations, such as spirocyclizations, phenol dearomatizations, α‐oxygenations, and oxidative rearrangements. DFT‐calculations of in situ generated [hydroxy(tosyloxy)iodo]arene isomers give an initial rational for the observed reactivity.
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Affiliation(s)
- Ayham H Abazid
- Institut für Organische und Analytische Chemie, Universität Bremen, Leobener Straße 7, 28359, Bremen, Germany
| | - Boris J Nachtsheim
- Institut für Organische und Analytische Chemie, Universität Bremen, Leobener Straße 7, 28359, Bremen, Germany
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34
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A Triazole‐Substituted Aryl Iodide with Omnipotent Reactivity in Enantioselective Oxidations. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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35
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Abstract
Asymmetric organocatalytic oxidations have been witnessed to an impressive development in the last years thanks to the establishment of important chiral hypervalent iodines(III/V). Many different approaches involving both stoichiometric and catalytic versions have provided a fundamental advance in this area within asymmetric synthesis. The easily handing, nontoxic, mild, environmentally friendly (green oxidants), and high stability that are features of these reagents have been applied to many reactions and also have allowed exploring further unprecedented enantioselective transformations. The intention of the present review is thus to highlight as a whole the many approaches utilized up to date to prepare chiral iodines(III/V), as well as their reactivity in a comprehensive manner.
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Affiliation(s)
- Alejandro Parra
- Facultad de Ciencias, Departamento de Química Orgánica, Institute for Advance Research in Chemical Sciences (IAdChem) Universidad Autónoma de Madrid , 28049 Madrid , Spain
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36
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Uyanik M, Kato T, Sahara N, Katade O, Ishihara K. High-Performance Ammonium Hypoiodite/Oxone Catalysis for Enantioselective Oxidative Dearomatization of Arenols. ACS Catal 2019. [DOI: 10.1021/acscatal.9b04322] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Muhammet Uyanik
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Takehiro Kato
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Naoto Sahara
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Outa Katade
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Kazuaki Ishihara
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
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37
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Abstract
The main purpose of this work was to discover the way to obtain pure enantiomers of indan-1-ol. The subject of the study was the ability of the plant enzyme system to reduce the carbonyl group of indan-1-one, as well as to oxidize the hydroxyl group of racemic indan-1-ol. Locally available fruit and vegetables were selected for stereoselective biotransformation. During the reduction, mainly alcohol of the S-(+)-configuration with a high enantiomeric excess (ee = 99%) was obtained. The opposite enantiomer was obtained in bioreduction with the apple and parsley. Racemic indan-1-ol was oxidized by all catalysts. The best result was obtained for the Jerusalem artichoke: Over 50% conversion was observed after 1 h, and the enantiomeric excess of unreacted R-(–)-indan1-ol was 100%.
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38
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Zheng H, Sang Y, Houk KN, Xue XS, Cheng JP. Mechanism and Origins of Enantioselectivities in Spirobiindane-Based Hypervalent Iodine(III)-Induced Asymmetric Dearomatizing Spirolactonizations. J Am Chem Soc 2019; 141:16046-16056. [DOI: 10.1021/jacs.9b08243] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Hanliang Zheng
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Yueqian Sang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - K. N. Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Xiao-Song Xue
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Jin-Pei Cheng
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
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39
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Yoshimatsu S, Nakata K. Silylative Kinetic Resolution of Racemic 2,2‐Dialkyl 5‐ and 6‐Membered Cyclic Benzylic Alcohol Derivatives Catalyzed by Chiral Guanidine, (
R
)‐
N
‐Methylbenzoguanidine. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900761] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shuhei Yoshimatsu
- Department of Chemistry, Graduate School of Natural Science and TechnologyShimane University 1060 Nishikawatsu Matsue Shimane 690-8504 Japan
| | - Kenya Nakata
- Department of Chemistry, Graduate School of Natural Science and TechnologyShimane University 1060 Nishikawatsu Matsue Shimane 690-8504 Japan
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40
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Xing Q, Liang H, Bao M, Li X, Zhang J, Bi T, Zhang Y, Xu J, Du Y, Zhao K. Metal‐free Synthesis of Spiro‐2,2′‐benzo[
b
]furan‐3,3′‐ones
via
PhI(OAc)
2
‐Mediated Cascade Spirocyclization. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900652] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Qingyu Xing
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and TechnologyTianjin University Tianjin 300072 People's Republic of China
| | - Huiyuan Liang
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and TechnologyTianjin University Tianjin 300072 People's Republic of China
| | - Mingmai Bao
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and TechnologyTianjin University Tianjin 300072 People's Republic of China
| | - Xuemin Li
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and TechnologyTianjin University Tianjin 300072 People's Republic of China
| | - Jingran Zhang
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and TechnologyTianjin University Tianjin 300072 People's Republic of China
| | - Tianhao Bi
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and TechnologyTianjin University Tianjin 300072 People's Republic of China
| | - Yilin Zhang
- C. Eugene Bennett Department of ChemistryWest Virginia University Morgantown, West Virginia 26506-6045 United States
| | - Jun Xu
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and TechnologyTianjin University Tianjin 300072 People's Republic of China
| | - Yunfei Du
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and TechnologyTianjin University Tianjin 300072 People's Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 People's Republic of China
| | - Kang Zhao
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and TechnologyTianjin University Tianjin 300072 People's Republic of China
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41
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Yi JC, Wu ZJ, You SL. Rh-Catalyzed Aminative Dearomatization of Naphthols with Hydroxylamine-O
-Sulfonic Acid (HOSA). European J Org Chem 2019. [DOI: 10.1002/ejoc.201900917] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Ji-Cheng Yi
- State Key Laboratory of Organometallic Chemistry; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry, Chinese Academy of Science; 345 Lingling Lu 200032 Shanghai China
- Center for Excellence in Molecular Synthesis; School of Physical Science and Technology; 100 Haike Road 201210 Shanghai China
| | - Zhi-Jie Wu
- State Key Laboratory of Organometallic Chemistry; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry, Chinese Academy of Science; 345 Lingling Lu 200032 Shanghai China
- Center for Excellence in Molecular Synthesis; School of Physical Science and Technology; 100 Haike Road 201210 Shanghai China
| | - Shu-Li You
- State Key Laboratory of Organometallic Chemistry; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry, Chinese Academy of Science; 345 Lingling Lu 200032 Shanghai China
- Center for Excellence in Molecular Synthesis; School of Physical Science and Technology; 100 Haike Road 201210 Shanghai China
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42
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Yi J, Wu Z, You S. Copper‐Catalyzed Oxidative Dearomatization of 2‐Naphthols
via
Etherification. CHINESE J CHEM 2019. [DOI: 10.1002/cjoc.201900242] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ji‐Cheng Yi
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic ChemistryChinese Academy of Sciences 345 Lingling Lu, Shanghai 200032 China
- School of Physical Science and TechnologyShanghaiTech University 100 Haike Road, Shanghai 201210 China
| | - Zhi‐Jie Wu
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic ChemistryChinese Academy of Sciences 345 Lingling Lu, Shanghai 200032 China
- School of Physical Science and TechnologyShanghaiTech University 100 Haike Road, Shanghai 201210 China
| | - Shu‐Li You
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic ChemistryChinese Academy of Sciences 345 Lingling Lu, Shanghai 200032 China
- School of Physical Science and TechnologyShanghaiTech University 100 Haike Road, Shanghai 201210 China
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43
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Yao ZL, Wang L, Shao NQ, Guo YL, Wang DH. Copper-Catalyzed ortho-Selective Dearomative C–N Coupling of Simple Phenols with O-Benzoylhydroxylamines. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01317] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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44
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Asymmetric syntheses and applications of planar chiral hypervalent iodine(V) reagents with crown ether backbones. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.06.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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45
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Dockrey SB, Suh CE, Benítez AR, Wymore T, Brooks CL, Narayan ARH. Positioning-Group-Enabled Biocatalytic Oxidative Dearomatization. ACS CENTRAL SCIENCE 2019; 5:1010-1016. [PMID: 31263760 PMCID: PMC6598382 DOI: 10.1021/acscentsci.9b00163] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Indexed: 05/21/2023]
Abstract
Biocatalysts have the potential to perform reactions with exceptional selectivity and high catalytic efficiency while utilizing safe and sustainable reagents. Despite these positive attributes, the utility of a biocatalyst can be limited by the breadth of substrates that can be accommodated in the active site in a reactive pose. Proven strategies exist for optimizing the performance of a biocatalyst toward unnatural substrates, including protein engineering; however, these methods can be time intensive and require specialized equipment that renders these approaches inaccessible to synthetic chemists. Strategies accessible to chemists for the expansion of a natural enzyme's substrate scope, while maintaining high levels of site- and stereoselectivity, remain elusive. Here, we employ a computationally guided substrate engineering strategy to expand the synthetic utility of a flavin-dependent monooxygenase. Specifically, experimental observations and computational modeling led to the identification of a critical interaction between the substrate and protein which is responsible for orienting the substrate in a pose productive for catalysis. The fundamental hypothesis for this positioning group strategy is supported by binding and kinetic assays as well as computational studies with a panel of compounds. Further, incorporation of this positioning group into substrates through a cleavable ester linkage transformed compounds not oxidized by the biocatalyst SorbC into substrates efficiently oxidatively dearomatized by the wild-type enzyme with the highest levels of site- and stereoselectivity known for this transformation.
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Affiliation(s)
- Summer
A. Baker Dockrey
- Department
of Chemistry, Life Sciences Institute, Program in Chemical Biology, and Department of
Biophysics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Carolyn E. Suh
- Department
of Chemistry, Life Sciences Institute, Program in Chemical Biology, and Department of
Biophysics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Attabey Rodríguez Benítez
- Department
of Chemistry, Life Sciences Institute, Program in Chemical Biology, and Department of
Biophysics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Troy Wymore
- Department
of Chemistry, Life Sciences Institute, Program in Chemical Biology, and Department of
Biophysics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Charles L. Brooks
- Department
of Chemistry, Life Sciences Institute, Program in Chemical Biology, and Department of
Biophysics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Alison R. H. Narayan
- Department
of Chemistry, Life Sciences Institute, Program in Chemical Biology, and Department of
Biophysics, University of Michigan, Ann Arbor, Michigan 48109, United States
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46
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Hokamp T, Wirth T. Structurally Defined α-Tetralol-Based Chiral Hypervalent Iodine Reagents. J Org Chem 2019; 84:8674-8682. [DOI: 10.1021/acs.joc.9b01315] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Tobias Hokamp
- School of Chemistry, Cardiff University, Main Building,
Park Place, Cardiff CF10 3AT, U.K
| | - Thomas Wirth
- School of Chemistry, Cardiff University, Main Building,
Park Place, Cardiff CF10 3AT, U.K
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47
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Rodríguez Benítez A, Tweedy SE, Baker Dockrey SA, Lukowski AL, Wymore T, Khare D, Brooks CL, Palfey BA, Smith JL, Narayan ARH. Structural basis for selectivity in flavin-dependent monooxygenase-catalyzed oxidative dearomatization. ACS Catal 2019; 9:3633-3640. [PMID: 31346489 DOI: 10.1021/acscatal.8b04575] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Biocatalytic reactions embody many features of ideal chemical transformations, including the potential for impeccable selectivity, high catalytic efficiency, mild reaction conditions and the use of environmentally benign reagents. These advantages have created a demand for biocatalysts that expand the portfolio of complexity-generating reactions available to synthetic chemists. However, the tradeoff that often exists between the substrate scope of a biocatalyst and its selectivity limits the application of enzymes in synthesis. We recently demonstrated that a flavin-dependent monooxygenase, TropB, maintains high levels of site- and stereoselectivity across a range of structurally diverse substrates. Herein, we disclose the structural basis for substrate binding in TropB, which performs a synthetically challenging asymmetric oxidative dearomatization reaction with exquisite site- and stereoselectivity across a range of phenol substrates, providing a foundation for future protein engineering and reaction development efforts. Our hypothesis for substrate binding is informed by a crystal structure of TropB and molecular dynamics simulations with the corresponding computational TropB model and is supported by experimental data. In contrast to canonical class A FAD-dependent monooxygenases in which substrates bind in a protonated form, our data indicate that the phenolate form of the substrate binds in the active site. Furthermore, the substrate position is controlled through twopoint binding of the phenolate oxygen to Arg206 and Tyr239, which are shown to have distinct and essential roles in catalysis. Arg206 is involved in the reduction of the flavin cofactor, suggesting a role in flavin dynamics. Further, QM/MM simulations reveal the interactions that govern the facial selectivity that leads to a highly enantioselective transformation. Thus, the structural origins of the high levels of site-and stereoselectivity observed in reactions of TropB across a range of substrates are elucidated, providing a foundation for future protein engineering and reaction development efforts.
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48
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Ganji B, Ariafard A. DFT mechanistic investigation into phenol dearomatization mediated by an iodine(iii) reagent. Org Biomol Chem 2019; 17:3521-3528. [PMID: 30892343 DOI: 10.1039/c9ob00028c] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Density functional theory (DFT) was utilized to investigate the mechanistic aspects of the oxidative dearomatization of phenols mediated by an iodine(iii) reagent. In this article, we will show that the conventional mechanism in which an iodine(iii) phenolate is proposed as the key intermediate is not operative, and the process is promoted if the phenolate ligand is dearomatized on the iodine(iii) center. The dearomatized phenolate is calculated to be a more potent reductant than phenolate itself. In such a case, the reaction is capable of proceeding via two competitive mechanisms (dissociative and associative). Consistent with the experimental findings, we found that while the less polar solvents considerably disfavor the dissociative mechanism, they have an insignificant effect on the associative one. The energetic order of these two mechanisms is calculated to be influenced by the nature of the counter anion coordinated to the iodine(iii) center.
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Affiliation(s)
- Babak Ganji
- Department of Chemistry, Islamic Azad University, Central Tehran Branch, Poonak, Tehran, Iran
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49
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Xu G, Chen P, Liu P, Tang S, Zhang X, Sun J. Access to N-Substituted 2-Pyridones by Catalytic Intermolecular Dearomatization and 1,4-Acyl Transfer. Angew Chem Int Ed Engl 2018; 58:1980-1984. [DOI: 10.1002/anie.201812937] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 12/04/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Guangyang Xu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Ping Chen
- Lab of Computational Chemistry and Drug Design; State Key Laboratory of Chemical Oncogeomics; Peking University Shenzhen Graduate School; Shenzhen 518055 China
| | - Pei Liu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Shengbiao Tang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Xinhao Zhang
- Lab of Computational Chemistry and Drug Design; State Key Laboratory of Chemical Oncogeomics; Peking University Shenzhen Graduate School; Shenzhen 518055 China
| | - Jiangtao Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
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50
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Xu G, Chen P, Liu P, Tang S, Zhang X, Sun J. Access to N-Substituted 2-Pyridones by Catalytic Intermolecular Dearomatization and 1,4-Acyl Transfer. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201812937] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Guangyang Xu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Ping Chen
- Lab of Computational Chemistry and Drug Design; State Key Laboratory of Chemical Oncogeomics; Peking University Shenzhen Graduate School; Shenzhen 518055 China
| | - Pei Liu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Shengbiao Tang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Xinhao Zhang
- Lab of Computational Chemistry and Drug Design; State Key Laboratory of Chemical Oncogeomics; Peking University Shenzhen Graduate School; Shenzhen 518055 China
| | - Jiangtao Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
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