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Gi M, Oh D, Yang S, Lee J, Jung SH, Baek JH, Ha MW, Lee G, Park HG. Enantioselective Michael addition of 3-hydroxy-2-pyridone to nitroolefins using cinchona-derived bifunctional organocatalysts. Org Biomol Chem 2024; 22:7017-7023. [PMID: 39139027 DOI: 10.1039/d4ob01042f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
Despite the extensive use of N-heteroarenes in pharmaceuticals and natural products, efficient methods for selective alkylation at the C-4 position of 2-pyridone are scarce. We developed an enantioselective Michael addition of 3-hydroxy-2-pyridone to nitroolefins at the C-4 position using cinchona-derived bifunctional squaramide organocatalysts, achieving up to 95% yield and >99% ee. This selectivity is driven by the bifunctional organocatalysts' hydrogen bonding interactions with 3-hydroxy-2-pyridone and nitroolefins under mild conditions. This method demonstrates the Michael reaction's versatility with various nitroolefins, providing a sustainable approach for synthesizing chiral N-heteroarenes with high enantioselectivity and regioselectivity under environmentally friendly conditions.
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Affiliation(s)
- Minseok Gi
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 08826, Korea.
| | - Daehyun Oh
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 08826, Korea.
| | - Sehun Yang
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 08826, Korea.
| | - Jaeyong Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 08826, Korea.
| | - So Hyun Jung
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 08826, Korea.
| | - Ju Ha Baek
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 08826, Korea.
| | - Min Woo Ha
- Jeju Research Institute of Pharmaceutical Sciences, College of Pharmacy, Jeju National University, Jeju 63243, Republic of Korea
| | - Geumwoo Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 08826, Korea.
| | - Hyeung-Geun Park
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 08826, Korea.
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2
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Iino Y, Matsushima Y, Nakashima K, Hirashima SI, Miura T. Organocatalyzed Synthesis of γ-Alkenyl Butenolides via Asymmetric Direct Vinylogous Conjugate Addition-Elimination of Substituted Furanone Derivatives to β-Phenylsulfonylenones. J Org Chem 2024; 89:11789-11795. [PMID: 39093710 DOI: 10.1021/acs.joc.4c01218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
A diaminomethylenemalononitrile organocatalyst efficiently promoted the asymmetric direct vinylogous conjugate addition of α-angelica lactone derivatives to β-phenylsulfonylenones, affording the corresponding γ-alkenyl γ-butenolides in high yields with excellent enantioselectivities (up to 97% ee) after the elimination of the phenylsulfonyl group. This study reports the first successful example of a stereoselective reaction using β-phenylsulfonylenone as the direct alkenyl donor.
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Affiliation(s)
- Yuta Iino
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Yasuyuki Matsushima
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Kosuke Nakashima
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Shin-Ichi Hirashima
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Tsuyoshi Miura
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
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3
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Deng M, Yang J, Kong Z, Li Y, Wang Q, Liu H, Deng SZ, Li N. Manganese/Enzyme Sequential Catalytic Pathway for the Production of Optically Active γ-Functionalized Alcohols. J Org Chem 2024; 89:9103-9109. [PMID: 38842047 DOI: 10.1021/acs.joc.4c00776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
A brief, practical catalytic process for the production of optically active γ-functionalized alcohols from relevant alkenes has been developed by using a robust Mn(III)/air/(Me2SiH)2O catalytic system combined with lipase-catalyzed kinetic resolution. This approach demonstrates exceptional tolerance toward proximal functional groups present on alkenes, enabling the achievement of high yields and exclusive enantioselectivity. Under this sequential catalytic system, the chiral alkene precursors can also be converted into γ-functionalized alcohols and related acetates as separable single enantiomers.
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Affiliation(s)
- Meng Deng
- College of Food and Drug, Luoyang Normal University, Luoyang, Henan Province 471934, China
| | - Jiaqi Yang
- College of Food and Drug, Luoyang Normal University, Luoyang, Henan Province 471934, China
| | - Zhiyi Kong
- College of Food and Drug, Luoyang Normal University, Luoyang, Henan Province 471934, China
| | - Yaning Li
- College of Food and Drug, Luoyang Normal University, Luoyang, Henan Province 471934, China
| | - Quanpeng Wang
- College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, Henan Province 471934, China
| | - Huan Liu
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, Henan Province 471023, China
| | - Shu-Zhen Deng
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, Henan Province 471023, China
| | - Nan Li
- College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, Henan Province 471934, China
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4
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Ha HJ. Recent advances in synthesizing and utilizing nitrogen-containing heterocycles. Front Chem 2023; 11:1279418. [PMID: 38025071 PMCID: PMC10646977 DOI: 10.3389/fchem.2023.1279418] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 10/13/2023] [Indexed: 12/01/2023] Open
Abstract
The use of organocatalysts and a pot economy has strengthened recent organic syntheses. Synthetic methodologies may be applicable in laboratory preparation or in the industrial production of valuable organic compounds. In most cases, synthetic challenges are overcome by highly efficient and environmentally benign organocatalysts in a pot-economical manner. This is exemplified by the recent synthesis of tetrahydropyridine-containing (-)-quinine.
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Affiliation(s)
- Hyun-Joon Ha
- Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Republic of Korea
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5
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Magham LR, Thopate SB, Samad A, Chegondi R. Enantioselective Desymmetrization Triggered by Iminium-Enamine Activation: Access to Complex Cyclohepta[b]indoles. Chemistry 2023; 29:e202203435. [PMID: 36530064 DOI: 10.1002/chem.202203435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/14/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022]
Abstract
The expeditious construction of complex molecules having multiple stereocentres is highly desirable in organic chemistry. In the present communication, we report the development of an organocatalytic asymmetric desymmetrization of prochiral enal-tethered cyclohexadienones via the C3-selective Friedel-Crafts alkylation of indoles triggered by LUMO-lowering iminium activation/HOMO-raising enamine activation. The reaction provides access to bicyclic enones, which further undergo acid-mediated intramolecular annulation from C2-position to afford highly strained cyclohepta[b]indoles with five contiguous stereocentres and three new C-C bonds in excellent enantioselectivity and diastereoselectivity.
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Affiliation(s)
- Lakshmi Revati Magham
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, 500007, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
| | - Satish B Thopate
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, 500007, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
| | - Abdus Samad
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, 500007, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
| | - Rambabu Chegondi
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, 500007, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
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6
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Tsuyusaki R, Nakashima K, Shimomura M, Kawada M, Matsushima Y, Hirashima SI, Miura T. Highly efficient, asymmetric, and organocatalyst-based Henry reactions between α,β-unsaturated trifluoromethyl ketone and nitromethane. Tetrahedron Lett 2023. [DOI: 10.1016/j.tetlet.2023.154375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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7
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Catalytic Efficiency of Primary α-Amino Amides as Multifunctional Organocatalysts in Recent Asymmetric Organic Transformations. Catalysts 2022. [DOI: 10.3390/catal12121674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Chiral primary α-amino amides, consisting of an adjacent enamine bonding site (Bronsted base site), a hydrogen bonding site (Bronsted acid site), and flexible bulky substituent groups to modify the steric factor, are proving to be extremely valuable bifunctional organocatalysts for a wide range of asymmetric organic transformations. Primary α-amino amides are less expensive alternatives to other primary amino organocatalysts, such as chiral diamines and cinchona-alkaloid-derived primary amines, as they are easy to synthesize, air-stable, and allow for the incorporation of a variety of functional groups. In recent years, we have demonstrated the catalytic use of simple primary α-amino amides and their derivatives as organocatalysts for the aldol reaction, Strecker reaction, Michael tandem reaction, allylation of aldehydes, reduction of N-Aryl mines, opening of epoxides, hydrosilylation, asymmetric hydrogen transfer, and N-specific nitrosobenzene reaction with aldehydes.
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8
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Sachdeva G, Vaya D, Srivastava CM, Kumar A, Rawat V, Singh M, Verma M, Rawat P, Rao GK. Calix[n]arenes and its derivatives as organocatalysts. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Wu J, Young CM, Watts AA, Slawin AMZ, Boyce GR, Bühl M, Smith AD. Isothiourea-Catalyzed Enantioselective Michael Addition of Malonates to α,β-Unsaturated Aryl Esters. Org Lett 2022; 24:4040-4045. [PMID: 35652512 PMCID: PMC9278409 DOI: 10.1021/acs.orglett.2c01486] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
An enantioselective Michael addition of malonates to α,β-unsaturated para-nitrophenyl esters was achieved using the Lewis basic isothiourea HyperBTM, giving excellent levels of product enantioselectivity (up to >99:1 enantiomeric ratio) in good yields and with complete regioselectivity (>20:1 regioselectivity ratio) in the presence of alternative (phenyl ketone and ethyl ester) Michael acceptors. Density functional theory calculations indicate that N-acylation is rate-limiting. This constitutes a rare example of a highly enantioselective addition of simple, readily available malonates to α,β-unsaturated esters.
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Affiliation(s)
- Jiufeng Wu
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, United Kingdom
| | - Claire M Young
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, United Kingdom
| | - Amy A Watts
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, United Kingdom
| | - Alexandra M Z Slawin
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, United Kingdom
| | - Gregory R Boyce
- Department of Chemistry and Physics, Florida Gulf Coast University, Fort Myers, Florida 33965, United States
| | - Michael Bühl
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, United Kingdom
| | - Andrew D Smith
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, United Kingdom
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10
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Sharma D, Chatterjee R, Dhayalan V, Dandela R. Recent Advances in Enantioselective Organocatalytic Reactions Enabled by NHCs Containing Triazolium Motifs. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1856-5688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
N-Heterocyclic carbenes (NHCs) containing triazolium motifs have emerged as a powerful tool in organocatalysis. Recently, various NHC pre-catalyst mediated organic transformations have been developed successfully. This article aims to compile the current state of knowledge on NHC-triazolium catalysed enantioselective name reactions and introduce newly developed catalytic methods. Furthermore, this review article framework provides an excellent opportunity to highlight some of the unique applications of these catalytic procedures in the natural product synthesis of biologically active compounds, notably the wide range of preparation of substituted chiral alcohols, and their derivatives. This article provides an overview of chiral NHC triazolium-catalyst libraries synthesis and their catalytic application in enantioselective reactions.
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Affiliation(s)
- Deepika Sharma
- Dept. of Industrial and Engineering Chemistry, Institute of Chemical Technology, Indian oil Odisha Campus, Bhubaneswar-, Bhubaneswar, India
| | - Rana Chatterjee
- Chemistry, Institute of Chemical Technology, Indian oil Odisha Campus, Bhubaneswar, Bhubaneswar, India
| | | | - Rambabu Dandela
- Dept. of Industrial and Engineering Chemistry, Institute of Chemical Technology- IOC Bhubaneswar, Bhubaneswar, India
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11
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Cruz H, Servín FA, Aguirre G, Pérez S, Madrigal D, Chávez D, Cooksy AL, Somanathan R. Chiral C 2 -symmetric bis-thioureas as enzyme mimics in enantioselective Michael addition. Chirality 2022; 34:877-886. [PMID: 35303374 DOI: 10.1002/chir.23438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 02/02/2022] [Accepted: 02/28/2022] [Indexed: 11/08/2022]
Abstract
We report herein the synthesis and application of enantiopure C2 -symmetric primary amine-1,3-bis-thiourea organocatalysts in enantioselective conjugate 1,4-Michael addition of carbonyl containing nucleophiles, to nitroalkenes and N-phenylmaleimide, leading to final products in good enantioselectivities (up to 99%) and yields (up to 99%). We propose supramolecular noncovalent interactions within the organocatalyst's cleft between the substrate and the catalyst, via hydrogen bonding. Supramolecular interaction thus lowers the transition state energy mimicking an enzyme. Mechanism underlying our experimental results is supported by theorical calculations.
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Affiliation(s)
- Harold Cruz
- Centro de Graduados e Investigación en Química, Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, Tijuana, Mexico
| | - Felipe A Servín
- Centro de Graduados e Investigación en Química, Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, Tijuana, Mexico
| | - Gerardo Aguirre
- Centro de Graduados e Investigación en Química, Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, Tijuana, Mexico
| | - Sergio Pérez
- Centro de Graduados e Investigación en Química, Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, Tijuana, Mexico
| | - Domingo Madrigal
- Centro de Graduados e Investigación en Química, Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, Tijuana, Mexico
| | - Daniel Chávez
- Centro de Graduados e Investigación en Química, Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, Tijuana, Mexico
| | - Andrew L Cooksy
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California, USA
| | - Ratnasamy Somanathan
- Centro de Graduados e Investigación en Química, Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, Tijuana, Mexico
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12
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Ishii D, Hirashima S, Akutsu H, Nakashima K, Matsushima Y, Sakai T, Miura T. Asymmetric Direct Vinylogous Conjugate Addition of Substituted Furanone Derivatives to (
E
)‐ and (
Z)
‐Benzoyl Acrylonitriles Using Organocatalysts. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200048] [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)
- Daiki Ishii
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Shin‐ichi Hirashima
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Hiroshi Akutsu
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Kosuke Nakashima
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Yasuyuki Matsushima
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Takaaki Sakai
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Tsuyoshi Miura
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
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13
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Nakashima K, Minai A, Okuaki Y, Matsushima Y, Hirashima SI, Miura T. Organocatalytic one-pot asymmetric synthesis of 6-trifluoromethyl-substituted 7,8-dihydrochromen-6-ol. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153733] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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15
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Hussain Y, Tamanna, Sharma M, Kumar A, Chauhan P. Recent development in asymmetric organocatalytic domino reactions involving 1,6-addition as a key step. Org Chem Front 2022. [DOI: 10.1039/d1qo01561c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This article highlights the significant development in stereoselective domino reactions involving 1,6-addition as a crucial step.
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Affiliation(s)
- Yaseen Hussain
- Department of Chemistry, Indian Institute of Technology Jammu, Jagti, NH-44, Nagrota Bypass, Jammu, 181221, J&K, India
| | - Tamanna
- Department of Chemistry, Indian Institute of Technology Jammu, Jagti, NH-44, Nagrota Bypass, Jammu, 181221, J&K, India
| | - Manisha Sharma
- Department of Chemistry, Indian Institute of Technology Jammu, Jagti, NH-44, Nagrota Bypass, Jammu, 181221, J&K, India
| | - Akshay Kumar
- Department of Chemistry, DAV University, Pathankot – Jalandhar Road, Jalandhar 144001, Punjab, India
| | - Pankaj Chauhan
- Department of Chemistry, Indian Institute of Technology Jammu, Jagti, NH-44, Nagrota Bypass, Jammu, 181221, J&K, India
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16
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Kawada M, Tsuyusaki R, Nakashima K, Yamada M, Kozakai A, Matsushima Y, Hirashima SI, Miura T. Asymmetric Henry reaction of trifluoromethyl enones with nitromethane using a N,N-dibenzyl diaminomethylenemalononitrile organocatalyst. Chem Asian J 2021; 17:e202101299. [PMID: 34927372 DOI: 10.1002/asia.202101299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/17/2021] [Indexed: 11/10/2022]
Abstract
A novel N,N -dibenzyl diaminomethylenemalononitrile organocatalyst efficiently promoted asymmetric Henry reactions of trifluoromethyl enones with nitromethane, affording corresponding highly functionalized products in high yields with excellent enantioselectivities (up to 90% ee). This study is the first to report the successful example of the asymmetric 1,2-additions of nitromethane to trifluoromethyl enones.
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Affiliation(s)
- Masahiro Kawada
- Tokyo Yakka Daigaku Yakugakubu Daigakuin Yakugaku Kenkyuka, School of Pharmacy, JAPAN
| | - Ryo Tsuyusaki
- Tokyo Yakka Daigaku Yakugakubu Daigakuin Yakugaku Kenkyuka, school of pharmacy, JAPAN
| | - Kosuke Nakashima
- Tokyo Yakka Daigaku Yakugakubu Daigakuin Yakugaku Kenkyuka, School of pharmacy, JAPAN
| | | | | | | | | | - Tsuyoshi Miura
- Tokyo University of Pharmacy and Life Sciences, School of Pharmacy, 1432-1 Horinouchi, Hachioji, 192-0392, Tokyo, JAPAN
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17
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Wang N, Wu Z, Wang J, Ullah N, Lu Y. Recent applications of asymmetric organocatalytic annulation reactions in natural product synthesis. Chem Soc Rev 2021; 50:9766-9793. [PMID: 34286704 DOI: 10.1039/d0cs01124j] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The past two decades have witnessed remarkable growth of asymmetric organocatalysis, which is now a firmly established synthetic tool, serving as a powerful platform for the production of chiral molecules. Ring structures are ubiquitous in organic compounds, and, in the context of natural product synthesis, strategic construction of ring motifs is often crucial, fundamentally impacting the eventual fate of the whole synthetic plan. In this review, we provide a comprehensive and updated summary of asymmetric organocatalytic annulation reactions; in particular, the application of these annulation strategies in natural product synthesis will be highlighted.
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Affiliation(s)
- Nengzhong Wang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.
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18
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Kawada M, Tsuyusaki R, Nakashima K, Akutsu H, Hirashima SI, Matsumoto T, Yanai H, Miura T. Diaminomethylenemalononitrile as a Chiral Single Hydrogen Bond Catalyst: Application to Enantioselective Conjugate Addition of α-Branched Aldehydes. Chem Asian J 2021; 16:2272-2275. [PMID: 34216113 DOI: 10.1002/asia.202100487] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/22/2021] [Indexed: 11/09/2022]
Abstract
An improved diaminomethylenemalononitrile organocatalyst, bearing a N,N-disubstituted structure, promoted enantioselective conjugate addition reaction of α-branched aldehydes with vinyl sulfone, affording adducts with excellent enantioselectivities (up to 96% ee). Mechanistic studies revealed that the diaminomethylenemalononitrile motif holds the vinyl sulfone substrate using a single hydrogen bond accompanied by multiple weak interactions, including electrostatic C-H⋅⋅⋅O interactions.
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Affiliation(s)
- Masahiro Kawada
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Ryo Tsuyusaki
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Kosuke Nakashima
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Hiroshi Akutsu
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Shin-Ichi Hirashima
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Takashi Matsumoto
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Hikaru Yanai
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Tsuyoshi Miura
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
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19
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Novel C2-symmetric phenylglycine derivatives as organocatalysts of the Michael reaction between nitroalkenes and ketones. Russ Chem Bull 2021. [DOI: 10.1007/s11172-021-3163-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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20
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Juaristi E. Recent developments in next generation (S)-proline-derived chiral organocatalysts. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132143] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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21
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Demirbas N, Demirbas A. Organocatalyzed Heterocyclic Transformations In Green Media: A Review. CURRENT ORGANOCATALYSIS 2021. [DOI: 10.2174/2213337207999200805115813] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Background:
Since the discovery of metal-free catalysts or organocatalysts about twenty
years ago, a number of small molecules with different structures have been used to accelerate organic
transformations. With the development of environmental awareness, to obtain highly efficient
scaffolds, scientists have directed their studies towards synthetic methodologies that minimize
or preferably eliminate the formation of waste, avoid toxic solvents and reagents and use renewable
starting materials as far as possible.
Methods:
In this connection, the organocatalytic reactions providing efficiency and selectivity for
most of the transformations have become an endless topic in organic chemistry since several advantages
from both practical and environmental standpoints. Organocatalysts contributing to the transformation
of reactants into products with the least possible waste production, have been serving the
concept of green chemistry.
Results and Conclusion:
Organocatalysts have been classified based on their binding capacity to
the substrate with covalent or noncovalent interactions involving hydrogen bonding and electrostatic
interaction. Diverse types of small organic compounds including proline and its derivatives,
phase-transfer catalysts, (thio)urease, phosphoric acids, sulfones, N-oxides, guanidines, cinchona
derivatives, aminoindanol, and amino acids have been utilized as hydrogen bonding organocatalysts
in different chemical transformations.
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Affiliation(s)
- Neslihan Demirbas
- Karadeniz Technical University, Department of Chemistry, 61080 Trabzon, Turkey
| | - Ahmet Demirbas
- Karadeniz Technical University, Department of Chemistry, 61080 Trabzon, Turkey
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22
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Trubitsõn D, Martõnova J, Kudrjašova M, Erkman K, Järving I, Kanger T. Enantioselective Organocatalytic Michael Addition to Unsaturated Indolyl Ketones. Org Lett 2021; 23:1820-1824. [PMID: 33625233 DOI: 10.1021/acs.orglett.1c00222] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient enantioselective organocatalytic method for the synthesis of N-alkylated indoles with α-branched alkyl substituents from the corresponding unsaturated indolyl ketones via a Michael addition has been developed. The resulting products were obtained in high enantioselectivities and in good yields. Various nucleophiles (nitroalkanes, malononitrile, malonic esters) can be used. The substitution pattern of the indole ring had no significant impact on the reaction outcome. Both electron-withdrawing and electron-donating substituents in any position of the heteroaromatic ring were well-tolerated.
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Affiliation(s)
- Dmitri Trubitsõn
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Jevgenija Martõnova
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Marina Kudrjašova
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Kristin Erkman
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Ivar Järving
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Tõnis Kanger
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
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23
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Delgado JAC, Vicente FEM, de la Torre AF, Fernandes VA, Corrêa AG, Paixão MW. Synthesis of N-alkylated lipopeptides and their application as organocatalysts in asymmetric Michael addition in aqueous environments. NEW J CHEM 2021. [DOI: 10.1039/d1nj01112j] [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
A library of N-alkylated lipopeptide organocatalysts were synthesized through an isocyanide-based multicomponent reaction.
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Affiliation(s)
- José A. C. Delgado
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem)
- Department of Chemistry
- Federal University of São Carlos – UFSCar
- São Carlos
- Brazil
| | - Fidel E. M. Vicente
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem)
- Department of Chemistry
- Federal University of São Carlos – UFSCar
- São Carlos
- Brazil
| | - Alexander F. de la Torre
- Departamento de Química Orgánica
- Facultad de Ciencias Químicas
- Universidad de Concepción
- Concepción
- Chile
| | - Vitor A. Fernandes
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem)
- Department of Chemistry
- Federal University of São Carlos – UFSCar
- São Carlos
- Brazil
| | - Arlene G. Corrêa
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem)
- Department of Chemistry
- Federal University of São Carlos – UFSCar
- São Carlos
- Brazil
| | - Márcio W. Paixão
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem)
- Department of Chemistry
- Federal University of São Carlos – UFSCar
- São Carlos
- Brazil
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24
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Kim B, Kim Y, Lee SY. Stereodivergent Carbon-Carbon Bond Formation between Iminium and Enolate Intermediates by Synergistic Organocatalysis. J Am Chem Soc 2020; 143:73-79. [PMID: 33356216 DOI: 10.1021/jacs.0c11077] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We report here a stereodivergent method for the Michael addition of aryl acetic acid esters to α,β-unsaturated aldehydes catalyzed by a combination of a chiral pyrrolidine and a chiral Lewis base. This reaction proceeds through a synergistic catalytic cycle which consists of one cycle leading to a chiral iminium electrophile and a second cycle generating a nucleophilic chiral enolate for the construction of a carbon-carbon bond. By varying the combinations of catalyst enantiomers, all four stereoisomers of the products with two vicinal stereocenters are accessible with high enantio- and diastereoselectivity. The products of the Michael addition, 1,5-aldehyde esters, can be readily transformed into a variety of other valuable enantioenriched structures, including those bearing three contiguous stereocenters in an acyclic system, thus providing an efficient route to an array of structural and stereochemical diversity.
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Affiliation(s)
- Byungjun Kim
- Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
| | - Yongjae Kim
- Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
| | - Sarah Yunmi Lee
- Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
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25
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Yang X, Zhang L, Liang Y, Wang Y, Shen Y, Xing Q, Qi W, Wang P, Liu X, Yang M, Su R, He M, He Z. Self-Assembled Bio-Organometallic Nanocatalysts for Highly Enantioselective Direct Aldol Reactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:13735-13742. [PMID: 33175547 DOI: 10.1021/acs.langmuir.0c01485] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Supramolecular nanocatalysts were designed for asymmetric reactions through the self-assembly process of a bio-organometallic molecule, ferrocene-l-prolinamide (Fc-CO-NH-P). Fc-CO-NH-P could self-assemble into versatile nanostructures in water, including nanospheres, nanosheets, nanoflowers, and pieces. In particular, the self-assembled nanoflowers exhibited a superior specific surface area, high stability, and delicate three-dimensional (3D) chiral catalytic active sites. The nanoflowers could serve as heterogeneous catalysts with an excellent catalytic performance toward direct aldol reactions in aqueous solution, achieving both high yield (>99%) and stereoselectivity (anti/syn = 97:3, ee% >99%). This study proposed a significant strategy to fabricate supramolecular chiral catalysts, serving as a favorable template for designing new asymmetric catalysts.
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Affiliation(s)
- Xuejiao Yang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Liwei Zhang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Yaoyu Liang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Yuefei Wang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Yuhe Shen
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Qiguo Xing
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Wei Qi
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Pengfei Wang
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 30072, P. R. China
| | - Xiao Liu
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Mengyao Yang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Rongxin Su
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Mingxia He
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 30072, P. R. China
| | - Zhimin He
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
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26
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Li G, Liu M, Zou S, Feng X, Lin L. A Bispidine-Based Chiral Amine Catalyst for Asymmetric Mannich Reaction of Ketones with Isatin Ketimines. Org Lett 2020; 22:8708-8713. [PMID: 33074003 DOI: 10.1021/acs.orglett.0c03305] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A unique chiral amine organocatalyst with a bispidine structure was found to be efficient for the diastereo- and enantioselective Mannich reaction of isatin ketimines with ketones. A series of 3-substituted 3-amino-2-oxindoles bearing vicinal tertiary and quaternary chiral stereogenic centers were obtained in excellent yields with excellent dr and ee values. The gram-scale synthesis and transformation of the product showed the practicability of this methodology. In addition, a possible transition state model was proposed to explain the origin of the stereoselectivity.
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Affiliation(s)
- Gonglin Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Mohuizi Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Sijia Zou
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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27
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Li Y, Fan W, Zhang Z, Xie X, Xiang S, Huang D. Copper(II)-hydroxide facilitated C-C bond formation: the carboxamido pyridine system versus the methylimino pyridine system. Dalton Trans 2020; 49:12189-12196. [PMID: 32930687 DOI: 10.1039/d0dt02288h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A copper(ii)-hydroxide-induced carbon-carbon bond formation reaction is explored with the synthesis of an asymmetric carboxamido-methylimino pyridine Cu(i) complex of [CuI(py(N-C[double bond, length as m-dash]O)(N[double bond, length as m-dash]C-C)ph2Me2)2]- (12). Two imine-methyl groups are coupled to form a bridged C-C bond (N[double bond, length as m-dash]C-C-C-C[double bond, length as m-dash]N) at the methyl positions with the reduction of two Cu2+ center ions to Cu+. The reaction is checked with three dicarboxamido pyridine [CuII-OH] complexes, with which dinuclear Cu(i) complexes of [Cu2(py(N-C[double bond, length as m-dash]O)2ph2R2)2]2- (R = methyl (3), methyl and allyl (6)) and trinuclear [CuII-CuI-CuII] complex of [Cu3(⊂20-py(N-C[double bond, length as m-dash]O)2ph2dienMe3)2]+ (9) are obtained. The reactivities of the [CuII-L] (L = DMF, OH-) complexes in dicarboxamido pyridine, carboxamido-methylimino pyridine and dimethylimino pyridine systems are discussed in terms of the electron delocalization properties of ligands. A cooperative metal-ligand (Cu2+ and enamide ligand) interaction is proposed based on the characterization of ligated Cu(ii) intermediates with the techniques of X-ray crystallography, UV-vis spectroscopy, cyclic voltammogram, EPR spectroscopy, and DFT calculations.
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Affiliation(s)
- Yinghua Li
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
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28
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Abstract
The asymmetric ring-opening of epoxides is an important reaction in organic synthesis, since it allows for the enantioselective installation of two vicinal functional groups with specific stereochemistry within one step from a highly available starting material. An effective class of catalysts for the asymmetric ring-opening of epoxides is metal–salen complexes. This review summarizes the development of metal–salen catalyzed enantioselective desymmetrization of meso-epoxides and kinetic resolution of epoxides with various nucleophiles, including the design and application of both homogeneous- and heterogeneous epoxide-opening catalysts as well as multi-metallic covalent and supramolecular catalytic systems.
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29
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Ling T, Hadi V, Bollinger J, Rivas F. Identification of rapid access to polycyclic systems via a base-catalyzed cascade cyclization reaction and their biological evaluation. Bioorg Chem 2020; 99:103846. [PMID: 32334195 PMCID: PMC7329093 DOI: 10.1016/j.bioorg.2020.103846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 04/08/2020] [Accepted: 04/09/2020] [Indexed: 11/23/2022]
Abstract
A base-mediated cascade reaction between malonate esters and acrolein was developed to access complex polycyclic systems. This novel tandem reaction enables the simultaneous generation of up to seven new bonds and at least three new stereogenic centers. Mechanistic studies indicate a series of nucleophilic 1,4 and 1,6 Michael addition reactions occur, followed by an aldol condensation reaction, culminating in the formation of three fused rings. The compounds were characterized by NMR studies and the stereochemistry was confirmed by X-ray analysis. The ability to generate multigram quantities of such complex molecular scaffolds renders the method promising for medicinal chemistry campaigns. Herein, we also demonstrate that the lead compounds display promising anti-proliferative activities against human cancer cell models.
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Affiliation(s)
- Taotao Ling
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Victor Hadi
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - John Bollinger
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Fatima Rivas
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA.
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30
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Pellissier H. Recent Developments in Enantioselective Multicatalyzed Tandem Reactions. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000210] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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31
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Wititsuwannakul T, Mukherjee T, Hall MB, Gladysz JA. Computational Investigations of Enantioselection in Carbon–Carbon Bond Forming Reactions of Ruthenium Guanidinobenzimidazole Second Coordination Sphere Hydrogen Bond Donor Catalysts. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00072] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Taveechai Wititsuwannakul
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012, United States
| | - Tathagata Mukherjee
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012, United States
| | - Michael B. Hall
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012, United States
| | - John A. Gladysz
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012, United States
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32
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Chen XY, Gao ZH, Ye S. Bifunctional N-Heterocyclic Carbenes Derived from l-Pyroglutamic Acid and Their Applications in Enantioselective Organocatalysis. Acc Chem Res 2020; 53:690-702. [PMID: 32142245 DOI: 10.1021/acs.accounts.9b00635] [Citation(s) in RCA: 204] [Impact Index Per Article: 51.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
In nature, enzymes are a powerful medium for the construction of enantiomerically pure chemicals, which always inspires synthetic chemists to explore new catalysts to imitate the enzyme machinery for asymmetric transformations. Vitamin B1, a bifunctional thiazolium N-heterocyclic carbene (NHC) precursor, is the coenzyme for transketolase. In the past two decades, a series of chiral NHCs, including monocyclic, bicyclic, tetracyclic, and even bridged ones, have been synthesized and successfully utilized as efficient organocatalysts for a wide variety of asymmetric organic reactions. The utility of bifunctional catalysts can enhance catalytic activity and improve stereochemical control through their synchronous activation of both reaction partners. However, the NHCs possessing multiple activation sites are far less developed.This Account gives an overview of our research on the design, development, and applications of bifunctional NHCs in organocatalysis. We synthesized a series of l-pyroglutamic acid-derived bifunctional NHCs bearing a free hydroxyl group which can interact with carbonyl or imino groups via hydrogen-bonding. Further studies revealed that these bifunctional catalysts worked well for a variety of reactions. We have developed bifunctional NHC-catalyzed aza-benzoin reactions, [2 + 2], [2 + 3], and [2 + 4] cycloadditions of ketenes, [3 + 2] and [3 + 4] annulations of enals, and aza-MBH and Rauhut-Currier reactions of Michael acceptors. In addition to these reactions via nucleophilic Breslow intermediates, enolates, homoenolates, and zwitterionic azolium intermediates, the bifunctional NHC-catalyzed [3 + 3] annulation via 1,3-biselectrophilic α,β-unsaturated acyl azolium intermediates was also developed.In these reactions, bifunctional NHCs showed amazing effects compared to normal nonbifunctional NHCs. In some cases, the bifunctional NHCs facilitated reactions which did not work under normal NHC catalysis, possibly due to additional activation via H-bonding. More interestingly, the bifunctional NHCs could not only improve but also switch the enantioselectivity to get products with opposite stereochemistry through H-bond controlled stereochemical directing. Furthermore, the reaction mode could be totally changed from [3 + 2] to [3 + 4] annulation to give kinetically favored products when bifunctional NHCs were employed. In future, the applications of bifunctional NHCs in other challenging reactions, such as asymmetric reactions with carbon-carbon unsaturated bonds, and the reactions involving alkyl or heteroatom radicals will be the major focus in our group.
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Affiliation(s)
- Xiang-Yu Chen
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, 100190 Beijing, China
- School of Chemical Sciences, University of the Chinese Academy of Sciences, 100049 Beijing, China
| | - Zhong-Hua Gao
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, 100190 Beijing, China
| | - Song Ye
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, 100190 Beijing, China
- School of Chemical Sciences, University of the Chinese Academy of Sciences, 100049 Beijing, China
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33
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Asymmetric redox-neutral radical cyclization catalysed by flavin-dependent 'ene'-reductases. Nat Chem 2019; 12:71-75. [PMID: 31792387 PMCID: PMC6925616 DOI: 10.1038/s41557-019-0370-2] [Citation(s) in RCA: 100] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 10/07/2019] [Indexed: 01/08/2023]
Abstract
Flavin-dependent 'ene'-reductases (EREDs) are exquisite catalysts for effecting stereoselective reductions. Although these reactions typically proceed through a hydride transfer mechanism, we recently found that EREDs can also catalyse reductive dehalogenations and cyclizations via single electron transfer mechanisms. Here, we demonstrate that these enzymes can catalyse redox-neutral radical cyclizations to produce enantioenriched oxindoles from α-haloamides. This transformation is a C-C bond-forming reaction currently unknown in nature and one for which there are no catalytic asymmetric examples. Mechanistic studies indicate the reaction proceeds via the flavin semiquinone/quinone redox couple, where ground-state flavin semiquinone provides the electron for substrate reduction and flavin quinone oxidizes the vinylogous α-amido radical formed after cyclization. This mechanistic manifold was previously unknown for this enzyme family, highlighting the versatility of EREDs in asymmetric synthesis.
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34
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Xie X, Xiang L, Peng C, Han B. Catalytic Asymmetric Synthesis of Spiropyrazolones and their Application in Medicinal Chemistry. CHEM REC 2019; 19:2209-2235. [PMID: 30821425 DOI: 10.1002/tcr.201800199] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 02/11/2019] [Accepted: 02/11/2019] [Indexed: 01/24/2023]
Abstract
Chiral spiropyrazolones are unique frameworks widely found in a large family of medicinally relevant compounds with various biological activities. Substantial research efforts have been invested toward stereoselectively by constructing spiro-cyclic structures. Over the past years, remarkable progress has been made in the organo- and metal-catalyzed asymmetric synthesis of spiropyrazolones through the utilization of accessible simple pyrazolone derivatives as raw materials. This review is organized according to the size of the spiro-ring fused at the 4-position of the pyrazolone framework. In the last part, the bio-evaluations of chiral spiropyrazolones for drug discovery are summarized.
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Affiliation(s)
- Xin Xie
- College of Medical Technology and School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Li Xiang
- State Key Laboratory of Southwestern Chinese Medicine Resource, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Cheng Peng
- College of Medical Technology and School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,State Key Laboratory of Southwestern Chinese Medicine Resource, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Bo Han
- College of Medical Technology and School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
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35
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Izquierdo J, Demurget N, Landa A, Brinck T, Mercero JM, Dinér P, Oiarbide M, Palomo C. Asymmetric Synthesis of Adjacent Tri- and Tetrasubstituted Carbon Stereocenters: Organocatalytic Aldol Reaction of an Hydantoin Surrogate with Azaarene 2-Carbaldehydes. Chemistry 2019; 25:12431-12438. [PMID: 31318987 DOI: 10.1002/chem.201902817] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 07/15/2019] [Indexed: 12/13/2022]
Abstract
A bifunctional amine/squaramide catalyst promoted direct aldol addition of an hydantoin surrogate to pyridine 2-carbaldehyde N-oxides to afford adducts bearing two vicinal tertiary/quaternary carbons in high diastereo- and enantioselectivity (d.r. up to >20:1; ee up to 98 %) is reported. Acid hydrolysis of adducts followed by reduction of the N-oxide group yields enantiopure carbinol-tethered quaternary hydantoin-azaarene conjugates with densely functionalized skeletons. DFT studies of the potential energy surface (B3LYP/6-31+G(d)+CPCM (dichloromethane)) of the reaction correlate the activity of different catalysts and support an intramolecular hydrogen-bond-assisted activation of the squaramide moiety in the transition state of the catalytic reaction.
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Affiliation(s)
- June Izquierdo
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018, San Sebastián, Spain
| | - Noémie Demurget
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018, San Sebastián, Spain
| | - Aitor Landa
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018, San Sebastián, Spain
| | - Tore Brinck
- Department of Chemistry, KTH Royal Institute of, Technology, Teknikringen 30, 100 44, Stockholm, Sweden
| | - Jose M Mercero
- Kimika Fakultatea, Euskal Herriko Unibertsitatea, (UPV/EHU) & Donostia International Physics Center (DIPC), Donostia, Spain
| | - Peter Dinér
- Department of Chemistry, KTH Royal Institute of, Technology, Teknikringen 30, 100 44, Stockholm, Sweden
| | - Mikel Oiarbide
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018, San Sebastián, Spain
| | - Claudio Palomo
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018, San Sebastián, Spain
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36
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Bykova KA, Kostenko AA, Kucherenko AS, Zlotin SG. Asymmetric Michael reaction between aldehydes and nitroalkanes promoted by pyrrolidine-containing C2-symmetric organocatalysts. Russ Chem Bull 2019. [DOI: 10.1007/s11172-019-2568-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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37
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Lu H, Zhang HX, Tan CY, Liu JY, Wei H, Xu PF. One-Pot Asymmetric Synthesis of Spiropyrazolone-Linked Cyclopropanes and Benzofurans through a General Michael Addition/Chlorination/Nucleophilic Substitution Sequence. J Org Chem 2019; 84:10292-10305. [DOI: 10.1021/acs.joc.9b01454] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Hong Lu
- State Key Laboratory of Applied Organic Chemistry, School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of the Ministry of Education, National Demonstration Center for Experimental Chemistry Education (Northwest University), College of Chemistry & Materials Science, Northwest University, Xi’an 710127, China
| | - Huan-Xin Zhang
- State Key Laboratory of Applied Organic Chemistry, School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Chang-Yin Tan
- State Key Laboratory of Applied Organic Chemistry, School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Jin-Yu Liu
- State Key Laboratory of Applied Organic Chemistry, School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Hao Wei
- Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of the Ministry of Education, National Demonstration Center for Experimental Chemistry Education (Northwest University), College of Chemistry & Materials Science, Northwest University, Xi’an 710127, China
| | - Peng-Fei Xu
- State Key Laboratory of Applied Organic Chemistry, School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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38
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Otevrel J, Svestka D, Bobal P. Bianthryl-based organocatalysts for the asymmetric Henry reaction of fluoroketones. Org Biomol Chem 2019; 17:5244-5248. [PMID: 31086873 DOI: 10.1039/c9ob00884e] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have developed a catalytic system based on bianthrylbis(thiourea) for the asymmetric Henry reaction of fluoroketones and nitroalkanes that resulted from the screening of a library containing 31 chiral non-racemic organocatalysts. The corresponding adducts were isolated in up to 6 times shorter reaction time in comparison with the previously published organocatalysts. High levels of stereocontrol have been generally observed, with measured product enantiomeric excesses up to 97% and diastereomeric ratio 3 : 2 (anti/syn). The above-mentioned catalysts have been successfully applied to the total asymmetric synthesis of CF3-tethered (S)-halostachines, which has proved that this method constitutes an easy entry to similar enantiopure compounds.
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Affiliation(s)
- Jan Otevrel
- Department of Chemical Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho 1, 612 42 Brno, Czech Republic.
| | - David Svestka
- Department of Chemical Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho 1, 612 42 Brno, Czech Republic.
| | - Pavel Bobal
- Department of Chemical Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Palackeho 1, 612 42 Brno, Czech Republic.
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39
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Sofiadis M, Kalaitzakis D, Sarris J, Montagnon T, Vassilikogiannakis G. Vinylogous Reactivity of Cyclic 2‐Enones: Organocatalysed Asymmetric Addition to 2‐Enals to Synthesize Fused Carbocycles. Angew Chem Int Ed Engl 2019; 58:6742-6746. [DOI: 10.1002/anie.201901902] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 03/06/2019] [Indexed: 12/18/2022]
Affiliation(s)
- Manolis Sofiadis
- Department of ChemistryUniversity of Crete Vasilika Vouton 71003 Iraklion Crete Greece
| | - Dimitris Kalaitzakis
- Department of ChemistryUniversity of Crete Vasilika Vouton 71003 Iraklion Crete Greece
| | - John Sarris
- Department of ChemistryUniversity of Crete Vasilika Vouton 71003 Iraklion Crete Greece
| | - Tamsyn Montagnon
- Department of ChemistryUniversity of Crete Vasilika Vouton 71003 Iraklion Crete Greece
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40
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Sofiadis M, Kalaitzakis D, Sarris J, Montagnon T, Vassilikogiannakis G. Vinylogous Reactivity of Cyclic 2‐Enones: Organocatalysed Asymmetric Addition to 2‐Enals to Synthesize Fused Carbocycles. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901902] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Manolis Sofiadis
- Department of ChemistryUniversity of Crete Vasilika Vouton 71003 Iraklion Crete Greece
| | - Dimitris Kalaitzakis
- Department of ChemistryUniversity of Crete Vasilika Vouton 71003 Iraklion Crete Greece
| | - John Sarris
- Department of ChemistryUniversity of Crete Vasilika Vouton 71003 Iraklion Crete Greece
| | - Tamsyn Montagnon
- Department of ChemistryUniversity of Crete Vasilika Vouton 71003 Iraklion Crete Greece
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41
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Heravi MM, Zadsirjan V, Heydari M, Masoumi B. Organocatalyzed Asymmetric Friedel‐Crafts Reactions: An Update. CHEM REC 2019. [DOI: 10.1002/tcr.201800190] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Majid M. Heravi
- Department of ChemistrySchool of ScienceAlzahra University POBox 1993891176, Vanak Tehran Iran Tel.: +98 21 88044051 fax: +98 21 88041344
| | - Vahideh Zadsirjan
- Department of ChemistrySchool of ScienceAlzahra University POBox 1993891176, Vanak Tehran Iran Tel.: +98 21 88044051 fax: +98 21 88041344
| | - Masumeh Heydari
- Department of ChemistrySchool of ScienceAlzahra University POBox 1993891176, Vanak Tehran Iran Tel.: +98 21 88044051 fax: +98 21 88041344
| | - Baharak Masoumi
- Department of ChemistrySchool of ScienceAlzahra University POBox 1993891176, Vanak Tehran Iran Tel.: +98 21 88044051 fax: +98 21 88041344
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42
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He X, Ji Y, Peng C, Han B. Organocatalytic Asymmetric Synthesis of Cyclic Compounds Bearing a Trifluoromethylated Stereogenic Center: Recent Developments. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201801647] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Xiang‐Hong He
- State Key Laboratory of Southwestern Chinese Medicine ResourcesChengdu University of Traditional Chinese Medicine Chengdu 611137 People's Republic of China
| | - Yan‐Ling Ji
- State Key Laboratory of Southwestern Chinese Medicine ResourcesChengdu University of Traditional Chinese Medicine Chengdu 611137 People's Republic of China
| | - Cheng Peng
- State Key Laboratory of Southwestern Chinese Medicine ResourcesChengdu University of Traditional Chinese Medicine Chengdu 611137 People's Republic of China
- Ministry of Education Key Laboratory of Standardization of Chinese Medicine, School of PharmacyChengdu University of Traditional Chinese Medicine Chengdu 611137 People's Republic of China
| | - Bo Han
- State Key Laboratory of Southwestern Chinese Medicine ResourcesChengdu University of Traditional Chinese Medicine Chengdu 611137 People's Republic of China
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43
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Padmaja VMD, Jangra S, Appayee C. Highly regioselective α-alkylation of α,β,γ,δ-unsaturated aldehydes. Org Biomol Chem 2019; 17:1714-1717. [PMID: 30209495 DOI: 10.1039/c8ob02059k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first α-alkylation of α,β,γ,δ-unsaturated aldehydes is achieved under mild reaction conditions. Several α,β,γ,δ-unsaturated aldehydes and diarylcarbinols are successfully tested for the synthesis of MBH-type α-alkylated products with an excellent regioselectivity. Simple pyrrolidine is efficiently used as a catalyst to achieve a perfect E/Z selectivity of the α-alkylated products.
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Affiliation(s)
- Venkata M D Padmaja
- Discipline of Chemistry, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat 382355, India.
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44
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Reyes-Rodríguez GJ, Rezayee NM, Vidal-Albalat A, Jørgensen KA. Prevalence of Diarylprolinol Silyl Ethers as Catalysts in Total Synthesis and Patents. Chem Rev 2019; 119:4221-4260. [DOI: 10.1021/acs.chemrev.8b00583] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
| | - Nomaan M. Rezayee
- Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
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45
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Heravi MM, Zadsirjan V, Masoumi B, Heydari M. Organometal-catalyzed asymmetric Friedel-Crafts reactions. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2018.10.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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46
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Lan Y, Yang C, Zhang Y, An W, Xue H, Ding S, Zhou P, Wang W. Pyrrolidine-based chiral porous polymers for heterogeneous organocatalysis in water. Polym Chem 2019. [DOI: 10.1039/c9py00326f] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The “bottom-up” reticulation of chiral pyrrolidine into POPs for heterogeneous organocatalysis in pure water.
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Affiliation(s)
- Yubao Lan
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- China
| | - Chunxia Yang
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- China
| | - Yuan Zhang
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- China
| | - Wankai An
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- China
| | - Huadong Xue
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- China
| | - Sanyuan Ding
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- China
| | - Panpan Zhou
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- China
| | - Wei Wang
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou
- China
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47
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Ahmetlli A, Spiliopoulou N, Magi-Oikonomopoulou A, Gerokonstantis DT, Moutevelis-Minakakis P, Kokotos CG. Proline dipeptides containing fluorine moieties as oganocatalysts for the asymmetric aldol reaction. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.08.038] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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48
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Kawada M, Nakashima K, Hirashima SI, Sakagami T, Koseki Y, Miura T. Stereoselective conjugate addition of ketones to alkylidene malonates using thiourea-sulfonamide organocatalyst. Chirality 2018; 30:1215-1224. [PMID: 30211959 DOI: 10.1002/chir.23015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 07/02/2018] [Accepted: 07/25/2018] [Indexed: 11/11/2022]
Abstract
In this study, stereoselective conjugate addition of ketones to alkylidene malonates using organocatalyst has been developed. The reaction in the presence of 20 mol% of a novel thiourea-sulfonamide organocatalyst afforded conjugate adducts in moderate to high yields (up to 81%) under mild reaction conditions. Excellent diastereoselectivity (up to 98:2 dr) and enantioselectivity (up to 88% ee) were achieved.
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Affiliation(s)
- Masahiro Kawada
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Japan
| | - Kosuke Nakashima
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Japan
| | - Shin-Ichi Hirashima
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Japan
| | - Toru Sakagami
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Japan
| | - Yuji Koseki
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Japan
| | - Tsuyoshi Miura
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Japan
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49
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Shen X, Zhao JJ, Yu S. Photoredox-Catalyzed Intermolecular Remote C–H and C–C Vinylation via Iminyl Radicals. Org Lett 2018; 20:5523-5527. [DOI: 10.1021/acs.orglett.8b02540] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Xu Shen
- State Key Laboratory of Analytical Chemistry for Life Science, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Jia-Jia Zhao
- State Key Laboratory of Analytical Chemistry for Life Science, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Shouyun Yu
- State Key Laboratory of Analytical Chemistry for Life Science, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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50
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Yao W, Zhu J, Zhou X, Jiang R, Wang P, Chen W. Ferrocenophane-based bifunctional organocatalyst for highly enantioselective Michael reactions. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.06.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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