1
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Singh S, Kumar R, Dubey NN, Appayee C. Synthesis and application of chiral cis-2,5-disubstituted pyrrolidine organocatalysts. Chem Commun (Camb) 2024. [PMID: 39076133 DOI: 10.1039/d4cc03132f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/31/2024]
Abstract
The first synthesis of chiral cis-2,5-disubstituted pyrrolidine organocatalysts is described. Their application for the enantioselective Michael addition of nitromethane to α,β-unsaturated aldehydes with excellent yield (up to 91%) and enantioselectivity (up to >99% ee) is demonstrated. Another catalytic application for the reaction of 2,4-hexadienal with nitrostyrene is also showcased.
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Affiliation(s)
- Suraj Singh
- Department of Chemistry, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat 382055, India.
| | - Rohtash Kumar
- Department of Chemistry, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat 382055, India.
| | - Navneet Nandgopal Dubey
- Department of Chemistry, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat 382055, India.
| | - Chandrakumar Appayee
- Department of Chemistry, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat 382055, India.
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2
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Li YH, Chen JH, Yang Z. Exo-Selective Diels-Alder Reactions. Chemistry 2024; 30:e202304371. [PMID: 38412422 DOI: 10.1002/chem.202304371] [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: 12/30/2023] [Indexed: 02/29/2024]
Abstract
The Diels-Alder reaction stands as one of the most pivotal transformations in organic chemistry. Its efficiency, marked by the formation of two carbon-carbon bonds and up to four new stereocenters in a single step, underscores its versatility and indispensability in synthesizing natural products and pharmaceuticals. The most significant stereoselectivity feature is the "endo rule". While this rule underpins the predictability of the stereochemical outcomes, it also underscores the challenges in achieving the opposite diastereoselectivity, making the exo-Diels-Alder reactions often considered outliers. This review delves into recent examples of exo-Diels-Alder reactions, shedding light on the factors inverting the intrinsic tendency. We explore the roles of steric, electrostatic, and orbital interactions, as well as thermodynamic equilibriums in influencing exo/endo selectivity. Furthermore, we illustrate strategies to manipulate these factors, employing approaches such as bulky substituents, s-cis conformations, transient structural constraints, and innovative control physics. Through these analyses, our aim is to provide a comprehensive understanding of how to predict and design exo-Diels-Alder reactions, paving the way for new diastereoselective catalyst systems and expanding the chemical scope of Diels-Alder reactions.
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Affiliation(s)
- Yuan-He Li
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China
| | - Jia-Hua Chen
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China
| | - Zhen Yang
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China
- State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen, 518055
- Shenzhen Bay Laboratory, Shenzhen, 518067, China
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3
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Prasad MS, Bharani MS, Jha MAK, Naik MSC, Sivaprakash M, Chowhan LR. Enantioselective Synthesis of Octahydrofuranoindole Core of Aspidosperma Alkaloids via a Diels-Alder/Reduction/Fluoroetherification Reaction Sequence. Chem Asian J 2023; 18:e202300419. [PMID: 37415449 DOI: 10.1002/asia.202300419] [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: 05/13/2023] [Revised: 07/05/2023] [Accepted: 07/06/2023] [Indexed: 07/08/2023]
Abstract
Herein, we disclose the enantioselective synthesis of novel tricyclic fluorooctahydrofuranoindole spirooxindoles bearing five contiguous stereocenters via an organocatalytic sequential Diels-Alder/Reduction/Fluoroetherifiction reaction strategy. The potential of the developed approach was witnessed by generating vast examples (up to 20 examples) of library molecules embedding natural product core with good yields and phenomenal diastereo- and enantioselectivities (up to 77 % overall yield, up to 99 % ee and 10 : 1 dr). The synthetic utility of our protocol was further demonstrated by synthesizing tricyclic iodooctahydroindole spirooxindole framework through sequential Diels-Alder/reduction/iodoetherification reaction in 65 % overall yield and excellent stereoselectivity (99 % ee and 4 : 1 dr).
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Affiliation(s)
- Madavi S Prasad
- Asymmetric synthesis and catalysis laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN)., Tiruvarur, 610 005, India
| | - Ms Sankar Bharani
- Asymmetric synthesis and catalysis laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN)., Tiruvarur, 610 005, India
| | - Mr Aman Kumar Jha
- Asymmetric synthesis and catalysis laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN)., Tiruvarur, 610 005, India
| | - Mr Sugali Chetan Naik
- Asymmetric synthesis and catalysis laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN)., Tiruvarur, 610 005, India
| | - Murugesan Sivaprakash
- Asymmetric synthesis and catalysis laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN)., Tiruvarur, 610 005, India
| | - L Raju Chowhan
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
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4
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Prasad MS, Sivaprakash M, Bharani S, Chowhan LR. Trienamine catalysed unprecedented remote olefin E/ Z isomerisation/[4 + 2]-cycloaddition reaction to access spirooxindole hexahydroindoles. Org Biomol Chem 2023; 21:945-949. [PMID: 36606372 DOI: 10.1039/d2ob02228a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Herein, for the first time, we report the asymmetric synthesis of an unexpected stereoisomer of spirohexahydroindole via a trienamine-catalysed remote olefin E/Z isomerisation/[4 + 2]-cycloaddition reaction. The reaction afforded a vast library of aesthetically pleasing spirooxindole hexahydroindole scaffolds with exceptional enantio- and diastereo-selectivities (up to 95% yield, 99% ee and >99 : 1 dr). In addition, we demonstrated the synthetic transformation of enantiomerically pure spirooxindole hexahydroindoles to synthesize alkyl homologated spirooxindole hexahydroindole and fluoro-pyranooctahydroindole moieties with four and seven contiguous stereocenters, respectively, in excellent yield and selectivities. We have also demonstrated the evidence for the proposed pathway through NMR investigations.
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Affiliation(s)
- Madavi S Prasad
- Asymmetric Synthesis and Catalysis Laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN), Tiruvarur-610 005, India.
| | - Murugesan Sivaprakash
- Asymmetric Synthesis and Catalysis Laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN), Tiruvarur-610 005, India.
| | - Sankar Bharani
- Asymmetric Synthesis and Catalysis Laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN), Tiruvarur-610 005, India.
| | - L Raju Chowhan
- School of Applied Material Sciences, Centre for Applied Chemistry, Central University of Gujarat, Sector-30, Gandhinagar-382030, Gujarat, India
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5
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Prasad MS, Sivaprakash M. Asymmetric synthesis of the perhydroepoxyethanoindole core via sequential [4 + 2]-addition/reduction/fluoroannulation reactions. Org Biomol Chem 2023; 21:339-344. [PMID: 36477116 DOI: 10.1039/d2ob02058k] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Herein, we present the sequential aminocatalytic [4 + 2]-addition/reduction and fluoroannulation reactions to afford a novel class of bridged fluoro-perhydroepoxyethanoindole spiropyrazolone and fluoro-perhydroepoxyethanoindole spirooxindole moieties with six contiguous stereocenters. An array of perhydroepoxyethanoindole core derivatives (up to 31 examples) mimicking aspidosperma alkaloids were obtained with moderate to good yields and excellent enantio- and diastereo-selectivities (up to 69% overall yield, up to 99.9% ee and up to >20 : 1 dr). Furthermore, we have also disclosed the synthesis of the unexpected tribromo derivative of hexahydroepoxyethanoindole spiropyrazolone in a moderate yield with excellent selectivity by employing the developed protocol in sequential bromoannulation reactions.
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Affiliation(s)
- Madavi S Prasad
- Asymmetric synthesis and catalysis laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN), Tiruvarur-610 005, India.
| | - Murugesan Sivaprakash
- Asymmetric synthesis and catalysis laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN), Tiruvarur-610 005, India.
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6
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Prasad MS, Sivaprakash M, Palanichamy A. Aminocatalytic asymmetric [4 + 2]-annulation to access functionally rich hexahydrospiroindole pyrazolones. Org Biomol Chem 2022; 20:6329-6333. [PMID: 35876851 DOI: 10.1039/d2ob01085b] [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
Herein, we report the [4 + 2]-annulation of in situ generated trienamine from 2-(E)-benzylidine-3-pyrrolidinyl acraldehyde with pyrazolone olefins for the first time. It is a robust protocol for the synthesis of biologically appealing functionally rich hexahydrospiroindole pyrazolones which is reflected in excellent yields, stereoselectivity, operational simplicity and broad substrate scope as demonstrated in this paper. Furthermore, we have also explored the synthetic applications of optically pure hexahydrospiroindole pyrazolone to construct biologically important alkylated hexahydrospiroindole pyrazolone and octahydrospiroindole pyrazolone with good yields and high selectivity.
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Affiliation(s)
- Madavi S Prasad
- Asymmetric synthesis and catalysis laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN), Tiruvarur-610 005, India.
| | - Murugesan Sivaprakash
- Asymmetric synthesis and catalysis laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN), Tiruvarur-610 005, India.
| | - A Palanichamy
- Asymmetric synthesis and catalysis laboratory, Department of Chemistry, Central University of Tamil Nadu (CUTN), Tiruvarur-610 005, India.
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7
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Saudan CM, Berrocosa A, Quintaine J, Spoehrle S, Maggi L, Mosimann H, Saudan L. Highly Selective Rhodium Catalyzed 1,4‐Hydrogenation of Conjugated Dienals. ChemCatChem 2022. [DOI: 10.1002/cctc.202200671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | | | | | - Lionel Saudan
- FIRMENICH Research & Development 7 rue de la Bergère 1242 Satigny SWITZERLAND
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8
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Affiliation(s)
- Zhi‐Chao Chen
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University Chengdu 610041 China
| | - Wei Du
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University Chengdu 610041 China
| | - Ying‐Chun Chen
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University Chengdu 610041 China
- College of Pharmacy, Third Military Medical University Shapingba, Chongqing 400038 China
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9
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Xu MH, Yuan YH, Liang DD, Zhang XM, Zhang FM, Tu YQ, Ma AJ, Zhang K, Peng JB. Remote asymmetric conjugate addition catalyzed by a bifunctional spiro-pyrrolidine-derived thiourea catalyst. Org Chem Front 2021. [DOI: 10.1039/d1qo00238d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A novel spiro-pyrrolidine (SPD)-derived bifunctional thiourea catalyst has been developed and used in a stereoselective conjugate addition of furfurals to β,γ-unsaturated α-ketoesters.
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Affiliation(s)
- Ming-Hui Xu
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Yong-Hai Yuan
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Dong-Dong Liang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Xiao-Ming Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
- School of Chemistry & Chemical Engineering
| | - Ai-Jun Ma
- School of Biotechnology and Health Science
- Wuyi University
- Jiangmen 529020
- P. R. China
| | - Kun Zhang
- School of Biotechnology and Health Science
- Wuyi University
- Jiangmen 529020
- P. R. China
| | - Jin-Bao Peng
- School of Biotechnology and Health Science
- Wuyi University
- Jiangmen 529020
- P. R. China
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10
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Zhang M, Gong Y, Zhou W, Zhou Y, Liu XL. Recent advances of chromone-based reactants in the catalytic asymmetric domino annulation reaction. Org Chem Front 2021. [DOI: 10.1039/d1qo00269d] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Chiral polycyclic chromanones are important heterocyclic frameworks that constitute the core structures of many natural products and bioactive molecules.
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Affiliation(s)
- Min Zhang
- National & Local Joint Engineering Research Center for the Exploitation of Homology Resources of Southwest Medicine and Food
- Guizhou University
- Guiyang
- P. R. China
| | - Yi Gong
- National & Local Joint Engineering Research Center for the Exploitation of Homology Resources of Southwest Medicine and Food
- Guizhou University
- Guiyang
- P. R. China
| | - Wei Zhou
- National & Local Joint Engineering Research Center for the Exploitation of Homology Resources of Southwest Medicine and Food
- Guizhou University
- Guiyang
- P. R. China
| | - Ying Zhou
- College of Pharmaceutical Sciences
- Guizhou University of Chinese Medicine
- Guiyang
- P. R. China
| | - Xiong-Li Liu
- National & Local Joint Engineering Research Center for the Exploitation of Homology Resources of Southwest Medicine and Food
- Guizhou University
- Guiyang
- P. R. China
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11
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Lording WJ, Fallon T, Sherburn MS, Paddon-Row MN. The simplest Diels-Alder reactions are not endo-selective. Chem Sci 2020; 11:11915-11926. [PMID: 34123213 PMCID: PMC8162770 DOI: 10.1039/d0sc04553e] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
There is a widespread perception that the high level of endo selectivity witnessed in many Diels-Alder reactions is an intrinsic feature of the transformation. In contrast to expectations based upon this existing belief, the first experimental Diels-Alder reactions of a novel, deuterium-labeled 1,3-butadiene with commonly used mono-substituted alkenic dienophiles (acrolein, methyl vinyl ketone, acrylic acid, methyl acrylate, acrylamide and acrylonitrile) reveal kinetic endo : exo ratios close to 1 : 1. Maleonitrile, butenolide, α-methylene γ-butyrolactone, and N-methylmaleimide behave differently, as does methyl vinyl ketone under Lewis acid catalysis. CBS-QB3 calculations incorporating solvent and temperature parameters give endo : exo product ratios that are in near quantitative agreement with these and earlier experimental findings. This work challenges the preconception of innate endo-selectivity by providing the first experimental evidence that the simplest Diels-Alder reactions are not endo-selective. Trends in behaviour are traced to steric and electronic effects in Diels-Alder transition structures, giving new insights into these fundamental processes.
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Affiliation(s)
- William J Lording
- Research School of Chemistry, Australian National University Canberra ACT 2601 Australia
| | - Thomas Fallon
- Research School of Chemistry, Australian National University Canberra ACT 2601 Australia
| | - Michael S Sherburn
- Research School of Chemistry, Australian National University Canberra ACT 2601 Australia
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12
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Pawar TJ, Mitkari SB, Peña‐Cabrera E, Villegas Gómez C, Cruz Cruz D. Polyenals and Polyenones in Aminocatalysis: A Decade Building Complex Frameworks from Simple Blocks. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000570] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tushar Janardan Pawar
- Departamento de Química División de Ciencias Naturales y Exactas Universidad de Guanajuato Noria Alta S/N 36050 Guanajuato Gto México
| | - Suhas Balasaheb Mitkari
- Departamento de Química División de Ciencias Naturales y Exactas Universidad de Guanajuato Noria Alta S/N 36050 Guanajuato Gto México
| | - Eduardo Peña‐Cabrera
- Departamento de Química División de Ciencias Naturales y Exactas Universidad de Guanajuato Noria Alta S/N 36050 Guanajuato Gto México
| | - Clarisa Villegas Gómez
- Departamento de Química División de Ciencias Naturales y Exactas Universidad de Guanajuato Noria Alta S/N 36050 Guanajuato Gto México
| | - David Cruz Cruz
- Departamento de Química División de Ciencias Naturales y Exactas Universidad de Guanajuato Noria Alta S/N 36050 Guanajuato Gto México
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13
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Reid JP, Hu M, Ito S, Huang B, Hong CM, Xiang H, Sigman MS, Toste FD. Strategies for remote enantiocontrol in chiral gold(iii) complexes applied to catalytic enantioselective γ,δ-Diels-Alder reactions. Chem Sci 2020; 11:6450-6456. [PMID: 34094110 PMCID: PMC8152632 DOI: 10.1039/d0sc00497a] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The use of chiral square planar gold(iii) complexes to access enantioenriched products has rarely been applied in asymmetric catalysis. In this context, we report a mechanistic and synthetic investigation into the use of N-heterocyclic (NHC) gold(iii) complexes in γ,δ-Diels–Alder reactions of 2,4-dienals with cyclopentadiene. The optimal catalyst bearing a unique 2-chloro-1-naphthyl substituent allowed efficient synthesis of functionally rich carbocycles in good yields, diastereo- and enantioselectivities. Transition state and multivariate linear regression (MLR) analysis of both catalyst and substrate trends using molecular descriptors derived from designer parameter acquisition platforms, reveals attractive non-covalent interactions (NCIs) to be key selectivity determinates. These analyses demonstrate that a putative π–π interaction between the substrate proximal double bond and the catalyst aromatic group is an essential feature for high enantioselectivity. Chiral square planar gold(iii) complexes are employed as catalysts in asymmetric Diels–Alder reactions. The non-covalent interactions responsible for the enantioselectivity are revealed through multivariate linear regression analysis.![]()
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Affiliation(s)
- Jolene P Reid
- Department of Chemistry, University of Utah 315 South 1400 East Salt Lake City Utah 84112 USA
| | - Mingyou Hu
- Department of Chemistry, University of California Berkeley California 94720 USA
| | - Susumu Ito
- Department of Chemistry, University of California Berkeley California 94720 USA
| | - Banruo Huang
- Department of Chemistry, University of California Berkeley California 94720 USA
| | - Cynthia M Hong
- Department of Chemistry, University of California Berkeley California 94720 USA
| | - Hengye Xiang
- Department of Chemistry, University of California Berkeley California 94720 USA
| | - Matthew S Sigman
- Department of Chemistry, University of Utah 315 South 1400 East Salt Lake City Utah 84112 USA
| | - F Dean Toste
- Department of Chemistry, University of California Berkeley California 94720 USA
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14
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Curti C, Battistini L, Sartori A, Zanardi F. New Developments of the Principle of Vinylogy as Applied to π-Extended Enolate-Type Donor Systems. Chem Rev 2020; 120:2448-2612. [PMID: 32040305 PMCID: PMC7993750 DOI: 10.1021/acs.chemrev.9b00481] [Citation(s) in RCA: 102] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Indexed: 12/19/2022]
Abstract
The principle of vinylogy states that the electronic effects of a functional group in a molecule are possibly transmitted to a distal position through interposed conjugated multiple bonds. As an emblematic case, the nucleophilic character of a π-extended enolate-type chain system may be relayed from the legitimate α-site to the vinylogous γ, ε, ..., ω remote carbon sites along the chain, provided that suitable HOMO-raising strategies are adopted to transform the unsaturated pronucleophilic precursors into the reactive polyenolate species. On the other hand, when "unnatural" carbonyl ipso-sites are activated as nucleophiles (umpolung), vinylogation extends the nucleophilic character to "unnatural" β, δ, ... remote sites. Merging the principle of vinylogy with activation modalities and concepts such as iminium ion/enamine organocatalysis, NHC-organocatalysis, cooperative organo/metal catalysis, bifunctional organocatalysis, dicyanoalkylidene activation, and organocascade reactions represents an impressive step forward for all vinylogous transformations. This review article celebrates this evolutionary progress, by collecting, comparing, and critically describing the achievements made over the nine year period 2010-2018, in the generation of vinylogous enolate-type donor substrates and their use in chemical synthesis.
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Affiliation(s)
| | | | | | - Franca Zanardi
- Dipartimento di Scienze degli
Alimenti e del Farmaco, Università
di Parma, Parco Area delle Scienze 27A, 43124 Parma, Italy
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15
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Olaizola O, Iriarte I, Zanella G, Gómez‐Bengoa E, Ganboa I, Oiarbide M, Palomo C. Brønsted Base Catalyzed One‐Pot Synthesis of Stereodefined Six‐Member Carbocycles Featuring Transient Trienolates and a Key Intramolecular 1,6‐Addition. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908693] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Olatz Olaizola
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Igor Iriarte
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Giovanna Zanella
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Enrique Gómez‐Bengoa
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Iñaki Ganboa
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizabal 3 20018 San Sebastián Spain
| | - 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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16
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Olaizola O, Iriarte I, Zanella G, Gómez‐Bengoa E, Ganboa I, Oiarbide M, Palomo C. Brønsted Base Catalyzed One‐Pot Synthesis of Stereodefined Six‐Member Carbocycles Featuring Transient Trienolates and a Key Intramolecular 1,6‐Addition. Angew Chem Int Ed Engl 2019; 58:14250-14254. [DOI: 10.1002/anie.201908693] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Olatz Olaizola
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Igor Iriarte
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Giovanna Zanella
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Enrique Gómez‐Bengoa
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Iñaki Ganboa
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizabal 3 20018 San Sebastián Spain
| | - 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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17
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Gallardo-Fuentes S, Lezana N, Lühr S, Galdámez A, Vilches-Herrera M. Influence of Non-Covalent Interactions in the Exo- and Regioselectivity of Aza-Diels-Alder Reactions: Experimental and DFT Calculations. J Org Chem 2019; 84:10825-10831. [PMID: 31412204 DOI: 10.1021/acs.joc.9b01390] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A systematic experimental and theoretical study of the intermolecular Aza-Diels-Alder reaction using 5-aminopyrrole as a building block shows that the commonly accepted endo selectivity, ruled by controversial secondary orbital interactions, are overcome by non-covalent interactions affording to the unusual exo adduct. Additionally, the regioselectivity is also influenced for such interactions. The starting materials are easily prepared, and the use of water as the solvent is a great achievement for the development of cleaner synthetic methodologies.
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Affiliation(s)
- Sebastián Gallardo-Fuentes
- Faculty of Sciences, University of Chile , Department of Chemistry , Las Palmeras 3425 , Ñuñoa, Santiago , Chile
| | - Nicolás Lezana
- Faculty of Sciences, University of Chile , Department of Chemistry , Las Palmeras 3425 , Ñuñoa, Santiago , Chile
| | - Susan Lühr
- Faculty of Sciences, University of Chile , Department of Chemistry , Las Palmeras 3425 , Ñuñoa, Santiago , Chile
| | - Antonio Galdámez
- Faculty of Sciences, University of Chile , Department of Chemistry , Las Palmeras 3425 , Ñuñoa, Santiago , Chile
| | - Marcelo Vilches-Herrera
- Faculty of Sciences, University of Chile , Department of Chemistry , Las Palmeras 3425 , Ñuñoa, Santiago , Chile
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18
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Muthusamy S, Kesavan V. Asymmetric Cycloaddition Reactions of Oxindole α-Keto Esters via Cascade Dienamine-Enamine and Trienamine Strategies. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900567] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Subramaniam Muthusamy
- Chemical Biology Laboratory; Department of Biotechnology; Bhupat and Jyothi Mehta School of Biosciences Building; Indian Institute of Technology Madras; -600036 Chennai India
| | - Venkitasamy Kesavan
- Chemical Biology Laboratory; Department of Biotechnology; Bhupat and Jyothi Mehta School of Biosciences Building; Indian Institute of Technology Madras; -600036 Chennai India
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19
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Guerrero-Corella A, Asenjo-Pascual J, Pawar TJ, Díaz-Tendero S, Martín-Sómer A, Gómez CV, Belmonte-Vázquez JL, Ramírez-Ornelas DE, Peña-Cabrera E, Fraile A, Cruz DC, Alemán J. BODIPY as electron withdrawing group for the activation of double bonds in asymmetric cycloaddition reactions. Chem Sci 2019; 10:4346-4351. [PMID: 31057762 PMCID: PMC6472058 DOI: 10.1039/c9sc00959k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 03/13/2019] [Indexed: 11/29/2022] Open
Abstract
In this work we have found that a BODIPY can be used as an electron withdrawing group for the activation of double bonds in asymmetric catalysis. The synthesis of cyclohexyl derivatives containing a BODIPY unit can easily be achieved via trienamine catalysis. This allows a new different asymmetric synthesis of BODIPY derivatives and opens the door to future transformation of this useful fluorophore. In addition, the Quantum Chemistry calculations and mechanistic studies provide insights into the role of BODIPY as an EWG.
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Affiliation(s)
- Andrea Guerrero-Corella
- Organic Chemistry Department, Módulo 1 , Universidad Autónoma de Madrid , Madrid-28049 , Spain . ; http://www.uam.es/jose.aleman
| | - Juan Asenjo-Pascual
- Organic Chemistry Department, Módulo 1 , Universidad Autónoma de Madrid , Madrid-28049 , Spain . ; http://www.uam.es/jose.aleman
| | - Tushar Janardan Pawar
- Chemistry Department , División de Ciencias Naturales y Exactas , Universidad de Guanajuato , Noria Alta S/N , 36050 Guanajuato , Gto , Mexico
| | - Sergio Díaz-Tendero
- Chemistry Department , Universidad Autónoma de Madrid , Madrid-28049 , Spain
- Condensed Matter Physics Center , IFIMAC , Universidad Autónoma de Madrid , 28049 Madrid , Spain
| | - Ana Martín-Sómer
- Chemistry Department , Universidad Autónoma de Madrid , Madrid-28049 , Spain
| | - Clarisa Villegas Gómez
- Chemistry Department , División de Ciencias Naturales y Exactas , Universidad de Guanajuato , Noria Alta S/N , 36050 Guanajuato , Gto , Mexico
| | - José L Belmonte-Vázquez
- Chemistry Department , División de Ciencias Naturales y Exactas , Universidad de Guanajuato , Noria Alta S/N , 36050 Guanajuato , Gto , Mexico
| | - Diana E Ramírez-Ornelas
- Chemistry Department , División de Ciencias Naturales y Exactas , Universidad de Guanajuato , Noria Alta S/N , 36050 Guanajuato , Gto , Mexico
| | - Eduardo Peña-Cabrera
- Chemistry Department , División de Ciencias Naturales y Exactas , Universidad de Guanajuato , Noria Alta S/N , 36050 Guanajuato , Gto , Mexico
| | - Alberto Fraile
- Organic Chemistry Department, Módulo 1 , Universidad Autónoma de Madrid , Madrid-28049 , Spain . ; http://www.uam.es/jose.aleman
- Institute for Advanced Research in Chemical Sciences (IAdChem) , Universidad Autónoma de Madrid , Madrid-28049 , Spain
| | - David Cruz Cruz
- Chemistry Department , División de Ciencias Naturales y Exactas , Universidad de Guanajuato , Noria Alta S/N , 36050 Guanajuato , Gto , Mexico
| | - José Alemán
- Organic Chemistry Department, Módulo 1 , Universidad Autónoma de Madrid , Madrid-28049 , Spain . ; http://www.uam.es/jose.aleman
- Institute for Advanced Research in Chemical Sciences (IAdChem) , Universidad Autónoma de Madrid , Madrid-28049 , Spain
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20
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Inoshita T, Goshi K, Morinaga Y, Umeda Y, Ishikawa H. Enantioselective Construction of Octahydroquinolines via Trienamine-Mediated Diels-Alder Reactions. Org Lett 2019; 21:2903-2907. [PMID: 30950281 DOI: 10.1021/acs.orglett.9b00932] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A trienamine-mediated asymmetric Diels-Alder reaction using a 5-nitro-2,3-dihydro-4-pyridone derivative as a dienophile in the presence of a secondary amine organocatalyst derived from cis-hydroxyproline was discovered. The reaction provides optically active octahydroquinolines through an endo-selective [4 + 2] cyclization pathway. The following stereoselective denitration, isomerization, and/or hydrogenation generated divergent stereoisomers of decahydroquinolines, which are useful synthons for the total synthesis of Lycopodium alkaloids.
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Affiliation(s)
- Taichi Inoshita
- Department of Chemistry, Graduate School of Science and Technology , Kumamoto University , 2-39-1, Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Kei Goshi
- Department of Chemistry, Graduate School of Science and Technology , Kumamoto University , 2-39-1, Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Yuka Morinaga
- Department of Chemistry, Graduate School of Science and Technology , Kumamoto University , 2-39-1, Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Yuhei Umeda
- Department of Chemistry, Graduate School of Science and Technology , Kumamoto University , 2-39-1, Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Hayato Ishikawa
- Department of Chemistry, Graduate School of Science and Technology , Kumamoto University , 2-39-1, Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan.,Faculty of Advanced Science and Technology , Kumamoto University , 2-39-1, Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
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21
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Cabrera-Trujillo JJ, Fernández I. Understanding exo-selective Diels-Alder reactions involving Fischer-type carbene complexes. Org Biomol Chem 2019; 17:2985-2991. [PMID: 30810152 DOI: 10.1039/c9ob00132h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The factors controlling the selectivity of the Diels-Alder cycloaddition reactions involving Fischer-type carbene complexes and cyclopentadiene have been explored computationally by means of density functional theory calculations. To this end, the influence of the substituents directly attached to the carbene ligand on the endo : exo ratio has been compared to the available experimental data and quantitatively analysed in detail by means of the combination of the activation strain model of reactivity and energy decomposition analysis methods. The insight gained in this computational study may be important for the rational design of exo-selective Diels-Alder reactions.
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Affiliation(s)
- Jorge Juan Cabrera-Trujillo
- Departamento de Química Orgánica I and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040-Madrid, Spain.
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22
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Jiang B, Liang QJ, Han Y, Zhao M, Xu YH, Loh TP. Copper-Catalyzed Dehydrogenative Diels-Alder Reaction. Org Lett 2018; 20:3215-3219. [PMID: 29790760 DOI: 10.1021/acs.orglett.8b01067] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A practical and effective copper-catalyzed dehydrogenative Diels-Alder reaction of gem-diesters and ketone with dienes has been established. The active dienophiles were generated in situ via a radical-based dehydrogenation process, which reacted with a wide variety of dienes to afford various polysubstituted cyclohexene derivatives in good to excellent yields.
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Affiliation(s)
- Bing Jiang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry , University of Science and Technology of China , Hefei 230026 , China
| | - Qiu-Ju Liang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry , University of Science and Technology of China , Hefei 230026 , China
| | - Yu Han
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry , University of Science and Technology of China , Hefei 230026 , China
| | - Meng Zhao
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry , University of Science and Technology of China , Hefei 230026 , China
| | - Yun-He Xu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry , University of Science and Technology of China , Hefei 230026 , China
| | - Teck-Peng Loh
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry , University of Science and Technology of China , Hefei 230026 , China.,Institute of Advanced Synthesis, Jiangsu National Synergetic Innovation Center for Advanced Materials , Nanjing Tech University , Nanjing 210009 , P. R. China.,Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences , Nanyang Technological University , Singapore 637371
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23
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Kim E, Park S, Chang S. Silylative Reductive Amination of α,β-Unsaturated Aldehydes: A Convenient Synthetic Route to β-Silylated Secondary Amines. Chemistry 2018; 24:5765-5769. [DOI: 10.1002/chem.201800958] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Indexed: 12/23/2022]
Affiliation(s)
- Eunae Kim
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 34141 Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 34141 Republic of Korea
- Korea Research Institute of Chemical Technology (KRICT); Daejeon 34114 Republic of Korea
| | - Sehoon Park
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 34141 Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 34141 Republic of Korea
| | - Sukbok Chang
- Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 34141 Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 34141 Republic of Korea
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24
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Yue JF, Ran GY, Yang XX, Du W, Chen YC. Asymmetric Diels–Alder cycloadditions of benzofulvene-based 2,4-dienals via trienamine activation. Org Chem Front 2018. [DOI: 10.1039/c8qo00653a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A new type of 2,4-dienal featuring a benzofulvene skeleton is utilised in asymmetric Diels–Alder cycloadditions with 3-olefinic oxindoles via trienamine catalysis.
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Affiliation(s)
- Jing-Fei Yue
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
| | - Guang-Yao Ran
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
| | - Xing-Xing Yang
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
| | - Wei Du
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
| | - Ying-Chun Chen
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
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25
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Cheng J, Sun J, Yan J, Yang S, Zheng P, Jin Z, Chi YR. Carbene-Catalyzed Indole 3-Methyl C(sp3)–H Bond Functionalization. J Org Chem 2017; 82:13342-13347. [DOI: 10.1021/acs.joc.7b02436] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jian Cheng
- Laboratory
Breeding Base of Green Pesticide and Agricultural Bioengineering,
Key Laboratory of Green Pesticide and Agricultural Bioengineering,
Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
| | - Jun Sun
- Laboratory
Breeding Base of Green Pesticide and Agricultural Bioengineering,
Key Laboratory of Green Pesticide and Agricultural Bioengineering,
Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
| | - Jiekuan Yan
- Laboratory
Breeding Base of Green Pesticide and Agricultural Bioengineering,
Key Laboratory of Green Pesticide and Agricultural Bioengineering,
Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
| | - Song Yang
- Laboratory
Breeding Base of Green Pesticide and Agricultural Bioengineering,
Key Laboratory of Green Pesticide and Agricultural Bioengineering,
Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
| | - Pengcheng Zheng
- Laboratory
Breeding Base of Green Pesticide and Agricultural Bioengineering,
Key Laboratory of Green Pesticide and Agricultural Bioengineering,
Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
| | - Zhichao Jin
- Laboratory
Breeding Base of Green Pesticide and Agricultural Bioengineering,
Key Laboratory of Green Pesticide and Agricultural Bioengineering,
Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
| | - Yonggui Robin Chi
- Laboratory
Breeding Base of Green Pesticide and Agricultural Bioengineering,
Key Laboratory of Green Pesticide and Agricultural Bioengineering,
Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
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26
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Su YL, Han ZY, Li YH, Gong LZ. Asymmetric Allylation of Furfural Derivatives: Synergistic Effect of Chiral Ligand and Organocatalyst on Stereochemical Control. ACS Catal 2017. [DOI: 10.1021/acscatal.7b02667] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Yong-Liang Su
- Hefei National Laboratory for
Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
- Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China
| | - Zhi-Yong Han
- Hefei National Laboratory for
Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
- Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China
| | - Yu-Hui Li
- Hefei National Laboratory for
Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for
Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
- Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China
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27
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Kutwal MS, Appayee C. Highly Regio- and Enantioselective γ-Alkylation of Linear α,β-Unsaturated Aldehydes. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700645] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Mahesh S. Kutwal
- Discipline of Chemistry; Indian Institute of Technology Gandhinagar; 382355 Palaj, Gandhinagar Gujarat India
| | - Chandrakumar Appayee
- Discipline of Chemistry; Indian Institute of Technology Gandhinagar; 382355 Palaj, Gandhinagar Gujarat India
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28
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Diastereoselective Synthesis of Functionalized Angularly-Fused Tetracyclesviaan Organocatalytic Quadruple Reaction Sequence. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Zhou Z, Wang ZX, Ouyang Q, Xiao W, Du W, Chen YC. Cross-conjugated Trienamine Catalysis with α′-Alkylidene 2-Cyclohexenones: Application in β,γ-Regioselective Aza-Diels-Alder Reaction. Chemistry 2017; 23:2945-2949. [PMID: 28019058 DOI: 10.1002/chem.201605606] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Indexed: 01/18/2023]
Affiliation(s)
- Zhi Zhou
- Department of Medicinal Chemistry; West China School of Pharmacy; Sichuan University; Chengdu 610041 P. R. China
| | - Zhou-Xiang Wang
- Department of Medicinal Chemistry; West China School of Pharmacy; Sichuan University; Chengdu 610041 P. R. China
| | - Qin Ouyang
- College of Pharmacy; Third Military Medical University; Chongqing 400038 P. R. China
| | - Wei Xiao
- Department of Medicinal Chemistry; West China School of Pharmacy; Sichuan University; Chengdu 610041 P. R. China
| | - Wei Du
- Department of Medicinal Chemistry; West China School of Pharmacy; Sichuan University; Chengdu 610041 P. R. China
| | - Ying-Chun Chen
- Department of Medicinal Chemistry; West China School of Pharmacy; Sichuan University; Chengdu 610041 P. R. China
- College of Pharmacy; Third Military Medical University; Chongqing 400038 P. R. China
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30
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Klier L, Tur F, Poulsen PH, Jørgensen KA. Asymmetric cycloaddition reactions catalysed by diarylprolinol silyl ethers. Chem Soc Rev 2017; 46:1080-1102. [DOI: 10.1039/c6cs00713a] [Citation(s) in RCA: 152] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Organocatalysis as a paint palette for asymmetric cycloaddition reactions.
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Affiliation(s)
- Lydia Klier
- Department of Chemistry
- Aarhus University
- DK-8000 Aarhus C
- Denmark
| | - Fernando Tur
- Department of Chemistry
- Aarhus University
- DK-8000 Aarhus C
- Denmark
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31
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Yepes D, Pérez P, Jaque P, Fernández I. Effect of Lewis acid bulkiness on the stereoselectivity of Diels–Alder reactions between acyclic dienes and α,β-enals. Org Chem Front 2017. [DOI: 10.1039/c7qo00154a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The influence of Lewis acid bulkiness on the stereoselectivity of Diels–Alder reactions is analysed computationally in detail.
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Affiliation(s)
- Diana Yepes
- Departamento de Ciencias Químicas
- Facultad de Ciencias Exactas
- Universidad Andres Bello
- Santiago
- Chile
| | - Patricia Pérez
- Departamento de Ciencias Químicas
- Facultad de Ciencias Exactas
- Universidad Andres Bello
- Santiago
- Chile
| | - Pablo Jaque
- Departamento de Ciencias Químicas
- Facultad de Ciencias Exactas
- Universidad Andres Bello
- Santiago
- Chile
| | - Israel Fernández
- Departamento de Química Orgánica I
- Facultad de Ciencias Químicas
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad Complutense de Madrid
- 28040-Madrid
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32
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Donslund BS, Nielsen RP, Mønsted SMN, Jørgensen KA. Benzofulvenes in Trienamine Catalysis: Stereoselective Spiroindene Synthesis. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605079] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Bjarke S. Donslund
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
| | - Rune Pagh Nielsen
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
| | - Sofie M. N. Mønsted
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
| | - Karl Anker Jørgensen
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
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33
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Donslund BS, Nielsen RP, Mønsted SMN, Jørgensen KA. Benzofulvenes in Trienamine Catalysis: Stereoselective Spiroindene Synthesis. Angew Chem Int Ed Engl 2016; 55:11124-8. [DOI: 10.1002/anie.201605079] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Indexed: 01/13/2023]
Affiliation(s)
- Bjarke S. Donslund
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
| | - Rune Pagh Nielsen
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
| | - Sofie M. N. Mønsted
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
| | - Karl Anker Jørgensen
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
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34
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Yuan X, Zhang SJ, Du W, Chen YC. Asymmetric Diels-Alder Cycloadditions of Trifluoromethylated Dienophiles Under Trienamine Catalysis. Chemistry 2016; 22:11048-52. [PMID: 27305465 DOI: 10.1002/chem.201600989] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Xin Yuan
- Key Laboratory of Drug-Targeting; and Drug Delivery System of the Ministry of Education; West China School of Pharmacy; Sichuan University; Chengdu 610041 P. R. China
| | - Shan-Jun Zhang
- Key Laboratory of Drug-Targeting; and Drug Delivery System of the Ministry of Education; West China School of Pharmacy; Sichuan University; Chengdu 610041 P. R. China
| | - Wei Du
- Key Laboratory of Drug-Targeting; and Drug Delivery System of the Ministry of Education; West China School of Pharmacy; Sichuan University; Chengdu 610041 P. R. China
| | - Ying-Chun Chen
- Key Laboratory of Drug-Targeting; and Drug Delivery System of the Ministry of Education; West China School of Pharmacy; Sichuan University; Chengdu 610041 P. R. China
- College of Pharmacy; Third Military Medical University; Chongqing 400038 P. R. China
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35
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Hepburn HB, Dell'Amico L, Melchiorre P. Enantioselective Vinylogous Organocascade Reactions. CHEM REC 2016; 16:1787-806. [PMID: 27256039 DOI: 10.1002/tcr.201600030] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Indexed: 12/25/2022]
Abstract
Cascade reactions are powerful tools for rapidly assembling complex molecular architectures from readily available starting materials in a single synthetic operation. Their marriage with asymmetric organocatalysis has led to the development of novel techniques, which are now recognized as reliable strategies for the one-pot enantioselective synthesis of stereochemically dense molecules. In recent years, even more complex synthetic challenges have been addressed by applying the principle of vinylogy to the realm of organocascade catalysis. The key to the success of vinylogous organocascade reactions is the unique ability of the chiral organocatalyst to transfer reactivity to a distal position without losing control on the stereo-determining events. This approach has greatly expanded the synthetic horizons of the field by providing the possibility of forging multiple stereocenters in remote positions from the catalyst's point of action with high selectivity, while simultaneously constructing multiple new bonds. This article critically describes the developments achieved in the field of enantioselective vinylogous organocascade reactions, charting the ideas, the conceptual advances, and the milestone reactions that have been essential for reaching highly practical levels of synthetic efficiency.
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Affiliation(s)
- Hamish B Hepburn
- ICIQ - Institute of Chemical Research of Catalonia Barcelona Institute of Science and Technology, Avenida Països Catalans 16, 43007, Tarragona (Spain)
| | - Luca Dell'Amico
- ICIQ - Institute of Chemical Research of Catalonia Barcelona Institute of Science and Technology, Avenida Països Catalans 16, 43007, Tarragona (Spain)
| | - Paolo Melchiorre
- ICIQ - Institute of Chemical Research of Catalonia Barcelona Institute of Science and Technology, Avenida Països Catalans 16, 43007, Tarragona (Spain).,ICREA - Catalan Institution for Research and Advanced Studies, Passeig Lluís Companys 23, 08010, Barcelona (Spain)
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36
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Affiliation(s)
- Liang Hong
- School
of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006 China
| | - Wangsheng Sun
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000 China
| | - Dongxu Yang
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000 China
| | - Guofeng Li
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000 China
| | - Rui Wang
- School
of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006 China
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000 China
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37
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Organocatalytic Strategy for the Enantioselective Cycloaddition to Trisubstituted Nitroolefins to Create Spirocyclohexene-Oxetane Scaffolds. Angew Chem Int Ed Engl 2016; 55:2478-82. [DOI: 10.1002/anie.201510731] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 12/09/2015] [Indexed: 11/07/2022]
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38
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Gao L, Han J, Lei X. Enantioselective Total Syntheses of Kuwanon X, Kuwanon Y, and Kuwanol A. Org Lett 2016; 18:360-3. [DOI: 10.1021/acs.orglett.5b03285] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lei Gao
- Graduate
School of Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing 100730, China
- National Institute of Biological Sciences (NIBS), Beijing 102206, China
| | - Jianguang Han
- National Institute of Biological Sciences (NIBS), Beijing 102206, China
| | - Xiaoguang Lei
- Graduate
School of Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing 100730, China
- National Institute of Biological Sciences (NIBS), Beijing 102206, China
- Beijing
National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic
Chemistry and Molecular Engineering of Ministry of Education, Department
of Chemical Biology, College of Chemistry and Molecular Engineering,
Synthetic and Functional Biomolecules Center, and Peking-Tsinghua
Center for Life Sciences, Peking University, Beijing 100871, China
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39
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Monleón A, Glaus F, Vergura S, Jørgensen KA. Organocatalytic Strategy for the Enantioselective Cycloaddition to Trisubstituted Nitroolefins to Create Spirocyclohexene-Oxetane Scaffolds. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510731] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alicia Monleón
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
| | - Florian Glaus
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
| | - Stefania Vergura
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
| | - Karl Anker Jørgensen
- Department of Chemistry; Aarhus University; Langelandsgade 140 8000 Aarhus C Denmark
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40
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Sellstedt M, Schwalfenberg M, Ziegler S, Antonchick AP, Waldmann H. Trienamine catalyzed asymmetric synthesis and biological investigation of a cytochalasin B-inspired compound collection. Org Biomol Chem 2016; 14:50-4. [PMID: 26606903 PMCID: PMC4766597 DOI: 10.1039/c5ob02272j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 11/18/2015] [Indexed: 11/21/2022]
Abstract
Due to their enhanced metabolic needs many cancers need a sufficient supply of glucose, and novel inhibitors of glucose import are in high demand. Cytochalasin B (CB) is a potent natural glucose import inhibitor which also impairs the actin cytoskeleton leading to undesired toxicity. With a view to identifying selective glucose import inhibitors we have developed an enantioselective trienamine catalyzed synthesis of a CB-inspired compound collection. Biological analysis revealed that indeed actin impairment can be distinguished from glucose import inhibition and led to the identification of the first selective glucose import inhibitor based on the basic structural architecture of cytochalasin B.
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Affiliation(s)
- Magnus Sellstedt
- Max-Planck-Institute für Molekulare Physiologie , Otto-Hahn-Strasse 11 , 44227 Dortmund , Germany .
| | - Melanie Schwalfenberg
- Max-Planck-Institute für Molekulare Physiologie , Otto-Hahn-Strasse 11 , 44227 Dortmund , Germany .
| | - Slava Ziegler
- Max-Planck-Institute für Molekulare Physiologie , Otto-Hahn-Strasse 11 , 44227 Dortmund , Germany .
| | - Andrey P. Antonchick
- Max-Planck-Institute für Molekulare Physiologie , Otto-Hahn-Strasse 11 , 44227 Dortmund , Germany .
| | - Herbert Waldmann
- Max-Planck-Institute für Molekulare Physiologie , Otto-Hahn-Strasse 11 , 44227 Dortmund , Germany .
- Technische Universität Dortmund , Otto-Hahn-Strasse 6 , 44221 Dortmund , Germany
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41
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Gu J, Xiao B, Chen Y, Du W, Chen Y. Asymmetric Diels–Alder and Cascade Reaction of Quinone Imine Ketals and 2,4‐Dienals: Construction of Chiral Benzo[
de
]quinolone Derivatives. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500860] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Jing Gu
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China, Fax: (+86)‐28‐8550‐2609
| | - Ben‐Xian Xiao
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China, Fax: (+86)‐28‐8550‐2609
| | - Yu‐Rong Chen
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China, Fax: (+86)‐28‐8550‐2609
| | - Wei Du
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China, Fax: (+86)‐28‐8550‐2609
| | - Ying‐Chun Chen
- Key Laboratory of Drug‐Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China, Fax: (+86)‐28‐8550‐2609
- College of Pharmacy, Third Military Medical University, Chongqing 400038, People's Republic of China
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Abstract
The Diels–Alder reaction is one of the most powerful, well-established, and versatile reactions in organic chemistry; however, its application in certain settings remains a challenge as a result of functional group incompatibility. In this review, we examine the methods in which masked ketenes can be employed as dienophiles, taking particular note of applications in complex settings.
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Chintalapudi V, Galvin EA, Greenaway RL, Anderson EA. Combining cycloisomerization with trienamine catalysis: a regiochemically flexible enantio- and diastereoselective synthesis of hexahydroindoles. Chem Commun (Camb) 2016; 52:693-6. [DOI: 10.1039/c5cc08886k] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of polysubstituted hexahydroindoles through trienamine-organocatalyzed cycloadditions of pyrrolidinyl dienals, prepared by palladium-catalyzed cycloisomerization, is reported.
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44
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Zhou JH, Jiang B, Meng FF, Xu YH, Loh TP. B(C6F5)3: A New Class of Strong and Bulky Lewis Acid for Exo-Selective Intermolecular Diels–Alder Reactions of Unreactive Acyclic Dienes with α,β-Enals. Org Lett 2015; 17:4432-5. [DOI: 10.1021/acs.orglett.5b02066] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jia-Hui Zhou
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Bing Jiang
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Fei-Fan Meng
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Yun-He Xu
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Teck-Peng Loh
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Division
of Chemistry and Biological Chemistry, School of Physical and Mathematical
Sciences, Nanyang Technological University, Singapore 637371
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45
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Kotha S, Chavan AS, Goyal D. Diversity-Oriented Approaches to Polycyclics and Bioinspired Molecules via the Diels-Alder Strategy: Green Chemistry, Synthetic Economy, and Beyond. ACS COMBINATORIAL SCIENCE 2015; 17:253-302. [PMID: 25875156 DOI: 10.1021/co500146u] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We describe diverse approaches to various dienes and their utilization in the Diels-Alder reaction to produce a variety of polycycles. The dienes covered here are prepared by simple alkylation reaction or via the Claisen rearrangement or by enyne metathesis of alkyne or enyne building blocks. Here, we have also included the Diels-Alder chemistry of dendralenes, a higher analog of cross-conjugated dienes. The present article is inclusive of o-xylylene derivatives that are generated in situ starting with benzosultine or benzosulfone derivatives. The Diels-Alder reaction of these dienes with various dienophiles gave diverse polycyclic systems and biologically important targets.
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076 India
| | - Arjun S. Chavan
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076 India
| | - Deepti Goyal
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076 India
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46
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47
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Kumar I, Ramaraju P, Mir NA, Singh A. Linear dialdehydes as promising substrates for aminocatalyzed transformations. Org Biomol Chem 2015; 13:1280-93. [DOI: 10.1039/c4ob01805b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Linear dialdehydes: This article summarizes the recent utilization of linear dialdehydes as appropriate substrates for amine catalyzed cascade/domino transformations.
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Affiliation(s)
- Indresh Kumar
- Department of Chemistry
- Birla Institute of Technology and Science-Pilani
- India
| | - Panduga Ramaraju
- Department of Chemistry
- Birla Institute of Technology and Science-Pilani
- India
| | - Nisar A. Mir
- Department of Chemistry
- Birla Institute of Technology and Science-Pilani
- India
| | - Anoop Singh
- Department of Chemistry
- Birla Institute of Technology and Science-Pilani
- India
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48
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Li Y, López-Delgado FJ, Jørgensen DKB, Nielsen RP, Jiang H, Jørgensen KA. Trienamine-mediated asymmetric [4+2]-cycloaddition of α,β-unsaturated ester surrogates applying 4-nitro-5-styrylisoxazoles. Chem Commun (Camb) 2014; 50:15689-91. [DOI: 10.1039/c4cc08171d] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Blanco V, Leigh DA, Lewandowska U, Lewandowski B, Marcos V. Exploring the Activation Modes of a Rotaxane-Based Switchable Organocatalyst. J Am Chem Soc 2014; 136:15775-80. [DOI: 10.1021/ja509236u] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Victor Blanco
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL, United Kingdom
| | - David A. Leigh
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL, United Kingdom
| | - Urszula Lewandowska
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL, United Kingdom
| | - Bartosz Lewandowski
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL, United Kingdom
| | - Vanesa Marcos
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL, United Kingdom
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50
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Cruz Cruz D, Mose R, Villegas Gómez C, Torbensen SV, Larsen MS, Jørgensen KA. Organocatalytic Cascade Reactions: Towards the Diversification of Hydroisochromenes and Chromenes through Two Different Activation Modes. Chemistry 2014; 20:11331-5. [DOI: 10.1002/chem.201403505] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Indexed: 11/11/2022]
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