1
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Renningholtz T, Lim ERX, James MJ, Trujillo C. Computational methods for investigating organic radical species. Org Biomol Chem 2024. [PMID: 39012651 DOI: 10.1039/d4ob00532e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/17/2024]
Abstract
Computational analysis of organic radical species presents significant challenges. This study compares the efficacy of various DFT and wavefunction methods in predicting radical stabilisation energies, bond dissociation energies, and redox potentials for organic radicals. The hybrid meta-GGA M062X-D3(0), and the range-separated hybrids ωB97M-V and ωB97M-D3(BJ) emerged as the most reliable functionals, consistently providing accurate predictions across different basis sets including 6-311G**, cc-pVTZ, and def2-TZVP.
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Affiliation(s)
- Tim Renningholtz
- The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - Ethan R X Lim
- The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - Michael J James
- The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - Cristina Trujillo
- The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
- TBSI - School of Chemistry, The University of Dublin, Trinity College, D02 R590 Dublin 2, Ireland
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2
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Ji DS, Zhang R, Han XY, Hu XQ, Xu PF. Stereodivergent Synthesis of All Stereoisomers of 2,3-Disubstituted δ-Lactam Derivatives via Organocatalytic Cascade Reactions and Base-Induced Epimerization. Org Lett 2024; 26:315-320. [PMID: 38175121 DOI: 10.1021/acs.orglett.3c03861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
A protocol was developed to achieve stereodivergent synthesis of stereoisomers of δ-lactam bearing vicinal chiral centers. Organocatalytic cascade reactions were employed to produce the target products as the kinetic products, which exhibited remarkable enantioselectivities. In the presence of DBU, the kinetic product underwent epimerization to form a thermodynamically more stable diastereomer without loss in enantioselectivity. By simply switching the chiral organocatalyst and its enantiomer, we can efficiently obtain four stereoisomers with high enantioselectivities.
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Affiliation(s)
- Dong-Sheng Ji
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Gansu 730000, P. R. China
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, P. R. China
| | - Rui Zhang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Gansu 730000, P. R. China
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, P. R. China
| | - Xu-Yan Han
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Gansu 730000, P. R. China
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, P. R. China
| | - Xiu-Qin Hu
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, P. R. China
| | - Peng-Fei Xu
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Gansu 730000, P. R. China
- MOE Frontiers Science Center for Rare Isotopes, Lanzhou University, Gansu 730000, P. R. China
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, P. R. China
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3
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Ramiro JL, Martínez-Caballero S, Neo AG, Díaz J, Marcos CF. The Castagnoli–Cushman Reaction. Molecules 2023; 28:molecules28062654. [PMID: 36985626 PMCID: PMC10058692 DOI: 10.3390/molecules28062654] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 03/11/2023] [Accepted: 03/12/2023] [Indexed: 03/17/2023] Open
Abstract
Since the first reports of the reaction of imines and cyclic anhydrides by Castagnoli and Cushman, this procedure has been applied to the synthesis of a variety of lactams, some of them with important synthetic or biological interest. The scope of the reaction has been extended to the use of various Schiff bases and anhydrides as well as to different types of precursors for these reagents. In recent years, important advances have been made in understanding the mechanism of the reaction, which has historically been quite controversial. This has helped to develop reaction conditions that lead to pure diastereomers and even homochiral products. In addition, these mechanistic studies have also led to the development of new multicomponent versions of the Castagnoli–Cushman reaction that allow products with more diverse and complex molecular structures to be easily obtained.
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Affiliation(s)
- José Luis Ramiro
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain
| | - Sonia Martínez-Caballero
- Departamento de Didáctica de las Ciencias Experimentales y las Matemáticas, Facultad de Formación de Profesorado, Universidad de Extremadura, 10003 Cáceres, Spain
| | - Ana G. Neo
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain
- Correspondence: (A.G.N.); (C.F.M.)
| | - Jesús Díaz
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain
| | - Carlos F. Marcos
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain
- Correspondence: (A.G.N.); (C.F.M.)
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4
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The Use of Aryl-Substituted Homophthalic Anhydrides in the Castagnoli-Cushman Reaction Provides Access to Novel Tetrahydroisoquinolone Carboxylic Acid Bearing an All-Carbon Quaternary Stereogenic Center. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27238462. [PMID: 36500582 PMCID: PMC9738897 DOI: 10.3390/molecules27238462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 11/28/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
Novel aryl-substituted homophthalic acids were cyclodehydrated to the respective homophthalic anhydrides for use in the Castagnoli-Cushman reaction. With a range of imines, this reaction proceeded smoothly and delivered hitherto undescribed 4-aryl-substituted tetrahydroisoquinolonic acids with remarkable diastereoselectivity, good yields and no need for chromatographic purification. These findings significantly extend the range of cyclic anhydrides employable in the Castagnoli-Cushman reaction and signify access to a novel substitution pattern around the medicinally relevant tetrahydroisoquinolonic acid scaffold.
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5
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Hang QQ, Wu SF, Yang S, Wang X, Zhong Z, Zhang YC, Shi F. Design and catalytic atroposelective synthesis of axially chiral isochromenone-indoles. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1363-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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6
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Entgelmeier LM, García Mancheño O. Activation Modes in Asymmetric Anion-Binding Catalysis. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1846-6139] [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
Over the past two decades, enantioselective anion-binding catalysis has emerged as a powerful strategy for the induction of chirality in organic transformations. The stereoselectivity is achieved in a range of different reactions by using non-covalent interactions between a chiral catalyst and an ionic substrate or intermediate, and subsequent formation of a chiral contact ion-pair upon anion-binding. This strategy offers vast possibilities in catalysis and the constant development of new reactions has led to various substrate activation approaches. This review provides an overview on the different activation modes in asymmetric anion-binding catalysis by looking at representative examples and recent advances made in this field.
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7
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Liu S, Chen Z, Chen J, Ni S, Zhang Y, Shi F. Rational Design of Axially Chiral Styrene‐Based Organocatalysts and Their Application in Catalytic Asymmetric (2+4) Cyclizations. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202112226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Si‐Jia Liu
- School of Chemistry and Materials Science Key Laboratory of Green Synthetic Chemistry for Functional Materials of Jiangsu Province Jiangsu Normal University Xuzhou 221116 China
| | - Zhi‐Han Chen
- School of Chemistry and Materials Science Key Laboratory of Green Synthetic Chemistry for Functional Materials of Jiangsu Province Jiangsu Normal University Xuzhou 221116 China
| | - Jia‐Yi Chen
- Department of Chemistry Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province Shantou University Shantou 515063 China
| | - Shao‐Fei Ni
- Department of Chemistry Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province Shantou University Shantou 515063 China
| | - Yu‐Chen Zhang
- School of Chemistry and Materials Science Key Laboratory of Green Synthetic Chemistry for Functional Materials of Jiangsu Province Jiangsu Normal University Xuzhou 221116 China
| | - Feng Shi
- School of Chemistry and Materials Science Key Laboratory of Green Synthetic Chemistry for Functional Materials of Jiangsu Province Jiangsu Normal University Xuzhou 221116 China
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8
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Trifluoroethanol Promoted Castagnoli-Cushman Cycloadditions of Imines with Homophthalic Anhydride. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27030844. [PMID: 35164109 PMCID: PMC8839191 DOI: 10.3390/molecules27030844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 01/24/2022] [Accepted: 01/25/2022] [Indexed: 11/17/2022]
Abstract
Lactams are essential compounds in medicinal chemistry and key intermediates in the synthesis of natural products. The Castagnoli–Cushman reaction (CCR) of homophthalic anhydride with imines is an exciting method for accessing cyclic densely substituted lactam products. Most CCRs need to be catalyzed or heated. Herein, we report a new, efficient, metal and catalyst-free CCR for the synthesis of poly-substituted 3,4-lactams utilizing the unique properties of trifluoroethanol (TFE). This procedure provides high-speed and smooth access to a broad range of densely substituted 3,4-lactams in good yields and a 100% atom-economical fashion.
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9
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Niu R, He Y, Lin JB. Catalytic asymmetric synthesis of α-stereogenic carboxylic acids: recent advances. Org Biomol Chem 2021; 20:37-54. [PMID: 34854454 DOI: 10.1039/d1ob02038b] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Chiral carboxylic acids bearing an α-stereogenic center constitute the backbone of many natural products and therapeutic reagents as well as privileged chiral ligands and catalysts. Hence, it is not surprising that a large number of elegant catalytic asymmetric strategies have been developed toward the efficient synthesis of α-chiral carboxylic acids, such as α-hydroxy acids and α-amino acids. In this review, the recent advances in asymmetric synthesis of α-stereogenic free carboxylic acids via organocatalysis and transition metal catalysis are summarized (mainly from 2010 to 2020). The content is organized by the reaction type of the carboxyl source involved, including asymmetric functionalization of substituted carboxylic acids, cyclic anhydrides, α-keto acids, substituted α,β-unsaturated acids and so on. We hope that this review will motivate further interest in catalytic asymmetric synthesis of chiral α-substituted carboxylic acids.
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Affiliation(s)
- Rui Niu
- Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an 716000, China.
| | - Yi He
- Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an 716000, China.
| | - Jun-Bing Lin
- Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an 716000, China.
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10
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Liu SJ, Chen ZH, Chen JY, Ni SF, Zhang YC, Shi F. Rational Design of Axially Chiral Styrene-Based Organocatalysts and Their Application in Catalytic Asymmetric (2+4) Cyclizations. Angew Chem Int Ed Engl 2021; 61:e202112226. [PMID: 34846087 DOI: 10.1002/anie.202112226] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Indexed: 12/13/2022]
Abstract
A new class of axially chiral styrene-based thiourea tertiary amine catalysts, which have unique characteristics such as an efficient synthetic route, multiple chiral elements, and multiple activating groups, has been rationally designed. These new chiral catalysts have proven to be efficient organocatalysts, enabling the chemo-, diastereo-, and enantioselective (2+4) cyclization of 2-benzothiazolimines with homophthalic anhydrides in good yields (up to 96 %) with excellent stereoselectivities (all >95:5 dr, up to 98 % ee). More importantly, theoretical calculations elucidated the important role of an axially chiral styrene moiety in controlling both the reactivity and enantioselectivity. This work not only represents the first design of styrene-based chiral thiourea tertiary amine catalysts and the first catalytic asymmetric (2+4) cyclization of 2-benzothiazolimines, but also gives an in-depth understanding of axially chiral styrene-based organocatalysts.
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Affiliation(s)
- Si-Jia Liu
- School of Chemistry and Materials Science, Key Laboratory of Green Synthetic Chemistry for Functional Materials of Jiangsu Province, Jiangsu Normal University, Xuzhou, 221116, China
| | - Zhi-Han Chen
- School of Chemistry and Materials Science, Key Laboratory of Green Synthetic Chemistry for Functional Materials of Jiangsu Province, Jiangsu Normal University, Xuzhou, 221116, China
| | - Jia-Yi Chen
- Department of Chemistry, Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, 515063, China
| | - Shao-Fei Ni
- Department of Chemistry, Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, 515063, China
| | - Yu-Chen Zhang
- School of Chemistry and Materials Science, Key Laboratory of Green Synthetic Chemistry for Functional Materials of Jiangsu Province, Jiangsu Normal University, Xuzhou, 221116, China
| | - Feng Shi
- School of Chemistry and Materials Science, Key Laboratory of Green Synthetic Chemistry for Functional Materials of Jiangsu Province, Jiangsu Normal University, Xuzhou, 221116, China
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11
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Chan YC, Sak MH, Frank SA, Miller SJ. Tunable and Cooperative Catalysis for Enantioselective Pictet-Spengler Reaction with Varied Nitrogen-Containing Heterocyclic Carboxaldehydes. Angew Chem Int Ed Engl 2021; 60:24573-24581. [PMID: 34487418 PMCID: PMC8556314 DOI: 10.1002/anie.202109694] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/24/2021] [Indexed: 01/16/2023]
Abstract
Herein we report an organocatalytic enantioselective functionalization of heterocyclic carboxaldehydes via the Pictet-Spengler reaction. Through careful pairing of novel squaramide and Brønsted acid catalysts, our method tolerates a breadth of heterocycles, enabling preparation of a series of heterocycle conjugated β-(tetrahydro)carbolines in good yield and enantioselectivity. Careful selection of carboxylic acid co-catalyst is essential for toleration of a variety of regioisomeric heterocycles. Utility is demonstrated via the three-step stereoselective preparation of pyridine-containing analogues of potent selective estrogen receptor downregulator and U.S. FDA approved drug Tadalafil.
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Affiliation(s)
- Yuk-Cheung Chan
- Department of Chemistry, Yale University, New Haven, CT, 06520, USA
| | - Marcus H Sak
- Department of Chemistry, Yale University, New Haven, CT, 06520, USA
| | - Scott A Frank
- Synthetic Molecule Design and Development, Eli Lilly and Company, Indianapolis, IN, 46285, USA
| | - Scott J Miller
- Department of Chemistry, Yale University, New Haven, CT, 06520, USA
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12
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Chan Y, Sak MH, Frank SA, Miller SJ. Tunable and Cooperative Catalysis for Enantioselective Pictet‐Spengler Reaction with Varied Nitrogen‐Containing Heterocyclic Carboxaldehydes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109694] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Yuk‐Cheung Chan
- Department of Chemistry Yale University New Haven CT 06520 USA
| | - Marcus H. Sak
- Department of Chemistry Yale University New Haven CT 06520 USA
| | - Scott A. Frank
- Synthetic Molecule Design and Development Eli Lilly and Company Indianapolis IN 46285 USA
| | - Scott J. Miller
- Department of Chemistry Yale University New Haven CT 06520 USA
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13
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Moschona F, Vagena A, Vidali VP, Rassias G. A Novel Dual Organocatalyst for the Asymmetric Pinder Reaction and a Mechanistic Proposal Consistent with the Isoinversion Effect Thereof. Molecules 2021; 26:6398. [PMID: 34770807 PMCID: PMC8588278 DOI: 10.3390/molecules26216398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 10/19/2021] [Accepted: 10/20/2021] [Indexed: 11/26/2022] Open
Abstract
In general, the Pinder reaction concerns the reaction between an enolisable anhydride and an aldehyde proceeding initially through a Knoevenagel reaction followed by the ring closing process generating lactones with at least two chiral centers. These scaffolds are frequently present in natural products and synthetic bioactive molecules, hence it has attracted intense interest in organic synthesis and medicinal chemistry, particularly with respect to controlling the diastereo- and enantioselectivity. To the best of our knowledge, there has been only one attempt prior to this work towards the development of a catalytic enantioselective Pinder reaction. In our approach, we designed, synthesized, and tested dual chiral organocatalysts by combining BIMAH amines, (2-(α-(alkyl)methanamine)-1H-benzimidazoles, and a Lewis acid motif, such as squaramides, ureas and thioureas. The optimum catalyst was the derivative of isopropyl BIMAH bearing a bis(3,5-trifluoromethyl) thiourea, which afforded the Pinder products from various aromatic aldehydes with diastereomeric ratio >98:2 and enatioselectivity up to 92 ee%. Interestingly, the enantioselectivity of this catalyzed process is increased at higher concentrations and exhibits an isoinversion effect, namely an inverted "U" shaped dependency with respect to the temperature. Mechanistically, these features, point to a transition state involving an entropy-favored heterodimer interaction between a catalyst/anhydride and a catalyst/aldehyde complex when all other processes leading to this are much faster in comparison above the isoinversion temperature.
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Affiliation(s)
- Fotini Moschona
- Department of Chemistry, University of Patras, 26504 Patra, Greece; (F.M.); (A.V.)
| | - Athena Vagena
- Department of Chemistry, University of Patras, 26504 Patra, Greece; (F.M.); (A.V.)
| | - Veroniki P. Vidali
- NCSR “Demokritos”, Institute of Nanoscience and Nanotechnology, Patr. Grigoriou and Neapoleos 27, 153 41 Athens, Greece;
| | - Gerasimos Rassias
- Department of Chemistry, University of Patras, 26504 Patra, Greece; (F.M.); (A.V.)
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14
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Howard SY, Di Maso MJ, Shimabukuro K, Burlow NP, Tan DQ, Fettinger JC, Malig TC, Hein JE, Shaw JT. Mechanistic Investigation of Castagnoli-Cushman Multicomponent Reactions Leading to a Three-Component Synthesis of Dihydroisoquinolones. J Org Chem 2021; 86:11599-11607. [PMID: 34351161 DOI: 10.1021/acs.joc.1c01163] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The mechanisms for the three- and four-component variants of the Castagnoli-Cushman reaction (CCR) have been investigated. A series of crossover experiments were conducted to probe the structure and reactivity of known amide-acid intermediates for the three- and four-component variants of the CCR (3CR and 4CR, respectively). Control experiments paired with in situ reaction monitoring with infrared spectroscopy for the 4CR align with a mechanism in which amide-acids derived from maleic anhydride can reversibly form free amine and cyclic anhydride. Although this equilibrium is unfavorable, the aldehyde present can trap the primary amine through imine formation and react with the enol form of the anhydride through a Mannich-like mechanism. This detailed mechanistic investigation coupled with additional crossover experiments supports an analogous mechanism for the 3CR and has led to the elucidation of new 3CR conditions with homophthalic anhydride, amines, and aldehydes for the formation of dihydroisoquinolones in good yields and excellent diastereoselectivity. This work represents the culmination of more than a decade of mechanistic speculation for the 3- and 4CR, enabling the design of new multicomponent reactions that exploit this novel mechanism.
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Affiliation(s)
- Sara Y Howard
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Michael J Di Maso
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Kristin Shimabukuro
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Noah P Burlow
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Darlene Q Tan
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - James C Fettinger
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Thomas C Malig
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
| | - Jason E Hein
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
| | - Jared T Shaw
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
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15
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Guranova N, Golubev P, Bakulina O, Dar'in D, Kantin G, Krasavin M. Unexpected formal [4 + 2]-cycloaddition of chalcone imines and homophthalic anhydrides: preparation of dihydropyridin-2(1 H)-ones. Org Biomol Chem 2021; 19:3829-3833. [PMID: 33949583 DOI: 10.1039/d1ob00534k] [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 series of medicinally important dihydropyridin-2(1H)-ones have been prepared via a novel [4 + 2]-formal cycloaddition reaction of chalcone imines and homophthalic anhydrides, which is a rare example of lactam construction from an imine acting as a four-atom building block. In contrast to previous studies on the reactivity of homophthalic anhydrides towards similar substrates, N-tosyl chalcone imines, we found the possibility of switching chemoselectivity by changing substituents at the nitrogen atom, which leads to the formation of heterocycles instead of the expected carbocycles. This reaction is very similar in appearance to the classic 1,2-addition of cyclic anhydrides to imines, often referred to as the Castagnoli-Cushman reaction, but differs in mechanistic details (representing a 1,4-reaction of imine). The developed atom-economical, stereoselective and catalyst- and chromatography-free protocol provided facile access to 28 structurally diverse heterocyclic products (in up to 88% yield) including synthetically challenging annelated tricyclic and previously unreported pentaaryl-substituted dihydropyridin-2(1H)-ones.
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Affiliation(s)
- Natalia Guranova
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation.
| | - Pavel Golubev
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation.
| | - Olga Bakulina
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation.
| | - Dmitry Dar'in
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation.
| | - Grigory Kantin
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation.
| | - Mikhail Krasavin
- Saint Petersburg State University, Saint Petersburg, 199034 Russian Federation.
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16
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Non-Covalent Interactions in Enantioselective Organocatalysis: Theoretical and Mechanistic Studies of Reactions Mediated by Dual H-Bond Donors, Bifunctional Squaramides, Thioureas and Related Catalysts. Catalysts 2021. [DOI: 10.3390/catal11050569] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Chiral bifunctional dual H-bond donor catalysts have become one of the pillars of organocatalysis. They include squaramide, thiosquaramide, thiourea, urea, and even selenourea-based catalysts combined with chiral amines, cinchona alkaloids, sulfides, phosphines and more. They can promote several types of reactions affording products in very high yields and excellent stereoselectivities in many cases: conjugate additions, cycloadditions, the aldol and Henry reactions, the Morita–Baylis–Hilman reaction, even cascade reactions, among others. The desire to understand mechanisms and the quest for the origins of stereoselectivity, in attempts to find guidelines for developing more efficient catalysts for new transformations, has promoted many mechanistic and theoretical studies. In this review, we survey the literature published in this area since 2015.
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17
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Takagi R, Sakai Y, Duong DT. Bis(trifluoromethanesulfonimide) (BSI): Acidity and application to hydrofunctionalization as a Brønsted acid catalyst. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132037] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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18
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Ibba F, Pupo G, Thompson AL, Brown JM, Claridge TDW, Gouverneur V. Impact of Multiple Hydrogen Bonds with Fluoride on Catalysis: Insight from NMR Spectroscopy. J Am Chem Soc 2020; 142:19731-19744. [PMID: 33166450 PMCID: PMC7677927 DOI: 10.1021/jacs.0c09832] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
![]()
Hydrogen-bonding
interactions have been explored in catalysis,
enabling complex chemical reactions. Recently, enantioselective nucleophilic
fluorination with metal alkali fluoride has been accomplished with
BINAM-derived bisurea catalysts, presenting up to four NH hydrogen-bond
donors (HBDs) for fluoride. These catalysts bring insoluble CsF and
KF into solution, control fluoride nucleophilicity, and provide a
chiral microenvironment for enantioselective fluoride delivery to
the electrophile. These attributes encouraged a 1H/19F NMR study to gain information on hydrogen-bonding networks
with fluoride in solution, as well as how these arrangements impact
the efficiency of catalytic nucleophilic fluorination. Herein, NMR
experiments enabled the determination of the number and magnitude
of HB contacts to fluoride for thirteen bisurea catalysts. These data
supplemented by diagnostic coupling constants 1hJNH···F– give
insight into how multiple H bonds to fluoride influence reaction performance.
In dichloromethane (DCM-d2), nonalkylated
BINAM-derived bisurea catalyst engages two of its four NH groups in
hydrogen bonding with fluoride, an arrangement that allows effective
phase-transfer capability but low control over enantioselectivity
for fluoride delivery. The more efficient N-alkylated BINAM-derived
bisurea catalysts undergo urea isomerization upon fluoride binding
and form dynamically rigid trifurcated hydrogen-bonded fluoride complexes
that are structurally similar to their conformation in the solid state.
Insight into how the countercation influences fluoride complexation
is provided based on NMR data characterizing the species formed in
DCM-d2 when reacting a bisurea catalyst
with tetra-n-butylammonium fluoride (TBAF) or CsF.
Structure–activity analysis reveals that the three hydrogen-bond
contacts with fluoride are not equal in terms of their contribution
to catalyst efficacy, suggesting that tuning individual electronic
environment is a viable approach to control phase-transfer ability
and enantioselectivity.
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Affiliation(s)
- Francesco Ibba
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Gabriele Pupo
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Amber L Thompson
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - John M Brown
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Timothy D W Claridge
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Véronique Gouverneur
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
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19
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Bayoud B, Barama L, Nacereddine AK, Djerourou A. Shedding light on the factors controlling the mechanism, selectivity and reactivity of the Diels–Alder reactions between substituted pyridinones and ethylenes: a MEDT study. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1828635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Brahim Bayoud
- Synthesis and Organic Biocatalysis Laboratory, Chemistry Department, Faculty of Sciences, Badji Mokhtar-Annaba University, Annaba, Algeria
| | - Leila Barama
- Synthesis and Organic Biocatalysis Laboratory, Chemistry Department, Faculty of Sciences, Badji Mokhtar-Annaba University, Annaba, Algeria
| | - Abdelmalek Khorief Nacereddine
- Laboratory of Physical Chemistry and Biology of Materials, Department of Physics and Chemistry, Higher Normal School of Technological Education-Skikda, Skikda, Algeria
| | - Abdelhafid Djerourou
- Synthesis and Organic Biocatalysis Laboratory, Chemistry Department, Faculty of Sciences, Badji Mokhtar-Annaba University, Annaba, Algeria
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20
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Karjee P, Sarkar T, Kar S, Punniyamurthy T. Transition-Metal-Free Stereospecific Oxidative Annulative Coupling of Indolines with Aziridines. J Org Chem 2020; 85:8261-8270. [PMID: 32468818 DOI: 10.1021/acs.joc.0c00899] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Tandem C-N bond formation for the oxidative annulation of indolines with aziridines is accomplished employing the combination of DDQ and NaOCl at ambient conditions. Optically active aziridine can be coupled with high enantiomeric purity (>99% ee). The substrate scope, stereocontrol with the enantioenriched substrate, and scale-up are the important practical advantages.
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Affiliation(s)
- Pallab Karjee
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Tanumay Sarkar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Subhradeep Kar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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21
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Strassfeld DA, Wickens ZK, Picazo E, Jacobsen EN. Highly Enantioselective, Hydrogen-Bond-Donor Catalyzed Additions to Oxetanes. J Am Chem Soc 2020; 142:9175-9180. [PMID: 32364378 PMCID: PMC7293824 DOI: 10.1021/jacs.0c03991] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A precisely designed chiral squaramide derivative is shown to promote the highly enantioselective addition of trimethylsilyl bromide (TMSBr) to a broad variety of 3-substituted and 3,3-disubstituted oxetanes. The reaction provides direct and general access to synthetically valuable 1,3-bromohydrin building blocks from easily accessed achiral precursors. The products are readily elaborated both by nucleophilic substitution and through transition-metal-catalyzed cross-coupling reactions. The enantioselective catalytic oxetane ring opening was employed as part of a three-step, gram-scale synthesis of pretomanid, a recently approved medication for the treatment of multidrug-resistant tuberculosis. Heavy-atom kinetic isotope effect (KIE) studies are consistent with enantiodetermining delivery of bromide from the H-bond-donor (HBD) catalyst to the activated oxetane. While the nucleophilicity of the bromide ion is expected to be attenuated by association to the HBD, overall rate acceleration is achieved by enhancement of Lewis acidity of the TMSBr reagent through anion abstraction.
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Affiliation(s)
| | | | - Elias Picazo
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Eric N. Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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22
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Synthesis of morpholine derivatives using the Castagnoli-Cushman reaction as BACE1 inhibitors: Unexpected binding activity of cyclic thioamides. Bioorg Med Chem Lett 2020; 30:127211. [PMID: 32354570 DOI: 10.1016/j.bmcl.2020.127211] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 04/20/2020] [Accepted: 04/23/2020] [Indexed: 01/18/2023]
Abstract
The Castagnoli-Cushman reaction between diglycolic anhydride and imines was applied for the synthesis of morpholine derivatives containing a thioamide or an amidino group. Enzyme inhibition assays towards BACE1 revealed an unexpected role of the cyclic thioamide group in providing inhibition in the micromolar range. Molecular docking calculations showed the thioamido group interacting with catalytic aspartic acid, and calculated BBB permeability indicated this molecular scaffold as a promising hit for further optimization.
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23
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Lin Y, Hirschi WJ, Kunadia A, Paul A, Ghiviriga I, Abboud KA, Karugu RW, Vetticatt MJ, Hirschi JS, Seidel D. A Selenourea-Thiourea Brønsted Acid Catalyst Facilitates Asymmetric Conjugate Additions of Amines to α,β-Unsaturated Esters. J Am Chem Soc 2020; 142:5627-5635. [PMID: 32118419 PMCID: PMC7533150 DOI: 10.1021/jacs.9b12457] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
β-Amino esters are obtained with high levels of enantioselectivity via the conjugate addition of cyclic amines to unactivated α,β-unsaturated esters. A related strategy enables the kinetic resolution of racemic cyclic 2-arylamines, using benzyl acrylate as the resolving agent. Reactions are facilitated by an unprecedented selenourea-thiourea organocatalyst. As elucidated by DFT calculations and 13C kinetic isotope effect studies, the rate-limiting and enantiodetermining step of the reaction is the protonation of a zwitterionic intermediate by the catalyst. This represents a rare case in which a thiourea compound functions as an asymmetric Brønsted acid catalyst.
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Affiliation(s)
- Yingfu Lin
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - William J Hirschi
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Anuj Kunadia
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Ion Ghiviriga
- Center for NMR Spectroscopy, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Khalil A Abboud
- Center for X-ray Crystallography, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Rachael W Karugu
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Mathew J Vetticatt
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Jennifer S Hirschi
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
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24
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Huang J, Shia K. Development of a Cross‐Conjugated Vinylogous [4+2] Anionic Annulation and Application to the Total Synthesis of Natural Antibiotic (±)‐ABX. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914657] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jing‐Kai Huang
- Institute of Biotechnology and Pharmaceutical ResearchNational Health Research Institutes 35 Keyan Road Zhunan Miaoli County 35053 Taiwan, R.O.C
| | - Kak‐Shan Shia
- Institute of Biotechnology and Pharmaceutical ResearchNational Health Research Institutes 35 Keyan Road Zhunan Miaoli County 35053 Taiwan, R.O.C
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25
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Huang JK, Shia KS. Development of a Cross-Conjugated Vinylogous [4+2] Anionic Annulation and Application to the Total Synthesis of Natural Antibiotic (±)-ABX. Angew Chem Int Ed Engl 2020; 59:6540-6545. [PMID: 31944523 PMCID: PMC7187479 DOI: 10.1002/anie.201914657] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 01/02/2020] [Indexed: 12/14/2022]
Abstract
The cross‐conjugated vinylogous [4+2] anionic annulation has been newly developed, the cascade process of which has a high preference for regiochemical control and chemoselectivity, giving rise to exclusively Michael‐type adducts in moderate to high yields (up to 94 %, 35 examples). By making use of this approach as a key operation, the first total synthesis of natural antibiotic ABX, in racemic form, has been successfully achieved in a concise 7‐step sequence with an overall yield of about 20 %.
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Affiliation(s)
- Jing-Kai Huang
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County, 35053, Taiwan, R.O.C
| | - Kak-Shan Shia
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County, 35053, Taiwan, R.O.C
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26
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Chang Z, Ye C, Fu J, Chigumbu P, Zeng X, Wang Y, Jiang C, Han X. Enantioselective Synthesis of Oxindole‐Derived α‐Aryl‐β‐Amino Acid Derivatives and δ‐Lactams with Homophthalic Anhydrides. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201901074] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Zhixin Chang
- Zhejiang Provincial Key Laboratory for Chemical & Biological Processing Technology of Farm Products, School of Biological and Chemical EngineeringZhejiang University of Science and Technology Hangzhou 310023 People's Republic of China
| | - Can Ye
- Zhejiang Provincial Key Laboratory for Chemical & Biological Processing Technology of Farm Products, School of Biological and Chemical EngineeringZhejiang University of Science and Technology Hangzhou 310023 People's Republic of China
| | - Junfeng Fu
- Zhejiang Provincial Key Laboratory for Chemical & Biological Processing Technology of Farm Products, School of Biological and Chemical EngineeringZhejiang University of Science and Technology Hangzhou 310023 People's Republic of China
| | - Paidamoyo Chigumbu
- Zhejiang Provincial Key Laboratory for Chemical & Biological Processing Technology of Farm Products, School of Biological and Chemical EngineeringZhejiang University of Science and Technology Hangzhou 310023 People's Republic of China
| | - Xiaofei Zeng
- College of Materials, Chemistry and Chemical EngineeringHangzhou Normal University Hangzhou 310036 People's Republic of China
| | - Yongjiang Wang
- Zhejiang Provincial Key Laboratory for Chemical & Biological Processing Technology of Farm Products, School of Biological and Chemical EngineeringZhejiang University of Science and Technology Hangzhou 310023 People's Republic of China
| | - Chengjun Jiang
- Zhejiang Provincial Key Laboratory for Chemical & Biological Processing Technology of Farm Products, School of Biological and Chemical EngineeringZhejiang University of Science and Technology Hangzhou 310023 People's Republic of China
| | - Xiaoyu Han
- Zhejiang Provincial Key Laboratory for Chemical & Biological Processing Technology of Farm Products, School of Biological and Chemical EngineeringZhejiang University of Science and Technology Hangzhou 310023 People's Republic of China
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27
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Highly Enantioselective Catalytic Kinetic Resolution of α‐Branched Aldehydes through Formal Cycloaddition with Homophthalic Anhydrides. Chemistry 2019; 25:10074-10079. [DOI: 10.1002/chem.201902422] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Indexed: 01/12/2023]
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28
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Laws SW, Howard SY, Mato R, Meng S, Fettinger JC, Shaw JT. Organocatalytic Mukaiyama Mannich Reactions of 2,5-Bis(trimethylsilyloxy)furan. Org Lett 2019; 21:5073-5077. [PMID: 31247788 DOI: 10.1021/acs.orglett.9b01664] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The organocatalytic synthesis of densely substituted mono- and bis-γ-lactams involving the Mukaiyama Mannich addition of 2,5-bis(trimethylsilyloxy)furan to imines is described. Use of a ditoluenesulfonylimide catalyst produces γ-lactams from monoaddition, whereas a more acidic catalyst (triflic acid) produces fused bis-lactams from double addition. Optimized organocatalytic conditions allow for the selective synthesis of either desired core as well as the one-pot, multicomponent assembly of the trisubstituted monolactams from aldehydes, amines, and bis-trimethylsilyloxyfuran. An examination of chiral acids found these organocatalysts to be highly active and diastereoselective in the monoaddition reaction, albeit with no enantioselectivity.
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Affiliation(s)
- Stephen W Laws
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
| | - Sara Y Howard
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
| | - Raquel Mato
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
| | - Shuyu Meng
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
| | - James C Fettinger
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
| | - Jared T Shaw
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
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29
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Collar AG, Trujillo C, Connon SJ. Highly Enantio- and Diastereoselective Catalytic Asymmetric Tamura Cycloaddition Reactions. Chemistry 2019; 25:7270-7274. [PMID: 31050071 DOI: 10.1002/chem.201900119] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Indexed: 12/22/2022]
Abstract
The first broad-scope catalytic asymmetric Tamura cycloaddition reactions are reported. Under the influence of anion-binding bifunctional catalysis a wide range of α,β-unsaturated N-trityl imines undergo reactions with enolisable anhydrides to form highly synthetically useful α-tetralone structures with excellent enantio- and -diastereocontrol. In stark contrast to the previous literature benchmarks, doubly activated or highly electron deficient alkenes are not required. A facile two-step, high yielding sequence can convert the cycloadducts to α-haloketones (challenging to generate catalytically by other means) with the net formation of two new C-C bonds and three new contiguous stereocentres with exquisite stereocontrol. A DFT study has provided insight into the catalyst mode of action and the origins of the observed enantiocontrol.
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Affiliation(s)
- Aarón Gutiérrez Collar
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin, 2, Ireland
| | - Cristina Trujillo
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin, 2, Ireland
| | - Stephen J Connon
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin, 2, Ireland
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30
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Wu R, Li J, Wang Y, Quan Z, Su Y, Huo C. Copper‐Catalyzed Aerobic Oxidative Dehydrogenative Ring‐Opening Reaction of Glycine Esters with α′‐Angelicalactone: Approach to Construct α‐Amino‐γ‐Ketopimelates. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Rui Wu
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials; College of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou, Gansu 730070 People's Republic of China
| | - Jun Li
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials; College of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou, Gansu 730070 People's Republic of China
| | - Yajun Wang
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials; College of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou, Gansu 730070 People's Republic of China
| | - Zhengjun Quan
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials; College of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou, Gansu 730070 People's Republic of China
| | - Yingpeng Su
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials; College of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou, Gansu 730070 People's Republic of China
| | - Congde Huo
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials; College of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou, Gansu 730070 People's Republic of China
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31
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Collar AG, Trujillo C, Lockett-Walters B, Twamley B, Connon SJ. Catalytic Asymmetric γ-Lactam Synthesis from Enolisable Anhydrides and Imines. Chemistry 2019; 25:7275-7279. [PMID: 31050082 DOI: 10.1002/chem.201901028] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Indexed: 01/18/2023]
Abstract
An anion-binding approach to the problem of preparing enantioenriched γ-lactams from enolisable anhydrides and imines is reported. A simple bisurea catalyst promotes the cycloaddition between α-aryl succinic anhydrides and either PMP- or benzhydryl-protected aldimines to provide γ-lactams with two contiguous stereocentres (one quaternary) with complete diastereocontrol and high to excellent enantioselectivity for the first time. A DFT study has provided insight into the catalyst mode of action and the origins of the observed stereocontrol.
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Affiliation(s)
- Aarón Gutiérrez Collar
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland
| | - Cristina Trujillo
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland
| | - Bruce Lockett-Walters
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland
| | - Brendan Twamley
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland
| | - Stephen J Connon
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland
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32
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Attard JW, Osawa K, Guan Y, Hatt J, Kondo SI, Mattson A. Silanediol Anion Binding and Enantioselective Catalysis. SYNTHESIS-STUTTGART 2019; 51:2107-2115. [PMID: 31178610 PMCID: PMC6548508 DOI: 10.1055/s-0037-1612217] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Silanediols possess unique and complementary catalytic activity in reactions that are likely to proceed through anion binding. This article directly compares silanediols, thioureas, and squaramides in three separate anion-binding processes. The catalytic abilities of select members of each family are directly correlated to association constant.
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Affiliation(s)
- Jonathan W. Attard
- Worcester Polytechnic Institute, Department of Chemistry and Biochemistry, Worcester, MA 01609, USA
| | - Kohei Osawa
- Yamagata University, Department of Science, Faculty of Science, Yamagata, Yamagata 990-8560, Japan
| | - Yong Guan
- Worcester Polytechnic Institute, Department of Chemistry and Biochemistry, Worcester, MA 01609, USA
| | - Jessica Hatt
- Worcester Polytechnic Institute, Department of Chemistry and Biochemistry, Worcester, MA 01609, USA
| | - Shin-ichi Kondo
- Yamagata University, Department of Science, Faculty of Science, Yamagata, Yamagata 990-8560, Japan
| | - Anita Mattson
- Worcester Polytechnic Institute, Department of Chemistry and Biochemistry, Worcester, MA 01609, USA
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33
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Hydroxylamine as an ammonia equivalent: access to NH-tetrahydroisoquinolonic derivatives from aldoximes by the Castagnoli–Cushman reaction followed by reduction. MENDELEEV COMMUNICATIONS 2019. [DOI: 10.1016/j.mencom.2019.05.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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34
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Burlow NP, Howard SY, Saunders CM, Fettinger JC, Tantillo DJ, Shaw JT. Formal [4 + 2] Cycloadditions of Anhydrides and α,β-Unsaturated N-Tosyl Ketimines. Org Lett 2019; 21:1046-1049. [PMID: 30721078 DOI: 10.1021/acs.orglett.8b04091] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A method for the diastereoselective synthesis of highly substituted β-enamino ketones from anhydrides and ketone-derived imines is reported. Cyclic, enolizable anhydrides undergo a base-promoted conjugate addition reaction with α,β-unsaturated N-tosyl ketimines, followed by an intramolecular acylation to give formal [4 + 2] cycloaddition products. The carboxylic acid-containing products are formed with modest selectivity for the cis-diastereomer and can be fully epimerized to the trans-diastereomer upon esterification.
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Affiliation(s)
- Noah P Burlow
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
| | - Sara Y Howard
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
| | - Carla M Saunders
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
| | - James C Fettinger
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
| | - Dean J Tantillo
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
| | - Jared T Shaw
- Department of Chemistry , University of California , One Shields Ave , Davis , California 95616 , United States
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35
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Lockett-Walters B, Trujillo C, Twamley B, Connon S. The base-catalysed Tamura cycloaddition reaction: calculation, mechanism, isolation of intermediates and asymmetric catalysis. Chem Commun (Camb) 2019; 55:11283-11286. [DOI: 10.1039/c9cc05064g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A combination of experimental and computational techniques has shown that the mechanism of the base-catalysed Tamura cycloaddition is not a concerted Diels–Alder process.
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Affiliation(s)
- Bruce Lockett-Walters
- School of Chemistry
- Trinity Biomedical Sciences Institute
- Trinity College Dublin
- Dublin 2
- Ireland
| | - Cristina Trujillo
- School of Chemistry
- Trinity Biomedical Sciences Institute
- Trinity College Dublin
- Dublin 2
- Ireland
| | - Brendan Twamley
- School of Chemistry
- Trinity Biomedical Sciences Institute
- Trinity College Dublin
- Dublin 2
- Ireland
| | - Stephen Connon
- School of Chemistry
- Trinity Biomedical Sciences Institute
- Trinity College Dublin
- Dublin 2
- Ireland
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36
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Aiello ML, Farid U, Trujillo C, Twamley B, Connon SJ. Catalytic Asymmetric Cycloadditions between Aldehydes and Enolizable Anhydrides: cis-Selective Dihydroisocoumarin Formation. J Org Chem 2018; 83:15499-15511. [PMID: 30461274 DOI: 10.1021/acs.joc.8b02332] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In the presence of a trityl-substituted cinchona alkaloid-based catalyst, homophthalic, aryl succinic, and glutaconic anhydride derivatives reacted with aromatic and aliphatic aldehydes to produce cis-lactones in up to 90:10 dr and 99% ee. A DFT study has shown how the catalyst is uniquely able to bring about the opposite sense of diastereocontrol to that usually observed.
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Affiliation(s)
- Maria Luisa Aiello
- Trinity Biomedical Sciences Institute, School of Chemistry , The University of Dublin, Trinity College , Dublin 2 , Ireland
| | - Umar Farid
- Trinity Biomedical Sciences Institute, School of Chemistry , The University of Dublin, Trinity College , Dublin 2 , Ireland
| | - Cristina Trujillo
- Trinity Biomedical Sciences Institute, School of Chemistry , The University of Dublin, Trinity College , Dublin 2 , Ireland
| | - Brendan Twamley
- Trinity Biomedical Sciences Institute, School of Chemistry , The University of Dublin, Trinity College , Dublin 2 , Ireland
| | - Stephen J Connon
- Trinity Biomedical Sciences Institute, School of Chemistry , The University of Dublin, Trinity College , Dublin 2 , Ireland
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37
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Claveau R, Twamley B, Connon SJ. Synthesis of α-alkylated γ-butyrolactones with concomitant anhydride kinetic resolution using a sulfamide-based catalyst. Org Biomol Chem 2018; 16:7574-7578. [PMID: 30307019 DOI: 10.1039/c8ob02248h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Kinetic Resolution (KR) of α-alkylated enolisable disubstituted anhydrides has been shown to be possible for the first time. In the presence of an ad hoc designed novel class of bifunctional sulfamide organocatalyst, a regio-, diastereo- and enantioselective cycloaddition reaction between the enolisable anhydride and benzaldehydes provides densely functionalised γ-butyrolactones in one pot (up to 19 : 1 dr, 94% ee) with control over three contiguous stereocentres. The concomitant resolution of the starting material anhydride, provides access to a range of chiral succinate derivatives with selectivity factors up to S* = 10.5.
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Affiliation(s)
- Romain Claveau
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin 152-160, Pearse Street, Dublin 2, Ireland.
| | - Brendan Twamley
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin 152-160, Pearse Street, Dublin 2, Ireland.
| | - Stephen J Connon
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin 152-160, Pearse Street, Dublin 2, Ireland.
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38
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Das BK, Pradhan S, Punniyamurthy T. Stereospecific Ring Opening and Cycloisomerization of Aziridines with Propargylamines: Synthesis of Functionalized Piperazines and Tetrahydropyrazines. Org Lett 2018; 20:4444-4448. [DOI: 10.1021/acs.orglett.8b01723] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bijay Ketan Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Sourav Pradhan
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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39
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Jarvis CL, Jemal NM, Knapp S, Seidel D. Formal [4 + 2] cycloaddition of imines with alkoxyisocoumarins. Org Biomol Chem 2018; 16:4231-4235. [PMID: 29796555 PMCID: PMC6082175 DOI: 10.1039/c8ob01015c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new preparation of δ-lactams is reported. In the presence of a Lewis acid promoter, alkoxyisocoumarins engage a range of N-aryl and N-alkyl imines to form δ-lactams with a pendent carboalkoxy substituent. A sulfonamide-thiourea catalyst enables the synthesis of these products in moderate to good enantioselectivities.
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Affiliation(s)
- Claire L Jarvis
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA.
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40
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Claveau R, Twamley B, Connon SJ. Dynamic kinetic resolution of bis-aryl succinic anhydrides: enantioselective synthesis of densely functionalised γ-butyrolactones. Chem Commun (Camb) 2018. [PMID: 29533401 DOI: 10.1039/c8cc00609a] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The efficient Dynamic Kinetic Resolution (DKR) of disubstituted anhydrides has been shown to be possible for the first time. Using an ad hoc designed organocatalyst and an enantio- and diastereoselective cycloaddition process with aldehydes, stereochemically complex γ-butyrolactone derivatives can be obtained - with control over three contiguous stereocentres, one of which is all carbon quaternary.
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Affiliation(s)
- Romain Claveau
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland.
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41
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Ito S, Okada S, Sue R, Asami M. Synthesis of Macrocyclic Hexamine from Naphthalene-based C2-Symmetric Chiral Diamine and Dialdehyde. CHEM LETT 2018. [DOI: 10.1246/cl.171100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Suguru Ito
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Shiori Okada
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Rika Sue
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Masatoshi Asami
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
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42
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Zhang T, Ma C, Zhou JY, Mei GJ, Shi F. Application of Homophthalic Anhydrides as 2C Building Blocks in Catalytic Asymmetric Cyclizations of ortho
-Quinone Methides: Diastereo- and Enantioselective Construction of Dihydrocoumarin Frameworks. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701333] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Ting Zhang
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
| | - Chun Ma
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
| | - Jia-Yu Zhou
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
| | - Guang-Jian Mei
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
| | - Feng Shi
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
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43
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Abstract
Homophthalic anhydride (HPA) typically reacts rapidly with benzalimines to afford the formal [4+2] adduct, a 1,2,3,4-tetrahydroisoquinolin-1-one-4-carboxylic acid. The stereochemical outcome of this reaction is consistent with an open transition state comprising an iminium species and enolized HPA, leading to a short-lived amino-anhydride intermediate. In the case of N-tert-butylbenzalimine, this Mannich-type intermediate, which would normally cyclize at low temperature to a single isomer of the delta-lactam, is intercepted by base treatment to afford beta-lactam products. A pathway featuring ketene formation followed by ring closure is implicated.
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44
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Chizhova M, Dar'in D, Krasavin M. Complications in the Castagnoli-Cushman reaction: An unusual course of reaction between cyclic anhydrides and sterically hindered indolenines. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.07.077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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45
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Laws SW, Moore LC, Di Maso MJ, Nguyen QNN, Tantillo DJ, Shaw JT. Diastereoselective Base-Catalyzed Formal [4 + 2] Cycloadditions of N-Sulfonyl Imines and Cyclic Anhydrides. Org Lett 2017; 19:2466-2469. [PMID: 28474515 DOI: 10.1021/acs.orglett.7b00468] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A diastereoselective base-catalyzed Mannich reaction of cyclic, enolizable anhydrides and N-sulfonyl imines for the synthesis of δ-lactams is reported. This anhydride Mannich reaction tolerates imines derived from aryl and enolizable aldehydes. A base-catalyzed product epimerization pathway ensures high anti diastereoselectivity in aryl and achiral enolizable imines.
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Affiliation(s)
- Stephen W Laws
- Department of Chemistry, University of California , One Shields Avenue, Davis, California 95616, United States
| | - Lucas C Moore
- Department of Chemistry, University of California , One Shields Avenue, Davis, California 95616, United States
| | - Michael J Di Maso
- Department of Chemistry, University of California , One Shields Avenue, Davis, California 95616, United States
| | - Q Nhu N Nguyen
- Department of Chemistry, University of California , One Shields Avenue, Davis, California 95616, United States
| | - Dean J Tantillo
- Department of Chemistry, University of California , One Shields Avenue, Davis, California 95616, United States
| | - Jared T Shaw
- Department of Chemistry, University of California , One Shields Avenue, Davis, California 95616, United States
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46
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Nath U, Pan SC. Organocatalytic Asymmetric Tamura Cycloaddition with α- Branched Nitroolefins: Synthesis of Functionalized 1-Tetralones. J Org Chem 2017; 82:3262-3269. [PMID: 28226211 DOI: 10.1021/acs.joc.6b03020] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new catalytic asymmetric Tamura cycloaddition with nitroolefins was developed. This demonstration of the reaction of α-branched nitroolefins with homophthalic anhydrides delivers highly functionalized 1-tetralone compounds. With bifunctional squaramide catalyst, the desired tetralone products are obtained with high enantioselectivity and good diastereoselectivity.
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Affiliation(s)
- Utpal Nath
- Department of Chemistry, Indian Institute of Technology Guwahati , North Guwahati, Assam 781039, India
| | - Subhas Chandra Pan
- Department of Chemistry, Indian Institute of Technology Guwahati , North Guwahati, Assam 781039, India
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47
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Affiliation(s)
- Zheng Wang
- Department of Chemistry & Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Rd., Piscataway, New Jersey 08854, United States
| | - Robert D. Barrows
- Department of Chemistry & Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Rd., Piscataway, New Jersey 08854, United States
| | - Thomas J. Emge
- Department of Chemistry & Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Rd., Piscataway, New Jersey 08854, United States
| | - Spencer Knapp
- Department of Chemistry & Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Rd., Piscataway, New Jersey 08854, United States
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48
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Trujillo C, Rozas I, Botte A, Connon SJ. A DFT mechanistic study of the organocatalytic asymmetric reaction of aldehydes and homophthalic anhydride. Chem Commun (Camb) 2017; 53:8874-8877. [DOI: 10.1039/c7cc04596d] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The first study of the cycloaddition of benzaldehyde with homophthalic anhydride under the influence of an alkaloid-based, squaramide substituted bifunctional organocatalyst using DFT methodology is reported.
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Affiliation(s)
- Cristina Trujillo
- School of Chemistry
- Trinity Biomedical Sciences Institute
- Trinity College Dublin
- Dublin 2
- Ireland
| | - Isabel Rozas
- School of Chemistry
- Trinity Biomedical Sciences Institute
- Trinity College Dublin
- Dublin 2
- Ireland
| | - Astrid Botte
- School of Chemistry
- Trinity Biomedical Sciences Institute
- Trinity College Dublin
- Dublin 2
- Ireland
| | - Stephen J. Connon
- School of Chemistry
- Trinity Biomedical Sciences Institute
- Trinity College Dublin
- Dublin 2
- Ireland
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