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Alemán J, Humbrías-Martín J, Del Río-Rodríguez R, Aguilar-Galindo F, Díaz-Tendero S, Fernández-Salas JA. Bicarbonate-binding catalysis for the enantioselective desymmetrization of keto sulfonium salts. Nat Commun 2024; 15:4727. [PMID: 38830865 PMCID: PMC11148132 DOI: 10.1038/s41467-024-48832-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Accepted: 05/14/2024] [Indexed: 06/05/2024] Open
Abstract
Herein, an enantioselective desymmetrization of cyclic keto sulfonium salts through enantioselective deprotonation/ring opening process by anion-binding catalysis is presented. We report a squaramide/HCO3- complex as catalytic active species which is able to stereo-differentiate two enantiomeric protons, triggering the ring opening event taking advantage of the great tendency of sulfonium salts to act as leaving groups. Thus, this desymmetrization methodology give rise to β-methylsulfenylated sulfa-Michael addition type products with excellent yields and very good enantioselectivities. The bifunctional organocatalyst has been demonstrated to be capable of activating simultaneously the base and the keto sulfonium salt by DFT calculations and experimental proofs.
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Affiliation(s)
- José Alemán
- Departamento de Química Orgánica (módulo 1), Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain.
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain.
- Center for Innovation in Advanced Chemistry (ORFEO-CINQA), Universidad Autónoma de Madrid, Madrid, Spain.
| | - Jorge Humbrías-Martín
- Departamento de Química Orgánica (módulo 1), Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain
| | - Roberto Del Río-Rodríguez
- Departamento de Química Orgánica (módulo 1), Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain
| | - Fernando Aguilar-Galindo
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
- Departamento de Química, Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain
| | - Sergio Díaz-Tendero
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
- Departamento de Química, Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain
- Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain
| | - Jose A Fernández-Salas
- Departamento de Química Orgánica (módulo 1), Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain.
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain.
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2
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Ovian JM, Vojáčková P, Jacobsen EN. Enantioselective transition-metal catalysis via an anion-binding approach. Nature 2023; 616:84-89. [PMID: 36787801 PMCID: PMC10388379 DOI: 10.1038/s41586-023-05804-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 02/06/2023] [Indexed: 02/16/2023]
Abstract
Asymmetric transition-metal catalysis represents a powerful strategy for accessing enantiomerically enriched molecules1-3. The classical strategy for inducing enantioselectivity with transition-metal catalysts relies on direct complexation of chiral ligands to produce a sterically constrained reactive metal site that allows formation of the major product enantiomer while effectively inhibiting the pathway to the minor enantiomer through steric repulsion4. The chiral-ligand strategy has proven applicable to a wide variety of highly enantioselective transition-metal-catalysed reactions, but important scenarios exist that impose limits to its successful adaptation. Here, we report a new approach for inducing enantioselectivity in transition-metal-catalysed reactions that relies on neutral hydrogen-bond donors (HBDs)5,6 that bind anions of cationic transition-metal complexes to achieve enantiocontrol and rate enhancement through ion pairing together with other non-covalent interactions7-9. A cooperative anion-binding effect of a chiral bis-thiourea HBD is demonstrated to lead to high enantioselectivity (up to 99% enantiomeric excess) in intramolecular ruthenium-catalysed propargylic substitution reactions10. Experimental and computational mechanistic studies show the attractive interactions between electron-deficient arene components of the HBD and the metal complex that underlie enantioinduction and the acceleration effect.
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Affiliation(s)
- John M Ovian
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
| | - Petra Vojáčková
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
| | - Eric N Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA.
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3
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Anizadeh MR, Torabi M, Zolfigol MA, Yarie M. Catalytic application Fe3O4@SiO2@(CH2)3-urea-dithiocarbamic acid for the synthesis of triazole-linked pyridone derivatives. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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4
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Peluso P, Chankvetadze B. Recognition in the Domain of Molecular Chirality: From Noncovalent Interactions to Separation of Enantiomers. Chem Rev 2022; 122:13235-13400. [PMID: 35917234 DOI: 10.1021/acs.chemrev.1c00846] [Citation(s) in RCA: 57] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
It is not a coincidence that both chirality and noncovalent interactions are ubiquitous in nature and synthetic molecular systems. Noncovalent interactivity between chiral molecules underlies enantioselective recognition as a fundamental phenomenon regulating life and human activities. Thus, noncovalent interactions represent the narrative thread of a fascinating story which goes across several disciplines of medical, chemical, physical, biological, and other natural sciences. This review has been conceived with the awareness that a modern attitude toward molecular chirality and its consequences needs to be founded on multidisciplinary approaches to disclose the molecular basis of essential enantioselective phenomena in the domain of chemical, physical, and life sciences. With the primary aim of discussing this topic in an integrated way, a comprehensive pool of rational and systematic multidisciplinary information is provided, which concerns the fundamentals of chirality, a description of noncovalent interactions, and their implications in enantioselective processes occurring in different contexts. A specific focus is devoted to enantioselection in chromatography and electromigration techniques because of their unique feature as "multistep" processes. A second motivation for writing this review is to make a clear statement about the state of the art, the tools we have at our disposal, and what is still missing to fully understand the mechanisms underlying enantioselective recognition.
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Affiliation(s)
- Paola Peluso
- Istituto di Chimica Biomolecolare ICB, CNR, Sede secondaria di Sassari, Traversa La Crucca 3, Regione Baldinca, Li Punti, I-07100 Sassari, Italy
| | - Bezhan Chankvetadze
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Chavchavadze Avenue 3, 0179 Tbilisi, Georgia
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5
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Roy S, Paul H, Chatterjee I. Light‐Mediated Aminocatalysis: The Dual‐Catalytic Ability Enabling New Enantioselective Route. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Sourav Roy
- IIT Ropar: Indian Institute of Technology Ropar Chemistry INDIA
| | - Hrishikesh Paul
- IIT Ropar: Indian Institute of Technology Ropar Chemistry INDIA
| | - Indranil Chatterjee
- Indian Institute of Technology, Ropar Chemistry Nangal Road 140001 Rupnagar INDIA
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6
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Crystal structure, DFT-study and NLO properties of the novel copper(I) nitrate π,σ-coordination compound based on 1-allyl-3-norbornan-thiourea. Polyhedron 2022. [DOI: 10.1016/j.poly.2021.115545] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Zhu D, Chen ZM. Application of Chiral Lewis Base/Brønsted Acid Synergistic Catalysis Strategy in Enantioselective Synthesis of Organic Sulfides. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202208032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Zhao C, Sun C, Li X, Zeng Y. Aza‐Diels‐Alder Reaction of Danishefsky's Diene with Imine Catalyzed by N‐Heterocyclic Imidazole Halogen Bond Donors. ChemistrySelect 2021. [DOI: 10.1002/slct.202103487] [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)
- Chang Zhao
- College of Chemistry and Materials Science Hebei Normal University Shijiazhuang 050024 China
| | - Cuihong Sun
- College of Chemical Engineering Shijiazhuang University Shijiazhuang 050035 China
| | - Xiaoyan Li
- College of Chemistry and Materials Science Hebei Normal University Shijiazhuang 050024 China
| | - Yanli Zeng
- College of Chemistry and Materials Science Hebei Normal University Shijiazhuang 050024 China
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9
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Thiyagarajan R, Begum Z, Seki C, Okuyama Y, Kwon E, Uwai K, Tokiwa M, Tokiwa S, Takeshita M, Nakano H. New small γ-turn type N-primary amino terminal tripeptide organocatalyst for solvent-free asymmetric aldol reaction of various ketones with aldehydes. RSC Adv 2021; 11:38925-38932. [PMID: 35493209 PMCID: PMC9044195 DOI: 10.1039/d1ra08635a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 11/30/2021] [Indexed: 01/18/2023] Open
Abstract
New small γ-turn type N-primary amino terminal tripeptides were synthesized and their functionality as an organocatalyst was examined in the asymmetric aldol reaction of various ketones with different aromatic aldehydes under solvent-free neat conditions to afford the desired chiral anti-aldol products in good to excellent chemical yields, diastereoselectivities and enantioselectivities (up to 99%, up to syn : anti/13 : 87 dr, up to 99% ee).
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Affiliation(s)
- Rajkumar Thiyagarajan
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology 27-1 Mizumoto-cho Muroran 050-8585 Japan
| | - Zubeda Begum
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology 27-1 Mizumoto-cho Muroran 050-8585 Japan
| | - Chigusa Seki
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology 27-1 Mizumoto-cho Muroran 050-8585 Japan
| | - Yuko Okuyama
- Tohoku Medical and Pharmaceutical University 4-4-1 Komatsushima Aoba-Ku Sendai 981-8558 Japan
| | - Eunsang Kwon
- Research and Analytical Center for Giant Molecules, Graduate School of Sciences,Tohoku Medical and Pharmaceutical University 4-4-1 Komatsushima Aoba-Ku Sendai 981-8558 Japan
| | - Koji Uwai
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology 27-1 Mizumoto-cho Muroran 050-8585 Japan
| | - Michio Tokiwa
- Tokiwakai Group 62 Numajiri Tsuduri-Chou Uchigo Iwaki 973-8053 Japan
| | - Suguru Tokiwa
- Tokiwakai Group 62 Numajiri Tsuduri-Chou Uchigo Iwaki 973-8053 Japan
| | | | - Hiroto Nakano
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology 27-1 Mizumoto-cho Muroran 050-8585 Japan
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10
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11
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Gómez‐Martínez M, del Carmen Pérez‐Aguilar M, Piekarski DG, Daniliuc CG, García Mancheño O. N,N-Dialkylhydrazones as Versatile Umpolung Reagents in Enantioselective Anion-Binding Catalysis. Angew Chem Int Ed Engl 2021; 60:5102-5107. [PMID: 33306858 PMCID: PMC7986925 DOI: 10.1002/anie.202013380] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Indexed: 12/31/2022]
Abstract
An enantioselective anion-binding organocatalytic approach with versatile N,N-dialkylhydrazones (DAHs) as polarity-reversed (umpolung) nucleophiles is presented. For the application of this concept, a highly ordered hydrogen-bond (HB) network between a carefully selected CF3 -substituted triazole-based multidentate HB-donor catalyst, the ionic substrate and the hydrazone in a supramolecular chiral ion-pair complex was envisioned. The formation of such a network was further supported by both experimental and computational studies, which showed the crucial role of the anion as a template unit. The asymmetric Reissert-type reaction of quinolines as a model test reaction chemoselectively delivered highly enantiomerically enriched hydrazones (up 95:5 e.r.) that could be further derivatized to value-added compounds with up to three stereocenters.
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Affiliation(s)
| | | | - Dariusz G. Piekarski
- Organic Chemistry InstituteMünster UniversityCorrensstrasse 36MünsterGermany
- Current affiliation: Institute of Physical ChemistryPolish Academy of SciencesKasprzaka 44/52, 01-224WarsawPoland
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12
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Gómez‐Martínez M, Carmen Pérez‐Aguilar M, Piekarski DG, Daniliuc CG, García Mancheño O. N
,
N
‐Dialkylhydrazones as Versatile Umpolung Reagents in Enantioselective Anion‐Binding Catalysis. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202013380] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
| | | | - Dariusz G. Piekarski
- Organic Chemistry Institute Münster University Corrensstrasse 36 Münster Germany
- Current affiliation: Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52, 01-224 Warsaw Poland
| | | | - Olga García Mancheño
- Organic Chemistry Institute Münster University Corrensstrasse 36 Münster Germany
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13
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Retini M, Bartoccini F, Zappia G, Piersanti G. Novel, Chiral, and Enantiopure C
2
‐Symmetric Thioureas Promote Asymmetric Protio‐Pictet‐Spengler Reactions by Anion‐Binding Catalysis. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001501] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Michele Retini
- Dipartimento di Scienze Biomolecolari Università degli studi di Urbino Carlo Bo P.zza del Rinascimento 6 61029 Urbino Italy
| | - Francesca Bartoccini
- Dipartimento di Scienze Biomolecolari Università degli studi di Urbino Carlo Bo P.zza del Rinascimento 6 61029 Urbino Italy
| | - Giovanni Zappia
- Dipartimento di Scienze Biomolecolari Università degli studi di Urbino Carlo Bo P.zza del Rinascimento 6 61029 Urbino Italy
| | - Giovanni Piersanti
- Dipartimento di Scienze Biomolecolari Università degli studi di Urbino Carlo Bo P.zza del Rinascimento 6 61029 Urbino Italy
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14
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López R, Palomo C. N,N-Diacylaminals as Emerging Tools in Synthesis: From Peptidomimetics to Asymmetric Catalysis. Chemistry 2021; 27:20-29. [PMID: 32667706 DOI: 10.1002/chem.202002637] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 07/12/2020] [Indexed: 12/26/2022]
Abstract
N,N-Diacylaminals are flexible molecular scaffolds that have commonly been utilized as amide surrogates in peptidomimetics. The singularities of this motif as an N-acyl imine equivalent and as hydrogen-bond donor have recently opened new synthetic opportunities, especially in the field of asymmetric catalysis. This concept article highlights this diverse synthetic potential and provides the elements necessary for further developments.
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Affiliation(s)
- Rosa López
- Departamento de Química Orgánica I, Facultad de Química, Universidad del País Vasco (UPV/EHU), Manuel de Lardizabal 3, 20018, San Sebastián, Spain
| | - Claudio Palomo
- Departamento de Química Orgánica I, Facultad de Química, Universidad del País Vasco (UPV/EHU), Manuel de Lardizabal 3, 20018, San Sebastián, Spain
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15
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Kitagaki S, Shimo E, Takeda S, Fukai R, Kojima N, Yoshioka S, Takenaga N, Yoshida K. Planar Chiral [2.2]Paracyclophane-Based Bis(thiourea)-Catalyzed Highly Diastereo- and Enantioselective Michael Addition Reaction of Nitroethane to Nitrostyrenes. HETEROCYCLES 2021. [DOI: 10.3987/com-20-s(k)58] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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16
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A robust and tunable halogen bond organocatalyzed 2-deoxyglycosylation involving quantum tunneling. Nat Commun 2020; 11:4911. [PMID: 32999276 PMCID: PMC7527348 DOI: 10.1038/s41467-020-18595-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 08/26/2020] [Indexed: 11/10/2022] Open
Abstract
The development of noncovalent halogen bonding (XB) catalysis is rapidly gaining traction, as isolated reports documented better performance than the well-established hydrogen bonding thiourea catalysis. However, convincing cases allowing XB activation to be competitive in challenging bond formations are lacking. Herein, we report a robust XB catalyzed 2-deoxyglycosylation, featuring a biomimetic reaction network indicative of dynamic XB activation. Benchmarking studies uncovered an improved substrate tolerance compared to thiourea-catalyzed protocols. Kinetic investigations reveal an autoinductive sigmoidal kinetic profile, supporting an in situ amplification of a XB dependent active catalytic species. Kinetic isotopic effect measurements further support quantum tunneling in the rate determining step. Furthermore, we demonstrate XB catalysis tunability via a halogen swapping strategy, facilitating 2-deoxyribosylations of D-ribals. This protocol showcases the clear emergence of XB catalysis as a versatile activation mode in noncovalent organocatalysis, and as an important addition to the catalytic toolbox of chemical glycosylations. Halogen bonding (HB) catalysis is rapidly gaining momentum, however, cases of XB activation for challenging bonds formation are rare. Here, the authors show a robust XB catalyzed 2-deoxyglycosylation with broad scope and featuring a quantum tunneling phenomenon in the proton transfer rate determining step.
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17
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Vik EC, Li P, Maier JM, Madukwe DO, Rassolov VA, Pellechia PJ, Masson E, Shimizu KD. Large transition state stabilization from a weak hydrogen bond. Chem Sci 2020; 11:7487-7494. [PMID: 34123031 PMCID: PMC8159443 DOI: 10.1039/d0sc02806a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A series of molecular rotors was designed to study and measure the rate accelerating effects of an intramolecular hydrogen bond. The rotors form a weak neutral O–H⋯O
Created by potrace 1.16, written by Peter Selinger 2001-2019
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C hydrogen bond in the planar transition state (TS) of the bond rotation process. The rotational barrier of the hydrogen bonding rotors was dramatically lower (9.9 kcal mol−1) than control rotors which could not form hydrogen bonds. The magnitude of the stabilization was significantly larger than predicted based on the independently measured strength of a similar O–H⋯OC hydrogen bond (1.5 kcal mol−1). The origins of the large transition state stabilization were studied via experimental substituent effect and computational perturbation analyses. Energy decomposition analysis of the hydrogen bonding interaction revealed a significant reduction in the repulsive component of the hydrogen bonding interaction. The rigid framework of the molecular rotors positions and preorganizes the interacting groups in the transition state. This study demonstrates that with proper design a single hydrogen bond can lead to a TS stabilization that is greater than the intrinsic interaction energy, which has applications in catalyst design and in the study of enzyme mechanisms. A series of molecular rotors was designed to study and measure the rate accelerating effects of an intramolecular hydrogen bond.![]()
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Affiliation(s)
- Erik C Vik
- Department of Chemistry and Biochemistry, University of South Carolina Columbia SC 29208 USA
| | - Ping Li
- Department of Chemistry and Biochemistry, University of South Carolina Columbia SC 29208 USA
| | - Josef M Maier
- Department of Chemistry and Biochemistry, University of South Carolina Columbia SC 29208 USA
| | - Daniel O Madukwe
- Department of Chemistry and Biochemistry, University of South Carolina Columbia SC 29208 USA
| | - Vitaly A Rassolov
- Department of Chemistry and Biochemistry, University of South Carolina Columbia SC 29208 USA
| | - Perry J Pellechia
- Department of Chemistry and Biochemistry, University of South Carolina Columbia SC 29208 USA
| | - Eric Masson
- Department of Chemistry and Biochemistry, Ohio University Athens OH 45701 USA
| | - Ken D Shimizu
- Department of Chemistry and Biochemistry, University of South Carolina Columbia SC 29208 USA
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18
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Hu J, Zanca F, Lambe P, Tsuji M, Wijeweera S, Todisco S, Mastrorilli P, Shirley W, Benamara M, Moghadam PZ, Beyzavi H. (Thio)urea-Based Covalent Organic Framework as a Hydrogen-Bond-Donating Catalyst. ACS APPLIED MATERIALS & INTERFACES 2020; 12:29212-29217. [PMID: 32511903 PMCID: PMC7815320 DOI: 10.1021/acsami.0c04957] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Two-dimensional urea- and thiourea-containing covalent organic frameworks (COFs) were synthesized at ambient conditions at large scale within 1 h in the absence of an acid catalyst. The site-isolated urea and thiourea in the COF showed enhanced catalytic efficiency as a hydrogen-bond-donating organocatalyst compared to the molecular counterparts in epoxide ring-opening reaction, aldehyde acetalization, and Friedel-Crafts reaction. The COF catalysts also had excellent recyclability.
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Affiliation(s)
- Jiyun Hu
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Federica Zanca
- Department of Chemical and Biological Engineering, The University of Sheffield, Sheffield S13JD, United Kingdom
| | - Patricia Lambe
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Miu Tsuji
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Samantha Wijeweera
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | | | | | - William Shirley
- Department of Chemistry, Pittsburg State University, Pittsburg, Kansas 66762, United States
| | - Mourad Benamara
- Institute for Nanoscience & Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Peyman Z Moghadam
- Department of Chemical and Biological Engineering, The University of Sheffield, Sheffield S13JD, United Kingdom
| | - Hudson Beyzavi
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
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19
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Yoshimitsu T, Kuboyama Y, Nishiguchi S, Nakajima M, Sugiura M. O-Monoacyltartaric Acid/(Thio)urea Cooperative Organocatalysis for Enantioselective Conjugate Addition of Boronic Acid. Org Lett 2020; 22:3780-3784. [PMID: 32330049 DOI: 10.1021/acs.orglett.0c00981] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
(Thio)urea cocatalyst accelerates O-monoacyltartaric acid (MAT)-catalyzed enantioselective conjugate addition of boronic acid to unsaturated ketone. Kinetic studies of this reaction revealed first-order dependence of each substrate and catalyst and second-order dependence of (thio)urea, leading to reduction of the catalyst loading and development of more active and enantioselective MAT monoaryl ester catalyst.
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Affiliation(s)
- Takuto Yoshimitsu
- Faculty of Pharmaceutical Sciences, Sojo University, 4-22-1 Ikeda, Nishi-ku, Kumamoto 860-0082, Japan.,Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Yukinobu Kuboyama
- Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Sari Nishiguchi
- Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Makoto Nakajima
- Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Masaharu Sugiura
- Faculty of Pharmaceutical Sciences, Sojo University, 4-22-1 Ikeda, Nishi-ku, Kumamoto 860-0082, Japan
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20
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Lu D, Liu X, Wu J, Zhang S, Tan J, Yu X, Wang T. Asymmetric Construction of Bispiro‐Cyclopropane‐Pyrazolones via a [2+1] Cyclization Reaction by Dipeptide‐Based Phosphonium Salt Catalysis. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000073] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Dongming Lu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of ChemistrySichuan University Chengdu 610064 People's Republic of China
| | - Xin Liu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of ChemistrySichuan University Chengdu 610064 People's Republic of China
| | - Jia‐Hong Wu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of ChemistrySichuan University Chengdu 610064 People's Republic of China
| | - Song Zhang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of ChemistrySichuan University Chengdu 610064 People's Republic of China
| | - Jian‐Ping Tan
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of ChemistrySichuan University Chengdu 610064 People's Republic of China
| | - Xiaojun Yu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of ChemistrySichuan University Chengdu 610064 People's Republic of China
- Department of Chemistry, School of Basic Medical SciencesSouthwest Medical University Luzhou 646000 People's Republic of China
| | - Tianli Wang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of ChemistrySichuan University Chengdu 610064 People's Republic of China
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21
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Tan SL, Jotani MM, Tiekink ERT. 3,3-Bis(2-hy-droxy-eth-yl)-1-(4-nitro-benzo-yl)thio-urea: crystal structure, Hirshfeld surface analysis and computational study. Acta Crystallogr E Crystallogr Commun 2020; 76:155-161. [PMID: 32071739 PMCID: PMC7001817 DOI: 10.1107/s2056989019017328] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 12/29/2019] [Indexed: 11/10/2022]
Abstract
In the title compound, C12H15N3O5S, a tris-ubstituted thio-urea derivative, the central CN2S chromophore is almost planar (r.m.s. deviation = 0.018 Å) and the pendant hy-droxy-ethyl groups lie to either side of this plane. While to a first approximation the thione-S and carbonyl-O atoms lie to the same side of the mol-ecule, the S-C-N-C torsion angle of -47.8 (2)° indicates a considerable twist. As one of the hy-droxy-ethyl groups is orientated towards the thio-amide residue, an intra-molecular N-H⋯O hydrogen bond is formed which leads to an S(7) loop. A further twist in the mol-ecule is indicated by the dihedral angle of 65.87 (7)° between the planes through the CN2S chromophore and the 4-nitro-benzene ring. There is a close match between the experimental and gas-phase, geometry-optimized (DFT) mol-ecular structures. In the crystal, O-H⋯O and O-H⋯S hydrogen bonds give rise to supra-molecular layers propagating in the ab plane. The connections between layers to consolidate the three-dimensional architecture are of the type C-H⋯O, C-H⋯S and nitro-O⋯π. The nature of the supra-molecular association has been further analysed by a study of the calculated Hirshfeld surfaces, non-covalent inter-action plots and computational chemistry, all of which point to the significant influence and energy of stabilization provided by the conventional hydrogen bonds.
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Affiliation(s)
- Sang Loon Tan
- Research Centre for Crystalline Materials, School of Science and Technology, Sunway University, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia
| | - Mukesh M. Jotani
- Department of Physics, Bhavan’s Sheth R. A. College of Science, Ahmedabad, Gujarat 380001, India
| | - Edward R. T. Tiekink
- Research Centre for Crystalline Materials, School of Science and Technology, Sunway University, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia
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22
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Zhu C, Tang H, Yang K, Wu X, Luo Y, Wang J, Li Y. A urea-containing metal-organic framework as a multifunctional heterogeneous hydrogen bond-donating catalyst. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2019.105837] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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23
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Nakamura T, Okuno K, Nishiyori R, Shirakawa S. Hydrogen‐Bonding Catalysis of Alkyl‐Onium Salts. Chem Asian J 2020; 15:463-472. [DOI: 10.1002/asia.201901652] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Indexed: 12/20/2022]
Affiliation(s)
- Takumi Nakamura
- Department of Environmental ScienceGraduate School of Fisheries and Environmental SciencesNagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan
| | - Ken Okuno
- Department of Environmental ScienceGraduate School of Fisheries and Environmental SciencesNagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan
| | - Ryuichi Nishiyori
- Department of Environmental ScienceGraduate School of Fisheries and Environmental SciencesNagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan
| | - Seiji Shirakawa
- Department of Environmental ScienceGraduate School of Fisheries and Environmental SciencesNagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan
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24
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Smajlagic I, Guest M, Durán R, Herrera B, Dudding T. Mechanistic Insight toward Understanding the Role of Charge in Thiourea Organocatalysis. J Org Chem 2020; 85:585-593. [PMID: 31790584 DOI: 10.1021/acs.joc.9b02682] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pyranylation and glycosylation are pivotal for accessing a myriad of natural products, pharmaceuticals, and drug candidates. Catalytic approaches for enabling these transformations are of utmost importance and integral to advancing this area of synthesis. In exploring this chemical space, a combined experimental and computational mechanistic study of pyranylation and 2-deoxygalactosylation catalyzed by a cationic thiourea organocatalyst is reported. To this end, a thiourea-cyclopropenium organocatalyst was employed as a model system in combination with an arsenal of mechanistic techniques, including 13C kinetic isotope effect experiments, deuterated labeling studies, variable-temperature 1H NMR spectroscopy, and density functional theory calculations. From these studies, two distinct reaction pathways were identified for this transformation corresponding to either dual hydrogen bond (H-bond) activation or Brønsted acid catalysis. The former involving thiourea orchestrated bifurcated hydrogen bonding proceeded in an asynchronous concerted fashion. In contrast, the latter stepwise mechanism involving Brønsted acid catalysis hinged upon the formation of an oxocarbenium intermediate accompanied by subsequent alcohol addition.
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Affiliation(s)
- Ivor Smajlagic
- Brock University , 1812 Sir Isaac Brock Way , St. Catharines , ON L2S 3A1 , Canada
| | - Matt Guest
- Brock University , 1812 Sir Isaac Brock Way , St. Catharines , ON L2S 3A1 , Canada
| | - Rocío Durán
- Laboratorio de Química Teórica Computacional (QTC), Departamento de Química-Física, Facultad de Química y de Farmacia , Pontificia Universidad Católica de Chile , Av. Vicuña Mackenna 4860 , Macul, Santiago , Chile
| | - Barbara Herrera
- Laboratorio de Química Teórica Computacional (QTC), Departamento de Química-Física, Facultad de Química y de Farmacia , Pontificia Universidad Católica de Chile , Av. Vicuña Mackenna 4860 , Macul, Santiago , Chile
| | - Travis Dudding
- Brock University , 1812 Sir Isaac Brock Way , St. Catharines , ON L2S 3A1 , Canada
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25
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Grewal S, Roy S, Kumar H, Saraswat M, Bari NK, Sinha S, Venkataramani S. Temporal control in tritylation reactions through light-driven variation in chloride ion binding catalysis – a proof of concept. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01090a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A proof-of-concept on temporal control in the tritylation reactions has been demonstrated using a designed tripodal triazole-linked azo(hetero)arene-based photoswitchable catalyst.
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Affiliation(s)
- Surbhi Grewal
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Mohali
- Mohali
- India
| | - Saonli Roy
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Mohali
- Mohali
- India
| | - Himanshu Kumar
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Mohali
- Mohali
- India
| | - Mayank Saraswat
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Mohali
- Mohali
- India
| | - Naimat K. Bari
- Institute of Nano Science and Technology (INST)
- Mohali-160 062
- India
| | - Sharmistha Sinha
- Institute of Nano Science and Technology (INST)
- Mohali-160 062
- India
| | - Sugumar Venkataramani
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Mohali
- Mohali
- India
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26
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Smajlagic I, Carlson B, Rosano N, Foy H, Dudding T. Charge-enhanced thiourea catalysts as hydrogen bond donors for Friedel‒Crafts Alkylations. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130757] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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27
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Lejeune A, Le Goanvic L, Renouard T, Couturier J, Dubois J, Carpentier J, Rabiller‐Baudry M. Coupling Rhodium‐Catalyzed Hydroformylation of 10‐Undecenitrile with Organic Solvent Nanofiltration: Toluene Solution versus Solvent‐Free Processes. Chempluschem 2019; 84:1744-1760. [DOI: 10.1002/cplu.201900553] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 11/05/2019] [Indexed: 11/06/2022]
Affiliation(s)
- Antoine Lejeune
- Univ Rennes, CNRSISCR (Institut des Sciences Chimiques de Rennes)UMR 6226 35000 Rennes France
| | - Lucas Le Goanvic
- Univ Rennes, CNRSISCR (Institut des Sciences Chimiques de Rennes)UMR 6226 35000 Rennes France
| | - Thierry Renouard
- Univ Rennes, CNRSISCR (Institut des Sciences Chimiques de Rennes)UMR 6226 35000 Rennes France
| | | | - Jean‐Luc Dubois
- Arkema France 420 Rue d'Estienne d'Orves 92705 Colombes France
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28
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Tan SL, Azizan AHS, Jotani MM, Tiekink ERT. 3,3-Bis(2-hy-droxy-eth-yl)-1-(4-methyl-benzoyl)thio-urea: crystal structure, Hirshfeld surface analysis and computational study. Acta Crystallogr E Crystallogr Commun 2019; 75:1472-1478. [PMID: 31636978 PMCID: PMC6775753 DOI: 10.1107/s2056989019012581] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 09/09/2019] [Indexed: 11/15/2022]
Abstract
In the title tri-substituted thio-urea derivative, C13H18N2O3S, the thione-S and carbonyl-O atoms lie, to a first approximation, to the same side of the mol-ecule [the S-C-N-C torsion angle is -49.3 (2)°]. The CN2S plane is almost planar (r.m.s. deviation = 0.018 Å) with the hy-droxy-ethyl groups lying to either side of this plane. One hy-droxy-ethyl group is orientated towards the thio-amide functionality enabling the formation of an intra-molecular N-H⋯O hydrogen bond leading to an S(7) loop. The dihedral angle [72.12 (9)°] between the planes through the CN2S atoms and the 4-tolyl ring indicates the mol-ecule is twisted. The experimental mol-ecular structure is close to the gas-phase, geometry-optimized structure calculated by DFT methods. In the mol-ecular packing, hydroxyl-O-H⋯O(hydrox-yl) and hydroxyl-O-H⋯S(thione) hydrogen bonds lead to the formation of a supra-molecular layer in the ab plane; no directional inter-actions are found between layers. The influence of the specified supra-molecular inter-actions is apparent in the calculated Hirshfeld surfaces and these are shown to be attractive in non-covalent inter-action plots; the inter-action energies point to the important stabilization provided by directional O-H⋯O hydrogen bonds.
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Affiliation(s)
- Sang Loon Tan
- Research Centre for Crystalline Materials, School of Science and Technology, Sunway University, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia
| | - Ainnul Hamidah Syahadah Azizan
- Research Centre for Crystalline Materials, School of Science and Technology, Sunway University, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia
| | - Mukesh M. Jotani
- Department of Physics, Bhavan’s Sheth R. A. College of Science, Ahmedabad, Gujarat 380001, India
| | - Edward R. T. Tiekink
- Research Centre for Crystalline Materials, School of Science and Technology, Sunway University, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia
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29
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Yeo CI, Tiekink ER. Crystal structure of 3-[methyl(phenyl)amino]-1-phenylthiourea, C 14H 15N 3S. Z KRIST-NEW CRYST ST 2019. [DOI: 10.1515/ncrs-2019-0204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
C14H15N3S, monoclinic, P21/c (no. 14), a = 10.4801(1) Å, b = 10.8132(1) Å, c = 12.1341(1) Å, β = 107.823(1)°, V = 1309.08(2) Å3, Z = 4, R
gt(F) = 0.0266, wR
ref(F
2) = 0.0728, T = 100(2) K.
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Affiliation(s)
- Chien Ing Yeo
- Research Centre for Crystalline Materials, School of Science and Technology, Sunway University , 47500 Bandar Sunway, Selangor Darul Ehsan , Malaysia
| | - Edward R.T. Tiekink
- Research Centre for Crystalline Materials, School of Science and Technology, Sunway University , 47500 Bandar Sunway, Selangor Darul Ehsan , Malaysia , e-mail:
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30
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Yeo CI, Tiekink ER. Crystal structure of 1-(4-chlorophenyl)-3-[methyl(phenyl)amino]thiourea, C 14H 14ClN 3S. Z KRIST-NEW CRYST ST 2019. [DOI: 10.1515/ncrs-2019-0205] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
C14H14ClN3S, orthorhombic, Pbca (no. 61), a = 10.4000(2) Å, b = 11.5622(2) Å, c = 23.4776(4) Å, V = 2823.11(9) Å3, Z = 8, R
gt(F) = 0.0284, wR
ref(F
2) = 0.0774, T = 100(2) K.
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Affiliation(s)
- Chien Ing Yeo
- Research Centre for Crystalline Materials, School of Science and Technology , Sunway University , 47500 Bandar Sunway, Selangor Darul Ehsan , Malaysia
| | - Edward R.T. Tiekink
- Research Centre for Crystalline Materials, School of Science and Technology , Sunway University , 47500 Bandar Sunway, Selangor Darul Ehsan , Malaysia
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31
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Affiliation(s)
- Revannath L. Sutar
- Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum, 44801, Germany
| | - Stefan M. Huber
- Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum, 44801, Germany
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32
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Gesslbauer S, Savela R, Chen Y, White AJP, Romain C. Exploiting Noncovalent Interactions for Room-Temperature Heteroselective rac-Lactide Polymerization Using Aluminum Catalysts. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00875] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- S. Gesslbauer
- Department of Chemistry, Molecular Sciences Research Hub (MSRH), Imperial College London, W12 0BZ London, U.K
| | - R. Savela
- Laboratory of Organic Chemistry, Åbo Akademi University, FI-20500 Åbo, Finland
| | - Y. Chen
- Department of Chemistry, Molecular Sciences Research Hub (MSRH), Imperial College London, W12 0BZ London, U.K
| | - A. J. P. White
- Department of Chemistry, Molecular Sciences Research Hub (MSRH), Imperial College London, W12 0BZ London, U.K
| | - C. Romain
- Department of Chemistry, Molecular Sciences Research Hub (MSRH), Imperial College London, W12 0BZ London, U.K
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33
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Kaasik M, Metsala A, Kaabel S, Kriis K, Järving I, Kanger T. Halo-1,2,3-triazolium Salts as Halogen Bond Donors for the Activation of Imines in Dihydropyridinone Synthesis. J Org Chem 2019; 84:4294-4303. [DOI: 10.1021/acs.joc.9b00248] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Mikk Kaasik
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn 12618, Estonia
| | - Andrus Metsala
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn 12618, Estonia
| | - Sandra Kaabel
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn 12618, Estonia
| | - Kadri Kriis
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn 12618, Estonia
| | - Ivar Järving
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn 12618, Estonia
| | - Tõnis Kanger
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn 12618, Estonia
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34
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Abstract
The title compound, 1-[N-methyl-N-(phenyl)amino]-3-(4-methylphenyl)thiourea (1), was synthesized by the reaction of 1-methyl-1-phenyl hydrazine and 4-tolyl isothiocyanate, and was characterized by spectroscopy (1H and 13C{1H} NMR, IR, and UV), elemental analysis as well as by single crystal X-ray crystallography. In the solid state, the molecule exists as the thioamide tautomer and features an anti-disposition of the thioamide–N–H atoms; an intramolecular N–H⋯N hydrogen bond is noted. The molecular conformation resembles that of the letter L. In the molecular packing, thioamide-N1–H⋯S1(thione) hydrogen bonds lead to centrosymmetric eight-membered {⋯HNCS}2 synthons. The dimers are assembled into a supramolecular layer in the bc-plane by phenyl- and methyl-C–H⋯π(phenyl) interactions.
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35
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Wåhlander J, Amedjkouh M, Balcells D. A DFT Perspective on Diels–Alder Organocatalysts Based on Substituted Phosphoramides. European J Org Chem 2019. [DOI: 10.1002/ejoc.201800844] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jakob Wåhlander
- Department of Chemistry University of Oslo P.O. Box 1033 0315 Blindern, Oslo Norway
| | - Mohamed Amedjkouh
- Department of Chemistry University of Oslo P.O. Box 1033 0315 Blindern, Oslo Norway
| | - David Balcells
- Hylleraas Centre for Quantum Molecular Sciences Department of Chemistry University of Oslo P.O. Box 1033 0315 Blindern, Oslo Norway
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36
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Odagi M, Araki H, Min C, Yamamoto E, Emge TJ, Yamanaka M, Seidel D. Insights into the Structure and Function of a Chiral Conjugate‐Base‐Stabilized Brønsted Acid Catalyst. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801024] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Minami Odagi
- Center for Heterocyclic Compounds Department of Chemistry University of Florida 32611 Gainesville Florida USA
| | - Hiroshi Araki
- Department of Chemistry and Chemical Biology of Rutgers The State University of New Jersey 08854 Piscataway NJ USA
| | - Chang Min
- Department of Chemistry and Chemical Biology of Rutgers The State University of New Jersey 08854 Piscataway NJ USA
| | - Eri Yamamoto
- Department of Chemistry Faculty of Science Rikkyo University 3‐34‐1 Nishi‐Ikebukuro 171‐8501 Toshima‐ku Tokyo Japan
| | - Thomas J. Emge
- Department of Chemistry and Chemical Biology of Rutgers The State University of New Jersey 08854 Piscataway NJ USA
| | - Masahiro Yamanaka
- Department of Chemistry Faculty of Science Rikkyo University 3‐34‐1 Nishi‐Ikebukuro 171‐8501 Toshima‐ku Tokyo Japan
| | - Daniel Seidel
- Center for Heterocyclic Compounds Department of Chemistry University of Florida 32611 Gainesville Florida USA
- Department of Chemistry and Chemical Biology of Rutgers The State University of New Jersey 08854 Piscataway NJ USA
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37
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Owolabi IA, Subba Reddy U, Chennapuram M, Seki C, Okuyama Y, Kwon E, Uwai K, Tokiwa M, Takeshita M, Nakano H. A new type of amino amide organocatalyzed enantioselective crossed aldol reaction of ketones with aromatic aldehydes. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.07.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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38
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Dajek M, Kowalczyk R, Boratyński PJ. trans-1,2-Diaminocyclohexane-based sulfonamides as effective hydrogen-bonding organocatalysts for asymmetric Michael–hemiacetalization reaction. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01199k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Simple sulfonamide organocatalysts deliver unparalleled efficiency in the asymmetric Michael–hemiacetalization cascade.
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Affiliation(s)
- Maciej Dajek
- Department of Organic Chemistry
- Wrocław University of Technology
- Wrocław
- 50-370 Poland
| | - Rafał Kowalczyk
- Department of Organic Chemistry
- Wrocław University of Technology
- Wrocław
- 50-370 Poland
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