1
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Oiarbide M, Palomo C. Brønsted Base-Catalyzed Enantioselective α-Functionalization of Carbonyl Compounds Involving π-Extended Enolates. CHEM REC 2023; 23:e202300164. [PMID: 37350363 DOI: 10.1002/tcr.202300164] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 06/06/2023] [Indexed: 06/24/2023]
Abstract
Chiral Brønsted base (BB) catalyzed asymmetric transformations constitute an important tool for synthesis. A meaningful fraction of these transformations proceeds through transiently generated enolate intermediates, which display quite versatile reactivity against a variety of electrophiles. Some years ago, our group became interested in developing BB-catalyzed asymmetric reactions of enolizable carbonyl substrates that involve π-extended enolates in which, besides control of reaction diastereo and enantioselectivity, the site-selectivity control is an additional issue in most cases. In the examples covered in this account the opportunities deployed, and the challenges posed, by these methods are illustrated, with a focus on the generation of quaternary carbon stereocenters. In the way, new bifunctional BB catalysts as well as achiral templates were developed that may find further applications.
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Affiliation(s)
- Mikel Oiarbide
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018 San Sebastián, Spain
| | - Claudio Palomo
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018 San Sebastián, Spain
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2
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Pál D, Besnard C, de Aguirre A, Poblador-Bahamonde AI, Pescitelli G, Lacour J. 2,4,5,7-Tetranitrofluorenone Oximate for the Naked-Eye Detection of H-Bond Donors and the Chiroptical Sensing of Enantiopure Reagents. Chemistry 2023; 29:e202302169. [PMID: 37529861 DOI: 10.1002/chem.202302169] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 08/03/2023]
Abstract
Hydrogen bonding greatly influences rates and equilibrium positions of chemical reactions, conformations, and sometimes even stereochemistry. This study reports on tetranitrofluorenone oximate, a novel dye capable of naked-eye detection of hydrogen-bond donating species (HBDs) and of rapid determination of H-bond donation strength by hypsochromic shift monitoring. In addition, the molecule possesses atropisomeric conformations, of M and P configuration, as evidenced in solid and solution state studies by X-ray diffraction and electronic circular dichroism (ECD), respectively. In the latter case, enantiopure bis-thioureas were the most effective HBDs to promote a chiral induction (diastereoselective recognition, Pfeiffer effect); the ECD results being rationalized by time-dependent density functional theory (TDDFT) calculations. Based on these experiments, bis-thioureas were used as chiral reagents in asymmetric 1,3-dipolar cycloadditions of structurally-related nitrones; the ECD sensing of the stereoinduction between bis-thioureas and the oximate serving as an indirect method of selection of the most effective HBD for asymmetric synthesis.
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Affiliation(s)
- Dávid Pál
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211, Geneva 4, Switzerland
| | - Céline Besnard
- Laboratory of Crystallography, University of Geneva, Quai Ernest Ansermet Genève, 24, 1211, Geneva 4, Switzerland
| | - Adiran de Aguirre
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211, Geneva 4, Switzerland
| | | | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, University of Pisa, Via G. Moruzzi 13, 56124, Pisa, Italy
| | - Jérôme Lacour
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211, Geneva 4, Switzerland
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3
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Hou Y, Zhu S, Chen Y, Yu M, Liu Y, Li M. Evaluation of Antibacterial Activity of Thiourea Derivative TD4 against Methicillin-Resistant Staphylococcus aureus via Destroying the NAD+/NADH Homeostasis. Molecules 2023; 28:molecules28073219. [PMID: 37049981 PMCID: PMC10096324 DOI: 10.3390/molecules28073219] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 03/31/2023] [Accepted: 03/31/2023] [Indexed: 04/14/2023] Open
Abstract
To develop effective agents to combat bacterial infections, a series of thiourea derivatives (TDs) were prepared and their antibacterial activities were evaluated. Our results showed that TD4 exerted the most potent antibacterial activity against a number of Staphylococcus aureus (S. aureus), including the methicillin-resistant Staphylococcus aureus (MRSA), Staphylococcus epidermidis and Enterococcus faecalis strains, with the minimum inhibitory concentration (MIC) at 2-16 µg/mL. It inhibited the MRSA growth curve in a dose-dependent manner and reduced the colony formation unit in 4× MIC within 4 h. Under the transmission electron microscope, TD4 disrupted the integrity of MRSA cell wall. Additionally, it reduced the infective lesion size and the bacterial number in the MRSA-induced infection tissue of mice and possessed a good drug likeness according to the Lipinski rules. Our results indicate that TD4 is a potential lead compound for the development of novel antibacterial agent against the MRSA infection.
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Affiliation(s)
- Yachen Hou
- College of Life Sciences, Northwest University, Xi'an 710069, China
- Department of Pharmacology, School of Pharmacy, Air Force Medical University, Xi'an 710032, China
| | - Sikai Zhu
- Department of Medicinal Chemistry and Pharmaceutical Analysis, School of Pharmacy, Air Force Medical University, Xi'an 710032, China
| | - Yamiao Chen
- College of Life Sciences, Northwest University, Xi'an 710069, China
- Department of Pharmacology, School of Pharmacy, Air Force Medical University, Xi'an 710032, China
| | - Moxi Yu
- Department of Pharmacology, School of Pharmacy, Air Force Medical University, Xi'an 710032, China
| | - Yongsheng Liu
- Department of Pharmacology, School of Pharmacy, Air Force Medical University, Xi'an 710032, China
| | - Mingkai Li
- Department of Pharmacology, School of Pharmacy, Air Force Medical University, Xi'an 710032, China
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4
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Norman NJ, Bao ST, Curts L, Hui T, Zheng SL, Shou T, Zeghibe A, Burdick I, Fuehrer H, Huang A. Highly Selective N-Alkylation of Pyrazoles: Crystal Structure Evidence for Attractive Interactions. J Org Chem 2022; 87:10018-10025. [PMID: 35877958 DOI: 10.1021/acs.joc.2c00980] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Inspired by crystal structures, we designed and achieved a catalyst-free Michael reaction for the preparation of an N1-alkyl pyrazole in a high yield (>90%) with excellent regioselectivity (N1/N2 > 99.9:1). The scope of this protocol has been extended to accomplish the first general regioselective N1-alkylation of 1H-pyrazoles to give di-, tri-, and tetra-substituted pyrazoles in a single step. The resulting pyrazoles bear versatile functional groups such as bromo, ester, nitro, and nitrile, offering opportunities for late-stage functionalization. This efficient methodology will have an impact on drug discovery, as several Food and Drug Administration-approved drugs are pyrazole derivatives. A working hypothesis for the regioselectivity is proposed. X-ray crystal structures of the products that highlight the attractive interactions are discussed. This report provides a rare source for the further elucidation of the attractive interactions because the isomeric ratios and the crystal structures are directly related.
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Affiliation(s)
- Natalie J Norman
- Department of Chemistry, Wellesley College, 106 Central Street, Wellesley, Massachusetts 02481, United States
| | - Si Tong Bao
- Department of Chemistry, Wellesley College, 106 Central Street, Wellesley, Massachusetts 02481, United States
| | - Lynne Curts
- Department of Chemistry, Wellesley College, 106 Central Street, Wellesley, Massachusetts 02481, United States
| | - Tiffani Hui
- Department of Chemistry, Wellesley College, 106 Central Street, Wellesley, Massachusetts 02481, United States
| | - Shao-Liang Zheng
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford St., Bauer B06, Cambridge, Massachusetts 02138, United States
| | - Tiffany Shou
- Department of Chemistry, Wellesley College, 106 Central Street, Wellesley, Massachusetts 02481, United States
| | - Ana Zeghibe
- Department of Chemistry, Wellesley College, 106 Central Street, Wellesley, Massachusetts 02481, United States
| | - Izzy Burdick
- Department of Chemistry, Wellesley College, 106 Central Street, Wellesley, Massachusetts 02481, United States
| | - Hannah Fuehrer
- Department of Chemistry, Wellesley College, 106 Central Street, Wellesley, Massachusetts 02481, United States
| | - Adrian Huang
- Department of Chemistry, Wellesley College, 106 Central Street, Wellesley, Massachusetts 02481, United States
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5
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Asymmetric Phase Transfer Catalysed Michael Addition of γ-Butenolide and N-Boc-Pyrrolidone to 4-Nitro-5-styrylisoxazoles. Catalysts 2022. [DOI: 10.3390/catal12060634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/10/2022] Open
Abstract
Herein we report the addition of acidic γ-butenolide and N-Boc-pyrrolidone to 4-nitro-5-styrylisoxazoles, a popular class of cinnamic ester synthetic equivalent. The reactions proceeded under the catalysis of Cinchona-based phase-transfer catalysts. Functionalised γ-butenolides were obtained in good isolated yields and moderate enantioselectivity (up to 74% ee).
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6
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Momo PB, Mizobuchi EF, Echemendía R, Baddeley I, Grayson MN, Burtoloso ACB. Organocatalytic Enantioselective Sulfa-Michael Additions to α,β-Unsaturated Diazoketones. J Org Chem 2022; 87:3482-3490. [PMID: 35179890 DOI: 10.1021/acs.joc.1c03045] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Enantioselective sulfa-Michael additions to α,β unsaturated diazocarbonyl compounds have been developed. Quinine-derived squaramide was found to be the best catalyst to promote C-S bond formation in a highly stereoselective fashion for alkyl and aryl thiols. The easy-to-follow protocol allowed the preparation of 22 examples in enantiomeric ratios up to 97:3 and reaction yields up to 94%. The mechanism and origins of enantioselectivity were determined through density functional theory (DFT) calculations.
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Affiliation(s)
- Patricia B Momo
- Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo CEP 13560-970, Brazil
| | - Eduardo F Mizobuchi
- Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo CEP 13560-970, Brazil
| | - Radell Echemendía
- Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo CEP 13560-970, Brazil
| | - Isabel Baddeley
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Matthew N Grayson
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Antonio C B Burtoloso
- Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo CEP 13560-970, Brazil
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7
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Lee J, Ban JW, Kim J, Yang S, Lee G, Dhorma LP, Kim MH, Ha MW, Hong S, Park HG. Asymmetric Phase-Transfer Catalytic aza-Michael Addition to Cyclic Enone: Highly Enantioselective and Diastereoselective Synthesis of Cyclic 1,3-Aminoalcohols. Org Lett 2022; 24:1647-1651. [PMID: 35175781 DOI: 10.1021/acs.orglett.2c00192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The highly enantioselective aza-Michael reaction of tert-butyl β-naphthylmethoxycarbamate to cyclic enones has been accomplished by using a new cinchona alkaloid derived C(9)-urea ammonium catalyst under phase-transfer catalysis conditions with up to 98% ee at 0 °C. The resulting aza-Michael adducts can be converted to versatile intermediates by selective deprotection and the cyclic 1,3-aminoalcohols by diastereoselective reduction with up to 32:1, which have been widely used as important pharmacophores in pharmaceutical development.
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Affiliation(s)
- Jaeyong Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jeong Woo Ban
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jeongseok Kim
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Sehun Yang
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Geumwoo Lee
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Lama Prema Dhorma
- College of Pharmacy, Gachon University, 191 Hambakmoero, Yeonsu-gu, Incheon 21936, Republic of Korea
| | - Mi-Hyun Kim
- College of Pharmacy, Gachon University, 191 Hambakmoero, Yeonsu-gu, Incheon 21936, Republic of Korea
| | - Min Woo Ha
- Jeju Research Institute of Pharmaceutical Sciences, College of Pharmacy and Interdisciplinary Graduate Program in Advanced Convergence Technology & Science, Jeju National University, 102 Jejudaehak-ro, Jeju 63243, Republic of Korea
| | - Suckchang Hong
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hyeung-Geun Park
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
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8
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Liu Y, Zhao G, Wu W, Wang Y, Yu Y, You J, Liu B. Study on Asymmetric Conjugate Cyanation of 3,5-Dimethyl-N-α,β-unsaturated Acylpyrazole Catalyzed by Magnesium-Bisoxazoline Complex. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202107061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Larionov VA, Feringa BL, Belokon YN. Enantioselective "organocatalysis in disguise" by the ligand sphere of chiral metal-templated complexes. Chem Soc Rev 2021; 50:9715-9740. [PMID: 34259242 DOI: 10.1039/d0cs00806k] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Asymmetric catalysis holds a prominent position among the important developments in chemistry during the 20th century. This was acknowledged by the 2001 Nobel Prize in chemistry awarded to Knowles, Noyori, and Sharpless for their development of chiral metal catalysts for organic transformations. The key feature of the catalysts was the crucial role of the chiral ligand and the nature of the metal ions, which promoted the catalytic conversions of the substrates via direct coordination. Subsequently the development of asymmetric organic catalysis opened new avenues to the synthesis of enantiopure compounds, avoiding any use of metal ions. Recently, an alternative approach to asymmetric catalysis emerged that relied on the catalytic functions of the ligands themselves boosted by coordination to metal ions. In other words, in these hybrid chiral catalysts the substrates are activated not by the metal ions but by the ligands. The activation and enantioselective control occurred via well-orchestrated and custom-tailored non-covalent interactions of the substrates with the ligand sphere of chiral metal complexes. In these metal-templated catalysts, the metal served either as a template (a purely structural role), or it constituted the exclusive source of chirality (metal-centred chirality due to the spatial arrangement of achiral or chiral bi-/tridentate ligands around an octahedral metal centre), and/or it increased the Brønsted acidity of the ligands. Although the field is still in its infancy, it represents an inspiring combination of both metal and organic catalysis and holds major unexplored potential to push the frontiers of asymmetric catalysis. Here we present an overview of this emerging field discussing the principles, applications and perspectives on the catalytic use of chiral metal complexes that operate as "organocatalysts in disguise". It has been demonstrated that these chiral metal complexes are efficient and provide high stereoselective control in asymmetric hydrogen bonding catalysis, phase-transfer catalysis, Brønsted acid/base catalysis, enamine catalysis, nucleophilic catalysis, and photocatalysis as well as bifunctional catalysis. Also, many of the catalysts have been identified as highly effective catalysts at remarkably low catalyst loadings. These hybrid systems offer many opportunities in the synthesis of chiral compounds and represent promising alternatives to metal-based and organocatalytic asymmetric transformations.
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Affiliation(s)
- Vladimir A Larionov
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilov Street 28, 119991 Moscow, Russian Federation.
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10
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Itoh K, Nagao SI, Tokunaga K, Hirayama S, Karaki F, Mizuguchi T, Nagai K, Sato N, Suzuki M, Hashimoto M, Fujii H. Visible-Light-Induced Synthesis of 1,2,3,4-Tetrahydroquinolines through Formal [4+2] Cycloaddition of Acyclic α,β-Unsaturated Amides and Imides with N,N-Dialkylanilines. Chemistry 2021; 27:5171-5179. [PMID: 33300620 DOI: 10.1002/chem.202004186] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 12/05/2020] [Indexed: 01/01/2023]
Abstract
1,2,3,4-Tetrahydroquinolines should be applicable to the development of new pharmaceutical agents. A facile synthesis of 1,2,3,4-tetrahydroquinolines that is achieved by a photoinduced formal [4+2] cycloaddition reaction of acyclic α,β-unsaturated amides and imides with N,N-dialkylanilines under visible-light irradiation, in which a new IrIII complex photosensitizer, a thiourea, and an oxidant act cooperatively in promoting the reaction, is reported. The photoreaction enables the synthesis of a wide variety of 1,2,3,4-tetrahydroquinolines, while controlling the trans/cis diastereoselectivity (>99:1) and constructing contiguous stereogenic centers. A chemoselective cleavage of an acyclic imide auxiliary is demonstrated.
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Affiliation(s)
- Kennosuke Itoh
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan.,Medicinal Research Laboratories, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan
| | - Shun-Ichi Nagao
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan
| | - Ken Tokunaga
- Division of Liberal Arts, Center for Promotion of Higher Education, Kogakuin University, Tokyo, 192-0015, Japan
| | - Shigeto Hirayama
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan.,Medicinal Research Laboratories, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan
| | - Fumika Karaki
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan.,Medicinal Research Laboratories, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan
| | - Takaaki Mizuguchi
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan.,Medicinal Research Laboratories, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan
| | - Kenichiro Nagai
- Medicinal Research Laboratories, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan
| | - Noriko Sato
- Medicinal Research Laboratories, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan
| | - Mitsuaki Suzuki
- Department of Chemistry, Faculty of Science, Josai University, Saitama, 350-0295, Japan
| | - Masashi Hashimoto
- Department of Chemistry, Faculty of Science, Josai University, Saitama, 350-0295, Japan
| | - Hideaki Fujii
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan.,Medicinal Research Laboratories, School of Pharmacy, Kitasato University, Tokyo, 108-8641, Japan
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11
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Hayama N. [Asymmetric Hetero-Michael Additions to α,β-Unsaturated Carboxylic Acids by Multifunctional Boronic Acid Catalysts]. YAKUGAKU ZASSHI 2021; 141:293-301. [PMID: 33642494 DOI: 10.1248/yakushi.20-00214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Several direct asymmetric Michael additions to α,β-unsaturated carboxylic acids with integrated catalysts comprising chiral bifunctional thiourea and arylboronic acid were developed. First, the asymmetric aza-Michael addition of hydroxylamine derivatives efficiently afforded a variety of optically active β-amino acid derivatives. Furthermore, upon detailed investigation of the reaction, tetrahedral borate complexes, comprising two carboxylate molecules, were found to serve as reaction intermediates. Based on this observation, a drastic improvement in product enantioselectivity was achieved upon benzoic acid addition. Second, on merely changing the solvent, the asymmetric thia-Michael addition of arylthiols afforded both enantiomers of the adducts, which are important building blocks for biologically active compounds.
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Affiliation(s)
- Noboru Hayama
- School of Pharmaceutical Sciences, Mukogawa Women's University
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12
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Hayama N, Kobayashi Y, Takemoto Y. Asymmetric hetero-Michael addition to α,β-unsaturated carboxylic acids using thiourea–boronic acid hybrid catalysts. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132089] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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13
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Curran SP, Fallon BJ, Connon SJ. C
2
‐Symmetric Cinchona Alkaloid Derivatives: Versatile Catalysts for the Enantioselective C−C Bond Forming Conjugate Addition of Nucleophiles to Simple α,β‐Unsaturated Acyl Pyrazoles. ChemistrySelect 2020. [DOI: 10.1002/slct.202004505] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Simon P. Curran
- School of Chemistry Trinity Biomedical Sciences Institute Trinity College Dublin 152-160 Pearse Street 2 Dublin Ireland
| | - Brendan J. Fallon
- School of Chemistry Trinity Biomedical Sciences Institute Trinity College Dublin 152-160 Pearse Street 2 Dublin Ireland
| | - Stephen J. Connon
- School of Chemistry Trinity Biomedical Sciences Institute Trinity College Dublin 152-160 Pearse Street 2 Dublin Ireland
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14
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Ishihara K, Nishimura K, Yamakawa K. Enantio- and Site-Selective α-Fluorination of N-Acyl 3,5-Dimethylpyrazoles Catalyzed by Chiral π-Cu II Complexes. Angew Chem Int Ed Engl 2020; 59:17641-17647. [PMID: 32633892 DOI: 10.1002/anie.202007403] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Indexed: 11/11/2022]
Abstract
Catalytic enantioselective α-fluorination reactions of carbonyl compounds are among the most powerful and efficient synthetic methods for constructing optically active α-fluorinated carbonyl compounds. Nevertheless, α-fluorination of α-nonbranched carboxylic acid derivatives is still a big challenge because of relatively high pKa values of their α-hydrogen atoms and difficulty of subsequent synthetic transformation without epimerization. Herein we show that chiral copper(II) complexes of 3-(2-naphthyl)-l-alanine-derived amides are highly effective catalysts for the enantio- and site-selective α-fluorination of N-(α-arylacetyl) and N-(α-alkylacetyl) 3,5-dimethylpyrazoles. The substrate scope of the transformation is very broad (25 examples including a quaternary α-fluorinated α-amino acid derivative). α-Fluorinated products were converted into the corresponding esters, secondary amides, tertiary amides, ketones, and alcohols with almost no epimerization in high yield.
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Affiliation(s)
- Kazuaki Ishihara
- Graduate School of Engineering, Nagoya University, B2-3(611), Furo-cho, Chikusa, Nagoya, 464-8603, Japan
| | - Kazuki Nishimura
- Graduate School of Engineering, Nagoya University, B2-3(611), Furo-cho, Chikusa, Nagoya, 464-8603, Japan
| | - Katsuya Yamakawa
- Graduate School of Engineering, Nagoya University, B2-3(611), Furo-cho, Chikusa, Nagoya, 464-8603, Japan
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15
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Ishihara K, Nishimura K, Yamakawa K. Enantio‐ and Site‐Selective α‐Fluorination of
N
‐Acyl 3,5‐Dimethylpyrazoles Catalyzed by Chiral π–Cu
II
Complexes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007403] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kazuaki Ishihara
- Graduate School of Engineering Nagoya University B2-3(611), Furo-cho Chikusa Nagoya 464-8603 Japan
| | - Kazuki Nishimura
- Graduate School of Engineering Nagoya University B2-3(611), Furo-cho Chikusa Nagoya 464-8603 Japan
| | - Katsuya Yamakawa
- Graduate School of Engineering Nagoya University B2-3(611), Furo-cho Chikusa Nagoya 464-8603 Japan
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16
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Wu Q, Gong W, Li G. Porous Organic Polymers with Thiourea Linkages (POP-TUs): Effective and Recyclable Organocatalysts for the Michael Reaction. ACS APPLIED MATERIALS & INTERFACES 2020; 12:17861-17869. [PMID: 32208633 DOI: 10.1021/acsami.0c01280] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
As novel porous organic polymers with thiourea linkages, POP-TUs were successfully synthesized with tris(4-aminophenyl) amine (TAA) and 1,4-phenylene diisothiocyanate (PDT) under different conditions. The as-synthesized POP-TUs possess distinctly different morphological characteristics and can effectively catalyze the Michael reaction of trans-β-nitrostyrenes to diethyl malonate. Particularly, the POP-TU-2-catalyzed Michael reaction can proceed smoothly even using an ultralow catalyst dosage of 0.03 mol %, whose turnover number (TON) and turnover frequency (TOF) can reach up to 2700 and 25 h-1, respectively. Besides, POP-TU-2 also exhibits excellent recyclability and reusability. Only 2% decline in the isolated yield was found after five consecutive runs. This work shows a significant improvement over previously reported thiourea-based catalysts and can offer an effective strategy for developing highly efficient heterogeneous organocatalysts.
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Affiliation(s)
- Qianqian Wu
- Department of Polymer Science and Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Wei Gong
- Department of Polymer Science and Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Guangji Li
- Department of Polymer Science and Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China
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17
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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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18
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Lei CW, Zhang CB, Wang ZH, Xie KX, Zhao JQ, Zhou MQ, Zhang XM, Xu XY, Yuan WC. Coumarin-3-formylpyrazoles as 3-carbon synthons in cyclocondensation for the synthesis of spiro-fused pentacyclic spirooxindoles. Org Biomol Chem 2020; 18:845-850. [PMID: 31932837 DOI: 10.1039/c9ob02434d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Coumarin-3-formylpyrazoles have been synthesized and applied as 3-carbon synthons in reaction with 3-hydroxyoxindoles by using DABCO as the catalyst. A range of structurally diverse spiro-fused pentacyclic spirooxindoles, bearing a spirooxindole-γ-lactone and a 3,4-dihydrocoumarin substructure, could be smoothly obtained in good to excellent yields (up to 99%) with excellent diastereoselectivities (all cases >20 : 1 dr). The asymmetric version of this tandem reaction was preliminarily investigated by using chiral organocatalysts.
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Affiliation(s)
- Chuan-Wen Lei
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China. and University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chuan-Bao Zhang
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China. and University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhen-Hua Wang
- Institute for Advanced Study, Chengdu University, Chengdu, 610106, China.
| | - Ke-Xin Xie
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Jian-Qiang Zhao
- Institute for Advanced Study, Chengdu University, Chengdu, 610106, China.
| | - Ming-Qiang Zhou
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China.
| | - Xiao-Mei Zhang
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China.
| | - Xiao-Ying Xu
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China.
| | - Wei-Cheng Yuan
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China. and Institute for Advanced Study, Chengdu University, Chengdu, 610106, China.
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19
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Hajra S, Laskar S, Jana B. Organocatalytic Enantioselective Mukaiyama-Mannich Reaction of Isatin-Derived Ketimines for the Synthesis of Oxindolyl-β 3, 3 -Amino Acid Esters. Chemistry 2019; 25:14688-14693. [PMID: 31479157 DOI: 10.1002/chem.201903512] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Indexed: 12/18/2022]
Abstract
Mukaiyama-Mannich reactions of ester enolate equivalents with aldimines have been elegantly used for the asymmetric synthesis of β-amino acids; nevertheless, the corresponding asymmetric reaction employing ketimines are unexplored. Herein, the first organocatalytic enantioselective Mukaiyama-Mannich reaction employing isatin-derived ketimines with unsubstituted silyl ketene acetals is disclosed towards the scalable synthesis of 2-oxoindolinyl-β3, 3 -amino acid esters at room temperature with excellent enantioselectivities (ee >99.5 %). Ultra-low catalyst loadings (as low as 250 ppm) could be used for the quantitative product formation with high enantiopurity. The synthetic utility of this protocol has been showcased in the short formal synthesis of pharmaceutically demanded (+)-AG-041R, a potent gastrin/CCK-B receptor antagonist.
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Affiliation(s)
- Saumen Hajra
- Centre of Biomedical Research, Sanjay Gandhi Post-Graduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow, 226014, India
| | - Sujay Laskar
- Centre of Biomedical Research, Sanjay Gandhi Post-Graduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow, 226014, India
| | - Bibekananda Jana
- Centre of Biomedical Research, Sanjay Gandhi Post-Graduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow, 226014, India.,Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
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20
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Shu C, Liu H, Slawin AMZ, Carpenter-Warren C, Smith AD. Isothiourea-catalysed enantioselective Michael addition of N-heterocyclic pronucleophiles to α,β-unsaturated aryl esters. Chem Sci 2019; 11:241-247. [PMID: 34040717 PMCID: PMC8133005 DOI: 10.1039/c9sc04303a] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The isothiourea-catalysed enantioselective Michael addition of 3-aryloxindole and 4-substituted-dihydropyrazol-3-one pronucleophiles to α,β-unsaturated p-nitrophenyl esters is reported. This process generates products containing two contiguous stereocentres, one quaternary, in good yields and excellent enantioselectivities (>30 examples, up to > 95 : 5 dr and 99 : 1 er). This protocol harnesses the multifunctional ability of p-nitrophenoxide to promote effective catalysis. In contrast to previous methodologies using tertiary amine Lewis bases, in which the pronucleophile was used as the solvent, this work allows bespoke pronucleophiles to be used in stoichiometric quantities. The isothiourea-catalysed enantioselective Michael addition of 3-aryloxindole and 4-substituted-dihydropyrazol-3-one pronucleophiles to α,β-unsaturated p-nitrophenyl esters is reported.![]()
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Affiliation(s)
- Chang Shu
- EaStCHEM, School of Chemistry, University of St Andrews North Haugh, St Andrews Fife KY16 9ST UK
| | - Honglei Liu
- EaStCHEM, School of Chemistry, University of St Andrews North Haugh, St Andrews Fife KY16 9ST UK
| | - Alexandra M Z Slawin
- EaStCHEM, School of Chemistry, University of St Andrews North Haugh, St Andrews Fife KY16 9ST UK
| | - Cameron Carpenter-Warren
- EaStCHEM, School of Chemistry, University of St Andrews North Haugh, St Andrews Fife KY16 9ST UK
| | - Andrew D Smith
- EaStCHEM, School of Chemistry, University of St Andrews North Haugh, St Andrews Fife KY16 9ST UK
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21
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Xian J, Chen L, Ye L, Sun Y, Shi Z, Zhao Z, Li X. Enantioselective synthesis of fused dihydropyranones via squaramide-catalyzed Michael addition/lactonization cascade reaction. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.03.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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22
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Itoh K, Sibi MP. Dibenzofuran-4,6-bis(oxazoline) (DBFOX). A novel trans-chelating bis(oxazoline) ligand for asymmetric reactions. Org Biomol Chem 2019; 16:5551-5565. [PMID: 29947634 DOI: 10.1039/c8ob01010b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The trans-chelating bis(oxazoline) ligand (R,R)-4,6-dibenzofurandiyl-2,2'-bis(4-phenyloxazoline) [(R,R)-DBFOX/Ph] coordinates metal ions to give C2-symmetric complexes which effectively catalyze a variety of asymmetric reactions. (R,R)-DBFOX/Ph·Ni(ClO4)2·3H2O, whose crystal structure is octahedral with three aqua ligands, can be stored under air for several months without loss of catalytic activity and promotes highly enantioselective reactions even in the presence of excess amounts of water, alcohols, amines, and acids. The complex shows remarkable chiral amplification in asymmetric Diels-Alder (DA) reactions. This review focuses on enantioselective reactions catalyzed by (R,R)-DBFOX/Ph·metal complexes.
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Affiliation(s)
- Kennosuke Itoh
- Laboratory of Medicinal Chemistry, School of Pharmacy, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo, Japan.
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23
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Michigami K, Murakami H, Nakamura T, Hayama N, Takemoto Y. Catalytic asymmetric aza-Michael addition of fumaric monoacids with multifunctional thiourea/boronic acids. Org Biomol Chem 2019; 17:2331-2335. [DOI: 10.1039/c9ob00045c] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Chiral multifunctional thiourea/boronic acid catalysts enabled the synthesis of N-hydroxyaspartate derivatives applicable for KAHA amidation through acid-β selective aza-Michael addition.
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Affiliation(s)
- Kenichi Michigami
- Graduate School of Pharmaceutical Sciences
- Kyoto University
- Kyoto 606-8501
- Japan
| | - Hiroki Murakami
- Graduate School of Pharmaceutical Sciences
- Kyoto University
- Kyoto 606-8501
- Japan
| | - Takeru Nakamura
- Graduate School of Pharmaceutical Sciences
- Kyoto University
- Kyoto 606-8501
- Japan
| | - Noboru Hayama
- Graduate School of Pharmaceutical Sciences
- Kyoto University
- Kyoto 606-8501
- Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences
- Kyoto University
- Kyoto 606-8501
- Japan
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24
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Liu Y, Ye L, Shi Z, Yang X, Zhao Z, Li X. Highly enantioselective Michael addition of α-nitroacetate to α,β-unsaturated pyrazolamide catalyzed by a bifunctional squaramide. Chirality 2018; 30:1287-1303. [PMID: 30286255 DOI: 10.1002/chir.23023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 05/20/2018] [Accepted: 08/30/2018] [Indexed: 01/03/2023]
Abstract
A highly enantioselective (91- > 99% ee) Michael addition of α-nitroacetate to α,β-unsaturated pyrazolamide was developed in the presence of a bifunctional squaramide. Satisfactory isolated yields (42%-99%) have been achieved with a wide range of α,β-unsaturated pyrazolamides, albeit acceptor of this type displayed poor reactivity in the precedent reports. The adducts resulting from this protocol are useful synthetic intermediates for further synthetic modification.
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Affiliation(s)
- Yingying Liu
- College of Chemistry and Environment Protection Engineering, Southwest Minzu University, Chengdu, China
| | - Ling Ye
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, China
| | - Zhichuan Shi
- College of Chemistry and Environment Protection Engineering, Southwest Minzu University, Chengdu, China
| | - Xuejun Yang
- College of Chemistry and Environment Protection Engineering, Southwest Minzu University, Chengdu, China
| | - Zhigang Zhao
- College of Chemistry and Environment Protection Engineering, Southwest Minzu University, Chengdu, China
| | - Xuefeng Li
- College of Chemistry and Environment Protection Engineering, Southwest Minzu University, Chengdu, China
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25
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Hayama N, Kuramoto R, Földes T, Nishibayashi K, Kobayashi Y, Pápai I, Takemoto Y. Mechanistic Insight into Asymmetric Hetero-Michael Addition of α,β-Unsaturated Carboxylic Acids Catalyzed by Multifunctional Thioureas. J Am Chem Soc 2018; 140:12216-12225. [PMID: 30215516 DOI: 10.1021/jacs.8b07511] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Carboxylic acids and their corresponding carboxylate anions are generally utilized as Brønsted acids/bases and oxygen nucleophiles in organic synthesis. However, a few asymmetric reactions have used carboxylic acids as electrophiles. Although chiral thioureas bearing both arylboronic acid and tertiary amine were found to promote the aza-Michael addition of BnONH2 to α,β-unsaturated carboxylic acids with moderate to good enantioselectivities, the reaction mechanism remains to be clarified. Detailed investigation of the reaction using spectroscopic analysis and kinetic studies identified tetrahedral borate complexes, comprising two carboxylate anions, as reaction intermediates. We realized a dramatic improvement in product enantioselectivity with the addition of 1 equiv of benzoic acid. In this aza-Michael reaction, the boronic acid not only activates the carboxylate ligand as a Lewis acid, together with the thiourea NH-protons, but also functions as a Brønsted base through a benzoyloxy anion to activate the nucleophile. Moreover, molecular sieves were found to play an important role in generating the ternary borate complexes, which were crucial for obtaining high enantioselectivity as demonstrated by DFT calculations. We also designed a new thiourea catalyst for the intramolecular oxa-Michael addition to suppress another catalytic pathway via a binary borate complex using steric hindrance between the catalyst and substrate. Finally, to demonstrate the synthetic versatility of both hetero-Michael additions, we used them to accomplish the asymmetric synthesis of key intermediates in pharmaceutically important molecules, including sitagliptin and α-tocopherol.
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Affiliation(s)
- Noboru Hayama
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Ryuta Kuramoto
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Tamás Földes
- Institute of Organic Chemistry, Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar tudósok körútja 2 , H-1117 Budapest , Hungary
| | - Kazuya Nishibayashi
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Yusuke Kobayashi
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar tudósok körútja 2 , H-1117 Budapest , Hungary
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
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26
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Li P, Hu X, Dong XQ, Zhang X. Rhodium/bisphosphine-thiourea-catalyzed enantioselective hydrogenation of α,β-unsaturated N-acylpyrazoles. Chem Commun (Camb) 2018; 52:11677-11680. [PMID: 27709153 DOI: 10.1039/c6cc04987g] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We successfully extended our Rh/bisphosphine-thiourea (ZhaoPhos) catalytic system to asymmetric hydrogenation of α,β-unsaturated N-acylpyrazoles affording products with high yields and excellent enantioselectivities (up to 97% yield, 99% ee). The pyrazole moiety played an important role in providing H-bond acceptor sites, which is critical for achieving high reactivities and enantioselectivities.
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Affiliation(s)
- Pan Li
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, P. R. China. and College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, P. R. China.
| | - Xinquan Hu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, P. R. China.
| | - Xiu-Qin Dong
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, P. R. China.
| | - Xumu Zhang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, P. R. China. and Department of Chemistry, South University of Science and Technology of China, Shenzhen, 518000, P. R. China
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27
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Genc HN, Sirit A. Novel and highly efficient bifunctional calixarene thiourea derivatives as organocatalysts for enantioselective Michael reaction of nitroolefins with diketones. J INCL PHENOM MACRO 2017. [DOI: 10.1007/s10847-017-0761-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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Rubio OH, Mazo SD, Monleón LM, Simón L, Temprano ÁG, Morán JR. A cleft type receptor which combines an oxyanion hole with electrostatic interactions. Org Biomol Chem 2017; 15:4571-4578. [PMID: 28497821 DOI: 10.1039/c7ob00679a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A receptor for carboxylic acids which combines an oxyanion-hole structure with electrostatic forces has been prepared. X-ray diffraction studies have been carried out to evaluate the geometry of both the free receptor and its associated species with several carboxylic acids and many different arrangements have been discovered for the H-bond pattern in the associated species.
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Affiliation(s)
- Omayra H Rubio
- Organic Chemistry Department, University of Salamanca, Plaza de los Caídos, 1-5, E-37008, Salamanca, Spain.
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29
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Tan W, Wei J, Jiang X. Thiocarbonyl Surrogate via Combination of Sulfur and Chloroform for Thiocarbamide and Oxazolidinethione Construction. Org Lett 2017; 19:2166-2169. [PMID: 28388051 DOI: 10.1021/acs.orglett.7b00819] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
An efficient and practical thiocarbonyl surrogate via combination of sulfur and chloroform has been developed. A variety of thiocarbamides and oxazolidinethiones have been established, including chiral thiourea catalysts and chiral oxazolidinethione auxiliaries with high selectivity. Meanwhile, pesticides Diafenthiuron (an acaricide), ANTU (a rodenticide), and Chloromethiuron (an insecticide) were practically synthesized through this method in gram scale. Dicholorocarbene, as the key intermediate, was further confirmed via a carbene-trapping control experiment.
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Affiliation(s)
- Wei Tan
- Shanghai Key Laboratory of Green Chemistry and Chemical Process, School of Chemistry and Molecular Engineering, East China Normal University , 3663 North Zhongshan Road, Shanghai, 200062, P. R. China
| | - Jianpeng Wei
- Shanghai Key Laboratory of Green Chemistry and Chemical Process, School of Chemistry and Molecular Engineering, East China Normal University , 3663 North Zhongshan Road, Shanghai, 200062, P. R. China
| | - Xuefeng Jiang
- Shanghai Key Laboratory of Green Chemistry and Chemical Process, School of Chemistry and Molecular Engineering, East China Normal University , 3663 North Zhongshan Road, Shanghai, 200062, P. R. China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
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30
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TiO2 Nanoparticles Catalyzed Chemoselective Synthesis of 2-Chloroquinolinyl-4-quinolinones and their Intramolecular Cyclization through Palladium Catalyzed Sonogashira Coupling Reaction. Catal Letters 2017. [DOI: 10.1007/s10562-017-1992-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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31
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Zhang HJ, Shi CY, Zhong F, Yin L. Direct Asymmetric Vinylogous and Bisvinylogous Mannich-Type Reaction Catalyzed by a Copper(I) Complex. J Am Chem Soc 2017; 139:2196-2199. [DOI: 10.1021/jacs.6b13042] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hai-Jun Zhang
- CAS Key Laboratory of Synthetic
Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Chang-Yun Shi
- CAS Key Laboratory of Synthetic
Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Feng Zhong
- CAS Key Laboratory of Synthetic
Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Liang Yin
- CAS Key Laboratory of Synthetic
Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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32
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Deng T, Thota GK, Li Y, Kang Q. Enantioselective conjugate addition of hydroxylamines to α,β-unsaturated 2-acyl imidazoles catalyzed by a chiral-at-metal Rh(iii) complex. Org Chem Front 2017. [DOI: 10.1039/c6qo00865h] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A highly efficient chiral-at-metal Rh(iii) complex catalyzed asymmetric aza-Michael addition was developed, affordingN-protected β-amino acid derivatives with excellent enantioselectivity.
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Affiliation(s)
- Tao Deng
- Department of Chemistry
- Fuzhou University
- P. R. China
| | - Ganesh Kumar Thota
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Yi Li
- Department of Chemistry
- Fuzhou University
- P. R. China
| | - Qiang Kang
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
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33
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Wang G, Tang Y, Zhang Y, Liu X, Lin L, Feng X. Enantioselective Synthesis of N-H-Free 1,5-Benzothiazepines. Chemistry 2016; 23:554-557. [PMID: 27862459 DOI: 10.1002/chem.201605127] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Indexed: 11/10/2022]
Abstract
An enantioselective sulfa-Michael-cyclization reaction was developed for the synthesis of 1,5-benzothiazepines with versatile pharmacological activities. The reaction between 2-aminothiophenol and α,β-unsaturated pyrazoleamides gave direct access to N-H-free 1,5-benzothiazepines in the presence of a chiral N,N'-dioxide/Yb(OTf)3 complex. Excellent enantioselectivities (up to 96 % ee) and high yields (up to 99 %) were obtained for a broad range of substrates under mild reaction conditions. This method provided a facile approach to the antidepressant drug (R)-(-)-Thiazesim.
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Affiliation(s)
- Guojin Wang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China
| | - Yu Tang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China
| | - Yu Zhang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China
| | - Lili Lin
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China
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34
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Zhang Y, Liao Y, Liu X, Yao Q, Zhou Y, Lin L, Feng X. Catalytic Michael/Ring-Closure Reaction of α,β-Unsaturated Pyrazoleamides with Amidomalonates: Asymmetric Synthesis of (-)-Paroxetine. Chemistry 2016; 22:15119-15124. [PMID: 27576747 DOI: 10.1002/chem.201603056] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Indexed: 12/12/2022]
Abstract
A highly enantioselective tandem Michael/ring-closure reaction of α,β-unsaturated pyrazoleamides and amidomalonates has been accomplished in the presence of a chiral N,N'-dioxide-Yb(OTf)3 complex (Tf: trifluoromethanesulfonyl) to give various substituted chiral glutarimides with high yields and diastereo- and enantioselectivities. Moreover, this methodology could be used for gram-scale manipulation and was successfully applied to the synthesis of (-)-paroxetine. Further nonlinear and HRMS studies revealed that the real catalytically active species was a monomeric L-PMe2 -Yb3+ complex. A plausible transition state was proposed to explain the origin of the asymmetric induction.
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Affiliation(s)
- Yu Zhang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China), Fax: (+86) 28 8541 8249
| | - Yuting Liao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China), Fax: (+86) 28 8541 8249
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China), Fax: (+86) 28 8541 8249.
| | - Qian Yao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China), Fax: (+86) 28 8541 8249
| | - Yuhang Zhou
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China), Fax: (+86) 28 8541 8249
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China), Fax: (+86) 28 8541 8249
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China), Fax: (+86) 28 8541 8249.
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35
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Vallavoju N, Selvakumar S, Pemberton BC, Jockusch S, Sibi MP, Sivaguru J. Organophotocatalysis: Insights into the Mechanistic Aspects of Thiourea‐Mediated Intermolecular [2+2] Photocycloadditions. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600596] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nandini Vallavoju
- Department of Chemistry and Biochemistry North Dakota State University Fargo ND 58108-6050 USA
| | - Sermadurai Selvakumar
- Department of Chemistry and Biochemistry North Dakota State University Fargo ND 58108-6050 USA
| | - Barry C. Pemberton
- Department of Chemistry and Biochemistry North Dakota State University Fargo ND 58108-6050 USA
| | - Steffen Jockusch
- Department of Chemistry Columbia University New York NY 10025 USA
| | - Mukund P. Sibi
- Department of Chemistry and Biochemistry North Dakota State University Fargo ND 58108-6050 USA
| | - Jayaraman Sivaguru
- Department of Chemistry and Biochemistry North Dakota State University Fargo ND 58108-6050 USA
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36
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Vallavoju N, Selvakumar S, Pemberton BC, Jockusch S, Sibi MP, Sivaguru J. Organophotocatalysis: Insights into the Mechanistic Aspects of Thiourea-Mediated Intermolecular [2+2] Photocycloadditions. Angew Chem Int Ed Engl 2016; 55:5446-51. [PMID: 27005562 DOI: 10.1002/anie.201600596] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Indexed: 11/08/2022]
Abstract
Mechanistic investigations of the intermolecular [2+2] photocycloaddition of coumarin with tetramethylethylene mediated by thiourea catalysts reveal that the reaction is enabled by a combination of minimized aggregation, enhanced intersystem crossing, and altered excited-state lifetime(s). These results clarify how the excited-state reactivity can be manipulated through catalyst-substrate interactions and reveal a third mechanistic pathway for thiourea-mediated organo-photocatalysis.
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Affiliation(s)
- Nandini Vallavoju
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND, 58108-6050, USA
| | - Sermadurai Selvakumar
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND, 58108-6050, USA
| | - Barry C Pemberton
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND, 58108-6050, USA
| | - Steffen Jockusch
- Department of Chemistry, Columbia University, New York, NY, 10025, USA
| | - Mukund P Sibi
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND, 58108-6050, USA.
| | - Jayaraman Sivaguru
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND, 58108-6050, USA.
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37
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G. Sonsona I, Marqués-López E, Herrera RP. The aminoindanol core as a key scaffold in bifunctional organocatalysts. Beilstein J Org Chem 2016; 12:505-23. [PMID: 27340443 PMCID: PMC4901898 DOI: 10.3762/bjoc.12.50] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 02/16/2016] [Indexed: 12/30/2022] Open
Abstract
The 1,2-aminoindanol scaffold has been found to be very efficient, enhancing the enantioselectivity when present in organocatalysts. This may be explained by its ability to induce a bifunctional activation of the substrates involved in the reaction. Thus, it is easy to find hydrogen-bonding organocatalysts ((thio)ureas, squaramides, quinolinium thioamide, etc.) in the literature containing this favored structural core. They have been successfully employed in reactions such as Friedel-Crafts alkylation, Michael addition, Diels-Alder and aza-Henry reactions. However, the 1,2-aminoindanol core incorporated into proline derivatives has been scarcely explored. Herein, the most representative and illustrative examples are compiled and this review will be mainly focused on the cases where the aminoindanol moiety confers bifunctionality to the organocatalysts.
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Affiliation(s)
- Isaac G. Sonsona
- Laboratorio de Organocatálisis Asimétrica, Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) CSIC-Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Eugenia Marqués-López
- Laboratorio de Organocatálisis Asimétrica, Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) CSIC-Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Raquel P Herrera
- Laboratorio de Organocatálisis Asimétrica, Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) CSIC-Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain
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38
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Zheng Y, Yao Y, Ye L, Shi Z, Li X, Zhao Z, Li X. Highly enantioselective Michael addition of malononitrile to α,β-unsaturated pyrazolamides catalyzed by a bifunctional thiourea. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.12.067] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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39
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Temprano ÁG, Monleón LM, Rubio OH, Rubio LS, Pérez AB, Sanz F, Morán JR. A highly selective receptor for zwitterionic proline. Org Biomol Chem 2016; 14:1325-31. [DOI: 10.1039/c5ob02387d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Enantioselective extraction of zwitterionic proline from water to chloroform has been achieved with a chiral apolar chromane receptor.
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Affiliation(s)
- Álvaro G. Temprano
- Organic Chemistry Department
- Plaza de los Caidos 1-5
- University of Salamanca
- 37008 Salamanca
- Spain
| | - Laura M. Monleón
- Organic Chemistry Department
- Plaza de los Caidos 1-5
- University of Salamanca
- 37008 Salamanca
- Spain
| | - Omayra H. Rubio
- Organic Chemistry Department
- Plaza de los Caidos 1-5
- University of Salamanca
- 37008 Salamanca
- Spain
| | - Luis Simón Rubio
- Organic Chemistry Department
- Plaza de los Caidos 1-5
- University of Salamanca
- 37008 Salamanca
- Spain
| | - Asunción B. Pérez
- Organic Chemistry Department
- Paseo Belen no. 7
- University of Valladolid
- 47011 Valladolid
- Spain
| | - Francisca Sanz
- X-Ray Diffraction Service
- Plaza de los Caidos 1-5
- University of Salamanca
- 37008 Salamanca
- Spain
| | - Joaquín R. Morán
- Organic Chemistry Department
- Plaza de los Caidos 1-5
- University of Salamanca
- 37008 Salamanca
- Spain
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40
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Herrero FG, Rubio OH, Monleón LM, Fuentes de Arriba ÁL, Rubio LS, Morán JR. A molecular receptor for zwitterionic phenylalanine. Org Biomol Chem 2016; 14:3906-12. [DOI: 10.1039/c6ob00490c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Extraction of zwitterionic phenylalanine from water to chloroform has been achieved with a chiral apolar benzofuran receptor.
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Affiliation(s)
| | - Omayra H. Rubio
- Organic Chemistry Department
- University of Salamanca
- 37008 Salamanca
- Spain
| | - Laura M. Monleón
- Organic Chemistry Department
- University of Salamanca
- 37008 Salamanca
- Spain
| | | | - Luís Simón Rubio
- Engineering Chemistry Department
- University of Salamanca
- 37008 Salamanca
- Spain
| | - Joaquín R. Morán
- Organic Chemistry Department
- University of Salamanca
- 37008 Salamanca
- Spain
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41
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Hayama N, Azuma T, Kobayashi Y, Takemoto Y. Chiral Integrated Catalysts Composed of Bifunctional Thiourea and Arylboronic Acid: Asymmetric Aza-Michael Addition of α,β-Unsaturated Carboxylic Acids. Chem Pharm Bull (Tokyo) 2016; 64:704-17. [DOI: 10.1248/cpb.c15-00983] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Noboru Hayama
- Graduate School of Pharmaceutical Sciences, Kyoto University
| | - Takumi Azuma
- Graduate School of Pharmaceutical Sciences, Kyoto University
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42
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Xiao Q, He Q, Li J, Wang J. 1,4-Diazabicyclo[2.2.2]octane-Promoted Aminotrifluoromethylthiolation of α,β-Unsaturated Carbonyl Compounds: N-Trifluoromethylthio-4-nitrophthalimide Acts as Both the Nitrogen and SCF3 Sources. Org Lett 2015; 17:6090-3. [DOI: 10.1021/acs.orglett.5b03116] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Qing Xiao
- Department of Chemistry, South University of Science and Technology of China, Shenzhen 518055, China
| | - Qijie He
- Department of Chemistry, South University of Science and Technology of China, Shenzhen 518055, China
| | - Juncheng Li
- Department of Chemistry, South University of Science and Technology of China, Shenzhen 518055, China
| | - Jun Wang
- Department of Chemistry, South University of Science and Technology of China, Shenzhen 518055, China
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43
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Archer RM, Hutchby M, Winn CL, Fossey JS, Bull SD. A chiral ligand mediated aza-conjugate addition strategy for the enantioselective synthesis of β-amino esters that contain hydrogenolytically sensitive functionality. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.08.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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44
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Wang L, Chen J, Huang Y. Highly Enantioselective Aza‐Michael Reaction between Alkyl Amines and β‐Trifluoromethyl β‐Aryl Nitroolefins. Angew Chem Int Ed Engl 2015; 54:15414-8. [DOI: 10.1002/anie.201508371] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Indexed: 12/16/2022]
Affiliation(s)
- Leming Wang
- Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University, Shenzhen Graduate School, Shenzhen, 518055 (China) http://web.pkusz.edu.cn/huang
| | - Jiean Chen
- Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University, Shenzhen Graduate School, Shenzhen, 518055 (China) http://web.pkusz.edu.cn/huang
| | - Yong Huang
- Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University, Shenzhen Graduate School, Shenzhen, 518055 (China) http://web.pkusz.edu.cn/huang
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45
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Wang L, Chen J, Huang Y. Highly Enantioselective Aza-Michael Reaction between Alkyl Amines and β-Trifluoromethyl β-Aryl Nitroolefins. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508371] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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46
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Novel 3-C-aminomethyl-hexofuranose-derived thioureas and their testing in asymmetric catalysis. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.07.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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47
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Desimoni G, Faita G, Quadrelli P. Enantioselective Catalytic Reactions with N-Acyliden Penta-atomic Aza-heterocycles. Heterocycles as Masked Bricks To Build Chiral Scaffolds. Chem Rev 2015; 115:9922-80. [DOI: 10.1021/acs.chemrev.5b00097] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Giovanni Desimoni
- Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
| | - Giuseppe Faita
- Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
| | - Paolo Quadrelli
- Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
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48
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Tálas E, Szíjjártó GP, Tompos A. Hydroamination reactions of dialkyl esters of 2-buthenedioic acids with polyetheramines under catalytic and non-catalytic conditions. REACTION KINETICS MECHANISMS AND CATALYSIS 2015. [DOI: 10.1007/s11144-015-0851-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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49
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Uraguchi D, Yamada K, Ooi T. HighlyE-Selective and Enantioselective Michael Addition to Electron-Deficient Internal Alkynes Under Chiral Iminophosphorane Catalysis. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503928] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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50
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Uraguchi D, Yamada K, Ooi T. Highly
E
‐Selective and Enantioselective Michael Addition to Electron‐Deficient Internal Alkynes Under Chiral Iminophosphorane Catalysis. Angew Chem Int Ed Engl 2015; 54:9954-7. [DOI: 10.1002/anie.201503928] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio‐Molecules (WPI‐ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464‐8603 (Japan)
| | - Kohei Yamada
- Institute of Transformative Bio‐Molecules (WPI‐ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464‐8603 (Japan)
| | - Takashi Ooi
- Institute of Transformative Bio‐Molecules (WPI‐ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464‐8603 (Japan)
- CREST, Japan Science and Technology Agency (JST), Nagoya University, Nagoya 464‐8603 (Japan)
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