1
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Li HY, Chen WA, Lin HY, Tsai CW, Chiu YT, Yun WY, Lee NC, Chien YH, Hwu WL, Cheng WC. A practical synthesis of nitrone-derived C5a-functionalized isofagomines as protein stabilizers to treat Gaucher disease. Commun Chem 2024; 7:91. [PMID: 38643239 PMCID: PMC11032326 DOI: 10.1038/s42004-024-01164-9] [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: 04/02/2023] [Accepted: 03/28/2024] [Indexed: 04/22/2024] Open
Abstract
Isofagomine (IFG) and its analogues possess promising glycosidase inhibitory activities. However, a flexible synthetic strategy toward both C5a-functionalized IFGs remains to be explored. Here we show a practical synthesis of C5a-S and R aminomethyl IFG-based derivatives via the diastereoselective addition of cyanide to cyclic nitrone 1. Nitrone 1 was conveniently prepared on a gram scale and in high yield from inexpensive (-)-diethyl D-tartrate via a straightforward method, with a stereoselective Michael addition of a nitroolefin and a Nef reaction as key steps. A 268-membered library (134 × 2) of the C5a-functionalized derivatives was submitted to enzyme- or cell-based bio-evaluations, which resulted in the identification of a promising β-glucocerebrosidase (GCase) stabilizer demonstrating a 2.7-fold enhancement at 25 nM in p.Asn370Ser GCase activity and a 13-fold increase at 1 μM in recombinant human GCase activity in Gaucher cell lines.
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Affiliation(s)
- Huang-Yi Li
- Genomics Research Center, Academia Sinica, 128, Section 2, Academia Road, Taipei, 11529, Taiwan
| | - Wei-An Chen
- Genomics Research Center, Academia Sinica, 128, Section 2, Academia Road, Taipei, 11529, Taiwan
| | - Hung-Yi Lin
- Genomics Research Center, Academia Sinica, 128, Section 2, Academia Road, Taipei, 11529, Taiwan
| | - Chi-Wei Tsai
- Genomics Research Center, Academia Sinica, 128, Section 2, Academia Road, Taipei, 11529, Taiwan
| | - Yu-Ting Chiu
- Genomics Research Center, Academia Sinica, 128, Section 2, Academia Road, Taipei, 11529, Taiwan
| | - Wen-Yi Yun
- Genomics Research Center, Academia Sinica, 128, Section 2, Academia Road, Taipei, 11529, Taiwan
| | - Ni-Chung Lee
- Department of Pediatrics and Medical Genetics, National Taiwan University Hospital, 8 Chung-Shan South Road, Taipei, 10041, Taiwan
| | - Yin-Hsiu Chien
- Department of Pediatrics and Medical Genetics, National Taiwan University Hospital, 8 Chung-Shan South Road, Taipei, 10041, Taiwan
| | - Wuh-Liang Hwu
- Department of Pediatrics and Medical Genetics, National Taiwan University Hospital, 8 Chung-Shan South Road, Taipei, 10041, Taiwan
- Center for Precision Medicine, China Medical University Hospital, 2, Yude Road, Taichung, 404327, Taiwan
| | - Wei-Chieh Cheng
- Genomics Research Center, Academia Sinica, 128, Section 2, Academia Road, Taipei, 11529, Taiwan.
- Department of Chemistry, National Cheng-Kung University, 1, University Road, Tainan, 701, Taiwan.
- Department of Applied Chemistry, National Chiayi University, 300, Xuefu Road, Chiayi, 600, Taiwan.
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, 100, Shih-Chuan 1st Road, Kaohsiung, 807, Taiwan.
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2
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Ayesha, Ashraf A, Arshad M, Sajid N, Rasool N, Abbas M, Nazeer U, Khalid M, Imran M. Dinuclear Zn-Catalytic System as Brønsted Base and Lewis Acid for Enantioselectivity in Same Chiral Environment. ACS OMEGA 2024; 9:6074-6092. [PMID: 38375498 PMCID: PMC10876046 DOI: 10.1021/acsomega.3c07446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 12/24/2023] [Accepted: 12/27/2023] [Indexed: 02/21/2024]
Abstract
Zinc (Zn) is a crucial element with remarkable significance in organic transformations. The profusion of harmless zinc salts in the Earth's outer layer qualifies zinc as a noteworthy contender for inexpensive and eco-friendly reagents and catalysts. Recently, widely recognized uses of organo-Zn compounds in the field of organic synthesis have undergone extensive expansion toward asymmetric transformations. The ProPhenol ligand, a member of the chiral nitrogenous-crown family, exhibits the spontaneous formation of a dual-metal complex when reacted with alkyl metal (R-M) reagents, e.g., ZnEt2. The afforded Zn complex possesses two active sites, one Lewis acid and the other Brønsted base, thereby facilitating the activation of nucleophiles and electrophiles simultaneously within the same chiral pocket. In this comprehensive analysis, we provide a thorough account of the advancement and synthetic potential of these diverse catalysts in organic synthesis, while emphasizing the reactivity and selectivities, i.e., dr and ee due to the design/structure of the ligands employed.
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Affiliation(s)
- Ayesha
- Department
of Chemistry, Government College University
Faisalabad, Faisalabad 38000, Pakistan
| | - Aisha Ashraf
- Department
of Chemistry, Government College University
Faisalabad, Faisalabad 38000, Pakistan
| | - Mahwish Arshad
- Department
of Chemistry, Government College University
Faisalabad, Faisalabad 38000, Pakistan
- Roy
and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Numan Sajid
- Department
of Chemistry, Government College University
Faisalabad, Faisalabad 38000, Pakistan
| | - Nasir Rasool
- Department
of Chemistry, Government College University
Faisalabad, Faisalabad 38000, Pakistan
| | - Mujahad Abbas
- Department
of Chemistry, Government College University
Faisalabad, Faisalabad 38000, Pakistan
| | - Usman Nazeer
- Chemistry
Department, University of Houston, 3585 Cullen Boulvard, Houston, Texas 77204-5003, United States
| | | | - Muhammad Imran
- Chemistry
Department, Faculty of Science, King Khalid
University, P.O. Box 9004, Abha 61413, Saudi Arabia
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3
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Dong Y, Li M, Liu J, Liu Y, Huang W, Shreeve JM, Tang Y. Pushing the limits of the heat of detonation via the construction of polynitro bipyrazole. MATERIALS HORIZONS 2023; 10:5729-5733. [PMID: 37800191 DOI: 10.1039/d3mh01381b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
The trinitromethyl group is a highly oxidized group that is found as an active functionality in many high-energy-density materials. The most frequently used previous synthetic method for the introduction of the trinitromethyl group is the nitration of heterocyclic compounds containing an acetonyl/ethyl acetate/chloroxime group. Now a novel strategy for constructing a trinitromethyl group (5) via nitration of an ethylene bridged compound, dipyrazolo[1,5-a:5',1'-c]pyrazine (2), is reported. In addition, the other two nitrated products (3 and 4) were obtained under different nitrating conditions. Compound 5 has excellent detonation performance (Dv = 9047 m s-1, P = 35.6 GPa), and a low mechanical sensitivity (IS = 10 J, FS = 216 N), with an especially attractive heat of detonation of 6921 kJ kg-1, which significantly exceeds that of the state-of-the-art explosive CL-20 (Q: 6162 kJ kg-1).
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Affiliation(s)
- Yaqun Dong
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Miao Li
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Jing Liu
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Yuji Liu
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Wei Huang
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Jean'ne M Shreeve
- Department of Chemistry, University of Idaho, Moscow, Idaho, 83844-2343, USA
| | - Yongxing Tang
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
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4
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Takashima T, Ece H, Yurino T, Ohkuma T. Ag-Catalyzed Cyanomethylation of Amines Using Nitromethane as a C 1 Source. Org Lett 2023; 25:6052-6056. [PMID: 37560921 DOI: 10.1021/acs.orglett.3c02256] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
A new methodology to afford α-amino nitriles through oxidative cyanomethylation of amines using nitromethane as the methylene source in the presence of Me3SiCN without the addition of an external oxidant was developed. A catalytic amount of AgCN and a stoichiometric amount of LiBF4 cooperatively promoted the transformation. A wide variety of the amines, including both aromatic compounds and aliphatic ones, which are labile under oxidative conditions, were applicable to the reaction.
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Affiliation(s)
- Takuya Takashima
- Graduate School of Chemical Sciences and engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Hamdiye Ece
- Graduate School of Chemical Sciences and engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Taiga Yurino
- Division of Applied Chemistry and Frontier Chemistry Center, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Takeshi Ohkuma
- Division of Applied Chemistry and Frontier Chemistry Center, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
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5
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Sivanandan ST, Nair DK, Namboothiri INN. Recent advances in the synthetic applications of Morita-Baylis-Hillman and Rauhut-Currier adducts of nitroalkenes. Org Biomol Chem 2023; 21:6243-6262. [PMID: 37486601 DOI: 10.1039/d3ob00853c] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
The Morita-Baylis-Hillman (MBH) and Rauhut-Currier (RC) adducts of nitroalkenes are important synthetic intermediates in organic synthesis. This review discusses the applications of different MBH and RC adducts of nitroalkenes such as MBH alcohols, acetates, bromides and hydrazinonitroalkenes as well as ketoalkylnitroalkenes in the synthesis of complex molecules including carbocycles and heterocycles. It also covers the mechanistic aspects, including the key intermediates and the reaction pathways. Early reports on MBH and RC reactions of nitroalkenes and applications of the products were covered in previous reviews. The present review covers the reports that appeared in the timeline of 2015-2023.
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Affiliation(s)
- Sudheesh T Sivanandan
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, India.
- Department of Chemistry, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Divya K Nair
- Department of Chemistry, Mercy College, Palakkad, Kerala 678 006, India
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6
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Waters MDJ, Casanova JT, Wörner HJ. Ultrafast dissociation of nitromethane from the 3p Rydberg state. Mol Phys 2023. [DOI: 10.1080/00268976.2022.2164749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Max D. J. Waters
- Laboratory of Physical Chemistry, ETH Zürich, Zürich, Switzerland
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7
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Sukhorukov AY. Interrupted Nef and Meyer Reactions: A Growing Point for Diversity-Oriented Synthesis Based on Nitro Compounds. Molecules 2023; 28:686. [PMID: 36677743 PMCID: PMC9860707 DOI: 10.3390/molecules28020686] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 12/27/2022] [Accepted: 12/30/2022] [Indexed: 01/13/2023] Open
Abstract
The Nef reaction (nitro to carbonyl group conversion) and related Meyer reaction are among the key transformations of aliphatic nitro compounds. The interrupted versions of these reactions in which the normal pathway is redirected to a different end product by an external nucleophile are much less common, albeit these processes substantially increase the synthetic potential of nitro compounds. In this review, examples of interrupted Nef and Meyer reactions are summarized, and the prospects of this methodology in diversity-oriented organic synthesis are analyzed. The bibliography contains 90 references.
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Affiliation(s)
- Alexey Yu Sukhorukov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect, 47, Moscow 119991, Russia
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8
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Malykhin RS, Boyko YD, Nelyubina YV, Ioffe SL, Sukhorukov AY. Interrupted Nef Reaction of Cyclic Nitronates: Diastereoselective Access to Densely Substituted α-Chloronitroso Compounds. J Org Chem 2022; 87:16617-16631. [DOI: 10.1021/acs.joc.2c02281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Affiliation(s)
- Roman S. Malykhin
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991, Leninsky prospect, 47, Moscow, Russian Federation
- Department of Chemistry, M. V. Lomonosov Moscow State University, 119991, Leninskie gory, 1, str. 3, Moscow, Russian Federation
| | - Yaroslav D. Boyko
- UIUC: Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Yulia V. Nelyubina
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991, Vavilova str. 28, Moscow, Russian Federation
| | - Sema L. Ioffe
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991, Leninsky prospect, 47, Moscow, Russian Federation
| | - Alexey Yu. Sukhorukov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991, Leninsky prospect, 47, Moscow, Russian Federation
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9
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Dihydrooxazine Byproduct of a McMurry–Melton Reaction en Route to a Synthetic Bacteriochlorin. ORGANICS 2022. [DOI: 10.3390/org3030019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A synthetic route to gem-dimethyl-substituted bacteriochlorins—models of native bacteriochlorophylls—relies on the formation of a dihydrodipyrrin precursor via a series of established reactions: van Leusen pyrrole formation, Vilsmeier formylation, Henry reaction, borohydride reduction, Michael addition, and McMurry–Melton pyrroline formation. The latter is the least known of the series. Here, the McMurry–Melton reaction of a 2-(6-oxo-2-nitrohexyl)pyrrole in the presence of TiCl3 and an ammonium acetate buffer formed the expected Δ1-pyrroline, as well as an unexpected polar, cyclic byproduct (a 5,6-dihydro-4H-1,2-oxazin-6-ol), each attached to the 2-methylpyrrole unit. Both species were characterized by single-crystal X-ray diffraction. The McMurry–Melton reaction is a type of intercepted Nef reaction (the transformation of a nitroalkyl motif into a carbonyl group), where both the Δ1-pyrroline and the dihydrooxazine derive from the reaction of the nitrogen derived from the nitro group upon complete or partial reductive deoxygenation, respectively, with the γ-keto group. The report also considers competing Nef and McMurry–Melton reactions, the nature of available TiCl3 reagents, and the use of ammonium acetate for buffering the TiCl3/HCl reagent.
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10
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11
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Hsu YY, Luo SQ, Hong BC, Chien SY. A mild one-pot transformation of nitroalkanes to ketones or aldehydes via a visible-light photocatalysis-hydrolysis sequence. Org Biomol Chem 2022; 20:3292-3302. [PMID: 35388394 DOI: 10.1039/d2ob00267a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using a visible-light photoredox catalysis strategy with household decorative blue LEDs and the additives Et3N and DIPEA, as well as the subsequent hydrolysis sequence, a mild one-pot process for the direct transformation of nitroalkanes to the corresponding ketones and aldehydes, constituting a Nef-like reaction, has been developed. It is worth noting that by using an appropriate photocatalyst (e.g., [Ir(dtbbpy)(ppy)2]PF6) and the extra additive Et3N with the combination of DIPEA and Mg(ClO4)2 in i-PrOH (instead of CH3CN), the transformation of nitroalkanes to the corresponding oximes, rather than nitrones, can be markedly more effective. The oximes can then be hydrolyzed to ketones by reaction with CuCl2·2H2O in a pH 7 buffer solution. This process is appealing because of the benefits of efficient conversion, mild conditions, high yields, and general applicability to compounds with a wide range of labile functional groups.
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Affiliation(s)
- Yin-Yin Hsu
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chiayi 621, Taiwan.
| | - Sheng-Qi Luo
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chiayi 621, Taiwan.
| | - Bor-Cherng Hong
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chiayi 621, Taiwan.
| | - Su-Ying Chien
- Instrumentation Center, National Taiwan University, Taipei, 106, Taiwan
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12
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Ballini R, Palmieri A, Petrini M. Catalysts’ evolution in the asymmetric conjugate addition of nitroalkanes to electron-poor alkenes. Org Chem Front 2022. [DOI: 10.1039/d2qo01341j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review provides a journey of the catalyst usage for the enantioselective conjugate addition of nitroalkanes to electron-poor olefins from the early attempts to the latest achievements. Selected applications are also reported.
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Affiliation(s)
- Roberto Ballini
- School of Science and Technology, Chemistry Division, University of Camerino, CHIP, Via Madonna delle Carceri, 62032 Camerino, MC, Italy
| | - Alessandro Palmieri
- School of Science and Technology, Chemistry Division, University of Camerino, CHIP, Via Madonna delle Carceri, 62032 Camerino, MC, Italy
| | - Marino Petrini
- School of Science and Technology, Chemistry Division, University of Camerino, CHIP, Via Madonna delle Carceri, 62032 Camerino, MC, Italy
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13
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Li YN, Li XL, Wu JB, Jiang H, Liu Y, Guo Y, Zeng YF, Wang Z. Metal-free regioselective nitration of quinoxalin-2(1 H)-ones with tert-butyl nitrite. Org Biomol Chem 2021; 19:10554-10559. [PMID: 34854446 DOI: 10.1039/d1ob02015c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A metal-free coupling of quinoxalin-2(1H)-ones with tert-butyl nitrite has been developed. Distinctly from the previous functionalization of quinoxalin-2(1H)-ones, this nitration reaction took place selectively at the C7 or C5 position of the phenyl ring, affording a series of 7-nitro and 5-nitro quinoxalin-2(1H)-ones in moderate to good yields. Preliminary mechanistic studies revealed that the reaction may involve a radical process.
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Affiliation(s)
- Yi-Na Li
- School of Pharmaceutical Science, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Xue-Lin Li
- The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China
| | - Jin-Bo Wu
- School of Pharmaceutical Science, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Hong Jiang
- School of Pharmaceutical Science, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Yunmei Liu
- School of Pharmaceutical Science, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Yu Guo
- School of Pharmaceutical Science, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Yao-Fu Zeng
- School of Pharmaceutical Science, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Zhen Wang
- School of Pharmaceutical Science, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
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14
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Zawadzińska K, Ríos-Gutiérrez M, Kula K, Woliński P, Mirosław B, Krawczyk T, Jasiński R. The Participation of 3,3,3-Trichloro-1-nitroprop-1-ene in the [3 + 2] Cycloaddition Reaction with Selected Nitrile N-Oxides in the Light of the Experimental and MEDT Quantum Chemical Study. Molecules 2021; 26:6774. [PMID: 34833866 PMCID: PMC8622200 DOI: 10.3390/molecules26226774] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 11/04/2021] [Accepted: 11/05/2021] [Indexed: 11/17/2022] Open
Abstract
The regioselective zw-type [3 + 2] cycloaddition (32CA) reactions of a series of aryl-substituted nitrile N-oxides (NOs) with trichloronitropropene (TNP) have been both experimentally and theoretically studied within the Molecular Electron Density Theory (MEDT). Zwitterionic NOs behave as moderate nucleophiles while TNP acts as a very strong electrophile in these polar 32CA reactions of forward electron density flux, which present moderate activation Gibbs free energies of 22.8-25.6 kcal·mol-1 and an exergonic character of 28.4 kcal·mol-1 that makes them irreversible and kinetically controlled. The most favorable reaction is that involving the most nucleophilic MeO-substituted NO. Despite Parr functions correctly predicting the experimental regioselectivity with the most favorable O-CCCl3 interaction, these reactions follow a two-stage one-step mechanism in which formation of the O-C(CCl3) bond takes place once the C-C(NO2) bond is already formed. The present MEDT concludes that the reactivity differences in the series of NOs come from their different nucleophilic activation and polar character of the reactions, rather than any mechanistic feature.
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Affiliation(s)
- Karolina Zawadzińska
- Department of Organic Chemistry and Technology, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland; (K.Z.); (K.K.); (P.W.)
| | - Mar Ríos-Gutiérrez
- Department of Organic Chemistry, University of Valencia, Dr. Moliner 50, Burjassot, 46100 Valencia, Spain
| | - Karolina Kula
- Department of Organic Chemistry and Technology, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland; (K.Z.); (K.K.); (P.W.)
| | - Przemysław Woliński
- Department of Organic Chemistry and Technology, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland; (K.Z.); (K.K.); (P.W.)
| | - Barbara Mirosław
- Department of General and Coordination Chemistry and Crystallography, Maria Curie-Sklodowska University in Lublin, Pl. Marii Curie-Sklodowskiej 3, 20-031 Lublin, Poland;
| | - Tomasz Krawczyk
- Department of Chemical Organic Technology and Petrochemistry, Silesian University of Technology, Krzywoustego 4, 44-100 Gliwice, Poland;
| | - Radomir Jasiński
- Department of Organic Chemistry and Technology, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland; (K.Z.); (K.K.); (P.W.)
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15
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Disadee W, Ruchirawat S. Oxazaborolidine-catalyzed reductive parallel kinetic resolution of ketones from β-nitro-azabicycles for the synthesis of chiral hypoestestatins 1, 2. Org Biomol Chem 2021; 19:8794-8805. [PMID: 34586134 DOI: 10.1039/d1ob01608c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel approach for the synthesis of 13a-methyl tylophora alkaloids has been reported. The key features included two different synthetic pathways targeted at transforming the β-nitro-azabicycle to the phenanthrene core. The successful steps involved the oxidation of the nitro-piperidine moiety to the corresponding α,β-unsaturated ketone, and an oxidative biaryl coupling reaction for phenanthrene ring formation. Finally, the desired product was obtained via a formal reductive removal of the hydroxyl group. This methodology has been applied for the synthesis of 13a-methyl tylophora alkaloids in up to 65% yield over six steps from β-nitro-azabicycles. Both natural and unnatural enantioenriched hypoestestatins 1 and 2, and related compounds were synthesized using parallel kinetic resolution of the CBS-oxazaborolidine-catalyzed reduction of racemic ketones to provide two separable diastereomeric alcohols in combined yields up to 91% and with high enantioselectvity (up to 89% ee). In addition, the catalytic asymmetric reduction to seco-hypoestestatins 1 and 2 has been reported for the first time. Thus, the ability to develop the racemic mixtures to both enatioenriched forms offers benefit for various biological assays in the future.
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Affiliation(s)
- Wannaporn Disadee
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, Lak Si, Bangkok 10210, Thailand.
| | - Somsak Ruchirawat
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, Lak Si, Bangkok 10210, Thailand.
- Program in Chemical Biology, Chulabhorn Graduate Institute, Laksi, Bangkok 10210, Thailand
- The Center of Excellence on Environmental Health and Toxicology (EHT), Bangkok 10400, Thailand
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16
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Zhou C, Lv J, Xu W, Lu H, Kato T, Liu Y, Maruoka K. Highly Selective Monoalkylation of Active Methylene and Related Derivatives using Alkylsilyl Peroxides by a Catalytic CuI‐DMAP System. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100440] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Canhua Zhou
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Jiamin Lv
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Weiping Xu
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Hanbin Lu
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Terumasa Kato
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery Guangdong University of Technology Guangzhou 510006 P. R. China
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo Kyoto 606-8501 Japan
| | - Yan Liu
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Keiji Maruoka
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery Guangdong University of Technology Guangzhou 510006 P. R. China
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo Kyoto 606-8501 Japan
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17
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Xu Y, Chen Y, Liu X, Xue S. Radical Photopolymerization Using 1,4-Dihydropyrrolo[3,2- b]pyrrole Derivatives Prepared via One-Pot Synthesis. ACS OMEGA 2021; 6:20902-20911. [PMID: 34423198 PMCID: PMC8374902 DOI: 10.1021/acsomega.1c02338] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 07/23/2021] [Indexed: 06/13/2023]
Abstract
Radical photopolymerization has attracted significant attention for manufacturing products with complicated structures. Herein, the synthesized 1,4-bis(4-bromophenyl)-2,5-bis(4-nitrophenyl)-1,4-dihydropyrrole[3,2-b]pyrrole (PyBN) is found to show varying photoactivity upon irradiation at different wavelengths. PyBN affords two main absorption bands, and its maximum absorption peak is at 462 nm, attributing to its strong intramolecular charge transfer property based on the donor-acceptor structure. It efficiently photoinitiates the radical photopolymerization of different (meth)acrylate materials under 365 and 395 nm LED irradiation. The highest double bond conversion of 99.86% is achieved for these materials. Under 470 nm LED, PyBN does not show molecular structure change from photolysis results as a result of intramolecular charge transfer. Therefore, PyBN shows wavelength-selective photoactivity with potential application in dual-wavelength volumetric additive manufacturing. A unique solid product is successfully fabricated using a 365 nm LED with co-irradiation of a 470 nm LED. Additionally, PyBN incorporating camphorquinone (CQ) as a two-component visible light photoinitiator system is investigated under 470 nm LED irradiation. As PyBN has a charge transfer activity at 470 nm, the combination with CQ exhibits a good synergistic interaction. Besides nitro-based PyBN, a methyl-based PyBC was prepared as a reference compound.
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Affiliation(s)
- Yuanyuan Xu
- Tianjin Key Laboratory of
Organic Solar Cells and Photochemical Conversion, Tianjin Key Laboratory
of Drug Targeting and Bioimaging, Department of Applied Chemistry,
School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Yu Chen
- Tianjin Key Laboratory of
Organic Solar Cells and Photochemical Conversion, Tianjin Key Laboratory
of Drug Targeting and Bioimaging, Department of Applied Chemistry,
School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Xuguang Liu
- Tianjin Key Laboratory of
Organic Solar Cells and Photochemical Conversion, Tianjin Key Laboratory
of Drug Targeting and Bioimaging, Department of Applied Chemistry,
School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Song Xue
- Tianjin Key Laboratory of
Organic Solar Cells and Photochemical Conversion, Tianjin Key Laboratory
of Drug Targeting and Bioimaging, Department of Applied Chemistry,
School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
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18
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Aksenov AV, Grishin IY, Aksenov NA, Malyuga VV, Aksenov DA, Nobi MA, Rubin M. Electrophilically Activated Nitroalkanes in Synthesis of 3,4-Dihydroquinozalines. Molecules 2021; 26:4274. [PMID: 34299549 PMCID: PMC8306411 DOI: 10.3390/molecules26144274] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 07/12/2021] [Accepted: 07/12/2021] [Indexed: 11/22/2022] Open
Abstract
Nitroalkanes activated with polyphosphoric acid serve as efficient electrophiles in reactions with various nucleophilic amines. Strategically placed second functionality allows for the design of annulation reactions enabling preparation of various heterocycles. This strategy was employed to develop an innovative synthetic approach towards 3,4-dihydroquinazolines from readily available 2-(aminomethyl)anilines.
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Affiliation(s)
- Alexander V. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (I.Y.G.); (N.A.A.); (V.V.M.); (D.A.A.)
| | - Igor Yu. Grishin
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (I.Y.G.); (N.A.A.); (V.V.M.); (D.A.A.)
| | - Nicolai A. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (I.Y.G.); (N.A.A.); (V.V.M.); (D.A.A.)
| | - Vladimir V. Malyuga
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (I.Y.G.); (N.A.A.); (V.V.M.); (D.A.A.)
| | - Dmitrii A. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (I.Y.G.); (N.A.A.); (V.V.M.); (D.A.A.)
| | - Mezvah A. Nobi
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, KS 66045, USA;
| | - Michael Rubin
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russia; (I.Y.G.); (N.A.A.); (V.V.M.); (D.A.A.)
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, KS 66045, USA;
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19
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Sarkar T, Shah TA, Maharana PK, Talukdar K, Das BK, Punniyamurthy T. Transition-Metal-Catalyzed Directing Group Assisted (Hetero)aryl C-H Functionalization: Construction of C-C/C-Heteroatom Bonds. CHEM REC 2021; 21:3758-3778. [PMID: 34164920 DOI: 10.1002/tcr.202100143] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 06/14/2021] [Accepted: 06/14/2021] [Indexed: 12/17/2022]
Abstract
Transition-metal-catalyzed C-H functionalization is one of the fascinating scientific fronts in organic synthesis for the formation of conjugated arenes and has emerged as a benchmark to revolutionize the synthetic enterprise since past decades. In this realm, chelation-guided functionalization of C-H bonds using an exogenous directing group has received considerable attention recently for the expedient regioselective construction of C-C and C-heteroatom bonds as an efficient and sustainable alternative. This article outlines our contribution towards a wide variety of transformations that have been achieved by the directed C-H functionalization through the fine tuning of catalytic systems.
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Affiliation(s)
- Tanumay Sarkar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039
| | - Tariq A Shah
- Department of Chemistry, University of Kashmir, Srinagar, 190006, India
| | | | - Kangkan Talukdar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039
| | - Bijay Ketan Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039
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20
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Antonova YA, Ioffe SL, Sukhorukov AY, Tabolin AA. Sequential Acylation/Silylation/Hetero‐Claisen Rearrangement of Nitroalkanes for the Synthesis of Protected Hydroxyoxime Derivatives. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Yulia A. Antonova
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prosp. 47 Moscow 119991 Russia
- Department of Chemistry M. V. Lomonosov Moscow State University Leninskie gory 1 Moscow 119991 Russia
| | - Sema L. Ioffe
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prosp. 47 Moscow 119991 Russia
| | - Alexey Yu. Sukhorukov
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prosp. 47 Moscow 119991 Russia
| | - Andrey A. Tabolin
- N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prosp. 47 Moscow 119991 Russia
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21
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Wei WT, Li Q, Zhang MZ, He WM. N-Radical enabled cyclization of 1,n-enynes. CHINESE JOURNAL OF CATALYSIS 2021. [DOI: 10.1016/s1872-2067(20)63702-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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22
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Maule I, Razzetti G, Restelli A, Palmieri A, Colombo C, Ballini R. Thermal Stability Evaluation of Nitroalkanes with Differential Scanning Calorimetry. Org Process Res Dev 2021. [DOI: 10.1021/acs.oprd.0c00433] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ivano Maule
- Dipharma Francis S.r.l., Via Bissone, 5, Baranzate, 20021 Milano, Italy
| | - Gabriele Razzetti
- Dipharma Francis S.r.l., Via Bissone, 5, Baranzate, 20021 Milano, Italy
| | | | - Alessandro Palmieri
- Green Chemistry Group-School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino, Italy
| | - Cinzia Colombo
- Dipharma Francis S.r.l., Via Bissone, 5, Baranzate, 20021 Milano, Italy
| | - Roberto Ballini
- Green Chemistry Group-School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino, Italy
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23
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Vila C, Cernicharo‐Toledo F, Blay G, Pedro JR. Nitroenynes as Electrophiles in Organocatalysis and their Application in the Synthesis of Chiral Heterocycles. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100208] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Carlos Vila
- Departament de Química Orgànica, Facultat de Química Universitat de València Dr. Moliner 50 46100 Burjassot València Spain
| | - Francisco Cernicharo‐Toledo
- Departament de Química Orgànica, Facultat de Química Universitat de València Dr. Moliner 50 46100 Burjassot València Spain
| | - Gonzalo Blay
- Departament de Química Orgànica, Facultat de Química Universitat de València Dr. Moliner 50 46100 Burjassot València Spain
| | - José R. Pedro
- Departament de Química Orgànica, Facultat de Química Universitat de València Dr. Moliner 50 46100 Burjassot València Spain
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24
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Guanidine-Amide-Catalyzed Aza-Henry Reaction of Isatin-Derived Ketimines: Origin of Selectivity and New Catalyst Design. Molecules 2021; 26:molecules26071965. [PMID: 33807341 PMCID: PMC8037019 DOI: 10.3390/molecules26071965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 03/29/2021] [Accepted: 03/29/2021] [Indexed: 12/05/2022] Open
Abstract
Density functional theory (DFT) calculations were performed to investigate the mechanism and the enantioselectivity of the aza-Henry reaction of isatin-derived ketimine catalyzed by chiral guanidine–amide catalysts at the M06-2X-D3/6-311+G(d,p)//M06-2X-D3/6-31G(d,p) (toluene, SMD) theoretical level. The catalytic reaction occurred via a three-step mechanism: (i) the deprotonation of nitromethane by a chiral guanidine–amide catalyst; (ii) formation of C–C bonds; (iii) H-transfer from guanidine to ketimine, accompanied with the regeneration of the catalyst. A dual activation model was proposed, in which the protonated guanidine activated the nitronate, and the amide moiety simultaneously interacted with the ketimine substrate by intermolecular hydrogen bonding. The repulsion of CPh3 group in guanidine as well as N-Boc group in ketimine raised the Pauli repulsion energy (∆EPauli) and the strain energy (∆Estrain) of reacting species in the unfavorable si-face pathway, contributing to a high level of stereoselectivity. A new catalyst with cyclopropenimine and 1,2-diphenylethylcarbamoyl as well as sulfonamide substituent was designed. The strong basicity of cyclopropenimine moiety accelerated the activation of CH3NO2 by decreasing the energy barrier in the deprotonation step. The repulsion between the N-Boc group in ketimine and cyclohexyl group as well as chiral backbone in the new catalyst raised the energy barrier in C–C bond formation along the si-face attack pathway, leading to the formation of R-configuration product. A possible synthetic route for the new catalyst is also suggested.
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25
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Lupidi G, Palmieri A, Petrini M. Synthesis of Nitro Alcohols by Riboflavin Promoted Tandem Nef‐Henry Reactions on Nitroalkanes. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Gabriele Lupidi
- School of Science and Technology Chemistry Division University of Camerino Via S. Agostino 1 62032 Camerino
| | - Alessandro Palmieri
- School of Science and Technology Chemistry Division University of Camerino Via S. Agostino 1 62032 Camerino
| | - Marino Petrini
- School of Science and Technology Chemistry Division University of Camerino Via S. Agostino 1 62032 Camerino
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26
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Aksenov AV, Aksenov NA, Kirilov NK, Skomorokhov AA, Aksenov DA, Kurenkov IA, Sorokina EA, Nobi MA, Rubin M. Does electrophilic activation of nitroalkanes in polyphosphoric acid involve formation of nitrile oxides? RSC Adv 2021; 11:35937-35945. [PMID: 35492804 PMCID: PMC9043268 DOI: 10.1039/d1ra06503c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Accepted: 10/27/2021] [Indexed: 11/21/2022] Open
Abstract
The mechanistic rationale involving activation of nitroalkanes towards interaction with nucleophilic reagents in the presence of polyphosphoric acid (PPA) was re-evaluated. Could nitrile oxide moieties be formed during this process? This experiment demonstrates that at least in some cases this could happen, as generated nitrile oxides were successfully intercepted as adducts of [3 + 2] cycloadditions. The mechanistic rationale involving activation of nitroalkanes towards interaction with nucleophilic reagents in the presence of polyphosphoric acid (PPA) was re-evaluated. Could nitrile oxide moieties be formed during this process?![]()
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Affiliation(s)
- Alexander V. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355017, Russia
| | - Nicolai A. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355017, Russia
| | - Nikita K. Kirilov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355017, Russia
| | - Anton A. Skomorokhov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355017, Russia
| | - Dmitrii A. Aksenov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355017, Russia
| | - Igor A. Kurenkov
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355017, Russia
| | - Elena A. Sorokina
- Organic Chemistry Department, Peoples' Friendship University of Russia (RUDN University), 6, Miklukho-Maklaya St., Moscow, 117198, Russian Federation
| | - Mezvah A. Nobi
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, KS 66045, USA
| | - Michael Rubin
- Department of Chemistry, North Caucasus Federal University, 1a Pushkin St., Stavropol 355017, Russia
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, KS 66045, USA
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27
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Motati DR, Amaradhi R, Ganesh T. Recent developments in the synthesis of azaindoles from pyridine and pyrrole building blocks. Org Chem Front 2021. [DOI: 10.1039/d0qo01079k] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The azaindole framework is ubiquitous in bioactive natural products and pharmaceuticals. This review highlights the synthetic approaches to azaindoles with advantages and limitations, mechanistic pathways and biological importance.
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Affiliation(s)
- Damoder Reddy Motati
- Department of Pharmacology and Chemical Biology
- Emory School of Medicine
- Atlanta
- USA
| | - Radhika Amaradhi
- Department of Pharmacology and Chemical Biology
- Emory School of Medicine
- Atlanta
- USA
| | - Thota Ganesh
- Department of Pharmacology and Chemical Biology
- Emory School of Medicine
- Atlanta
- USA
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28
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Yoshimura T, Umeda Y, Takahashi R, Matsuo JI. Development of Nitrolactonization Mediated by Iron(III) Nitrate Nonahydrate. Chem Pharm Bull (Tokyo) 2020; 68:1220-1225. [PMID: 33268654 DOI: 10.1248/cpb.c20-00645] [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
The nitrolactonization of alkenyl carboxylic acids mediated by Fe(NO3)3·9H2O has been developed. Nitrolactones were obtained in up to 93% yield by treatment of alkenyl carboxylic acids with Fe(NO3)3·9H2O. Mechanistic studies disclosed that the reaction proceeded through a radical intermediate generated from addition of NO2 to alkenyl carboxylic acids.
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Affiliation(s)
- Tomoyuki Yoshimura
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University
| | - Yuki Umeda
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University
| | - Risako Takahashi
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University
| | - Jun-Ichi Matsuo
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University
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29
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Balwe SG, Kim JS, Jeong YT. Metal-free regioselective construction of 2-aryl-substituted quinolines via Aza-Henry (Nitro-Mannich) reactions under neat conditions. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2020.1811871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Sandip Gangadhar Balwe
- Department of Image Science and Engineering, Pukyong National University, Busan, Republic of Korea
| | - Jong Su Kim
- Department of Image Science and Engineering, Pukyong National University, Busan, Republic of Korea
| | - Yeon Tae Jeong
- Department of Image Science and Engineering, Pukyong National University, Busan, Republic of Korea
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30
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Sukhorukov AY. Editorial: Nitro Compounds as Versatile Building Blocks for the Synthesis of Pharmaceutically Relevant Substances. Front Chem 2020; 8:595246. [PMID: 33195101 PMCID: PMC7604505 DOI: 10.3389/fchem.2020.595246] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Accepted: 09/03/2020] [Indexed: 11/26/2022] Open
Affiliation(s)
- Alexey Yu Sukhorukov
- Laboratory of Organic and Metal-Organic Nitrogen-Oxygen Systems, N. D. Zelinsky Institute of Organic Chemistry, Moscow, Russia.,Department of Innovational Materials and Technologies Chemistry, Plekhanov Russian University of Economics, Moscow, Russia
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31
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Iwasaki M, Ikemoto Y, Nishihara Y. Synthesis of 2-Isoxazoline N-Oxides by Copper-Mediated Radical Annulation of Alkenes with α-Nitrobenzyl Bromides. Org Lett 2020; 22:7577-7580. [PMID: 32936646 DOI: 10.1021/acs.orglett.0c02781] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Copper-mediated [3 + 2] annulation of alkenes with α-nitrobenzyl bromides has been developed. The reaction is promoted simply by a copper salt to produce the corresponding 2-isoxazoline N-oxides with perfect regioselectivity. The present method can be conducted under mild conditions, affording a diverse array of 2-isoxazoline N-oxides. The obtained products can readily be converted to the related heterocycles such as 2-isoxazoline and isoxazole. A radical-polar crossover pathway initiated by single-electron transfer from nitronate to a copper salt is proposed.
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32
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Hayashi Y, Wang X, Kawauchi G. Highly Enantioselective Access to syn-α,γ-Dihydroxycarbonyl Building Blocks via Organocatalyst-mediated Aldol Reaction as a Key Step. CHEM LETT 2020. [DOI: 10.1246/cl.200304] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yujiro Hayashi
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Xiaoling Wang
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Genki Kawauchi
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
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33
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Denitrative Cross-Couplings of Nitrostyrenes. Molecules 2020; 25:molecules25153390. [PMID: 32726964 PMCID: PMC7435674 DOI: 10.3390/molecules25153390] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 07/17/2020] [Accepted: 07/21/2020] [Indexed: 11/17/2022] Open
Abstract
Interestingly, β-nitrostyrenes, typically bench stable compounds, are highly promising cross-coupling partners, due to their excellent availability and well understood reactivity. In this review, we report on the discovery and advancements, in the field of stereoselective, denitrative cross-couplings of β-nitrostyrenes with miscellaneous organic reagents. The rapidly expanding field offers alternative access to a broad range of functionalized alkenes, including β-alkylated styrenes, chalcones, stilbenes, cinnamic acids, and conjugated sulfones and phosphonates. The most important mechanistic pathways are briefly discussed, to familiarize readers with the elementary reactions occurring during the coupling.
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34
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Thapa P, Hazoor S, Chouhan B, Vuong TT, Foss FW. Flavin Nitroalkane Oxidase Mimics Compatibility with NOx/TEMPO Catalysis: Aerobic Oxidization of Alcohols, Diols, and Ethers. J Org Chem 2020; 85:9096-9105. [PMID: 32569467 DOI: 10.1021/acs.joc.0c01013] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Biomimetic flavin organocatalysts oxidize nitromethane to formaldehyde and NOx-providing a relatively nontoxic, noncaustic, and inexpensive source for catalytic NO2 for aerobic TEMPO oxidations of alcohols, diols, and ethers. Alcohols were oxidized to aldehydes or ketones, cyclic ethers to esters, and terminal diols to lactones. In situ trapping of NOx and formaldehyde suggest an oxidative Nef process reminiscent of flavoprotein nitroalkane oxidase reactivity, which is achieved by relatively stable 1,10-bridged flavins. The metal-free flavin/NOx/TEMPO catalytic cycles are uniquely compatible, especially compared to other Nef and NOx-generating processes, and reveal selectivity over flavin-catalyzed sulfoxide formation. Aliphatic ethers were oxidized by this method, as demonstrated by the conversion of (-)-ambroxide to (+)-sclareolide.
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Affiliation(s)
- Pawan Thapa
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019-0065, United States
| | - Shan Hazoor
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019-0065, United States
| | - Bikash Chouhan
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019-0065, United States
| | - Thanh Thuy Vuong
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019-0065, United States
| | - Frank W Foss
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019-0065, United States
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35
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Yang L, Lin Z, Zheng K, Kong L, Hong R. A Modular Synthesis of Antitumor Macrolide (–)‐Lasonolide A †. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.202000026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Lin Yang
- CAS Key Laboratory of Synthetic Chemistry of Natural SubstancesCenter for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
- University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 China
| | - Zuming Lin
- CAS Key Laboratory of Synthetic Chemistry of Natural SubstancesCenter for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Kuan Zheng
- CAS Key Laboratory of Synthetic Chemistry of Natural SubstancesCenter for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
- University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 China
| | - Luyao Kong
- University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 China
| | - Ran Hong
- CAS Key Laboratory of Synthetic Chemistry of Natural SubstancesCenter for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
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36
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Greszler SN, Zhao G, Buchman M, Searle XB, Liu B, Voight EA. General Asymmetric Synthesis of Densely Functionalized Pyrrolidines via Endo-Selective [3+2] Cycloaddition of β-Quaternary-Substituted Nitroalkenes and Azomethine Ylides. J Org Chem 2020; 85:7620-7632. [PMID: 32374998 DOI: 10.1021/acs.joc.0c00820] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A scalable endo-selective synthesis of 2,3,4,5-tetrasubstituted pyrrolidines via cycloaddition of nitroalkenes and azomethine ylides is reported using a P,N-type ferrocenyl ligand and [Cu(OTf)]2·C6H6. The robust method is tolerant of a wide range of functionalities, including rarely reported quaternary nitroalkene substitution and heteroaromatic and hindered ortho-substituted arenes on the azomethine ylide. Subsequent transformations highlight the utility of the method in the synthesis of densely functionalized small molecules suitable for fragment-based drug discovery and the cystic fibrosis C2-corrector clinical candidate ABBV-3221.
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Affiliation(s)
- Stephen N Greszler
- Research & Development, AbbVie, Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States
| | - Gang Zhao
- Research & Development, AbbVie, Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States
| | - Marek Buchman
- Research & Development, AbbVie, Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States
| | - Xenia B Searle
- Research & Development, AbbVie, Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States
| | - Bo Liu
- Research & Development, AbbVie, Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States
| | - Eric A Voight
- Research & Development, AbbVie, Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States
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37
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Hensienne R, Cusson JP, Chénard É, Hanessian S. Catalytic Lewis and Brønsted acid syn-diastereoselective benzylic substitutions of α-hydroxy- β-nitro- and α-hydroxy- β-azido-alkyl arenes. CAN J CHEM 2020. [DOI: 10.1139/cjc-2020-0016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A series of alkyl and alkenyl p-methoxy arenes containing α,β-disubstituted diamino and amino alcohol groups were synthesized from β-nitro and β-azido benzylic alcohols in the presence of AuCl3 as catalyst. The formation of predominantly syn-disubstituted products were rationalized on the basis of mechanistic considerations and transition state models relying on A1,3-allylic strain. The products could have utility in the design of medicinally relevant compounds and as chiral ligands for asymmetric catalysis. A new synthesis of (+)-sertraline (Zoloft) was achieved.
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Affiliation(s)
- Raphaël Hensienne
- Department of Chemistry, Université de Montréal, Montréal, QC H3C 3J7, Canada
- Department of Chemistry, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Jean-Philippe Cusson
- Department of Chemistry, Université de Montréal, Montréal, QC H3C 3J7, Canada
- Department of Chemistry, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Étienne Chénard
- Department of Chemistry, Université de Montréal, Montréal, QC H3C 3J7, Canada
- Department of Chemistry, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Stephen Hanessian
- Department of Chemistry, Université de Montréal, Montréal, QC H3C 3J7, Canada
- Department of Chemistry, Université de Montréal, Montréal, QC H3C 3J7, Canada
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38
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Wang S, Huang Z, Zhang J. The Intramolecular Rauhut−Currier Reaction between Nitroalkenes and Acrylates: An Approach to 3‐Methylene‐3,4‐Dihydrocoumarin Scaffold. ChemistrySelect 2020. [DOI: 10.1002/slct.201904509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Sen Wang
- Institute and State Key Laboratory of Elemento-Organic Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Zhiqiang Huang
- Department of Applied Chemistry Tianjin Agricultural University Tianjin 300384 P. R. China
| | - Jingjing Zhang
- Department of Applied Chemistry Tianjin Agricultural University Tianjin 300384 P. R. China
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39
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Kawamoto M, Moriyama M, Ashida Y, Matsuo N, Tanabe Y. Total Syntheses of All Six Chiral Natural Pyrethrins: Accurate Determination of the Physical Properties, Their Insecticidal Activities, and Evaluation of Synthetic Methods. J Org Chem 2020; 85:2984-2999. [DOI: 10.1021/acs.joc.9b02767] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Momoyo Kawamoto
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Mizuki Moriyama
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Yuichiro Ashida
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Noritada Matsuo
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Yoo Tanabe
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
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40
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Ritu, Sharma C, Kumar S, Jain N. Singlet oxygen mediated dual C–C and C–N bond cleavage in visible light. Org Biomol Chem 2020; 18:2921-2928. [DOI: 10.1039/d0ob00563k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A tandem cleavage of carbon–carbon and carbon–nitrogen bonds in imidazo[1,2-a]pyridines and imidazo[1,2-a]quinolines is reported in the presence of eosin Y and visible light.
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Affiliation(s)
- Ritu
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
| | - Charu Sharma
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
| | - Sharvan Kumar
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
| | - Nidhi Jain
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
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41
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Iridium-Catalyzed Asymmetric Hydrogenation. TOP ORGANOMETAL CHEM 2020. [DOI: 10.1007/3418_2020_64] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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42
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Liu L, Ward RM, Schomaker JM. Mechanistic Aspects and Synthetic Applications of Radical Additions to Allenes. Chem Rev 2019; 119:12422-12490. [PMID: 31833759 DOI: 10.1021/acs.chemrev.9b00312] [Citation(s) in RCA: 131] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
More than 50 years have passed since Haszeldine reported the first addition of a trifluoromethyl radical to an allene; in the intervening years, both the chemistry of allenes and the reactivity of single-electron species have become topics of intense interest. In this Review, we provide an overview of the fundamentals of radical additions to allenes and highlight the emergence of theoretical and experimental evidence that reveals unique reactivity patterns for radical additions to allenes as compared with other unsaturated compounds. Factors capable of exerting control over the chemo-, regio-, and stereoselectivities of the attack of carbon- and heteroatom-based radicals at each of the three potential reactive sites in an allene substrate are described. These include reaction conditions, the nature of the attacking radical, the substitution pattern of the allene, and the length of the linker between the radical center and the proximal allene carbon in the substrate. Cycloaddition reactions between allenes and partners containing π-bonds, which are likely to proceed through radical pathways, are presented to highlight their ability to rapidly access complex polycyclic scaffolds. Finally, the synthetic utility of the products arising from these chemistries is described, including their applications to the construction of complex molecules.
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Affiliation(s)
- Lu Liu
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Robert M Ward
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Jennifer M Schomaker
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
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43
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Jiang H, Tang X, Xu Z, Wang H, Han K, Yang X, Zhou Y, Feng YL, Yu XY, Gui Q. TBAI-catalyzed selective synthesis of sulfonamides and β-aryl sulfonyl enamines: coupling of arenesulfonyl chlorides and sodium sulfinates with tert-amines. Org Biomol Chem 2019; 17:2715-2720. [PMID: 30775769 DOI: 10.1039/c8ob02992j] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A simple, practical and metal-free method has been developed for the synthesis of sulfonamides and β-arylsulfonyl enamines via the selective cleavage of C-N and C-H bonds through the iodine-catalyzed oxidation of arenesulfonyl chlorides and sodium sulfinates with tert-amines. The method uses commercially available inexpensive catalysts and oxidants, and has a wide substrate scope and operational simplicity.
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Affiliation(s)
- Hongmei Jiang
- College of Science, Hunan Agricultural University, Changsha 410128, People's Republic of China.
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44
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Affiliation(s)
- Sushobhan Mukhopadhyay
- Medicinal and Process Chemistry Division; CSIR-Central Drug Research Institute; Sector 10, Jankipuram Extension; Sitapur Road Lucknow 226031 Uttar Pradesh India
| | - Sanjay Batra
- Medicinal and Process Chemistry Division; CSIR-Central Drug Research Institute; Sector 10, Jankipuram Extension; Sitapur Road Lucknow 226031 Uttar Pradesh India
- Academy of Scientific and Innovative Research; CSIR - Human Resource Development Centre, (CSIR-HRDC) Campus, Sector 19; Kamla Nehru Nagar Ghaziabad 201002 Uttar Pradesh India
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45
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Ballini R, Palmieri A. Formation of Carbon‐Carbon Double Bonds: Recent Developments
via
Nitrous Acid Elimination (NAE) from Aliphatic Nitro Compounds. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900563] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Roberto Ballini
- Green Chemistry GroupSchool of Sciences and TechnologyChemistry DivisionUniversity of Camerino Via S. Agostino n. 1 62032 Camerino (MC) Italy
| | - Alessandro Palmieri
- Green Chemistry GroupSchool of Sciences and TechnologyChemistry DivisionUniversity of Camerino Via S. Agostino n. 1 62032 Camerino (MC) Italy
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46
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Willig F, Lang J, Hans AC, Ringenberg MR, Pfeffer D, Frey W, Peters R. Polyfunctional Imidazolium Aryloxide Betaine/Lewis Acid Catalysts as Tools for the Asymmetric Synthesis of Disfavored Diastereomers. J Am Chem Soc 2019; 141:12029-12043. [DOI: 10.1021/jacs.9b04902] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Felix Willig
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Johannes Lang
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Andreas C. Hans
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Mark R. Ringenberg
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Daniel Pfeffer
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Wolfgang Frey
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - René Peters
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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47
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Tavakolian M, Vahdati‐Khajeh S, Asgari S. Recent Advances in Solvent‐Free Asymmetric Catalysis. ChemCatChem 2019. [DOI: 10.1002/cctc.201900354] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Mina Tavakolian
- Department of ChemistryInstitute for Advanced Studies in Basic Sciences (IASBS) Zanjan 45137-6731 Iran
| | | | - Sepideh Asgari
- Department of ChemistryInstitute for Advanced Studies in Basic Sciences (IASBS) Zanjan 45137-6731 Iran
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48
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Mi X, Wang X. Crystal structure of 3-nitroquinoline 1-oxide, C 9H 6N 2O 3. Z KRIST-NEW CRYST ST 2019. [DOI: 10.1515/ncrs-2018-0397] [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
C9H6N2O3, monoclinic, P21/n (no. 14), a = 8.7156(3) Å, b = 9.4003(3) Å, c = 19.8188(7) Å, V = 1610.12(10) Å3, Z = 8, R
gt(F) = 0.0491, wR
ref(F
2) = 0.1347, T = 291(2) K.
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Affiliation(s)
- Xia Mi
- Henan University of Chinese Medicine , Zhengzhou 450046 , P.R. China
| | - Xinling Wang
- Henan University of Chinese Medicine , Zhengzhou 450046 , P.R. China
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49
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Jasiński R. Understanding of the molecular mechanism of the phenylsulfenic acid elimination from nitroalkyl systems. J Mol Graph Model 2019; 89:109-113. [PMID: 30884447 DOI: 10.1016/j.jmgm.2019.03.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 03/06/2019] [Accepted: 03/06/2019] [Indexed: 01/25/2023]
Abstract
The molecular mechanism of the phenylsulfenic acid elimination from nitroalkyl systems has been explored using M06-2X/6-31++G(d,p) theoretical level. It was found that independently of environment polarity as well as degree of screening of nitroalkyl moiety, these types of reactions proceed via one-step, polar mechanism with asynchronous transition state. According to actual state of knowledge this type of the mechanism should not be treated as "pericyclic". Simultaneously, all attempts for localization of stationary structures which can be related to the hypothetical, stepwise mechanism were not successful.
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Affiliation(s)
- Radomir Jasiński
- Department of Organic Chemistry, Cracow University of Technology, Poland.
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50
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Liu S, Gao WC, Miao YH, Wang MC. Dinuclear Zinc-AzePhenol Catalyzed Asymmetric Aza-Henry Reaction of N-Boc Imines and Nitroalkanes under Ambient Conditions. J Org Chem 2019; 84:2652-2659. [PMID: 30707574 DOI: 10.1021/acs.joc.8b02943] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The asymmetric aza-Henry reaction of N-Boc imines and nitroalkanes was realized in the presence of 10 mol % dinuclear zinc-AzePhenol catalysts under ambient conditions. A variety of nitroamines were obtained in good yields (up to 97%) with excellent enantioselectivities (up to 99% ee) and high diasteroselectivity (up to 14:1 dr). Our protocol combined the operational simplicity and mild reaction conditions, thus making the process amenable for technical applications.
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Affiliation(s)
- Shanshan Liu
- Shaanxi Key Laboratory of Chemical Additives for Industry, College of Chemistry and Chemical Engineering , Shaanxi University of Science and Technology , 6 Xuefu Road , Weiyang District, Xi'an , Shaanxi 710021 , P. R. China
| | - Wen-Chao Gao
- College of Chemistry and Pharmaceutical Engineering , Nanyang Normal University , 1638 Wolong Road , Nanyang , Henan 473061 , P. R. China.,The College of Chemistry and Molecular Engineering , Zhengzhou University , No. 75 Daxue Road , Zhengzhou , Henan 450052 , P. R. China
| | - Yu-Hang Miao
- The College of Chemistry and Molecular Engineering , Zhengzhou University , No. 75 Daxue Road , Zhengzhou , Henan 450052 , P. R. China
| | - Min-Can Wang
- The College of Chemistry and Molecular Engineering , Zhengzhou University , No. 75 Daxue Road , Zhengzhou , Henan 450052 , P. R. China
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