1
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Zhu SJ, Hao ZF, Pan Y, Zhou Y, Liu XL, Zhang M, Lei CW. Asymmetric Formal (3 + 2) Cyclocondensation of Coumarin-3-Formylpyrazoles as 3-Carbon Partners with 3-Hydroxyoxindoles via Esterification/Michael Addition Sequence. J Org Chem 2022; 87:15210-15223. [PMID: 36305826 DOI: 10.1021/acs.joc.2c01757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The first enantioselective formal (3 + 2) cyclocondensation involving α,β-unsaturated pyrazoleamides as 3-carbon partners was accomplished in a stepwise fashion. The stepwise esterification/Michael addition sequence is promoted by Zn(OTf)2 and quinine-squaramide derivative, respectively. The protocol enables access to spiro-fused pentacyclic spirooxindoles from coumarin-3-formylpyrazoles and 3-hydroxyoxindoles in good to satisfactory overall yields (up to 91%) with excellent dr (all cases >20:1 dr) and high ee values (up to 99%). Mechanistic investigations contributed to shedding light on the enantioselective event of the process.
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Affiliation(s)
- Shi-Jie Zhu
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, P. R. China
| | - Zhi-Feng Hao
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, P. R. China
| | - Ya Pan
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, P. R. China
| | - Ying Zhou
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, P. R. China
| | - Xiong-Li Liu
- National and Local Joint Engineering Research Center for the Exploitation of Homology Resources of Medicine and Food, Guizhou University, Guiyang 550025, P. R. China
| | - Ming Zhang
- National and Local Joint Engineering Research Center for the Exploitation of Homology Resources of Medicine and Food, Guizhou University, Guiyang 550025, P. R. China
| | - Chuan-Wen Lei
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, P. R. China
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2
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Fritz-Langhals E. Unique Superbase TBD (1,5,7-Triazabicyclo[4.4.0]dec-5-ene): From Catalytic Activity and One-Pot Synthesis to Broader Application in Industrial Chemistry. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.2c00248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elke Fritz-Langhals
- Department of Chemistry, Technical University of Munich (TUM), Lichtenbergstraße 4, D-85747 Garching, Germany
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3
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Huang J, Jiang B, Zhang X, Gao Y, Xu X, Miao Z. Triethyamine‐promoted [5+3] Cycloadditions for Regio‐ and Diastereoselective Synthesis of Functionalized aza‐Bicyclo[3.3.1]alkenones. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | | | | | | | | | - Zhiwei Miao
- Institute of Elemento-Organic Chemistry CHINA
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4
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Zhou Y, Zhou H, Xu J. N-Heterocyclic Carbene-Catalyzed Stereoselective [3 + 2] Cycloaddition of N, N'-Cyclic Azomethine Imines with Aryl Acetaldehydes. J Org Chem 2022; 87:10476-10484. [PMID: 35861147 DOI: 10.1021/acs.joc.2c01064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A highly stereoselective [3 + 2] cycloaddition reaction of N,N'-cyclic azomethine imines with aryl acetaldehydes enabled by a chiral N-heterocyclic carbene catalyst is accomplished, giving efficient access to a plethora of enantioenriched N,N'-bicyclic pyrazolidinones featuring aromatic substituents at the C2 position. The current strategy can be directly conducted on a gram scale, and the product could be further reduced to bicyclic pyrazolidine without loss of enantiopurity.
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Affiliation(s)
- Yipeng Zhou
- Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, P.R. China
| | - Hongwei Zhou
- College of Biological, Chemical Science and Engineering, Jiaxing University, 118 Jiahang Road, Jiaxing 314001, P.R. China
| | - Jianfeng Xu
- Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, P.R. China
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5
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Nikolaeva OG, Popova OS, Dubonosova IV, Karlutova OY, Dubonosov AD, Bren VA, Minkin VI. Spectral-Luminescent and Ionochromic Properties of Azomethine Imine-Coumarin Conjugates. RUSS J GEN CHEM+ 2022. [DOI: 10.1134/s1070363222050139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Xu M, Cao W, Xu X, Ji S. Visible‐Light‐Promoted Radical Cyclization and N−N Bond Cleavage Relay of N‐Aminopyridinium Ylides for Access to 2,3‐Difunctionalized Indoles. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200248] [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)
- Meng‐Meng Xu
- Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 People's Republic of China
| | - Wen‐Bin Cao
- Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 People's Republic of China
| | - Xiao‐Ping Xu
- Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 People's Republic of China
- Innovation Center for Chemical Science Soochow University Suzhou 215123 People's Republic of China
| | - Shun‐Jun Ji
- Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 People's Republic of China
- Suzhou Baolidi Functional Materials Research Institute Suzhou 215144 People's Republic of China
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7
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Cao VD, Kim H, Kwak J, Joung S. (3 + 2) Cycloaddition Reaction of the Endocyclic N-Silyl Enamine and N, N′-Cyclic Azomethine Imine. Org Lett 2022; 24:1974-1978. [DOI: 10.1021/acs.orglett.2c00366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Vinh Do Cao
- Department of Chemistry, Mokpo National University, Muan, Jeonnam 58554, Republic of Korea
| | - Huiae Kim
- Department of Chemistry, Mokpo National University, Muan, Jeonnam 58554, Republic of Korea
| | - Jaesung Kwak
- Infectious Diseases Therapeutic Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Republic of Korea
| | - Seewon Joung
- Department of Chemistry, Mokpo National University, Muan, Jeonnam 58554, Republic of Korea
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8
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Synthesis of pyrazolotetrazepin-7-ones from 1,3,5-triazinanes with N,N′-cyclic azomethine imines via a formal (5 + 2) pathway. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132130] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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9
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Meninno S, Carratù M, Overgaard J, Lattanzi A. Diastereoselective Synthesis of Functionalized 5-Amino-3,4-Dihydro-2H-Pyrrole-2-Carboxylic Acid Esters: One-Pot Approach Using Commercially Available Compounds and Benign Solvents. Chemistry 2021; 27:4573-4577. [PMID: 33464645 DOI: 10.1002/chem.202005262] [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: 12/09/2020] [Revised: 01/18/2021] [Indexed: 11/08/2022]
Abstract
A novel three-step four-transformation approach to highly functionalized 5-amino-3,4-dihydro-2H-pyrrole-2-carboxylic acid esters, starting from commercially available phenylsulfonylacetonitrile, aldehydes, and N-(diphenylmethylene)glycine tert-butyl ester, was developed. The one-pot strategy delivered this class of amidines bearing, for the first time, three contiguous stereocenters, in good to high yield and diastereoselectivity. The entire sequence was carried out using diethyl carbonate and 2-methyl tetrahydrofuran as benign solvents, operating under metal-free conditions. The process could be conveniently scaled-up, and the synthetic utility of the products was demonstrated.
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Affiliation(s)
- Sara Meninno
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, Italy
| | - Mario Carratù
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, Italy
| | - Jacob Overgaard
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus, Denmark
| | - Alessandra Lattanzi
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, Italy
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10
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Chen R, Liu Q, Wang K, Qi Y, Zhou Y, Zhang A, Meng T, Liu L. [5+2] Cyclization of N,N′‐Cyclic Azomethine Imines with 1,3,5‐Triazines: An Efficient Protocol for the Synthesis of Tetrazepine Derivatives. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202000705] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Rongxiang Chen
- School of Pharmacy Xinxiang University 453000 Xinxiang P. R. of China
| | - Qingling Liu
- School of Pharmacy Xinxiang University 453000 Xinxiang P. R. of China
| | - Kai‐Kai Wang
- School of Pharmacy Xinxiang University 453000 Xinxiang P. R. of China
| | - Yonghua Qi
- School of Pharmacy Xinxiang University 453000 Xinxiang P. R. of China
| | - Yong Zhou
- School of International Education Xinxiang University 453000 Xinxiang P. R. of China
| | - An‐an Zhang
- College of Chemistry and Chemical Engineering Shangqiu Normal University 476000 Shangqiu Henan P. R. China
| | - Tuanjie Meng
- College of Chemistry and Chemical Engineering Shangqiu Normal University 476000 Shangqiu Henan P. R. China
| | - Lantao Liu
- College of Chemistry and Chemical Engineering Shangqiu Normal University 476000 Shangqiu Henan P. R. China
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11
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Deepthi A, Thomas NV, Sruthi SL. An overview of the reactions involving azomethine imines over half a decade. NEW J CHEM 2021. [DOI: 10.1039/d1nj01090e] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Azomethine imines constitute a versatile class of 1,3-dipoles which was used extensively for biologically relevant N-heterocycle synthesis – a five-year recap.
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Affiliation(s)
- Ani Deepthi
- Department of Chemistry
- University of Kerala
- Thiruvananthapuram 695581
- India
| | - Noble V. Thomas
- Department of Chemistry
- University of Kerala
- Thiruvananthapuram 695581
- India
| | - S. L. Sruthi
- Department of Chemistry
- University of Kerala
- Thiruvananthapuram 695581
- India
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12
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Molchanov AP, Efremova MM, Kryukova MA, Kuznetsov MA. Selective and reversible 1,3-dipolar cycloaddition of 6-aryl-1,5-diazabicyclo[3.1.0]hexanes with 1,3-diphenylprop-2-en-1-ones under microwave irradiation. Beilstein J Org Chem 2020; 16:2679-2686. [PMID: 33178358 PMCID: PMC7607433 DOI: 10.3762/bjoc.16.218] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Accepted: 10/20/2020] [Indexed: 12/21/2022] Open
Abstract
The first example of the cycloaddition of in situ-generated azomethine imine under microwave conditions is described. The reaction of 6-aryl-1,5-diazabicyclo[3.1.0]hexanes with 1,3-diphenylprop-2-en-1-ones proceeds regio- and stereoselectively giving mostly good yields of the corresponding perhydropyrazolopyrazoles. The products of the reaction undergo cycloreversion under the reaction conditions.
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Affiliation(s)
- Alexander P Molchanov
- Department of Organic Chemistry, Institute of Chemistry, Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
| | - Mariia M Efremova
- Department of Organic Chemistry, Institute of Chemistry, Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
| | - Mariya A Kryukova
- Department of Organic Chemistry, Institute of Chemistry, Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
| | - Mikhail A Kuznetsov
- Department of Organic Chemistry, Institute of Chemistry, Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
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13
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Volpe C, Meninno S, Roselli A, Mancinelli M, Mazzanti A, Lattanzi A. Nitrone/Imine Selectivity Switch in Base‐Catalysed Reaction of Aryl Acetic Acid Esters with Nitrosoarenes: Joint Experimental and Computational Study. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000855] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Chiara Volpe
- Dipartimento di Chimica e Biologia “A. Zambelli” Università di Salerno Via Giovanni Paolo II, 132 84084 Fisciano Italy
| | - Sara Meninno
- Dipartimento di Chimica e Biologia “A. Zambelli” Università di Salerno Via Giovanni Paolo II, 132 84084 Fisciano Italy
| | - Angelo Roselli
- Dipartimento di Chimica e Biologia “A. Zambelli” Università di Salerno Via Giovanni Paolo II, 132 84084 Fisciano Italy
| | - Michele Mancinelli
- Department of Industrial Chemistry “Toso Montanari” University of Bologna Viale Risorgimento 4 40136 Bologna Italy
| | - Andrea Mazzanti
- Department of Industrial Chemistry “Toso Montanari” University of Bologna Viale Risorgimento 4 40136 Bologna Italy
| | - Alessandra Lattanzi
- Dipartimento di Chimica e Biologia “A. Zambelli” Università di Salerno Via Giovanni Paolo II, 132 84084 Fisciano Italy
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14
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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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15
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Yue G, Dou Z, Zhou Z, Zhang L, Feng J, Chen H, Yin Z, Song X, Liang X, Wang X, Rao H, Lu C. Rapid abnormal [3+2]-cycloaddition of isatin N,N′-cyclic azomethine imine 1,3-dipoles with chalcones. NEW J CHEM 2020. [DOI: 10.1039/d0nj00887g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
More than 35 new compounds were prepared rapidly in moderate to excellent yields with high diastereoselectivities by K2CO3-promoted abnormal 1,3-diploar cycloaddition of isatin N, N′-cyclic azomethine imines with chalcones.
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16
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Franco F, Meninno S, Benaglia M, Lattanzi A. Formal α-trifluoromethylthiolation of carboxylic acid derivatives via N-acyl pyrazoles. Chem Commun (Camb) 2020; 56:3073-3076. [DOI: 10.1039/d0cc00116c] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A direct and general one-pot approach to α-trifluoromethylthiolated amides, esters and carboxylic acids has been successfully developed under mild, catalytic and metal-free conditions.
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Affiliation(s)
- Francesca Franco
- Dipartimento di Chimica e Biologia
- Università di Salerno
- Fisciano
- Italy
| | - Sara Meninno
- Dipartimento di Chimica e Biologia
- Università di Salerno
- Fisciano
- Italy
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17
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A Guanidine-Based Superbase as Efficient Chemiluminescence Booster. Sci Rep 2019; 9:14519. [PMID: 31601903 PMCID: PMC6786995 DOI: 10.1038/s41598-019-51105-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 09/25/2019] [Indexed: 12/28/2022] Open
Abstract
We introduce the guanidine-based superbase 1,5,7-triaza-bicyclo-[4.4.0]dec-5-ene (TBD) as efficient enabler for chemiluminescence (CL) based on luminol in a simple, ready-to-use two component system. The strong CL is generated by the superbase’s properties as peroxidase mimetic and bifunctional coreactant. The herein established concept allows for CL enabling molecules (superbases) to be readily implemented in larger molecular structures, including in polymers.
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18
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Fang QY, Jin HS, Wang RB, Zhao LM. DABCO-mediated [3+3] cycloaddition of azomethine imines with in situ generated nitrile oxides from hydroximoyl chlorides. Chem Commun (Camb) 2019; 55:10587-10590. [PMID: 31418760 DOI: 10.1039/c9cc05367k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A novel cross 1,3-dipolar cycloaddition between azomethine imines with in situ generated nitrile oxides has been developed. This is the first example of employing a reaction partner containing two heteroatoms in the [3+3] cycloaddition involving azomethine imines. This strategy not only provides structurally diverse N,O-heterocycles but also greatly enriches the chemistry of azomethine imines and nitrile oxides.
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Affiliation(s)
- Qing-Yun Fang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China.
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19
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Volpe C, Meninno S, Mirra G, Overgaard J, Capobianco A, Lattanzi A. Direct α-Imination of N-Acyl Pyrazoles with Nitrosoarenes. Org Lett 2019; 21:5305-5309. [PMID: 31247764 DOI: 10.1021/acs.orglett.9b01913] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Unprecedented α-imino N-acyl pyrazoles were efficiently and selectively prepared through the 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD)-catalyzed reaction of nitrosoarenes with N-acyl pyrazoles via an N-nitroso aldol reaction/dehydration sequence. The α-imino acyl pyrazoles were demonstrated to be new versatile intermediates for practical one-pot syntheses of α-imino amides, dipeptide precursors, esters, and β-amino alcohols. The synthetic method competes with known protocols in terms of ready availability of the reagents and catalyst, mild and catalytic reaction conditions, gram-scale applicability, and scope of the α-imino acid derivatives achievable.
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Affiliation(s)
- Chiara Volpe
- Dipartimento di Chimica e Biologia , Università di Salerno , Via Giovanni Paolo II 132 , 84084 Fisciano , Italy
| | - Sara Meninno
- Dipartimento di Chimica e Biologia , Università di Salerno , Via Giovanni Paolo II 132 , 84084 Fisciano , Italy
| | - Giulia Mirra
- Dipartimento di Chimica e Biologia , Università di Salerno , Via Giovanni Paolo II 132 , 84084 Fisciano , Italy
| | - Jacob Overgaard
- Department of Chemistry , Aarhus University , Langelandsgade 140 , 8000 Aarhus , Denmark
| | - Amedeo Capobianco
- Dipartimento di Chimica e Biologia , Università di Salerno , Via Giovanni Paolo II 132 , 84084 Fisciano , Italy
| | - Alessandra Lattanzi
- Dipartimento di Chimica e Biologia , Università di Salerno , Via Giovanni Paolo II 132 , 84084 Fisciano , Italy
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