1
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Hu WB, Song X, Wang MC. A new asymmetric activation strategy for hydrazones as acyl anion equivalents in the bimetallic catalyzed carbonyl-ene reaction. Org Biomol Chem 2021; 19:2055-2062. [PMID: 33599668 DOI: 10.1039/d1ob00017a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new asymmetric activation strategy for hydrazones as acyl anion equivalents is developed in the bimetallic catalyzed carbonyl-ene reaction of isatins and hydrazones. Under mild conditions, optically active functionalized 3-hydroxy-2-oxindoles were furnished in up to 98% yield with up to 97% enantioselectivity. In this process, formaldehyde tert-butylhydrazone which is seldom employed in asymmetric carbonyl-ene reactions accelerated by a metallic catalyst can be activated well by a Brønsted base. A possible catalytic cycle is proposed.
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Affiliation(s)
- Wen-Bo Hu
- The College of Chemistry and Molecular Engineering, Zhengzhou University, 75 Daxue Road, Zhengzhou, Henan 450052, P. R. China.
| | - Xixi Song
- The College of Chemistry and Molecular Engineering, Zhengzhou University, 75 Daxue Road, Zhengzhou, Henan 450052, P. R. China.
| | - Min-Can Wang
- The College of Chemistry and Molecular Engineering, Zhengzhou University, 75 Daxue Road, Zhengzhou, Henan 450052, P. R. China.
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2
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Lu Z, Hennis O, Gentry J, Xu B, Hammond GB. Base-Promoted Radical Azofluoromethylation of Unactivated Alkenes. Org Lett 2020; 22:4383-4388. [PMID: 32400165 DOI: 10.1021/acs.orglett.0c01395] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The base-induced reaction of aryl diazonium salts with commercially available CF3SO2Na/CF2HSO2Na allows for the generation of the corresponding diazene radicals along with fluoromethyl radicals. The addition of fluoromethyl radicals to alkenes with subsequent diazene trapping provides the azofluoromethylation products in good to excellent yields. This metal-free method under mild reaction conditions has broad functional group compatibility and is applicable in the late-stage modification of various natural products and bioactive molecules.
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Affiliation(s)
- Zhichao Lu
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Olivia Hennis
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Joseph Gentry
- Williams College, Williamstown, Massachusetts 01267, United States
| | - Bo Xu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Lu, Shanghai 201620, China
| | - Gerald B Hammond
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
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3
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Angnes RA, Potnis C, Liang S, Correia CRD, Hammond GB. Photoredox-Catalyzed Synthesis of Alkylaryldiazenes: Formal Deformylative C-N Bond Formation with Alkyl Radicals. J Org Chem 2020; 85:4153-4164. [PMID: 32056435 DOI: 10.1021/acs.joc.9b03341] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Diazenes are valuable compounds that have found broad applicability because of their optical and biological properties. We report the synthesis of alkylaryldiazenes via formal, photoredox-catalyzed, deformylative C-N bond formation. The procedure employs dihydropyridines for the generation of alkyl radicals, which are then trapped by diazonium salts and reduced to the corresponding diazenes. Control experiments were performed to confirm the involvement of radicals in the mechanism. The reaction can be carried out at room temperature and employs readily available reagents; the mild conditions allowed the use of highly functionalized substrates. There was no observed tautomerization of the diazenes to the corresponding arylhydrazones.
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Affiliation(s)
- Ricardo A Angnes
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States.,Chemistry Institute, University of Campinas, C.P. 6154, CEP 13083-970 Campinas, São Paulo, Brazil
| | - Chinmay Potnis
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Shengzong Liang
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Carlos Roque D Correia
- Chemistry Institute, University of Campinas, C.P. 6154, CEP 13083-970 Campinas, São Paulo, Brazil
| | - Gerald B Hammond
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
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4
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Chen HX, Li Y, He X, Zhang Y, He W, Liang H, Zhang Y, Jiang X, Chen X, Cao R, Liu GF, Qiu L. Unexpected Brønsted Acid-Catalyzed Domino Reaction of 3-Hydroxyisoindolin-1-ones and N
-tert
-Butyl Hydrazones for the Synthesis of 3-(Hydrazono)isoindolin-1-ones. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801293] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Hui-Xuan Chen
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Yongsu Li
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Xuefeng He
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Yaqi Zhang
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Wenhuan He
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Hao Liang
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Yuyang Zhang
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Xiaoding Jiang
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Xiangmeng Chen
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Rihui Cao
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Gao-Feng Liu
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
| | - Liqin Qiu
- School of Chemistry; The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center; Guangdong Engineering Research Center of Chiral Drugs; Sun Yat-Sen University; Guangzhou People's Republic of China
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5
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Carmona JA, Gonzalo GD, Serrano I, Crespo-Peña AM, Šimek M, Monge D, Fernández R, Lassaletta JM. Asymmetric organocatalytic synthesis of tertiary azomethyl alcohols: key intermediates towards azoxy compounds and α-hydroxy-β-amino esters. Org Biomol Chem 2018; 15:2993-3005. [PMID: 28294261 DOI: 10.1039/c7ob00308k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of peracylated glycosamine-derived thioureas have been synthesized and their behavior as bifunctional organocatalysts has been tested in the enantioselective nucleophilic addition of formaldehyde tert-butyl hydrazone to aliphatic α-keto esters for the synthesis of tertiary azomethyl alcohols. Using the 1,3,4,6-tetra-O-acetyl-2-amino-2-deoxy-β-d-glucosamine derived 3,5-bis-(trifluoromethyl)phenyl thiourea the reaction could be accomplished with high yields (75-98%) and moderate enantioselectivities (50-64% ee). Subsequent high-yielding and racemization-free tranformations of both aromatic- and aliphatic-substituted diazene products in a one pot fashion provide a direct entry to valuable azoxy compounds and α-hydroxy-β-amino esters.
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Affiliation(s)
- José A Carmona
- Instituto de Investigaciones Químicas (CSIC-US) and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Avda. Américo Vespucio, 49, 41092 Sevilla, Spain.
| | - Gonzalo de Gonzalo
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González, 1, 41012 Sevilla, Spain.
| | - Inmaculada Serrano
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González, 1, 41012 Sevilla, Spain.
| | - Ana M Crespo-Peña
- Instituto de Investigaciones Químicas (CSIC-US) and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Avda. Américo Vespucio, 49, 41092 Sevilla, Spain.
| | - Michal Šimek
- Instituto de Investigaciones Químicas (CSIC-US) and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Avda. Américo Vespucio, 49, 41092 Sevilla, Spain.
| | - David Monge
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González, 1, 41012 Sevilla, Spain.
| | - Rosario Fernández
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González, 1, 41012 Sevilla, Spain.
| | - José M Lassaletta
- Instituto de Investigaciones Químicas (CSIC-US) and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Avda. Américo Vespucio, 49, 41092 Sevilla, Spain.
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6
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Zabaleta N, Uria U, Reyes E, Carrillo L, Vicario JL. Ion-pairing catalysis in the enantioselective addition of hydrazones to N-acyldihydropyrrole derivatives. Chem Commun (Camb) 2018; 54:8905-8908. [DOI: 10.1039/c8cc05311a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Quaternary N-acyliminium salts generated from dihydropyrrole derivatives under Brønsted acid catalysis react with hydrazones, the latter participating as masked nucleophilic acyl anion equivalents.
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Affiliation(s)
- Nagore Zabaleta
- Department of Organic Chemistry II
- University of the Basque Country (UPV/EHU)
- Bilbao 48080
- Spain
| | - Uxue Uria
- Department of Organic Chemistry II
- University of the Basque Country (UPV/EHU)
- Bilbao 48080
- Spain
| | - Efraim Reyes
- Department of Organic Chemistry II
- University of the Basque Country (UPV/EHU)
- Bilbao 48080
- Spain
| | - Luisa Carrillo
- Department of Organic Chemistry II
- University of the Basque Country (UPV/EHU)
- Bilbao 48080
- Spain
| | - Jose L. Vicario
- Department of Organic Chemistry II
- University of the Basque Country (UPV/EHU)
- Bilbao 48080
- Spain
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7
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Jiang H, Chen Y, Chen B, Xu H, Wan W, Deng H, Ma K, Wu S, Hao J. Ag-Initiated gem-Difluoromethylenation of the Nitrogen Center of Arenediazonium Salts to gem-Difluoromethylene Azo Compounds. Org Lett 2017; 19:2406-2409. [PMID: 28430453 DOI: 10.1021/acs.orglett.7b00936] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Haizhen Jiang
- Department
of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai, 200444, P. R. China
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic
Chemistry, Chinese Academy of Sciences, Shanghai, 200032, P. R. China
| | - Yunrong Chen
- Department
of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai, 200444, P. R. China
| | - Bo Chen
- Department
of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai, 200444, P. R. China
| | - Hui Xu
- Department
of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai, 200444, P. R. China
| | - Wen Wan
- Department
of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai, 200444, P. R. China
| | - Hongmei Deng
- Laboratory
for Microstructures, Shanghai University, Shanghai, 200444, P. R. China
| | - Kesen Ma
- Department
of Biology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
| | - Shaoxiong Wu
- Emory
NMR Research Center, Emory University, 201 Dowman Drive, Atlanta, Georgia 30322, United States
| | - Jian Hao
- Department
of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai, 200444, P. R. China
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8
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Wang Y, Wang Q, Zhu J. Organocatalytic Nucleophilic Addition of Hydrazones to Imines: Synthesis of Enantioenriched Vicinal Diamines. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702295] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Yang Wang
- Laboratory of Synthesis and Natural Products; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; EPFL-SB-ISIC-LSPN, BCH 5304 1015 Lausanne Switzerland
| | - Qian Wang
- Laboratory of Synthesis and Natural Products; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; EPFL-SB-ISIC-LSPN, BCH 5304 1015 Lausanne Switzerland
| | - Jieping Zhu
- Laboratory of Synthesis and Natural Products; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; EPFL-SB-ISIC-LSPN, BCH 5304 1015 Lausanne Switzerland
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9
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Wang Y, Wang Q, Zhu J. Organocatalytic Nucleophilic Addition of Hydrazones to Imines: Synthesis of Enantioenriched Vicinal Diamines. Angew Chem Int Ed Engl 2017; 56:5612-5615. [DOI: 10.1002/anie.201702295] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Yang Wang
- Laboratory of Synthesis and Natural Products; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; EPFL-SB-ISIC-LSPN, BCH 5304 1015 Lausanne Switzerland
| | - Qian Wang
- Laboratory of Synthesis and Natural Products; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; EPFL-SB-ISIC-LSPN, BCH 5304 1015 Lausanne Switzerland
| | - Jieping Zhu
- Laboratory of Synthesis and Natural Products; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; EPFL-SB-ISIC-LSPN, BCH 5304 1015 Lausanne Switzerland
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10
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de Gracia Retamosa M, Matador E, Monge D, Lassaletta JM, Fernández R. Hydrazones as Singular Reagents in Asymmetric Organocatalysis. Chemistry 2016; 22:13430-45. [DOI: 10.1002/chem.201602430] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Indexed: 01/01/2023]
Affiliation(s)
- María de Gracia Retamosa
- Instituto de Investigaciones Químicas (CSIC-US) and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Avda. Américo Vespucio, 49 41092 Sevilla Spain)
| | - Esteban Matador
- Departamento de Química Orgánica; Universidad de Sevilla and Centro de Innovación Avanzada (ORFEO-CINQA); C/Prof. García González, 1 41012 Sevilla Spain
| | - David Monge
- Departamento de Química Orgánica; Universidad de Sevilla and Centro de Innovación Avanzada (ORFEO-CINQA); C/Prof. García González, 1 41012 Sevilla Spain
| | - José M. Lassaletta
- Instituto de Investigaciones Químicas (CSIC-US) and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Avda. Américo Vespucio, 49 41092 Sevilla Spain)
| | - Rosario Fernández
- Departamento de Química Orgánica; Universidad de Sevilla and Centro de Innovación Avanzada (ORFEO-CINQA); C/Prof. García González, 1 41012 Sevilla Spain
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11
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Prieto A, Bouyssi D, Monteiro N. Copper-Catalyzed Trifluoromethylation of Hydrazones Leading to the Formation of Quaternary α-Trifluoromethyl Diazenes. ASIAN J ORG CHEM 2016. [DOI: 10.1002/ajoc.201600160] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Alexis Prieto
- Université Lyon 1; Institut de Chimie et Biochimie Moléculaires et Supramoléculaires; CPE Lyon; 43, Boulevard du 11 Novembre 1918 69622 Villeurbanne France
| | - Didier Bouyssi
- Université Lyon 1; Institut de Chimie et Biochimie Moléculaires et Supramoléculaires; CPE Lyon; 43, Boulevard du 11 Novembre 1918 69622 Villeurbanne France
| | - Nuno Monteiro
- Université Lyon 1; Institut de Chimie et Biochimie Moléculaires et Supramoléculaires; CPE Lyon; 43, Boulevard du 11 Novembre 1918 69622 Villeurbanne France
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12
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Mantenuto S, Mantellini F, Favi G, Attanasi OA. Divergent Construction of Pyrazoles via Michael Addition of N-Arylhydrazones to 1,2-Diaza-1,3-dienes. Org Lett 2015; 17:2014-7. [DOI: 10.1021/acs.orglett.5b00776] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Serena Mantenuto
- Department of Biomolecular
Sciences, Section of Organic Chemistry and Organic Natural Compounds, University of Urbino “Carlo Bo”, Via I Maggetti 24, 61029 Urbino PU, Italy
| | - Fabio Mantellini
- Department of Biomolecular
Sciences, Section of Organic Chemistry and Organic Natural Compounds, University of Urbino “Carlo Bo”, Via I Maggetti 24, 61029 Urbino PU, Italy
| | - Gianfranco Favi
- Department of Biomolecular
Sciences, Section of Organic Chemistry and Organic Natural Compounds, University of Urbino “Carlo Bo”, Via I Maggetti 24, 61029 Urbino PU, Italy
| | - Orazio A. Attanasi
- Department of Biomolecular
Sciences, Section of Organic Chemistry and Organic Natural Compounds, University of Urbino “Carlo Bo”, Via I Maggetti 24, 61029 Urbino PU, Italy
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13
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Jakhar A, Sadhukhan A, Khan NUH, Saravanan S, Kureshy RI, Abdi SHR, Bajaj HC. Asymmetric Hydrocyanation of Nitroolefins Catalyzed by an Aluminum(III) Salen Complex. ChemCatChem 2014. [DOI: 10.1002/cctc.201402373] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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14
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Yang HB, Zhao YZ, Sang R, Shi M. (DHQ)2AQN-Catalyzed Asymmetric Substitution of Isatin-Derived Hydrazones with O-Boc-Protected Morita–Baylis–Hillman Adducts: A Strategy for Synthesizing Enantioenriched Azo Compounds Incorporating an Oxindole Scaffold. J Org Chem 2014; 79:3519-28. [DOI: 10.1021/jo5003246] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Hai-Bin Yang
- State Key Laboratory
of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Yun-Zhou Zhao
- State Key Laboratory
of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Rui Sang
- State Key Laboratory
of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Min Shi
- State Key Laboratory
of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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15
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Tang HT, Zhou YB, Zhu Y, Sun HC, Lin M, Zhan ZP. Base-Catalyzed NN Bond Cleavage of Hydrazones: Synthesis of α-Amino Ketones. Chem Asian J 2014; 9:1278-81. [DOI: 10.1002/asia.201400037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 01/17/2014] [Indexed: 12/12/2022]
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16
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Highly enantioselective Michael addition of 1,3-dicarbonyl compounds to nitroalkenes catalyzed by designer chiral BINOL–quinine–squaramide: efficient access to optically active nitro-alkanes and their isoxazole derivatives. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2013.08.010] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Monge D, Crespo-Peña AM, Martín-Zamora E, Álvarez E, Fernández R, Lassaletta JM. Dual organocatalytic activation of isatins and formaldehyde tert-butyl hydrazone: asymmetric synthesis of functionalized 3-hydroxy-2-oxindoles. Chemistry 2013; 19:8421-5. [PMID: 23670976 DOI: 10.1002/chem.201301351] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Indexed: 11/07/2022]
Abstract
Two is better than one! Dual activation of isatins and formaldehyde tert-butyl hydrazone by 2,2'-diamino-1,1'-binaphthalene (BINAM)-derived bis(ureas) is the key to achieve high reactivity and excellent enantioselectivities in the synthesis of azo- and azoxy-functionalized 3-hydroxy-2-oxindoles (see scheme).
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Affiliation(s)
- David Monge
- Departamento de Química Orgánica, Universidad de Sevilla, C/Prof. García González, 1, 41012 Sevilla, Spain
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18
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Martínez-Muñoz A, Monge D, Martín-Zamora E, Marqués-López E, Álvarez E, Fernández R, Lassaletta JM. Asymmetric organocatalytic Strecker-type reactions of aliphatic N,N-dialkylhydrazones. Org Biomol Chem 2013; 11:8247-55. [DOI: 10.1039/c3ob41437j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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