1
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Smith MA, Kang RJD, Kumar R, Roy B, Gaunt MJ. Modular synthesis of α-branched secondary alkylamines via visible-light-mediated carbonyl alkylative amination. Chem Sci 2024:d4sc03916e. [PMID: 39184289 PMCID: PMC11342158 DOI: 10.1039/d4sc03916e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Accepted: 08/16/2024] [Indexed: 08/27/2024] Open
Abstract
The development of methods for the assembly of secondary α-alkyl amines remains a central challenge to chemical synthesis because of their critical importance in modulating the physical properties of biologically active molecules. Despite decades of intensive research, chemists still rely on selective N-alkylation and carbonyl reductive amination to make most amine products. Here we report the further evolution of a carbonyl alkylative amination process that, for the first time, brings together primary amines, aldehydes and alkyl iodides in a visible-light-mediated multicomponent coupling reaction for the synthesis of a wide range of α-branched secondary alkylamines. In addition to exploring the tolerance and limitations in each reaction component, we also report preliminary applications to the telescoped synthesis of α-branched N-heterocycles and an N-alkylation protocol that is selective for primary over cyclic secondary amines. Our data support a mechanism involving addition of an alkyl radical to an uncharged alkyl imine which, to the best of our knowledge, has not previously been described. We believe that this method will enable practitioners of synthetic chemistry in academic and industrial settings to approach the synthesis of these important molecules in a manner that is streamlined compared to established approaches.
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Affiliation(s)
- Milo A Smith
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Ryan J D Kang
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Roopender Kumar
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Biswarup Roy
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Matthew J Gaunt
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
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2
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Li J, Li Y, Wu B, Xie M, Hu Y. Proton Transfer Processes in 2-Butenenitrile Dimer Cation Studied by Mass-Selective Infrared Spectroscopy. J Phys Chem A 2024; 128:4694-4700. [PMID: 38833155 DOI: 10.1021/acs.jpca.4c01989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
2-Butenenitrile (2-Bu) is a recently discovered crucial interstellar molecule. Herein, an abnormal NH band was observed in the infrared spectrum of the 2-Bu dimer cation, suggestive of a proton transfer reaction within the cluster. Through a comprehensive theoretical analysis of the IR spectrum of (2-Bu)2+, we discovered not only the formation of a new C-N bond through the attachment of one 2-Bu to another but also the occurrence of a proton transfer reaction in the cluster. This proton was identified as originating from the methyl group of the attaching 2-Bu in the cluster based on the analysis of IR spectra of (2-Bu)+ and [2-Bu-acrylonitrile (AN)]+. Furthermore, the detailed reaction process of this ion-molecule reaction is examined with theoretical calculation. This finding contributes significantly to our deeper understanding of ion-molecule reactions in the gas phase and the formation of nitrogen-containing prebiotic molecules in the interstellar medium.
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Affiliation(s)
- Jingyu Li
- MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science, Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Yujian Li
- MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science, Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Bingbing Wu
- MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science, Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Min Xie
- MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science, Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Yongjun Hu
- MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science, Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China
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3
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Zhou Z, Sales ZS, Pippel DJ, Qian M, Martin CL. Blue Light-Mediated, Photocatalyst-Free Decarboxylative Alkylation of Heteroaryl Sulfinimines. J Org Chem 2022; 87:14948-14952. [PMID: 36228170 DOI: 10.1021/acs.joc.2c01861] [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
We report a diastereoselective, photocatalyst-free decarboxylative alkylation of (hetero)aryl sulfinimines using redox-active esters under blue light. High yields and diastereoselectivities can be achieved under mild conditions, and we demonstrate its utility as a synthetic method, especially for medicinal chemists.
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Affiliation(s)
- Zhe Zhou
- Discovery Process Research, Janssen Research & Development LLC, 3210 Merryfield Row, San Diego, California 92121, United States
| | - Zachary S Sales
- Discovery Process Research, Janssen Research & Development LLC, 3210 Merryfield Row, San Diego, California 92121, United States
| | - Daniel J Pippel
- Discovery Process Research, Janssen Research & Development LLC, 3210 Merryfield Row, San Diego, California 92121, United States
| | - Michael Qian
- Discovery Chemistry, Janssen Research & Development LLC, 3210 Merryfield Row, San Diego, California 92121, United States
| | - Connor L Martin
- Discovery Process Research, Janssen Research & Development LLC, 3210 Merryfield Row, San Diego, California 92121, United States
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4
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Kancherla R, Muralirajan K, Rueping M. Excited-state palladium-catalysed reductive alkylation of imines: scope and mechanism. Chem Sci 2022; 13:8583-8589. [PMID: 35974758 PMCID: PMC9337745 DOI: 10.1039/d2sc02363f] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 07/01/2022] [Indexed: 11/21/2022] Open
Abstract
Palladium catalysis induced by visible-light irradiation is a promising tool for promoting unusual chemical reactivity. Here, the hybrid alkyl radical/Pd(i) species generated is used to promote the reductive alkylation of imines.
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Affiliation(s)
- Rajesh Kancherla
- KAUST Catalysis Center, KCC, King Abdullah University of Science and Technology, KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Krishnamoorthy Muralirajan
- KAUST Catalysis Center, KCC, King Abdullah University of Science and Technology, KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Magnus Rueping
- KAUST Catalysis Center, KCC, King Abdullah University of Science and Technology, KAUST, Thuwal 23955-6900, Saudi Arabia
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5
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Yamada KI, Fujiwara S, Inokuma T, Sugano M, Yamaoka Y, Takasu K. The rationale for stereoinduction in conjugate addition to alkylidenemalonates bearing a menthol-derived chiral auxiliary. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Qiu X, Xu L, Wang S, Dai Y, Feng Y, Gong C, Tao C. Copper-catalyzed borylative aminomethylation of C-C double and triple bonds with N,O-acetal. Chem Commun (Camb) 2021; 57:3279-3282. [PMID: 33651061 DOI: 10.1039/d1cc00093d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A copper-catalyzed borylaminomethylation of multiple carbon-carbon bonds with N,O-acetal and bis(pinacolato)diboron has been disclosed that offers efficient and expedient access to γ-amino boronates. The products contain a valuable amine and boronate, which are amenable to further elaboration, and have versatile synthetic utilities.
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Affiliation(s)
- Xianfan Qiu
- School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, China.
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7
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Zhou Y, Wu M, Liu Y, Cheng C, Zhu G. Synthesis of Polysubstituted Pyrroles via Silver-Catalyzed Oxidative Radical Addition of Cyclopropanols to Imines. Org Lett 2020; 22:7542-7546. [PMID: 32915585 DOI: 10.1021/acs.orglett.0c02735] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A silver-catalyzed formal [3 + 2] cycloaddition reaction, with cyclopropanols as a C3 subunit and imines as a two-atom subunit, is developed. The reaction takes place under mild conditions and produces a broad array of polysubstituted pyrroles in medium to high yields. It represents the first example of oxidative radical addition to imines, thus offering a new choice for the direct C-H functionalization of imines.
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Affiliation(s)
- Yulu Zhou
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, 688 Yingbin Road, Jinhua 321004, P.R. China
| | - Mingchang Wu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, 688 Yingbin Road, Jinhua 321004, P.R. China
| | - Yi Liu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, 688 Yingbin Road, Jinhua 321004, P.R. China
| | - Cungui Cheng
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, 688 Yingbin Road, Jinhua 321004, P.R. China
| | - Gangguo Zhu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, 688 Yingbin Road, Jinhua 321004, P.R. China
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8
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Cullen STJ, Friestad GK. Alkyl Radical Addition to Aliphatic and Aromatic N-Acylhydrazones Using an Organic Photoredox Catalyst. Org Lett 2019; 21:8290-8294. [PMID: 31560554 PMCID: PMC6900872 DOI: 10.1021/acs.orglett.9b03053] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Increased versatility of intermolecular radical addition to imino acceptors via photoredox catalysis is reported. Primary and secondary radicals, generated via visible-light photocatalysis from alkyl biscatecholatosilicates with organocatalyst 4CzIPN, add successfully to both aromatic and aliphatic N-acylhydrazones in the presence of MgCl2. With N-benzoylhydrazones, a simple reductive cleavage of the N-N bond of the hydrazine adduct furnishes the free amine. Synthetic utility is exemplified in a synthetic application toward repaglinide, a clinically important hypoglycemic agent.
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Affiliation(s)
- Stephen T. J. Cullen
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Gregory K. Friestad
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
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9
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Ostacolo C, Di Sarno V, Musella S, Ciaglia T, Vestuto V, Pepe G, Merciai F, Campiglia P, Gomez Monterrey IM, Bertamino A. An Efficient Approach to Aromatic Aminomethylation Using Dichloromethane as Methylene Source. Front Chem 2019; 7:568. [PMID: 31457005 PMCID: PMC6700257 DOI: 10.3389/fchem.2019.00568] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 07/26/2019] [Indexed: 01/30/2023] Open
Abstract
Ultrasound-promoted N-aminomethylation of indoles can be achieved in basic medium using sodium hydride and dichloromethane (DCM) as C1 donor source. This innovative amino methylation protocol results in good to excellent yields of multifunctional indole derivatives. The procedure is also applicable to other aza-heterocyclic compounds and, interestingly, affords direct access to aminomethyl-substituted aryl alcohols.
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Affiliation(s)
- Carmine Ostacolo
- Department of Pharmacy, University of Naples "Federico II", Naples, Italy
| | | | | | - Tania Ciaglia
- Department of Pharmacy, University of Salerno, Fisciano, Italy
| | | | - Giacomo Pepe
- Department of Pharmacy, University of Salerno, Fisciano, Italy
| | | | - Pietro Campiglia
- Department of Pharmacy, University of Salerno, Fisciano, Italy.,Fondazione EBRIS, Salerno, Italy
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10
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Yi J, Badir SO, Alam R, Molander GA. Photoredox-Catalyzed Multicomponent Petasis Reaction with Alkyltrifluoroborates. Org Lett 2019; 21:4853-4858. [PMID: 31145628 DOI: 10.1021/acs.orglett.9b01747] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A redox-neutral alkyl Petasis reaction has been developed that proceeds via photoredox catalysis. A diverse set of primary, secondary, and tertiary alkyltrifluoroborates participate effectively in this reaction through a single-electron transfer mechanism, in contrast to the traditional two-electron Petasis reaction, which accommodates only unsaturated boronic acids. This protocol is ideal to diversify benzyl-type and glyoxalate-derived aldehydes, anilines, and alkyltrifluoroborates toward the rapid assembly of libraries of higher molecular complexity important in pharmaceutical and agrochemical settings.
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Affiliation(s)
- Jun Yi
- Roy and Diana Vagelos Laboratories, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States.,Jiangsu Laboratory of Advanced Functional Materials, School of Chemistry and Materials Engineering , Changshu Institute of Technology , Changshu 215500 , China
| | - Shorouk O Badir
- Roy and Diana Vagelos Laboratories, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
| | - Rauful Alam
- Roy and Diana Vagelos Laboratories, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
| | - Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
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11
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Kang Z, Wang Y, Zhang D, Wu R, Xu X, Hu W. Asymmetric Counter-Anion-Directed Aminomethylation: Synthesis of Chiral β-Amino Acids via Trapping of an Enol Intermediate. J Am Chem Soc 2019; 141:1473-1478. [DOI: 10.1021/jacs.8b12832] [Citation(s) in RCA: 91] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Zhenghui Kang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
- Shanghai Engineering
Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
| | - Yongheng Wang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Dan Zhang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Ruibo Wu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Xinfang Xu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
| | - Wenhao Hu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
- Shanghai Engineering
Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
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12
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Kim JH, Jang DO. One-pot synthesis of hydrazine derivatives from aldehydes via radical addition reactions. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.06.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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13
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Sakamoto R, Tomomi Yoshii, Takada H, Maruoka K. A Synthetic Route to Sodium α-Aminoalkanesulfinates and Their Application in the Generation of α-Aminoalkyl Radicals for Radical Addition Reactions. Org Lett 2018; 20:2080-2083. [PMID: 29569931 DOI: 10.1021/acs.orglett.8b00621] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The synthesis of sodium α-aminoalkanesulfinates and their synthetic utility as α-aminoalkyl radical precursors are reported. A variety of α-aminoalkanesulfinates were readily obtained from the reaction between the anions of N-Boc-protected alkylamines and 1,4-diazabicyclo[2.2.2]octanebis(sulfur dioxide). Treatment of sodium α-aminoalkanesulfinates with (diacetoxyiodo)benzene easily generated the corresponding α-aminoalkyl radicals under mild conditions, which were then applied in radical 1,2-addition to imines, radical 1,4-addition to electron-deficient olefins, and radical addition/cyclization to 2-isocyanobiphenyls.
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Affiliation(s)
- Ryu Sakamoto
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo, Kyoto 606-8502 , Japan
| | - Tomomi Yoshii
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo, Kyoto 606-8502 , Japan
| | - Hiroyuki Takada
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo, Kyoto 606-8502 , Japan
| | - Keiji Maruoka
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo, Kyoto 606-8502 , Japan.,School of Chemical Engineering and Light Industry , Guangdong University of Technology , No. 100 West Waihuan Road, HEMC, 4 Panyu District , Guangzhou 510006 , China
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14
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Hsu CW, Sundén H. α-Aminoalkyl Radical Addition to Maleimides via Electron Donor–Acceptor Complexes. Org Lett 2018; 20:2051-2054. [DOI: 10.1021/acs.orglett.8b00597] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chien-Wei Hsu
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Kemivägen 10, 41296 Göteborg, Sweden
| | - Henrik Sundén
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Kemivägen 10, 41296 Göteborg, Sweden
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15
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Zhang HH, Yu S. Radical Alkylation of Imines with 4-Alkyl-1,4-dihydropyridines Enabled by Photoredox/Brønsted Acid Cocatalysis. J Org Chem 2017; 82:9995-10006. [DOI: 10.1021/acs.joc.7b01425] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Hong-Hao Zhang
- State Key Laboratory of Analytical
Chemistry for Life Science, Jiangsu Key Laboratory of Advanced Organic
Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Shouyun Yu
- State Key Laboratory of Analytical
Chemistry for Life Science, Jiangsu Key Laboratory of Advanced Organic
Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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16
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Patel NR, Kelly CB, Siegenfeld AP, Molander GA. Mild, Redox-Neutral Alkylation of Imines Enabled by an Organic Photocatalyst. ACS Catal 2017; 7:1766-1770. [PMID: 28367354 PMCID: PMC5369175 DOI: 10.1021/acscatal.6b03665] [Citation(s) in RCA: 119] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Revised: 01/27/2017] [Indexed: 12/02/2022]
Abstract
![]()
An operationally simple, mild, redox-neutral
method for the photoredox
alkylation of imines is reported. Utilizing an inexpensive organic
photoredox catalyst, alkyl radicals are readily generated from the
single-electron oxidation of ammonium alkyl bis(catecholato)silicates
and are subsequently engaged in a C–C bond-forming reaction
with imines. The process is highly selective, metal-free, and does
not require a large excess of the alkylating reagent or the use of
acidic additives.
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Affiliation(s)
- Niki R. Patel
- Roy and Diana Vagelos Laboratories,
Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Christopher B. Kelly
- Roy and Diana Vagelos Laboratories,
Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Allison P. Siegenfeld
- Roy and Diana Vagelos Laboratories,
Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Gary A. Molander
- Roy and Diana Vagelos Laboratories,
Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
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17
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Reddy MD, Fronczek FR, Watkins EB. Rh-Catalyzed, Regioselective, C–H Bond Functionalization: Access to Quinoline-Branched Amines and Dimers. Org Lett 2016; 18:5620-5623. [DOI: 10.1021/acs.orglett.6b02848] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- M. Damoder Reddy
- Department
of Pharmaceutical Sciences, School of Pharmacy, Union University, 1050
Union University Drive, Jackson, Tennessee 38305, United States
| | - Frank R. Fronczek
- Department
of Chemistry, Louisiana State University, 608 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - E. Blake Watkins
- Department
of Pharmaceutical Sciences, School of Pharmacy, Union University, 1050
Union University Drive, Jackson, Tennessee 38305, United States
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18
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Yamada KI, Matsumoto Y, Fujii S, Konishi T, Yamaoka Y, Takasu K. Striking Difference between Succinimidomethyl and Phthalimidomethyl Radicals in Conjugate Addition to Alkylidenemalonate Initiated by Dimethylzinc. J Org Chem 2016; 81:3809-17. [DOI: 10.1021/acs.joc.6b00485] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ken-ichi Yamada
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yusuke Matsumoto
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Shintaro Fujii
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Takehito Konishi
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical
Sciences, Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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19
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Friestad GK, Banerjee K, Marié JC, Mali U, Yao L. Stereoselective access to tubuphenylalanine and tubuvaline: improved Mn-mediated radical additions and assembly of a tubulysin tetrapeptide analog. J Antibiot (Tokyo) 2016; 69:294-8. [PMID: 26883395 PMCID: PMC4924578 DOI: 10.1038/ja.2016.7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 01/12/2016] [Accepted: 01/18/2016] [Indexed: 01/05/2023]
Abstract
Synthesis of tubuphenylalanine and tubuvaline (Tuv), α-substituted γ-amino acid building blocks for tubulysin family of antimitotic compounds, has been improved using a radical addition reaction in the presence of unprotected hydroxyl functionality. The key carbon-carbon bond construction entails stereoselective Mn-mediated photolytic additions of alkyl iodides to the C=N bond of chiral N-acylhydrazones, and generates the chiral amines in high yield with complete stereocontrol. Reductive N-N bond cleavage and alcohol oxidation converted these amino alcohols into the corresponding γ-amino acids. The route to Tuv proceeded via peptide coupling with serine methyl ester, followed by a high-yielding sequence to convert the serine amide to a thiazole. Finally, peptide bond construction established the tubulysin framework in the form of a C-terminal alcohol analog. Attempted oxidation to the C-terminal carboxylate was unsuccessful; control experiments with dipeptide 18 showed a cyclization interfered with the desired oxidation process.
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Affiliation(s)
| | - Koushik Banerjee
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242 USA
| | | | - Umesh Mali
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242 USA
| | - Lei Yao
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242 USA
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20
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Affiliation(s)
- Ken-ichi Yamada
- Graduate School of Pharmaceutical Sciences; Kyoto University; Kyoto Japan
| | - Kiyoshi Tomioka
- Department of Medicinal Chemistry; Faculty of Pharmaceutical Sciences; Doshisha Women's College of Liberal Arts; Kyoto Japan
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21
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Slater KA, Friestad GK. Mn-Mediated Radical-Ionic Annulations of Chiral N-Acylhydrazones. J Org Chem 2015; 80:6432-40. [DOI: 10.1021/acs.joc.5b00863] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kara A. Slater
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Gregory K. Friestad
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
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Fujii S, Nakano M, Yamaoka Y, Takasu K, Yamada KI, Tomioka K. Contiguous radical pivaloyloxymethylation–directed C(sp 3 )–H iodination of N -tosyl cycloalkanecarbaldimine. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.11.105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Han S, Zard SZ. Stabilization of Radicals by Imides. A Modular Stereoselective Approach to Protected Functional 1,2-Diamines. Org Lett 2014; 16:5386-9. [DOI: 10.1021/ol502599r] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Songzhe Han
- Laboratoire
de Synthèse
Organique, UMR 7652 CNRS/Ecole Polytechnique, 91128 Palaiseau
Cedex, France
| | - Samir Z. Zard
- Laboratoire
de Synthèse
Organique, UMR 7652 CNRS/Ecole Polytechnique, 91128 Palaiseau
Cedex, France
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