1
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Kim S, Park B, Lee GS, Hong SH. Synthesis of α-Aminoacetals via Decarboxylative Coupling of Imine and 2,2,-Diethoxyacetic Acid. J Org Chem 2022; 88:6532-6537. [DOI: 10.1021/acs.joc.2c01941] [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)
- Seoksun Kim
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Beomsoon Park
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Geun Seok Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Soon Hyeok Hong
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
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2
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Mondal S, Dumur F, Gigmes D, Sibi MP, Bertrand MP, Nechab M. Enantioselective Radical Reactions Using Chiral Catalysts. Chem Rev 2022; 122:5842-5976. [DOI: 10.1021/acs.chemrev.1c00582] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Shovan Mondal
- Department of Chemistry, Syamsundar College, Shyamsundar 713424, West Bengal, India
| | - Frédéric Dumur
- Aix Marseille Univ, CNRS, Institut de Chimie Radicalaire UMR 7273, F-13390e Marseille, France
| | - Didier Gigmes
- Aix Marseille Univ, CNRS, Institut de Chimie Radicalaire UMR 7273, F-13390e Marseille, France
| | - Mukund P. Sibi
- Department of Chemistry and Biochemistry North Dakota State University, Fargo, North Dakota 58108, United States
| | - Michèle P. Bertrand
- Aix Marseille Univ, CNRS, Institut de Chimie Radicalaire UMR 7273, F-13390e Marseille, France
| | - Malek Nechab
- Aix Marseille Univ, CNRS, Institut de Chimie Radicalaire UMR 7273, F-13390e Marseille, France
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3
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Li M, Banerjee K, Friestad GK. Diastereocontrol in Radical Addition to β-Benzyloxy Hydrazones: Revised Approach to Tubuvaline and Synthesis of O-Benzyltubulysin V Benzyl Ester. J Org Chem 2021; 86:15139-15152. [PMID: 34636574 PMCID: PMC8576829 DOI: 10.1021/acs.joc.1c01798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Indexed: 11/29/2022]
Abstract
Radical addition to chiral N-acylhydrazones has generated unusual amino acids tubuphenylalanine (Tup) and tubuvaline (Tuv) that are structural components of the tubulysin family of picomolar antimitotic agents and previously led to a tubulysin tetrapeptide analog with a C-terminal alcohol. To improve efficiency in this synthetic route to tubulysins, and to address difficulties in oxidation of the C-terminal alcohol, here we present two alternative routes to Tuv that (a) improve step economy, (b) provide modified conditions for Mn-mediated radical addition in the presence of aromatic heterocycles, and (c) expose an example of double diastereocontrol in radical addition to a β-benzyloxyhydrazone with broader implications for asymmetric amine synthesis via radical addition. An efficient coupling sequence affords 11-O-benzyltubulysin V benzyl ester.
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Affiliation(s)
- Manshu Li
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Koushik Banerjee
- 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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4
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Weigel WK, Dang HT, Yang HB, Martin DBC. Synthesis of amino-diamondoid pharmacophores via photocatalytic C-H aminoalkylation. Chem Commun (Camb) 2020; 56:9699-9702. [PMID: 32699866 PMCID: PMC7442722 DOI: 10.1039/d0cc02804e] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a direct C-H aminoalkylation reaction using two light-activated H-atom transfer catalyst systems that enable the introduction of protected amines to native adamantane scaffolds with C-C bond formation. The scope of adamantane and imine reaction partners is broad and deprotection provides versatile amine and amino acid building blocks. Using readily available chiral imines, the enantioselective synthesis of the saxagliptin core and rimantadine derivatives is also described.
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Affiliation(s)
- William K Weigel
- Department of Chemistry, University of California Riverside, Riverside, California 92521, USA and Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USA.
| | - Hoang T Dang
- Department of Chemistry, University of California Riverside, Riverside, California 92521, USA and Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USA.
| | - Hai-Bin Yang
- Department of Chemistry, University of California Riverside, Riverside, California 92521, USA
| | - David B C Martin
- Department of Chemistry, University of California Riverside, Riverside, California 92521, USA and Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USA.
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5
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Wang J, Shao Z, Tan K, Tang R, Zhou Q, Xu M, Li YM, Shen Y. Synthesis of Amino Acids by Base-Enhanced Photoredox Decarboxylative Alkylation of Aldimines. J Org Chem 2020; 85:9944-9954. [DOI: 10.1021/acs.joc.0c01246] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Jiancheng Wang
- Center for Pharmaceutical Sciences and Engineering, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Ziyan Shao
- Center for Pharmaceutical Sciences and Engineering, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Kai Tan
- Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Rui Tang
- Center for Pharmaceutical Sciences and Engineering, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Qingli Zhou
- Center for Pharmaceutical Sciences and Engineering, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Min Xu
- Center for Pharmaceutical Sciences and Engineering, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Ya-Min Li
- Center for Pharmaceutical Sciences and Engineering, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Yuehai Shen
- Center for Pharmaceutical Sciences and Engineering, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
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6
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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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7
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Tang R, Shao Z, Wang J, Liu Z, Li YM, Shen Y. Iron(II)-Catalyzed Radical Addition to Aldimines with Hantzsch Ester as a Two-Hydrogen Atom Donor. J Org Chem 2019; 84:8177-8184. [PMID: 31122013 DOI: 10.1021/acs.joc.9b01163] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The first Fe(OTf)2-catalyzed radical addition to aldimines with Hantzsch ester as a two-hydrogen atom donor is reported. The tin-free reaction works well for electron-deficient substrates and provides a potentially useful approach to α-branched amines and α-amino acids.
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Affiliation(s)
- Rui Tang
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
| | - Ziyan Shao
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
| | - Jiancheng Wang
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
| | - Zhongxian Liu
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
| | - Ya-Min Li
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
| | - Yuehai Shen
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
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8
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Ni S, Garrido-Castro AF, Merchant RR, de Gruyter JN, Schmitt DC, Mousseau JJ, Gallego GM, Yang S, Collins MR, Qiao JX, Yeung KS, Langley DR, Poss MA, Scola PM, Qin T, Baran PS. A General Amino Acid Synthesis Enabled by Innate Radical Cross-Coupling. Angew Chem Int Ed Engl 2018; 57:14560-14565. [PMID: 30212610 PMCID: PMC6352899 DOI: 10.1002/anie.201809310] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Indexed: 01/21/2023]
Abstract
The direct union of primary, secondary, and tertiary carboxylic acids with a chiral glyoxylate-derived sulfinimine provides rapid access into a variety of enantiomerically pure α-amino acids (>85 examples). Characterized by operational simplicity, this radical-based reaction enables the modular assembly of exotic α-amino acids, including both unprecedented structures and those of established industrial value. The described method performs well in high-throughput library synthesis, and has already been implemented in three distinct medicinal chemistry campaigns.
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Affiliation(s)
- Shengyang Ni
- Scripps Research, North Torrey Pines Road, La Jolla, CA, 92037, USA
| | | | - Rohan R Merchant
- Scripps Research, North Torrey Pines Road, La Jolla, CA, 92037, USA
| | | | - Daniel C Schmitt
- Pfizer Medicinal Sciences, Eastern Point Road, Groton, CT, 06340, USA
| | - James J Mousseau
- Pfizer Medicinal Sciences, Eastern Point Road, Groton, CT, 06340, USA
| | - Gary M Gallego
- Department of Chemistry, La Jolla Laboratories, Pfizer, 10770 Science Center Drive, San Diego, CA, 92121, USA
| | - Shouliang Yang
- Department of Chemistry, La Jolla Laboratories, Pfizer, 10770 Science Center Drive, San Diego, CA, 92121, USA
| | - Michael R Collins
- Department of Chemistry, La Jolla Laboratories, Pfizer, 10770 Science Center Drive, San Diego, CA, 92121, USA
| | - Jennifer X Qiao
- Department of Discovery Chemistry, Bristol-Myers Squibb Company, Research and Development, P.O. Box 4000, Princeton, NJ, 08543, USA
| | - Kap-Sun Yeung
- Department of Discovery Chemistry, Bristol-Myers Squibb Research and Development, 5 Research Parkway, Wallingford, CT, 06492, USA
| | - David R Langley
- Department of Discovery Chemistry, Bristol-Myers Squibb Research and Development, 5 Research Parkway, Wallingford, CT, 06492, USA
| | - Michael A Poss
- Department of Discovery Chemistry, Bristol-Myers Squibb Company, Research and Development, P.O. Box 4000, Princeton, NJ, 08543, USA
| | - Paul M Scola
- Department of Discovery Chemistry, Bristol-Myers Squibb Research and Development, 5 Research Parkway, Wallingford, CT, 06492, USA
| | - Tian Qin
- Scripps Research, North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Phil S Baran
- Scripps Research, North Torrey Pines Road, La Jolla, CA, 92037, USA
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9
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Gokada MR, Hunter R, Andrijevic A, Petersen WF, Samanta S, Venter G, Rees-Jones S. Quaternized α,α'-Amino Acids via Curtius Rearrangement of Substituted Malonate-Imidazolidinones. J Org Chem 2017; 82:10650-10658. [PMID: 28903002 DOI: 10.1021/acs.joc.7b01684] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
An efficient synthesis protocol is presented for accessing quaternized α-amino acids in chiral, nonracemic form via diastereoselective malonate alkylation followed by C- to N-transposition. The key stereodifferentiating step involves a diastereoselective alkylation of an α-monosubstituted malonate-imidazolidinone, which is followed first by a chemoselective malonate PMB ester removal and then a Curtius rearrangement to provide the transposition. The method demonstrates a high product ee (89-99% for eight cases) for quaternizing a range of proteinogenic α-amino acids. The stereogenicity in targets 5a-i supports previous conclusions that the diastereoselective alkylation step proceeds via an α-substituted malonate-imidazolidinone enolate in its Z-configuration, with the auxiliary in an s-transC-N conformation.
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Affiliation(s)
- Maheswara Rao Gokada
- Department of Chemistry, University of Cape Town , Rondebosch 7701, South Africa
| | - Roger Hunter
- Department of Chemistry, University of Cape Town , Rondebosch 7701, South Africa
| | - Ana Andrijevic
- Department of Chemistry, University of Cape Town , Rondebosch 7701, South Africa
| | - Wade F Petersen
- Department of Chemistry, University of Cape Town , Rondebosch 7701, South Africa
| | - Sauvik Samanta
- Department of Chemistry, University of Cape Town , Rondebosch 7701, South Africa
| | - Gerhard Venter
- Department of Chemistry, University of Cape Town , Rondebosch 7701, South Africa
| | - Sophie Rees-Jones
- Department of Chemistry, University of Cape Town , Rondebosch 7701, South Africa
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10
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García-Muñoz MJ, Foubelo F, Yus M. Stereoselective Synthesis of 2-(2-Aminoalkyl)- and 1,3-Disubstituted Tetrahydro-1H-pyrido[4,3-b]- Benzofuran and Indole Derivatives. J Org Chem 2016; 81:10214-10226. [PMID: 27332863 DOI: 10.1021/acs.joc.6b01047] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The addition of an allenyl indium intermediate to chiral N-tert-butanesulfinyl imines 7 proceeds with high levels of diastereocontrol. The resulting homopropargylic amine derivatives 10 were transformed into 2-(2-aminoalkyl)benzofuran and indole derivatives 13 and 19, after Sonogashira coupling with o-iodophenol or o-iodoaniline, followed by formation of the heteroaromatic ring through an intramolecular cyclization. Enantioenriched tetrahydropyrido-benzofuran and indole derivatives 16 and 21 were prepared through a Pictet-Spengler condensation of the free amines derived from compounds 15 and 20, involving the nucleophilic 3-position of the benzofuran or indole moiety.
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Affiliation(s)
- María Jesús García-Muñoz
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante , Apdo. 99, 03080 Alicante, Spain.,Instituto de Síntesis Orgánica (ISO), Universidad de Alicante , Apdo. 99, 03080 Alicante, Spain.,Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Alicante , Apdo. 99, 03080 Alicante, Spain
| | - Francisco Foubelo
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante , Apdo. 99, 03080 Alicante, Spain.,Instituto de Síntesis Orgánica (ISO), Universidad de Alicante , Apdo. 99, 03080 Alicante, Spain.,Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Alicante , Apdo. 99, 03080 Alicante, Spain
| | - Miguel Yus
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante , Apdo. 99, 03080 Alicante, Spain.,Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Alicante , Apdo. 99, 03080 Alicante, Spain
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11
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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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