1
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Mandal PK, Katukojvala S. Rh-Catalyzed Chemodivergent [3+3] Annulations of Diazoenals and α-Aminoketones: Direct Synthesis of Functionalized 1,2-Dihydropyridines and Fused 1,4-Oxazines. Chemistry 2024; 30:e202303862. [PMID: 38165004 DOI: 10.1002/chem.202303862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 12/25/2023] [Accepted: 01/02/2024] [Indexed: 01/03/2024]
Abstract
Novel rhodium-catalyzed [3+3] annulations of diazoenals and α-amino ketones has been disclosed here. The reactivity of diazoenals has been switched from carbenoid to vinylogous NH-insertion by altering acyclic to cyclic α-amino ketones. In this direction, we report an efficient strategy to synthesize 1,2-dihydropyridines (DHPs) and fused 1,4-oxazines. Mechanistic investigation revealed that the formyl group is necessary for carbenoid [3+3] annulation and the cyclohexyl group is the dictating factor for vinylogous NH- insertion. The synthetic utility of 1,2-dihydropyridines was demonstrated by synthesizing piperidine, pyrido[1,2-a]indole, and 2-pyridone scaffolds. Further, structural diversification of fused 1,4-oxazines resulted in the short synthesis of hexahydroquinolin-2(1H)-ones, hexahydro quinolines and tetrahydroquinolinones via ring opening rearrangement and a new oxidative deformylation, respectively.
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Affiliation(s)
- Pratap Kumar Mandal
- Department of Chemistry, Indian Institute of Science Education & Research, Bhopal, Madhya Pradesh, 462066
| | - Sreenivas Katukojvala
- Department of Chemistry, Indian Institute of Science Education & Research, Bhopal, Madhya Pradesh, 462066
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2
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Boddy A, Sahay AK, Rivers EL, White AJP, Spivey AC, Bull JA. Enantioselective Phase-Transfer-Catalyzed Synthesis of Spirocyclic Azetidine Oxindoles. Org Lett 2024; 26:2079-2084. [PMID: 38447584 PMCID: PMC10949229 DOI: 10.1021/acs.orglett.4c00358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 02/28/2024] [Accepted: 03/04/2024] [Indexed: 03/08/2024]
Abstract
Spiro-3,2'-azetidine oxindoles combine two independently important pharmacophores in an understudied spirocyclic motif that is attractive for medicinal chemistry. Here, the enantioselective synthesis of these structures is achieved in up to 2:98 er through intramolecular C-C bond formation, involving activation of the substrate with a novel SF5-containing chiral cation phase-transfer (PT) catalyst. The products are readily elaborated/deprotected to afford medicinally relevant enantioenriched compounds. Control experiments suggest an interfacial PT mechanism, whereby catalytic asymmetric induction is achieved through the activation of the chloride leaving group.
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Affiliation(s)
- Alexander
J. Boddy
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
| | - Aditya K. Sahay
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
| | - Emma L. Rivers
- Hit
Discovery, Discovery Sciences, R&D, AstraZeneca, Cambridge, U.K.
| | - Andrew J. P. White
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
| | - Alan C. Spivey
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
| | - James A. Bull
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
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3
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Stebletsova IA, Larin AA, Ananyev IV, Fershtat LL. Regioselective Synthesis of NO-Donor (4-Nitro-1,2,3-triazolyl)furoxans via Eliminative Azide-Olefin Cycloaddition. Molecules 2023; 28:6969. [PMID: 37836813 PMCID: PMC10574565 DOI: 10.3390/molecules28196969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 09/29/2023] [Accepted: 10/01/2023] [Indexed: 10/15/2023] Open
Abstract
A facile and efficient method for the regioselective [3 + 2] cycloaddition of 4-azidofuroxans to 1-dimethylamino-2-nitroethylene under p-TSA catalysis affording (4-nitro-1,2,3-triazolyl)furoxans was developed. This transformation is believed to proceed via eliminative azide-olefin cycloaddition resulting in its complete regioselectivity. The developed protocol has a broad substrate scope and enables a straightforward assembly of the 4-nitro-1,2,3-triazole motif. Moreover, synthesized (4-nitro-1,2,3-triazolyl)furoxans were found to be capable of NO release in a broad range of concentrations, thus providing a novel platform for future drug design and related biomedical applications of heterocyclic NO donors.
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Affiliation(s)
- Irina A. Stebletsova
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, 119991 Moscow, Russia; (I.A.S.); (A.A.L.)
- D.I. Mendeleev University of Chemical Technology of Russia, 9 Miusskaya Square, 125047 Moscow, Russia
| | - Alexander A. Larin
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, 119991 Moscow, Russia; (I.A.S.); (A.A.L.)
| | - Ivan V. Ananyev
- N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, GSP-1, Leninsky Prospect, 31, 119991 Moscow, Russia;
| | - Leonid L. Fershtat
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, 119991 Moscow, Russia; (I.A.S.); (A.A.L.)
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4
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Nutt MJ, Annear JW, Jones KD, Flematti GR, Moggach SA, Stewart SG. Dirhodium-Catalyzed Transannulation of N-Sulfonyl-1,2,3-triazoles to 2,3-Dehydropiperazines. J Org Chem 2023; 88:11968-11979. [PMID: 37523269 DOI: 10.1021/acs.joc.3c01259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
The dirhodium(II)-catalyzed synthesis of a range of C2-substituted 2,3-dehydropiperazines using 1-mesyl-1,2,3-triazoles and β-haloalkylcarbamates is reported. The reaction is proposed to proceed through an α-imino rhodium carbene 1,3-insertion into N-H followed by a base-mediated cyclization. C-Substituted dehydropiperazines can also be conducted directly from terminal alkynes in a three-step, one-pot operation, forming the triazole in situ. This methodology has also been expanded to afford several 2,5-disubstituted 2,3-dehydropiperazines as well as a larger 4,5,6,7-tetrahydro-1H-1,4-diazepine derivative.
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Affiliation(s)
- Michael J Nutt
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Jack W Annear
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Kieran D Jones
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Gavin R Flematti
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Stephen A Moggach
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Scott G Stewart
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
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5
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Kim JK, Liu Y, Gong M, Li Y, Huang M, Wu Y. A facile visible-light-induced one-pot synthesis of 3-alkyl coumarins from simple salicylaldehydes. Tetrahedron 2023. [DOI: 10.1016/j.tet.2023.133249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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6
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Lathrop SP, Mlinar LB, Manjrekar ON, Zhou Y, Harper KC, Sacia ER, Higgins M, Bogdan AR, Wang Z, Richter SM, Gong W, Voight EA, Henle J, Diwan M, Kallemeyn JM, Sharland JC, Wei B, Davies HML. Continuous Process to Safely Manufacture an Aryldiazoacetate and Its Direct Use in a Dirhodium-Catalyzed Enantioselective Cyclopropanation. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.2c00288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Stephen P. Lathrop
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Laurie B. Mlinar
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Onkar N. Manjrekar
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Yong Zhou
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Kaid C. Harper
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Eric R. Sacia
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Molly Higgins
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Andrew R. Bogdan
- Advanced Chemistry Technologies, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Zhe Wang
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Steven M. Richter
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Wei Gong
- Drug Discovery Science & Technology, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Eric A. Voight
- Drug Discovery Science & Technology, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Jeremy Henle
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Moiz Diwan
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Jeffrey M. Kallemeyn
- Process Research and Development, AbbVie Inc., North Chicago, Illinois 60064, United States
| | - Jack C. Sharland
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | - Bo Wei
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | - Huw M. L. Davies
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
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7
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Iida K, Suzuki N, Sasaki A, Ishida S, Arai T. Development of a novel light-up probe for detection of G-quadruplexes in stress granules. Sci Rep 2022; 12:12892. [PMID: 35902691 PMCID: PMC9334577 DOI: 10.1038/s41598-022-17230-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 07/21/2022] [Indexed: 11/09/2022] Open
Abstract
G-quadruplexes (G4s) regulate various biological processes in cells. However, cellular imaging of dynamically forming G4s in biomolecular condensates using small molecules has been poorly investigated. Herein, we present a fluorescent light-up probe with the ability to selectively stabilize G4s and enhance fluorescence upon G4 binding. The foci of the probe were mainly observed in the nucleoli. These were co-localized with anti-fibrillarin antibodies and anti-G4 antibodies (BG4). Moreover, we tested detection of G4 in stress granules using the developed probe. Stress granules were induced through treatment with not only thapsigargin, but also known G4 ligands (pyridostatin, RHPS4, and BRACO-19). In the stress granules, co-localization between the probe, BG4, and stress granule markers (TIA1 and G3BP1) was detected. We present a practical light-up probe for G4s in stress granules, providing potential targets for G4 ligands.
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Affiliation(s)
- Keisuke Iida
- Soft Molecular Activation Research Center (SMARC), Chiba Iodine Resource Innovation Center (CIRIC), Molecular Chirality Research Center (MCRC), and Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi, Inage, Chiba , 263-8522, Japan.
| | - Natsumi Suzuki
- Soft Molecular Activation Research Center (SMARC), Chiba Iodine Resource Innovation Center (CIRIC), Molecular Chirality Research Center (MCRC), and Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi, Inage, Chiba , 263-8522, Japan
| | - Ayano Sasaki
- Soft Molecular Activation Research Center (SMARC), Chiba Iodine Resource Innovation Center (CIRIC), Molecular Chirality Research Center (MCRC), and Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi, Inage, Chiba , 263-8522, Japan
| | - Shunsuke Ishida
- Soft Molecular Activation Research Center (SMARC), Chiba Iodine Resource Innovation Center (CIRIC), Molecular Chirality Research Center (MCRC), and Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi, Inage, Chiba , 263-8522, Japan
| | - Takayoshi Arai
- Soft Molecular Activation Research Center (SMARC), Chiba Iodine Resource Innovation Center (CIRIC), Molecular Chirality Research Center (MCRC), and Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi, Inage, Chiba , 263-8522, Japan
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8
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Ou P, Zhu L, Yu Y, Ma L, Huang X. Palladium-Catalyzed Three-Component Selective Aminoallylation of Diazo Compounds. Org Lett 2022; 24:4160-4164. [PMID: 35657704 DOI: 10.1021/acs.orglett.2c01399] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We describe a Xantphos-containing dinuclear palladium complex-enabled geminal aminoallylation of diazocarbonyl compounds, which selectively provides a range of quaternary α-amino esters. Direct N-H insertion, allylic alkylation of amino nucleophiles, and diene formation were not observed under standard conditions. Mechanistic studies indicated that a relayed pathway via allylation of the N-H insertion product or [2,3]-sigmatropic rearrangement of an ylide intermediate was unlikely.
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Affiliation(s)
- Pengcheng Ou
- State Key Laboratory of Structure Chemistry, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, Fujian College, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Lei Zhu
- State Key Laboratory of Structure Chemistry, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, Fujian College, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Yinghua Yu
- State Key Laboratory of Structure Chemistry, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, Fujian College, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Liyao Ma
- State Key Laboratory of Structure Chemistry, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, Fujian College, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Xueliang Huang
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education of China, Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, China
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9
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Piticari A, Antermite D, Higham JI, Moore JH, Webster MP, Bull JA. Stereoselective Palladium‐Catalyzed C(
sp
3
)−H Mono‐Arylation of Piperidines and Tetrahydropyrans with a C(4) Directing Group. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200030] [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)
- Amalia‐Sofia Piticari
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane London W12 0BZ UK
| | - Daniele Antermite
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane London W12 0BZ UK
| | - Joe I. Higham
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane London W12 0BZ UK
| | - J. Harry Moore
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane London W12 0BZ UK
| | | | - James A. Bull
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane London W12 0BZ UK
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10
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Tayama E, Shimizu G, Nakao R. Base-induced Sommelet–Hauser rearrangement of N-(pyridinylmethyl) tetraalkylammonium salts. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Townley C, McMurray L, Marsden SP, Nelson A. A unified "top-down" approach for the synthesis of diverse lead-like molecular scaffolds. Bioorg Med Chem Lett 2022; 62:128631. [PMID: 35181466 DOI: 10.1016/j.bmcl.2022.128631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 02/14/2022] [Accepted: 02/14/2022] [Indexed: 11/16/2022]
Abstract
A "top-down" synthetic approach enabled the step-efficient synthesis of 21 diverse novel molecular scaffolds. The scaffolds were derived from four complex intermediates that had been prepared using cycloaddition chemistry. Scaffold-hopping of these intermediates was achieved through attachment of an additional ring, ring cleavage, ring expansion and/or ring fusion. It was shown that the resulting scaffolds could be decorated to yield diverse lead-like screening compounds.
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Affiliation(s)
- Chloe Townley
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK; Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, LS2 9JT, UK; Oncology R&D, AstraZeneca, Cambridge, CB4 0WG, United Kingdom
| | - Lindsay McMurray
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK; Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, LS2 9JT, UK; Oncology R&D, AstraZeneca, Cambridge, CB4 0WG, United Kingdom
| | - Stephen P Marsden
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK; Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, LS2 9JT, UK; Oncology R&D, AstraZeneca, Cambridge, CB4 0WG, United Kingdom
| | - Adam Nelson
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK; Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, LS2 9JT, UK; Oncology R&D, AstraZeneca, Cambridge, CB4 0WG, United Kingdom
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12
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López L, Cabal M, Valdés C. Construction of NH‐Unprotected Spiropyrrolidines and Spiroisoindolines by [4+1] Cyclizations of γ‐Azidoboronic Acids with Cyclic
N
‐Sulfonylhydrazones. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202113370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lucía López
- Departmento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - María‐Paz Cabal
- Departmento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Carlos Valdés
- Departmento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
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13
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Choi SM, Kim KD, Park JU, Xuan Z, Kim JH. Pd-catalyzed [3 + 2] cycloaddition of cyclic ketimines and trimethylenemethanes toward N-fused pyrrolidines bearing a quaternary carbon. RSC Adv 2021; 12:785-789. [PMID: 35425099 PMCID: PMC8978666 DOI: 10.1039/d1ra08579d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 12/17/2021] [Indexed: 12/14/2022] Open
Abstract
A Pd-catalyzed [3 + 2] cycloaddition of N-sulfonyl cyclic ketimines and trimethylenemethanes (TMM) was developed that afforded N-fused pyrrolidines bearing a quaternary carbon. Under mild reaction conditions, structurally diverse N-sulfonyl cyclic imines, including sulfamate-fused aldimines, aryl- or styryl-substituted sulfamate-derived ketimines, and N-sulfonyl cyclic ketimines, were tolerated as reactants, affording N-fused pyrrolidines with high efficiency.
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Affiliation(s)
- Seoung-Mi Choi
- Department of Chemistry (BK21 Four), Research Institute of Natural Science, Gyeongsang National University 52828 Jinju Korea
| | - Kyeong Do Kim
- Department of Chemistry (BK21 Four), Research Institute of Natural Science, Gyeongsang National University 52828 Jinju Korea
| | - Jong-Un Park
- Department of Chemistry (BK21 Four), Research Institute of Natural Science, Gyeongsang National University 52828 Jinju Korea
| | - Zi Xuan
- Department of Chemistry (BK21 Four), Research Institute of Natural Science, Gyeongsang National University 52828 Jinju Korea
| | - Ju Hyun Kim
- Department of Chemistry (BK21 Four), Research Institute of Natural Science, Gyeongsang National University 52828 Jinju Korea
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14
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López L, Cabal MP, Valdés C. Construction of NH-Unprotected Spiropyrrolidines and Spiroisoindolines by [4+1] Cyclizations of γ-Azidoboronic Acids with Cyclic N-Sulfonylhydrazones. Angew Chem Int Ed Engl 2021; 61:e202113370. [PMID: 34677906 PMCID: PMC9298762 DOI: 10.1002/anie.202113370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Indexed: 12/30/2022]
Abstract
The reactions of N‐sulfonylhydrazones derived from cyclic ketones with γ‐azidopropylboronic acid and 2‐(azidomethyl)phenylboronic acid give rise to spirocyclic pyrrolidines and spiroisoindolines, respectively. The reactions proceed without the need of any transition‐metal catalyst through a domino process that comprises the formation of a Csp3‐C and a Csp3‐N bond of the former hydrazonic carbon. The scope of the reaction has been explored by the preparation of over 50 examples of NH‐unprotected spirocyclic derivatives. Importantly, this methodology could be applied for the preparation of alkaloid steroids from steroid N‐tosylhydrazones.
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Affiliation(s)
- Lucía López
- Departmento de Química Orgánica e Inorgánica, Instituto de Química Organometálica "Enrique Moles", Universidad de Oviedo, C/ Julián Clavería 8, 33006, Oviedo, Spain
| | - María-Paz Cabal
- Departmento de Química Orgánica e Inorgánica, Instituto de Química Organometálica "Enrique Moles", Universidad de Oviedo, C/ Julián Clavería 8, 33006, Oviedo, Spain
| | - Carlos Valdés
- Departmento de Química Orgánica e Inorgánica, Instituto de Química Organometálica "Enrique Moles", Universidad de Oviedo, C/ Julián Clavería 8, 33006, Oviedo, Spain
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15
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Kondoh A, Ojima R, Terada M. Formal Fluorinative Ring Opening of 2-Benzoylpyrrolidines Utilizing [1,2]-Phospha-Brook Rearrangement for Synthesis of 2-Aryl-3-fluoropiperidines. Org Lett 2021; 23:7894-7899. [PMID: 34585940 DOI: 10.1021/acs.orglett.1c02907] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A ring expansion of 2-benzoylpyrrolidines, which involves the formal fluorinative ring opening utilizing the [1,2]-phospha-Brook rearrangement under Brønsted base catalysis and a subsequent intramolecular reductive amination, was developed. The operationally simple three-step protocol provides an efficient access to 2-aryl-3-fluoropiperidines. The methodology was further applied to the syntheses of azepanes and tetrahydroquinolines.
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Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Rihaku Ojima
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Masahiro Terada
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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16
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Malarney KP, Kc S, Schmidt VA. Recent strategies used in the synthesis of saturated four-membered heterocycles. Org Biomol Chem 2021; 19:8425-8441. [PMID: 34546272 DOI: 10.1039/d1ob00988e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The importance and prevalance of O-, N-, and S-atom containing saturated four-membered ring motifs in biologically active molecules and potential therapeutics continues to drive efforts in their efficient synthetic preparation. In this review, general and recent strategies for the synthesis of these heterocycles are presented. Due to the limited potential bond disconnections, retrosynthetic strategies are broadly limited to cyclizations and cycloadditions. Nonetheless, diverse approaches for accessing cyclization precursors have been developed, ranging from nucleophilic substitution to C-H functionalization. Innovative methods for substrate activation have been developed for cycloadditions under photochemical and thermal conditions. Advances in accessing oxetanes, azetidines, and thietanes remain active areas of research with continued breakthroughs anticipated to enable future applications.
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Affiliation(s)
- Kien P Malarney
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92071, USA.
| | - Shekhar Kc
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92071, USA.
| | - Valerie A Schmidt
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92071, USA.
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17
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Bhat A, Tucker N, Lin JB, Grover H. Stereoselective copper-catalyzed heteroarene C-H functionalization/Michael-type annulation cascade with α-diazocarbonyls. Chem Commun (Camb) 2021; 57:10556-10559. [PMID: 34557880 DOI: 10.1039/d1cc04590c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A stereoselective, copper-catalyzed, arene C(sp2)-H functionalization/Michael-type annulation reaction involving α-diazocarbonyl compounds has been developed. The method features low catalyst loadings, high yields, and excellent regio and stereoselectivity, in the synthesis of various heteroaromatic frameworks by employing indoles as the arene partner.
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Affiliation(s)
- Aabid Bhat
- Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X7, Canada.
| | - Nathan Tucker
- Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X7, Canada.
| | - Jian-Bin Lin
- C-CART, CREAIT Network, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X7, Canada
| | - Huck Grover
- Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X7, Canada.
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18
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Russo TVC, Sá MM. One‐Pot Synthesis of α‐Diazo‐γ,δ‐unsaturated Esters as Versatile Building Blocks for Functionalized Dienes, Cyclopentenes, and 5,7‐Fused Bicycles. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Theo V. C. Russo
- Departamento de Química Universidade Federal de Santa Catarina Florianópolis SC 88040-900 Brazil
| | - Marcus M. Sá
- Departamento de Química Universidade Federal de Santa Catarina Florianópolis SC 88040-900 Brazil
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19
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Mughal H, Szostak M. Recent advances in the synthesis and reactivity of azetidines: strain-driven character of the four-membered heterocycle. Org Biomol Chem 2021; 19:3274-3286. [PMID: 33899862 DOI: 10.1039/d1ob00061f] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Azetidines represent one of the most important four-membered heterocycles used in organic synthesis and medicinal chemistry. The reactivity of azetidines is driven by a considerable ring strain, while at the same the ring is significantly more stable than that of related aziridines, which translates into both facile handling and unique reactivity that can be triggered under appropriate reaction conditions. Recently, remarkable advances in the chemistry and reactivity of azetidines have been reported. In this review, we provide an overview of the synthesis, reactivity and application of azetidines that have been published in the last years with a focus on the most recent advances, trends and future directions. The review is organized by the methods of synthesis of azetidines and the reaction type used for functionalization of azetidines. Finally, recent examples of using azetidines as motifs in drug discovery, polymerization and chiral templates are discussed.
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Affiliation(s)
- Haseeb Mughal
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA.
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA.
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20
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Sajjad F, Chen Y, Tian X, Dong S, Gopi Krishna Reddy A, Hu W, Xing D. Facile synthesis of 1,4-oxazines by ruthenium-catalyzed tandem N-H insertion/cyclization of α-arylamino ketones and diazo pyruvates. Org Biomol Chem 2021; 19:1769-1772. [PMID: 33538720 DOI: 10.1039/d0ob01913e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Herein, we report an efficient strategy for the rapid construction of 1,4-oxazines starting from simple α-amino ketones and diazo pyruvates under mild reaction conditions. This transformation is efficiently catalyzed by RuCl3 through a tandem N-H insertion/cyclization sequence via an enol formation. This reaction shows broad functional group tolerance, and the resulting 1,4-oxazine products show promising anticancer activities toward HCT116.
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Affiliation(s)
- Farrukh Sajjad
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Rd., Shanghai, 200062, China.
| | - Yanmei Chen
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Rd., Shanghai, 200062, China.
| | - Xue Tian
- A School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China.
| | - Suzhen Dong
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Rd., Shanghai, 200062, China.
| | | | - Wenhao Hu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Rd., Shanghai, 200062, China. and A School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China.
| | - Dong Xing
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Rd., Shanghai, 200062, China.
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21
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Bystrov DM, Ananyev IV, Fershtat LL, Makhova NN. Direct Synthesis of N-(1,2,5-Oxadiazolyl)hydrazones through a Diazotization/Reduction/Condensation Cascade. J Org Chem 2020; 85:15466-15475. [PMID: 33185453 DOI: 10.1021/acs.joc.0c02243] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A straightforward synthesis of a series of previously unknown N-(1,2,5-oxadiazolyl)hydrazones through the diazotization/reduction/condensation cascade of amino-1,2,5-oxadiazoles was accomplished. The described protocol was suitable for a wide array of target hydrazones, which were prepared in good to high yields under smooth reaction conditions with very good functional group tolerance. Importantly, the presented approach unveils a direct route to in situ generation of previously inaccessible (1,2,5-oxadiazolyl)hydrazines. In addition, a first example of the ionic structure incorporating a protonated hydrazone motif linked to the 1,2,5-oxadiazole 2-oxide subunit was synthesized, indicating the stability of prepared compounds toward acid-promoted hydrolysis. Overall, this method provides a direct access to the isosteric analogues of drug candidates for treatment of various neglected diseases, thus enabling their potential application in medicinal chemistry and drug design.
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Affiliation(s)
- Dmitry M Bystrov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prosp., 47, Moscow 119991, Russia
| | - Ivan V Ananyev
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, Moscow 119991, Russia.,Plekhanov Russian University of Economics, Stremyanny Per. 36, Moscow 117997, Russia
| | - Leonid L Fershtat
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prosp., 47, Moscow 119991, Russia
| | - Nina N Makhova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prosp., 47, Moscow 119991, Russia
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22
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Florentino L, López L, Barroso R, Cabal M, Valdés C. Synthesis of Pyrrolidines by a Csp
3
‐Csp
3
/Csp
3
‐
N
Transition‐Metal‐Free Domino Reaction of Boronic Acids with γ‐Azido‐
N
‐Tosylhydrazones. Angew Chem Int Ed Engl 2020; 60:1273-1280. [DOI: 10.1002/anie.202010528] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/29/2020] [Indexed: 12/20/2022]
Affiliation(s)
- Lucía Florentino
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Lucía López
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Raquel Barroso
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - María‐Paz Cabal
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Carlos Valdés
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
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23
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Florentino L, López L, Barroso R, Cabal M, Valdés C. Synthesis of Pyrrolidines by a Csp
3
‐Csp
3
/Csp
3
‐
N
Transition‐Metal‐Free Domino Reaction of Boronic Acids with γ‐Azido‐
N
‐Tosylhydrazones. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010528] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Lucía Florentino
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Lucía López
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Raquel Barroso
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - María‐Paz Cabal
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
| | - Carlos Valdés
- Departamento de Química Orgánica e Inorgánica Instituto de Química Organometálica “Enrique Moles” Universidad de Oviedo C/ Julián Clavería 8 33006 Oviedo Spain
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24
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Tran HV, Vu HD, Graton J, Jacquemin D, Renault J, Uriac P. Synthesis of heterocyclic enamine-zinc complexes as precursors of stereocontrolled substitution of nitrogen α-position. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152405] [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]
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25
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Downes TD, Jones SP, Klein HF, Wheldon MC, Atobe M, Bond PS, Firth JD, Chan NS, Waddelove L, Hubbard RE, Blakemore DC, De Fusco C, Roughley SD, Vidler LR, Whatton MA, Woolford AJ, Wrigley GL, O'Brien P. Design and Synthesis of 56 Shape-Diverse 3D Fragments. Chemistry 2020; 26:8969-8975. [PMID: 32315100 PMCID: PMC7496344 DOI: 10.1002/chem.202001123] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 04/16/2020] [Indexed: 12/13/2022]
Abstract
Fragment-based drug discovery is now widely adopted for lead generation in the pharmaceutical industry. However, fragment screening collections are often predominantly populated with flat, 2D molecules. Herein, we describe a workflow for the design and synthesis of 56 3D disubstituted pyrrolidine and piperidine fragments that occupy under-represented areas of fragment space (as demonstrated by a principal moments of inertia (PMI) analysis). A key, and unique, underpinning design feature of this fragment collection is that assessment of fragment shape and conformational diversity (by considering conformations up to 1.5 kcal mol-1 above the energy of the global minimum energy conformer) is carried out prior to synthesis and is also used to select targets for synthesis. The 3D fragments were designed to contain suitable synthetic handles for future fragment elaboration. Finally, by comparing our 3D fragments with six commercial libraries, it is clear that our collection has high three-dimensionality and shape diversity.
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Affiliation(s)
- Thomas D. Downes
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - S. Paul Jones
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - Hanna F. Klein
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - Mary C. Wheldon
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - Masakazu Atobe
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
- Asahi Kasei Pharma Corporation632-1 Mifuku, IzunokuniShizuoka410-2321Japan
| | - Paul S. Bond
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - James D. Firth
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - Ngai S. Chan
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - Laura Waddelove
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
| | - Roderick E. Hubbard
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
- Vernalis (R&D) LtdGranta Park, AbingtonCambridgeCB21 6GBUK
| | | | | | | | - Lewis R. Vidler
- Eli Lilly and Company LimitedErl Wood Manor, Sunninghill RoadWindleshamSurreyGU20 6PHUK
| | - Maria Ann Whatton
- Eli Lilly and Company LimitedErl Wood Manor, Sunninghill RoadWindleshamSurreyGU20 6PHUK
| | | | - Gail L. Wrigley
- Medicinal Chemistry, Oncology R&DAstraZenecaCB4 0WGCambridgeUK
| | - Peter O'Brien
- Department of ChemistryUniversity of YorkHeslingtonYorkYO10 5DDUK
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26
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Zhang D, Wang X, Zhang M, Hu W. Rhodium-Catalyzed Sequential Cycloisomerization/Aldol Addition of Cyclopropene Carboxylic Acids with Isatins. Org Lett 2020; 22:5600-5604. [PMID: 32628497 DOI: 10.1021/acs.orglett.0c01957] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A unique, rhodium-catalyzed reaction of cyclopropene carboxylic acids with isatins has been developed, which takes place through a trapping process of transient cyclic carboxylic oxonium ylides. This reaction tolerates a wide variety of cyclopropene carboxylic acids and N-protected or unprotected isatins and represents a new, direct strategy to access valuable γ-substituted γ-butenolide architectures containing an oxindole moiety in very high yields under mild reaction conditions.
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Affiliation(s)
- Dan Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Xin Wang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Mengchu Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Wenhao Hu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
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27
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Fang Z, Yin H, Lin L, Wen S, Xie L, Huang Y, Weng Z. Collaborative Activation of Trifluoroacetyl Diazoester by a Lewis Acid and Base for the Synthesis of Polysubstituted 4-Trifluoromethylpyrazoles. J Org Chem 2020; 85:8714-8722. [DOI: 10.1021/acs.joc.0c00737] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Zheng Fang
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China
| | - Hongshan Yin
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China
| | - Lu Lin
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China
| | - Shunli Wen
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China
| | - Lili Xie
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China
| | - Yangjie Huang
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China
| | - Zhiqiang Weng
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China
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28
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Catalyst‐ and Base‐Free Asymmetric Synthesis of Functionalized Prolines via One‐Pot Cascade Reactions. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000453] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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29
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Ansari MA, Yadav D, Singh MS. Rhodium(II)-Catalyzed Annulative Coupling of β-Ketothioamides with α-Diazo Compounds: Access to Highly Functionalized Thiazolidin-4-ones and Thiazolines. J Org Chem 2020; 85:8320-8329. [DOI: 10.1021/acs.joc.0c00378] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Monish Arbaz Ansari
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Dhananjay Yadav
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Maya Shankar Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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30
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Itoh K, Takashino A, Ohtsuka A, Kobe M, Sawamura S, Kato R, Hirayama S, Karaki F, Mizuguchi T, Sato N, Tokunaga K, Toda Y, Suga H, Ishida H, Fujii H. Synthesis of 1,2,5‐Oxadiazinane Derivatives by Photochemical Cycloaddition of Nitrones with Diaminomethanes. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.202000004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kennosuke Itoh
- Laboratory of Medicinal Chemistry, School of PharmacyKitasato University Tokyo 108-8641 Japan
- Medicinal Research Laboratories, School of PharmacyKitasato University Tokyo 108-8641 Japan
| | - Atsushi Takashino
- Laboratory of Medicinal Chemistry, School of PharmacyKitasato University Tokyo 108-8641 Japan
| | - Atsushi Ohtsuka
- Department of Chemistry, Graduate School of ScienceKitasato University Kanagawa 252-0373 Japan
| | - Mizuki Kobe
- Department of Chemistry, Graduate School of ScienceKitasato University Kanagawa 252-0373 Japan
| | - Shunsuke Sawamura
- Laboratory of Medicinal Chemistry, School of PharmacyKitasato University Tokyo 108-8641 Japan
| | - Ryo Kato
- Department of Materials Chemistry, Faculty of EngineeringShinshu University Nagano 380-8553 Japan
| | - Shigeto Hirayama
- Laboratory of Medicinal Chemistry, School of PharmacyKitasato University Tokyo 108-8641 Japan
- Medicinal Research Laboratories, School of PharmacyKitasato University Tokyo 108-8641 Japan
| | - Fumika Karaki
- Laboratory of Medicinal Chemistry, School of PharmacyKitasato University Tokyo 108-8641 Japan
- Medicinal Research Laboratories, School of PharmacyKitasato University Tokyo 108-8641 Japan
| | - Takaaki Mizuguchi
- Laboratory of Medicinal Chemistry, School of PharmacyKitasato University Tokyo 108-8641 Japan
- Medicinal Research Laboratories, School of PharmacyKitasato University Tokyo 108-8641 Japan
| | - Noriko Sato
- Medicinal Research Laboratories, School of PharmacyKitasato University Tokyo 108-8641 Japan
| | - Ken Tokunaga
- Division of Liberal Arts Center for Promotion of Higher EducationKogakuin University Tokyo 192-0015 Japan
| | - Yasunori Toda
- Department of Materials Chemistry, Faculty of EngineeringShinshu University Nagano 380-8553 Japan
| | - Hiroyuki Suga
- Department of Materials Chemistry, Faculty of EngineeringShinshu University Nagano 380-8553 Japan
| | - Hitoshi Ishida
- Department of Chemistry, Graduate School of ScienceKitasato University Kanagawa 252-0373 Japan
| | - Hideaki Fujii
- Laboratory of Medicinal Chemistry, School of PharmacyKitasato University Tokyo 108-8641 Japan
- Medicinal Research Laboratories, School of PharmacyKitasato University Tokyo 108-8641 Japan
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31
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Mavridis G, Arya R, Domnick A, Zoidakis J, Makridakis M, Vlahou A, Mpakali A, Lelis A, Georgiadis D, Tampé R, Papakyriakou A, Stern LJ, Stratikos E. A systematic re-examination of processing of MHCI-bound antigenic peptide precursors by endoplasmic reticulum aminopeptidase 1. J Biol Chem 2020; 295:7193-7210. [PMID: 32184355 PMCID: PMC7247305 DOI: 10.1074/jbc.ra120.012976] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 03/09/2020] [Indexed: 11/06/2022] Open
Abstract
Endoplasmic reticulum aminopeptidase 1 (ERAP1) trims antigenic peptide precursors to generate mature antigenic peptides for presentation by major histocompatibility complex class I (MHCI) molecules and regulates adaptive immune responses. ERAP1 has been proposed to trim peptide precursors both in solution and in preformed MHCI-peptide complexes, but which mode is more relevant to its biological function remains controversial. Here, we compared ERAP1-mediated trimming of antigenic peptide precursors in solution or when bound to three MHCI alleles, HLA-B*58, HLA-B*08, and HLA-A*02. For all MHCI-peptide combinations, peptide binding onto MHCI protected against ERAP1-mediated trimming. In only a single MHCI-peptide combination, trimming of an HLA-B*08-bound 12-mer progressed at a considerable rate, albeit still slower than in solution. Results from thermodynamic, kinetic, and computational analyses suggested that this 12-mer is highly labile and that apparent on-MHC trimming rates are always slower than that of MHCI-peptide dissociation. Both ERAP2 and leucine aminopeptidase, an enzyme unrelated to antigen processing, could trim this labile peptide from preformed MHCI complexes as efficiently as ERAP1. A pseudopeptide analogue with high affinity for both HLA-B*08 and the ERAP1 active site could not promote the formation of a ternary ERAP1/MHCI/peptide complex. Similarly, no interactions between ERAP1 and purified peptide-loading complex were detected in the absence or presence of a pseudopeptide trap. We conclude that MHCI binding protects peptides from ERAP1 degradation and that trimming in solution along with the dynamic nature of peptide binding to MHCI are sufficient to explain ERAP1 processing of antigenic peptide precursors.
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Affiliation(s)
- George Mavridis
- National Centre for Scientific Research Demokritos, Agia Paraskevi 15341, Greece
| | - Richa Arya
- University of Massachusetts Medical School, Worcester, Massachusetts 01655
| | - Alexander Domnick
- Institute of Biochemistry, Biocenter, Goethe University Frankfurt, Max-von-Laue-Strasse 9, D-60438 Frankfurt/Main, Germany
| | - Jerome Zoidakis
- Centre of Basic Research, Biomedical Research Foundation of the Academy of Athens, Athens 11527, Greece
| | - Manousos Makridakis
- Centre of Basic Research, Biomedical Research Foundation of the Academy of Athens, Athens 11527, Greece
| | - Antonia Vlahou
- Centre of Basic Research, Biomedical Research Foundation of the Academy of Athens, Athens 11527, Greece
| | - Anastasia Mpakali
- National Centre for Scientific Research Demokritos, Agia Paraskevi 15341, Greece
| | - Angelos Lelis
- Laboratory of Organic Chemistry, Chemistry Department, University of Athens, Athens 15772, Greece
| | - Dimitris Georgiadis
- Laboratory of Organic Chemistry, Chemistry Department, University of Athens, Athens 15772, Greece
| | - Robert Tampé
- Institute of Biochemistry, Biocenter, Goethe University Frankfurt, Max-von-Laue-Strasse 9, D-60438 Frankfurt/Main, Germany
| | | | - Lawrence J Stern
- University of Massachusetts Medical School, Worcester, Massachusetts 01655
| | - Efstratios Stratikos
- National Centre for Scientific Research Demokritos, Agia Paraskevi 15341, Greece.
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32
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Bhaskaran RP, Janardhanan JC, Babu BP. Metal‐Free Synthesis of Pyrazoles and Chromenopyrazoles from Hydrazones and Acetylenic Esters. ChemistrySelect 2020. [DOI: 10.1002/slct.202000719] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Rasmi P. Bhaskaran
- Department of ChemistryNational Institute of Technology Karnataka (NITK), Surathkal 575025 Mangalore
| | - Jith C. Janardhanan
- Department of Applied ChemistryCochin University of Science and Technology (CUSAT) Kochi 682022 INDIA
| | - Beneesh P. Babu
- Department of ChemistryNational Institute of Technology Karnataka (NITK), Surathkal 575025 Mangalore
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33
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Jones KD, Nutt MJ, Comninos E, Sobolev AN, Moggach SA, Miura T, Murakami M, Stewart SG. A One-Pot Reaction of α-Imino Rhodium Carbenoids and Halohydrins: Access to 2,6-Substituted Dihydro-2H-1,4-oxazines. Org Lett 2020; 22:3490-3494. [DOI: 10.1021/acs.orglett.0c00947] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Kieran D. Jones
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Michael J. Nutt
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Elena Comninos
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Alexandre N. Sobolev
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
- Centre for Microscopy, Characterization and Analysis, The University of Western Australia, Perth, WA 6009, Australia
| | - Stephen A. Moggach
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
- Centre for Microscopy, Characterization and Analysis, The University of Western Australia, Perth, WA 6009, Australia
| | - Tomoya Miura
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto, 615-8510, Japan
| | - Masahiro Murakami
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto, 615-8510, Japan
| | - Scott G. Stewart
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, WA 6009, Australia
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34
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Periasamy M, Venkanna B, Mohan L. Methods for Synthesis of Chiral Alcohols and Their Conversion to Heterocycles Containing Bi‐2‐Naphthyl Moiety. ChemistrySelect 2020. [DOI: 10.1002/slct.201903644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mariappan Periasamy
- School of chemistryUniversity of Hyderabad, Central University P.O. Hyderabad- 500046 India
| | - Boda Venkanna
- School of chemistryUniversity of Hyderabad, Central University P.O. Hyderabad- 500046 India
| | - Lakavathu Mohan
- School of chemistryUniversity of Hyderabad, Central University P.O. Hyderabad- 500046 India
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35
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Green S, Wheelhouse KM, Payne AD, Hallett JP, Miller PW, Bull JA. Thermal Stability and Explosive Hazard Assessment of Diazo Compounds and Diazo Transfer Reagents. Org Process Res Dev 2020; 24:67-84. [PMID: 31983869 PMCID: PMC6972035 DOI: 10.1021/acs.oprd.9b00422] [Citation(s) in RCA: 122] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Indexed: 11/29/2022]
Abstract
Despite their wide use in academia as metal-carbene precursors, diazo compounds are often avoided in industry owing to concerns over their instability, exothermic decomposition, and potential explosive behavior. The stability of sulfonyl azides and other diazo transfer reagents is relatively well understood, but there is little reliable data available for diazo compounds. This work first collates available sensitivity and thermal analysis data for diazo transfer reagents and diazo compounds to act as an accessible reference resource. Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and accelerating rate calorimetry (ARC) data for the model donor/acceptor diazo compound ethyl (phenyl)diazoacetate are presented. We also present a rigorous DSC dataset with 43 other diazo compounds, enabling direct comparison to other energetic materials to provide a clear reference work to the academic and industrial chemistry communities. Interestingly, there is a wide range of onset temperatures (T onset) for this series of compounds, which varied between 75 and 160 °C. The thermal stability variation depends on the electronic effect of substituents and the amount of charge delocalization. A statistical model is demonstrated to predict the thermal stability of differently substituted phenyl diazoacetates. A maximum recommended process temperature (T D24) to avoid decomposition is estimated for selected diazo compounds. The average enthalpy of decomposition (ΔH D) for diazo compounds without other energetic functional groups is -102 kJ mol-1. Several diazo transfer reagents are analyzed using the same DSC protocol and found to have higher thermal stability, which is in general agreement with the reported values. For sulfonyl azide reagents, an average ΔH D of -201 kJ mol-1 is observed. High-quality thermal data from ARC experiments shows the initiation of decomposition for ethyl (phenyl)diazoacetate to be 60 °C, compared to that of 100 °C for the common diazo transfer reagent p-acetamidobenzenesulfonyl azide (p-ABSA). The Yoshida correlation is applied to DSC data for each diazo compound to provide an indication of both their impact sensitivity (IS) and explosivity. As a neat substance, none of the diazo compounds tested are predicted to be explosive, but many (particularly donor/acceptor diazo compounds) are predicted to be impact-sensitive. It is therefore recommended that manipulation, agitation, and other processing of neat diazo compounds are conducted with due care to avoid impacts, particularly in large quantities. The full dataset is presented to inform chemists of the nature and magnitude of hazards when using diazo compounds and diazo transfer reagents. Given the demonstrated potential for rapid heat generation and gas evolution, adequate temperature control and cautious addition of reagents that begin a reaction are strongly recommended when conducting reactions with diazo compounds.
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Affiliation(s)
- Sebastian
P. Green
- Department
of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K.
- Department
of Chemical Engineering, Imperial College
London, South Kensington Campus, Exhibition Road, London SW7 2AZ, U.K.
| | - Katherine M. Wheelhouse
- API Chemistry, Product Development & Supply and Process Safety,
Pilot Plant Operations, GlaxoSmithKline,
GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K.
| | - Andrew D. Payne
- API Chemistry, Product Development & Supply and Process Safety,
Pilot Plant Operations, GlaxoSmithKline,
GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K.
| | - Jason P. Hallett
- Department
of Chemical Engineering, Imperial College
London, South Kensington Campus, Exhibition Road, London SW7 2AZ, U.K.
| | - Philip W. Miller
- Department
of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K.
| | - James A. Bull
- Department
of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K.
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36
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Bhat AH, Alavi S, Grover HK. Tandem Carbenoid C-H Functionalization/Conia-ene Cyclization of N-Propargyl Indoles Generates Pyrroloindoles under Cooperative Rh(II)/Zn(II) Catalysis. Org Lett 2020; 22:224-229. [PMID: 31854993 DOI: 10.1021/acs.orglett.9b04210] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The decomposition of diazodicarbonyl compounds in the presence of various metal catalysts has become a reliable method for the functionalization of indoles via carbenoid intermediates. Exploiting the nucleophilic reactivity of the in situ generated malonic ester product formed, we herein report a tandem C-H functionalization/Conia-ene cyclization of N-alkyne tethered indoles. This double functionalization of diazodicarbonyls generates a range of pyrrolo[1,2-a]-, pyrido[1,2-a]-, and azepino[1,2-a]indole products with good synthetic efficiency.
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Affiliation(s)
- Aabid H Bhat
- Department of Chemistry , Memorial University of Newfoundland , St. John's , Newfoundland A1B 3X7 , Canada
| | - Sima Alavi
- Department of Chemistry , Memorial University of Newfoundland , St. John's , Newfoundland A1B 3X7 , Canada
| | - Huck K Grover
- Department of Chemistry , Memorial University of Newfoundland , St. John's , Newfoundland A1B 3X7 , Canada
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37
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Andresini M, Degennaro L, Luisi R. The renaissance of strained 1-azabicyclo[1.1.0]butanes as useful reagents for the synthesis of functionalized azetidines. Org Biomol Chem 2020; 18:5798-5810. [DOI: 10.1039/d0ob01251c] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Since their discovery in the late 1960s, 1-azabicyclo[1.1.0]butanes have demonstrated to be interesting precursors of azetidines, because of the peculiar reactivity of the C3–N bond that allows double functionalization in the 1,3 positions.
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Affiliation(s)
- Michael Andresini
- Department of Pharmacy - Drug Sciences
- University of Bari “A. Moro” Via E. Orabona 4
- Bari 70125
- Italy
| | - Leonardo Degennaro
- Department of Pharmacy - Drug Sciences
- University of Bari “A. Moro” Via E. Orabona 4
- Bari 70125
- Italy
| | - Renzo Luisi
- Department of Pharmacy - Drug Sciences
- University of Bari “A. Moro” Via E. Orabona 4
- Bari 70125
- Italy
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38
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Betz KN, Chiappini ND, Du Bois J. Intermolecular sp3-C–H Amination for the Synthesis of Saturated Azacycles. Org Lett 2019; 22:1687-1691. [DOI: 10.1021/acs.orglett.9b04096] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Kerry N. Betz
- Department of Chemistry, Stanford University, 337 Campus Drive, Stanford, California 94305, United States
| | - Nicholas D. Chiappini
- Department of Chemistry, Stanford University, 337 Campus Drive, Stanford, California 94305, United States
| | - J. Du Bois
- Department of Chemistry, Stanford University, 337 Campus Drive, Stanford, California 94305, United States
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39
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Zhilin ES, Bystrov DM, Ananyev IV, Fershtat LL, Makhova NN. Straightforward Access to the Nitric Oxide Donor Azasydnone Scaffold by Cascade Reactions of Amines. Chemistry 2019; 25:14284-14289. [DOI: 10.1002/chem.201903526] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Egor S. Zhilin
- N. D. Zelinsky Institute of Organic ChemistryRussian Academy of Sciences Leninsky Prospect 47 119991 Moscow Russia
| | - Dmitry M. Bystrov
- N. D. Zelinsky Institute of Organic ChemistryRussian Academy of Sciences Leninsky Prospect 47 119991 Moscow Russia
| | - Ivan V. Ananyev
- A. N. Nesmeyanov Institute of Organoelement CompoundsRussian Academy of Sciences Vavilova str. 28 119991 Moscow Russia
| | - Leonid L. Fershtat
- N. D. Zelinsky Institute of Organic ChemistryRussian Academy of Sciences Leninsky Prospect 47 119991 Moscow Russia
| | - Nina N. Makhova
- N. D. Zelinsky Institute of Organic ChemistryRussian Academy of Sciences Leninsky Prospect 47 119991 Moscow Russia
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40
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Croft RA, Dubois MAJ, Boddy AJ, Denis C, Lazaridou A, Voisin‐Chiret AS, Bureau R, Choi C, Mousseau JJ, Bull JA. Catalytic Friedel‐Crafts Reactions on Saturated Heterocycles and Small Rings for sp
3
‐sp
2
Coupling of Medicinally Relevant Fragments. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900498] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Rosemary A. Croft
- Department of Chemistry Imperial College London Molecular Sciences Research Hub, White City Campus Wood Lane London W12 0BZ UK
| | - Maryne A. J. Dubois
- Department of Chemistry Imperial College London Molecular Sciences Research Hub, White City Campus Wood Lane London W12 0BZ UK
| | - Alexander J. Boddy
- Department of Chemistry Imperial College London Molecular Sciences Research Hub, White City Campus Wood Lane London W12 0BZ UK
| | - Camille Denis
- Department of Chemistry Imperial College London Molecular Sciences Research Hub, White City Campus Wood Lane London W12 0BZ UK
- Centre d'Etudes et de Recherche sur le Médicament de Normandie Normandie Univ, UNICAEN, CERMN 14000, Caen France
| | - Anna Lazaridou
- Department of Chemistry Imperial College London Molecular Sciences Research Hub, White City Campus Wood Lane London W12 0BZ UK
| | - Anne Sophie Voisin‐Chiret
- Centre d'Etudes et de Recherche sur le Médicament de Normandie Normandie Univ, UNICAEN, CERMN 14000, Caen France
| | - Ronan Bureau
- Centre d'Etudes et de Recherche sur le Médicament de Normandie Normandie Univ, UNICAEN, CERMN 14000, Caen France
| | - Chulho Choi
- Pfizer Global Research and Development 445 Eastern Point Rd. Groton CT 06340 USA
| | - James J. Mousseau
- Pfizer Global Research and Development 445 Eastern Point Rd. Groton CT 06340 USA
| | - James A. Bull
- Department of Chemistry Imperial College London Molecular Sciences Research Hub, White City Campus Wood Lane London W12 0BZ UK
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41
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Jia S, Dong G, Ao C, Jiang X, Hu W. Rhodium-Catalyzed Formal C-O Insertion in Carbene/Alkyne Metathesis Reactions: Synthesis of 3-Substituted 3 H-Indol-3-ols. Org Lett 2019; 21:4322-4326. [PMID: 31120759 DOI: 10.1021/acs.orglett.9b01492] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
An efficient and novel rhodium-catalyzed formal C-O insertion reaction of alkyne-tethered diazo compounds for the synthesis of 3 H-indol-3-ols is described. A type of donor/donor rhodium carbene generated in situ via a carbene/alkyne metathesis (CAM) process is the key intermediate and terminates in a unique transformation different from donor/acceptor carbenoids. In addition, 18O-labeling experiments indicate that intramolecular oxygen-atom transfer from the amide group to the carbon-carbon triple bond occurs during this transformation.
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Affiliation(s)
- Shikun Jia
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| | - Guizhi Dong
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| | - Chaoqun Ao
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| | - Xianxing Jiang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| | - Wenhao Hu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
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42
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Boddy AJ, Cordier CJ, Goldberg K, Madin A, Spivey AC, Bull JA. Acid-Mediated Ring Expansion of 2,2-Disubstituted Azetidine Carbamates to 6,6-Disubstituted 1,3-Oxazinan-2-ones. Org Lett 2019; 21:1818-1822. [PMID: 30829041 DOI: 10.1021/acs.orglett.9b00407] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The ring expansion of 2-ester-2-arylazetidine carbamates can be achieved using Brønsted acids to form 6,6-disubstituted 1,3-oxazinan-2-ones. The reaction is rapid at room temperature with Boc or Cbz derivatives and proceeds with excellent yield (up to 96%) and broad substrate scope. Derivatives of drug compounds and natural products are incorporated. The combination of this ring expansion in a three-step N-H insertion/cyclization/expansion sequence is applied to directly access medicinally relevant scaffolds from acyclic precursors.
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Affiliation(s)
- Alexander J Boddy
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus, Wood Lane , London W12 0BZ , U.K
| | - Christopher J Cordier
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus, Wood Lane , London W12 0BZ , U.K
| | - Kristin Goldberg
- Medicinal Chemistry, Oncology , IMED Biotech Unit , AstraZeneca , Cambridge CB4 0WG , U.K
| | - Andrew Madin
- Hit Discovery, Discovery Sciences, IMED Biotech Unit , AstraZeneca , Cambridge CB4 0WG , U.K
| | - Alan C Spivey
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus, Wood Lane , London W12 0BZ , U.K
| | - James A Bull
- Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus, Wood Lane , London W12 0BZ , U.K
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