51
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The Role of the Catalyst on the Reactivity and Mechanism in the Diels–Alder Cycloaddition Step of the Povarov Reaction for the Synthesis of a Biological Active Quinoline Derivative: Experimental and Theoretical Investigations. ORGANICS 2021. [DOI: 10.3390/org2010006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
An experimental and theoretical study of the reactivity and mechanism of the non-catalyzed and catalyzed Povarov reaction for the preparation of a 4-ethoxy-2,3,4,4a-tetrahydro-2-phenylquinoline as a biological active quinoline derivative has been performed. The optimization of experimental conditions indicate that the use of a catalyst, namely Lewis acid with an electron-releasing group, creates the best experimental conditions for this kind of reaction. The chemical structure was characterized by the usual spectroscopic methods. The prepared quinoline derivative has been also tested in vitro for antibacterial activity, which displays moderate inhibitory activity against both Escherichia coli and Staphylococcus aureus. The antioxidant activity was investigated in vitro by evaluating their reaction with 1,1-diphenyl-2-picrylhydrazyl DPPH radical, which reveals high reactivity. The computational study was performed on the Diels–Alder step of the Povarov reaction using a B3LYP/6-31G(d,p) level of theory. The conceptual DFT reactivity indices explain well the reactivity and the meta regioselectivity experimentally observed. Both catalysts enhance the reactivity of the imine, favoring the formation of the meta regioisomers with a low activation energy, and they change the mechanism to highly synchronous for the Lewis acid and to stepwise for the Brønsted acid. The reaction of imine with allyl alcohol does not give any product, which requires high activation energy.
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52
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Wiesenfeldt MP, Moock D, Paul D, Glorius F. Enantioselective hydrogenation of annulated arenes: controlled formation of multiple stereocenters in adjacent rings. Chem Sci 2021; 12:5611-5615. [PMID: 34163775 PMCID: PMC8179591 DOI: 10.1039/d0sc07099h] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 03/03/2021] [Indexed: 11/21/2022] Open
Abstract
We report a method for the enantioselective hydrogenation of annulated arenes using 4H-pyrido[1,2-a]pyrimidinones as substrates. The method selectively generates multiple stereocenters in adjacent rings leading to architecturally complex motifs, which resemble bioactive molecules. The mechanistic study of the stereochemical outcome revealed that the catalyst is able to overcome substrate stereocontrol providing all-cis-substituted products predominantly. In a sequential protocol, a matching interaction between catalyst and substrate stereocontrol is achieved that facilitates diastereo- and enantioselective access to trans-products.
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Affiliation(s)
- Mario P Wiesenfeldt
- Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut Corrensstraße 40 48149 Münster Germany
| | - Daniel Moock
- Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut Corrensstraße 40 48149 Münster Germany
| | - Daniel Paul
- Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut Corrensstraße 40 48149 Münster Germany
| | - Frank Glorius
- Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut Corrensstraße 40 48149 Münster Germany
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53
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Holmberg-Douglas N, Choi Y, Aquila B, Huynh H, Nicewicz DA. β-Functionalization of Saturated Aza-Heterocycles Enabled by Organic Photoredox Catalysis. ACS Catal 2021; 11:3153-3158. [DOI: 10.1021/acscatal.1c00099] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Natalie Holmberg-Douglas
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Younggi Choi
- Alkermes, Inc, 852 Winter Street, Waltham, Massachusetts 02451-1420, United States
| | - Brian Aquila
- Alkermes, Inc, 852 Winter Street, Waltham, Massachusetts 02451-1420, United States
| | - Hoan Huynh
- Alkermes, Inc, 852 Winter Street, Waltham, Massachusetts 02451-1420, United States
| | - David A. Nicewicz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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54
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Kim JH, Paul A, Ghiviriga I, Seidel D. α-C-H Bond Functionalization of Unprotected Alicyclic Amines: Lewis-Acid-Promoted Addition of Enolates to Transient Imines. Org Lett 2021; 23:797-801. [PMID: 33464093 PMCID: PMC7924990 DOI: 10.1021/acs.orglett.0c04024] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Enolizable cyclic imines, obtained in situ from their corresponding lithium amides by oxidation with simple ketone oxidants, are readily alkylated with a range of enolates to provide mono- and polycyclic β-aminoketones in a single operation, including the natural product (±)-myrtine. Nitrile anions also serve as competent nucleophiles in these transformations, which are promoted by BF3 etherate. β-Aminoesters derived from ester enolates can be converted to the corresponding β-lactams.
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Affiliation(s)
- Jae Hyun Kim
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Ion Ghiviriga
- Center for NMR Spectroscopy, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
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55
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Paul A, Kim JH, Daniel SD, Seidel D. Diversification of Unprotected Alicyclic Amines by C-H Bond Functionalization: Decarboxylative Alkylation of Transient Imines. Angew Chem Int Ed Engl 2021; 60:1625-1628. [PMID: 32975859 PMCID: PMC7854982 DOI: 10.1002/anie.202011641] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/24/2020] [Indexed: 12/13/2022]
Abstract
Despite extensive efforts by many practitioners in the field, methods for the direct α-C-H bond functionalization of unprotected alicyclic amines remain rare. A new advance in this area utilizes N-lithiated alicyclic amines. These readily accessible intermediates are converted to transient imines through the action of a simple ketone oxidant, followed by alkylation with a β-ketoacid under mild conditions to provide valuable β-amino ketones with unprecedented ease. Regioselective α'-alkylation is achieved for substrates with existing α-substituents. The method is further applicable to the convenient one-pot synthesis of polycyclic dihydroquinolones through the incorporation of a SN Ar step.
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Affiliation(s)
- Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Jae Hyun Kim
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
- Current address: College of Pharmacy, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Scott D Daniel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
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56
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Abstract
Amines such as 1,2,3,4-tetrahydroisoquinoline undergo redox-neutral annulations with ortho-(nitromethyl)benzaldehyde. Benzoic acid acts as a promoter in these reactions, which involve concurrent amine α-C-H bond and N-H bond functionalization. Subsequent removal of the nitro group provides access to tetrahydroprotoberberines not accessible via typical redox-annulations. Also reported are decarboxylative annulations of ortho-(nitromethyl)benzaldehyde with proline and pipecolic acid.
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Affiliation(s)
- Dillon R L Rickertsen
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
| | - Longle Ma
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
| | - Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
| | - Khalil A Abboud
- Center for X-ray Crystallography, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
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57
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Murugesh V, Sahoo AR, Achard M, Sharma GVM, Bruneau C, Suresh S. Ruthenium Catalyzed Regioselective β‐C(
sp
3
)−H Functionalization of
N
‐Alkyl‐
N′
‐
p–
nitrophenyl Substituted Piperazines using Aldehydes as Alkylating Agents. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- V. Murugesh
- Department of Organic Synthesis and Process Chemistry CSIR-Indian Institute of Chemical Technology (CSIR-IICT) Hyderabad 500 007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Apurba Ranjan Sahoo
- Univ Rennes CNRS, ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226 F 35000 Rennes France
| | - Mathieu Achard
- Univ Rennes CNRS, ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226 F 35000 Rennes France
| | - Gangavaram V. M. Sharma
- Department of Organic Synthesis and Process Chemistry CSIR-Indian Institute of Chemical Technology (CSIR-IICT) Hyderabad 500 007 India
| | - Christian Bruneau
- Univ Rennes CNRS, ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226 F 35000 Rennes France
| | - Surisetti Suresh
- Department of Organic Synthesis and Process Chemistry CSIR-Indian Institute of Chemical Technology (CSIR-IICT) Hyderabad 500 007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
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58
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Tang SQ, Leloire M, Schneider S, Mohr J, Bricard J, Gizzi P, Garnier D, Schmitt M, Bihel F. Diastereoselective Synthesis of Nonplanar 3-Amino-1,2,4-oxadiazine Scaffold: Structure Revision of Alchornedine. J Org Chem 2020; 85:15347-15359. [PMID: 33197185 DOI: 10.1021/acs.joc.0c01764] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we report the diastereoselective synthesis of a 3-amino-1,2,4-oxadiazine (AOXD) scaffold. The presence of a N-O bond in the ring prevents the planar geometry of the aromatic system and induces a strong decrease in the basicity of the guanidine moiety. While DIBAL-H appeared to be the most efficient reducing agent because it exhibited high diastereoselectivity, we observed various behaviors of the Mitsunobu reaction on the resulting β-aminoalcohol, leading to either inversion or retention of the configuration depending on the steric hindrance in the vicinity of the hydroxy group. The physicochemical properties (pKa and log D) and hepatic stability of several AOXD derivatives were experimentally determined and found that the AOXD scaffold possesses promising properties for drug development. Moreover, we synthesized alchornedine, the only natural product with the AOXD scaffold. Based on a comparison of the analytical data, we found that the reported structure of alchornedine was incorrect and hypothesized a new one.
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Affiliation(s)
- Shuang-Qi Tang
- Laboratoire d'Innovation Thérapeutique, Labex Médalis, UMR7200, CNRS, Université de Strasbourg, Faculty of Pharmacy, 74 Route du Rhin, 67401 Illkirch-Graffenstaden, France
| | - Maeva Leloire
- Laboratoire d'Innovation Thérapeutique, Labex Médalis, UMR7200, CNRS, Université de Strasbourg, Faculty of Pharmacy, 74 Route du Rhin, 67401 Illkirch-Graffenstaden, France
| | - Séverine Schneider
- Laboratoire d'Innovation Thérapeutique, Labex Médalis, UMR7200, CNRS, Université de Strasbourg, Faculty of Pharmacy, 74 Route du Rhin, 67401 Illkirch-Graffenstaden, France
| | - Julie Mohr
- Laboratoire d'Innovation Thérapeutique, Labex Médalis, UMR7200, CNRS, Université de Strasbourg, Faculty of Pharmacy, 74 Route du Rhin, 67401 Illkirch-Graffenstaden, France
| | - Jacques Bricard
- Laboratoire d'Innovation Thérapeutique, Labex Médalis, UMR7200, CNRS, Université de Strasbourg, Faculty of Pharmacy, 74 Route du Rhin, 67401 Illkirch-Graffenstaden, France
| | - Patrick Gizzi
- CBIS, UMS3286, CNRS, Université de Strasbourg, ESBS, Pôle API, 300 Bd Sébastien Brant, 67400 Illkirch-Graffenstaden, France
| | - Delphine Garnier
- Plateforme d'Analyse Chimique de Strasbourg-Illkirch, Faculty of Pharmacy, Université de Strasbourg, 74 Route du Rhin, 67401 Illkirch-Graffenstaden, France
| | - Martine Schmitt
- Laboratoire d'Innovation Thérapeutique, Labex Médalis, UMR7200, CNRS, Université de Strasbourg, Faculty of Pharmacy, 74 Route du Rhin, 67401 Illkirch-Graffenstaden, France
| | - Frédéric Bihel
- Laboratoire d'Innovation Thérapeutique, Labex Médalis, UMR7200, CNRS, Université de Strasbourg, Faculty of Pharmacy, 74 Route du Rhin, 67401 Illkirch-Graffenstaden, France
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59
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Paul A, Kim JH, Daniel SD, Seidel D. Diversification of Unprotected Alicyclic Amines by C−H Bond Functionalization: Decarboxylative Alkylation of Transient Imines. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202011641] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry University of Florida Gainesville FL 32611 USA
| | - Jae Hyun Kim
- Center for Heterocyclic Compounds, Department of Chemistry University of Florida Gainesville FL 32611 USA
- Current address: College of Pharmacy Kangwon National University Chuncheon 24341 Republic of Korea
| | - Scott D. Daniel
- Center for Heterocyclic Compounds, Department of Chemistry University of Florida Gainesville FL 32611 USA
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry University of Florida Gainesville FL 32611 USA
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60
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Ong DY, Chen JH, Chiba S. Reductive Functionalization of Carboxamides: A Recent Update. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200182] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Derek Yiren Ong
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Jia-hua Chen
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Shunsuke Chiba
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
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61
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Zhou G, Deng X, Pan C, Goh ETL, Lakshminarayanan R, Srinivasan R. SLAP reagents for the photocatalytic synthesis of C3/C5-substituted, N-unprotected selenomorpholines and 1,4-selenazepanes. Chem Commun (Camb) 2020; 56:12546-12549. [PMID: 32940282 DOI: 10.1039/d0cc04471g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Herein, we disclose the first set of unique selenium-containing SLAP (SiLicon Amine Protocol) reagents for the direct synthesis of C3/C5-substituted selenomorpholines and 1,4-selenazepanes from diverse (hetero)aldehydes under mild photocatalytic conditions. Enantiomerically pure 1,2-amino alcohol/α-amino acid versions of these heterocycles were also synthesized. Further, we have shown the late-stage modification of certain biologically active agents using the developed seleno-SLAP reagents.
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Affiliation(s)
- Guan Zhou
- School of Pharmaceutical Science and Technology (SPST), Tianjin University, Building 24, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China.
| | - Xingwang Deng
- School of Pharmaceutical Science and Technology (SPST), Tianjin University, Building 24, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China.
| | - Chenyu Pan
- School of Pharmaceutical Science and Technology (SPST), Tianjin University, Building 24, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China.
| | - Eunice Tze Leng Goh
- Anti-Infectives Research Group, Singapore Eye Research Institute, The Academia, 20 College Road, Discovery Tower, Singapore 169856, Singapore
| | - Rajamani Lakshminarayanan
- Anti-Infectives Research Group, Singapore Eye Research Institute, The Academia, 20 College Road, Discovery Tower, Singapore 169856, Singapore and Department of Pharmacy, National University of Singapore, 18 Science Drive, Singapore 117543, Singapore.
| | - Rajavel Srinivasan
- School of Pharmaceutical Science and Technology (SPST), Tianjin University, Building 24, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China.
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62
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Enantioselective Intramolecular [2,3]‐Sigmatropic Rearrangement of Aldehydes via a Sulfonium Enamine Intermediate. Angew Chem Int Ed Engl 2020; 59:20904-20908. [DOI: 10.1002/anie.202010234] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 08/05/2020] [Indexed: 11/07/2022]
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63
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Li L, Chen B, Chen J, Huang Y. Enantioselective Intramolecular [2,3]‐Sigmatropic Rearrangement of Aldehydes via a Sulfonium Enamine Intermediate. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Li Li
- Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong SAR China
| | - Baoli Chen
- Pingshan Translational Medicine Center Shenzhen Bay Laboratory Shenzhen 518055 China
- Shenzhen Public Platform of Drug Screening and Preclinical Evaluation Peking University Shenzhen Graduate School Shenzhen 518055 China
| | - Jiean Chen
- Pingshan Translational Medicine Center Shenzhen Bay Laboratory Shenzhen 518055 China
- Shenzhen Public Platform of Drug Screening and Preclinical Evaluation Peking University Shenzhen Graduate School Shenzhen 518055 China
| | - Yong Huang
- Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong SAR China
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64
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Kleban I, Krokhmaliuk Y, Reut S, Shuvakin S, Pendyukh VV, Khyzhan OI, Yarmoliuk DS, Tymtsunik AV, Rassukana YV, Grygorenko OO. Multigram Synthesis of Heterabicyclo[n.1.0]alkan‐1‐yl Trifluoroborates. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000977] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Ihor Kleban
- Enamine Ltd. Chervonotkatska 78 02094 Kyiv Ukraine
- Institute of Organic Chemistry National Academy of Sciences of Ukraine Murmanska Street 5 02094 Kyiv Ukraine
| | - Yevhen Krokhmaliuk
- Enamine Ltd. Chervonotkatska 78 02094 Kyiv Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 01601 Kyiv Ukraine
| | - Sofiia Reut
- Enamine Ltd. Chervonotkatska 78 02094 Kyiv Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 01601 Kyiv Ukraine
| | - Serhii Shuvakin
- Enamine Ltd. Chervonotkatska 78 02094 Kyiv Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 01601 Kyiv Ukraine
| | | | | | | | - Andriy V. Tymtsunik
- Enamine Ltd. Chervonotkatska 78 02094 Kyiv Ukraine
- National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” Prospect Peremogy 37 03056 Kyiv Ukraine
| | - Yuliya V. Rassukana
- Institute of Organic Chemistry National Academy of Sciences of Ukraine Murmanska Street 5 02094 Kyiv Ukraine
- National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” Prospect Peremogy 37 03056 Kyiv Ukraine
| | - Oleksandr O. Grygorenko
- Enamine Ltd. Chervonotkatska 78 02094 Kyiv Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 01601 Kyiv Ukraine
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65
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Konishi K, Yasui M, Okuhira H, Takeda N, Ueda M. Copper-Catalyzed Sequential Cyclization/Migration of Alkynyl Hydrazides for Construction of Ring-Expanded N-N Fused Pyrazolones. Org Lett 2020; 22:6852-6857. [PMID: 32822198 DOI: 10.1021/acs.orglett.0c02378] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A copper-catalyzed sequential cyclization/migration reaction of alkynyl hydrazides for the synthesis of ring-expanded N-N fused pyrazolones was developed. Control experiments indicate that the copper-ligand complex plays an essential role in the reaction. This approach features a broad scope including some functional group tolerance as well as a nucleophilic addition/1,3-migration/formal 1,2-migration sequence. This protocol provides simple manipulation and less waste due to high yield and atom economy. The synthetic utility of N-N fused pyrazolones was also demonstrated by further transformations.
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Affiliation(s)
- Keiji Konishi
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Motohiro Yasui
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Hitomi Okuhira
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Norihiko Takeda
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Masafumi Ueda
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
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66
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Yang Y, Fu R, Liu Y, Cai J, Zeng X. Microwave-promoted one-pot three-component synthesis of 2,3-dihydroquinazolin-4(1H)-ones catalyzed by heteropolyanion-based ionic liquids under solvent-free conditions. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131312] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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67
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Farah AO, Rabah M, Beng TK. Transition metal-free domino acyl substitution/Michael addition of alkenyl Grignard reagents to lactam esters: synthesis of lactam-bearing homoallylic ketones. RSC Adv 2020; 10:22454-22459. [PMID: 35514603 PMCID: PMC9054586 DOI: 10.1039/d0ra03885g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 06/07/2020] [Indexed: 11/21/2022] Open
Abstract
A solvent-controlled protocol for the direct and transition metal-free addition of alkenyl Grignard reagents to vicinally functionalized sp3-rich morpholinones has been developed, leading to the chemo and regioselective synthesis of lactam-bearing homoallylic ketones. The addition of lithium chloride proved to be essential. In cases where a new stereocenter is generated, the doubly branched homoallylic ketones are obtained in unexpectedly high diastereoselectivities. Efforts to extend the methodology to other heterosubstituted lactams revealed some important reactivity and selectivity differences. A solvent-controlled and heteroatom-dictated protocol for the transition metal-free addition of alkenyl Grignard reagents to lactam esters has been developed, leading to the chemo- and regioselective synthesis of lactam-tethered homoallylic ketones.![]()
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Affiliation(s)
- Abdikani Omar Farah
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Muhannad Rabah
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Timothy K Beng
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
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68
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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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69
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Savela R, Vogt D, Leino R. Ruthenium Catalyzed N
-Alkylation of Cyclic Amines with Primary Alcohols. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Risto Savela
- Laboratory of Molecular Science and Technology; Åbo Akademi University; Biskopsgatan 8 20500 Åbo Finland
| | - Dieter Vogt
- Laboratory of Industrial Chemistry; Department of Biochemical and Chemical Engineering; Technical University of Dortmund; Emil-Figge-Str. 66 44227 Dortmund Germany
| | - Reko Leino
- Laboratory of Molecular Science and Technology; Åbo Akademi University; Biskopsgatan 8 20500 Åbo Finland
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70
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Synthesis and Evaluation of Antimicrobial Activities of Novel N-Substituted Indole Derivatives. J CHEM-NY 2020. [DOI: 10.1155/2020/4358453] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Indole motifs are one of the most significant scaffolds in the discovery of new drugs. We have described a synthesis of new N-substituted indole derivatives (1-3), and their in vitro antimicrobial activities were investigated. The synthesis of titled compounds has been demonstrated by utilizing commercially available starting materials. The antibacterial and antifungal activities were performed using new strains of bacteria Staphylococcus aureus, Escherichia coli, and Candida albicans using the disc diffusion method. Notably, the compound 4-(1-(2-(1H-indol-1-yl) ethoxy) pentyl)-N,N-dimethyl aniline (1) was found to be most potent than the other analogues (2 and 3), which has shown higher inhibition than the standard drug chloramphenicol.
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71
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Rapid functionalization of multiple C-H bonds in unprotected alicyclic amines. Nat Chem 2020; 12:545-550. [PMID: 32231260 DOI: 10.1038/s41557-020-0438-z] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 02/10/2020] [Indexed: 11/09/2022]
Abstract
The synthesis of valuable bioactive alicyclic amines containing variable substituents in multiple ring positions typically relies on multistep synthetic sequences that frequently require the introduction and subsequent removal of undesirable protecting groups. Although a vast number of studies have aimed to simplify access to such materials through the C-H bond functionalization of feedstock alicyclic amines, the simultaneous introduction of more than one substituent to unprotected amines has never been accomplished. Here we report an advance in C-H bond functionalization methodology that enables the introduction of up to three substituents in a single operation. Lithiated amines are first exposed to a ketone oxidant, generating transient imines that are subsequently converted to endocyclic 1-azaallyl anions, which can be processed further to furnish β-substituted, α,β-disubstituted, or α,β,α'-trisubstituted amines. This study highlights the unique utility of in situ-generated endocyclic 1-azaallyl anions, elusive intermediates in synthetic chemistry.
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72
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Liu W, Babl T, Röther A, Reiser O, Davies HML. Functionalization of Piperidine Derivatives for the Site-Selective and Stereoselective Synthesis of Positional Analogues of Methylphenidate. Chemistry 2020; 26:4236-4241. [PMID: 31873946 PMCID: PMC7187323 DOI: 10.1002/chem.201905773] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Indexed: 12/13/2022]
Abstract
Rhodium‐catalyzed C−H insertions and cyclopropanations of donor/acceptor carbenes have been used for the synthesis of positional analogues of methylphenidate. The site selectivity is controlled by the catalyst and the amine protecting group. C−H functionalization of N‐Boc‐piperidine using Rh2(R‐TCPTAD)4, or N‐brosyl‐piperidine using Rh2(R‐TPPTTL)4 generated 2‐substitited analogues. In contrast, when N‐α‐oxoarylacetyl‐piperidines were used in combination with Rh2(S‐2‐Cl‐5‐BrTPCP)4, the C−H functionalization produced 4‐susbstiuted analogues. Finally, the 3‐substituted analogues were prepared indirectly by cyclopropanation of N‐Boc‐tetrahydropyridine followed by reductive regio‐ and stereoselective ring‐opening of the cyclopropanes.
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Affiliation(s)
- Wenbin Liu
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA, 30322, USA
| | - Tobias Babl
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA, 30322, USA.,Institute of Organic Chemistry, University of Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany
| | - Alexander Röther
- Institute of Organic Chemistry, University of Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany
| | - Oliver Reiser
- Institute of Organic Chemistry, University of Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany
| | - Huw M L Davies
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA, 30322, USA
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73
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Cogswell TJ, Donald CS, Marquez R. Rapid, two-pot procedure for the synthesis of dihydropyridinones; total synthesis of aza-goniothalamin. Beilstein J Org Chem 2020; 16:135-139. [PMID: 32082432 PMCID: PMC7006497 DOI: 10.3762/bjoc.16.15] [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: 10/06/2019] [Accepted: 01/16/2020] [Indexed: 02/05/2023] Open
Abstract
A fast, protecting-group-free synthesis of dihydropyridinones has been developed. Starting from commercially available aldehydes, a novel one-pot amidoallylation gave access to diene compounds in good yields. Ring-closing metathesis conditions were then employed to produce the target dihydropyridinones efficiently and in high yields.
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Affiliation(s)
| | - Craig S Donald
- Lucideon Limited., Queens Road, Penkhull, Stoke-on-Trent, Staffordshire, ST4 7LQ, U.K
| | - Rodolfo Marquez
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, U.K.,School of Physical and Chemical Sciences, University of Canterbury, Christchurch, 8140, New Zealand
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74
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Shen YB, Wang LX, Sun YM, Dong FY, Yu L, Liu Q, Xiao J. Hexafluoroisopropanol-Mediated Redox-Neutral α-C(sp 3)-H Functionalization of Cyclic Amines via Hydride Transfer. J Org Chem 2020; 85:1915-1926. [PMID: 31823616 DOI: 10.1021/acs.joc.9b02606] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Hexafluoroisopropanol has been demonstrated as the versatile promoter for redox-neutral α-C(sp3)-H functionalization of cyclic amines via the cascade [1,5]-hydride transfer/cyclization strategy. A wide range of cyclic amines are functionalized into bioactive tetrahydroquinolines, quinazolines, benzoxazines, and benzotriazepines in moderate to excellent yields. This protocol features additive-free conditions, operational simplicity, and wide substrate scope.
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Affiliation(s)
| | | | | | | | | | - Qing Liu
- College of Chemical and Environmental Engineering , Shandong University of Science and Technology , Qingdao 266590 , China
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75
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Paul A, Chandak HS, Ma L, Seidel D. Redox-Annulations of Cyclic Amines with ortho-Cyanomethylbenzaldehydes. Org Lett 2020; 22:976-980. [PMID: 31984752 DOI: 10.1021/acs.orglett.9b04506] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Amines such as 1,2,3,4-tetrahydroisoquinoline undergo redox-neutral annulations with ortho-cyanomethylbenzaldehydes. These amine α-C-H bond functionalization reactions are promoted by acetic acid. The resulting β-aminonitriles can be converted to the corresponding β-aminoalcohols in diastereoselective fashion.
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Affiliation(s)
- Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States.,Department of Chemistry and Chemical Biology , Rutgers, The State University of New Jersey , Piscataway , New Jersey 08854 , United States
| | - Hemant S Chandak
- Department of Chemistry and Chemical Biology , Rutgers, The State University of New Jersey , Piscataway , New Jersey 08854 , United States
| | - Longle Ma
- Department of Chemistry and Chemical Biology , Rutgers, The State University of New Jersey , Piscataway , New Jersey 08854 , United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States.,Department of Chemistry and Chemical Biology , Rutgers, The State University of New Jersey , Piscataway , New Jersey 08854 , United States
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76
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77
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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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78
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Beng TK, Moreno A. Copper-catalyzed alkenylation of novel N-iodoarylated allylic ketopiperazinonates with unactivated alkenes. NEW J CHEM 2020. [DOI: 10.1039/c9nj06178a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Novel N-iodoarylated allylic ketopiperazines have been engaged in a CuBr-catalyzed alkenylation protocol with simple alkenes, leading to epimerization-free, efficient, and regioselective synthesis of N-stilbeno-ketopiperazines
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Affiliation(s)
- Timothy K. Beng
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Antonio Moreno
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
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79
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Beng TK, Garcia J, Smith M, Orellana AO. Skeletal remodelling of α-substituted cyclic eneformamides to α-ketonyl cyclic amines. NEW J CHEM 2020. [DOI: 10.1039/d0nj02768e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A modular dehomologation strategy, which skeletally remodels cyclic α-substituted eneformamides to one-carbon shorter α-ketonyl saturated cyclic amines is described.
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Affiliation(s)
- Timothy K. Beng
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Jorge Garcia
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Meagan Smith
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
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80
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Beng TK, Farah AO, Shearer V. Modular synthesis and transition metal-free alkynylation/alkenylation of Castagnoli–Cushman-derived N, O- and N, S-heterocyclic vinyl chlorides. RSC Adv 2020; 10:37153-37160. [PMID: 35521247 PMCID: PMC9057152 DOI: 10.1039/d0ra06619b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 10/03/2020] [Indexed: 11/21/2022] Open
Abstract
A modular and functional group-tolerant protocol for the transition metal-free coupling of novel N,O- and N,S-heterocyclic vinyl chlorides with terminal acetylenes and styrenes has been developed, leading to the epimerization-free synthesis of fully carbofunctionalized dihydro-1,4-oxazines/thiazines. Bicyclic morpholines have also been prepared through the interrogation of newly synthesized cross-conjugated dienes in Diels–Alder reactions. The use of environmentally benign reaction media endows the current strategy with a practical advantage. A functional group-tolerant and transition metal-free coupling of novel N,O- and N,S-heterocyclic vinyl chlorides, which affords fully carbosubstituted dihydro-1,4-oxazines/thiazines as well as bicyclic morpholines, is described.![]()
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Affiliation(s)
- Timothy K. Beng
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | | | - Victoria Shearer
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
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81
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Luo L, Li H, Liu J, Zhou Y, Dong L, Xiao YC, Chen FE. Transition-metal and oxidant-free approach for the synthesis of diverse N-heterocycles by TMSCl activation of isocyanides. RSC Adv 2020; 10:29257-29262. [PMID: 35521093 PMCID: PMC9055958 DOI: 10.1039/d0ra04636a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 07/07/2020] [Indexed: 01/27/2023] Open
Abstract
A highly efficient TMSCl-mediated addition of N-nucleophiles to isocyanides has been achieved. This transition-metal and oxidant-free strategy has been applied to the construction of various N-heterocyles such as quinazolinone, benzimidazole and benzothiazole derivatives by the use of distinct amino-based binucleophiles. The notable feature of this protocol includes its mild reaction condition, broad functional group tolerance and excellent yield. A highly efficient TMSCl-mediated addition of N-nucleophiles to isocyanides has been achieved.![]()
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Affiliation(s)
- Liangliang Luo
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu
- China
| | - Hongyan Li
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu
- China
| | - Jinxin Liu
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu
- China
| | - Yuan Zhou
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu
- China
| | - Lin Dong
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu
- China
| | - You-Cai Xiao
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu
- China
| | - Fen-Er Chen
- Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu
- China
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82
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Zhao Z, Kong X, Wang W, Hao J, Wang Y. Direct Use of Unprotected Aliphatic Amines to Generate N-Heterocycles via β-C–H Malonylation with Iodonium Ylide. Org Lett 2019; 22:230-233. [DOI: 10.1021/acs.orglett.9b04213] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Zhiguo Zhao
- School of Chemistry and Chemical Engineering, Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, Shandong, China
| | - Xiangjin Kong
- School of Chemistry and Chemical Engineering, Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, Shandong, China
| | - Wei Wang
- School of Chemistry and Chemical Engineering, Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, Shandong, China
| | - Jingcheng Hao
- School of Chemistry and Chemical Engineering, Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, Shandong, China
| | - Yao Wang
- School of Chemistry and Chemical Engineering, Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, Shandong, China
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83
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Aubineau T, Cossy J. Metal-Catalyzed Cyclization: Synthesis of (Benzo)morpholines and (Benzo)[1,4]dihydrooxazines. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900927] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Thomas Aubineau
- Molecular, Macromolecular Chemistry and Materials, ESPCI Paris, CNRS; PSL University; 10 rue Vauquelin 75005 Paris France
| | - Janine Cossy
- Molecular, Macromolecular Chemistry and Materials, ESPCI Paris, CNRS; PSL University; 10 rue Vauquelin 75005 Paris France
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84
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González J, Schäfer P, Fletcher SP. Highly Enantioselective Hiyama Cross-Coupling via Rh-Catalyzed Allylic Arylation of Racemic Allyl Chlorides. Organometallics 2019; 38:3991-3995. [PMID: 32055086 PMCID: PMC7009026 DOI: 10.1021/acs.organomet.9b00197] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Indexed: 01/17/2023]
Abstract
Highly enantioselective Hiyama cross-coupling reactions have been achieved through rhodium(I)-catalyzed dynamic kinetic asymmetric transformations between aryl siloxanes and cyclic racemic allyl halides. This process affords valuable enantiomerically enriched aryl-substituted cyclic allyl products and is compatible with heterocyclic allyl chloride electrophiles.
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Affiliation(s)
- Jesús González
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Philipp Schäfer
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Stephen P. Fletcher
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
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85
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Fe3O4@zeolite-SO3H as a magnetically bifunctional and retrievable nanocatalyst for green synthesis of perimidines. RESEARCH ON CHEMICAL INTERMEDIATES 2019. [DOI: 10.1007/s11164-019-03992-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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86
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González J, van Dijk L, Goetzke FW, Fletcher SP. Highly enantioselective rhodium-catalyzed cross-coupling of boronic acids and racemic allyl halides. Nat Protoc 2019; 14:2972-2985. [PMID: 31541227 DOI: 10.1038/s41596-019-0209-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 06/06/2019] [Indexed: 11/09/2022]
Abstract
Although Csp2-Csp2 Suzuki-Miyaura couplings (SMCs) are widely used in small-molecule synthesis, related methods that allow the incorporation of Csp3-hybridized coupling partners, particularly in an asymmetric manner, are less developed. This protocol describes catalytic asymmetric SMC reactions that provide access to enantiomerically enriched cyclic allylic products. The method couples racemic allyl halide starting materials with sp2-hybridized boronic acid derivatives and is compatible with heterocyclic coupling partners. These reactions are catalyzed by a rhodium-ligand complex and typically display very high levels of enantioselectivity (>95% enantiomeric excess (ee)). In this protocol, we detail a procedure using a dihydropyridine-derived allyl chloride for the synthesis of (-)-(S)-tert-butyl-3-(4-bromophenyl)-3,6-dihydropyridine-1(2H)-carboxylate, an intermediate in the synthesis of the anticancer drug niraparib. This procedure affords 1.17 g (86% yield) of the coupling product with 96% ee. The initial experimental setup of the reaction takes 45-50 min, and the reaction is complete within 4-5 h.
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Affiliation(s)
- Jesús González
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Lucy van Dijk
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - F Wieland Goetzke
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Stephen P Fletcher
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK.
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87
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Mannisto JK, Sahari A, Lagerblom K, Niemi T, Nieger M, Sztanó G, Repo T. One‐Step Synthesis of 3,4‐Disubstituted 2‐Oxazolidinones by Base‐Catalyzed CO
2
Fixation and Aza‐Michael Addition. Chemistry 2019; 25:10284-10289. [DOI: 10.1002/chem.201902451] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Jere K. Mannisto
- Department of ChemistryUniversity of Helsinki, P.O. Box 55 A.I. Virtasen aukio 1 00014 Helsinki Finland
| | - Aleksi Sahari
- Department of ChemistryUniversity of Helsinki, P.O. Box 55 A.I. Virtasen aukio 1 00014 Helsinki Finland
| | - Kalle Lagerblom
- Department of ChemistryUniversity of Helsinki, P.O. Box 55 A.I. Virtasen aukio 1 00014 Helsinki Finland
| | - Teemu Niemi
- Department of ChemistryUniversity of Helsinki, P.O. Box 55 A.I. Virtasen aukio 1 00014 Helsinki Finland
| | - Martin Nieger
- Department of ChemistryUniversity of Helsinki, P.O. Box 55 A.I. Virtasen aukio 1 00014 Helsinki Finland
| | - Gábor Sztanó
- Department of ChemistryUniversity of Helsinki, P.O. Box 55 A.I. Virtasen aukio 1 00014 Helsinki Finland
| | - Timo Repo
- Department of ChemistryUniversity of Helsinki, P.O. Box 55 A.I. Virtasen aukio 1 00014 Helsinki Finland
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88
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Chu X, Ge D, Wang M, Rao W, Loh T, Shen Z. Chemo‐ and Regioselective Ring Construction Driven by Visible‐Light Photoredox Catalysis: an Access to Fluoroalkylated Oxazolidines Featuring an All‐Substituted Carbon Stereocenter. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900585] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Xue‐Qiang Chu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 People's Republic of China
| | - Danhua Ge
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 People's Republic of China
| | - Mao‐Lin Wang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 People's Republic of China
| | - Weidong Rao
- Jiangsu Key Laboratory of Biomass-based Green Fuels and Chemicals, College of Chemical Engineering Nanjing Forestry University Nanjing 210037 People's Republic of China
| | - Teck‐Peng Loh
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 People's Republic of China
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Zhi‐Liang Shen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 People's Republic of China
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89
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Borlinghaus N, Weinmann L, Krimpzer F, Scheller PN, Al‐Shameri A, Lauterbach L, Coquel A, Lattemann C, Hauer B, Nestl BM. Cascade Biotransformation to Access 3‐Methylpiperidine in Whole Cells. ChemCatChem 2019. [DOI: 10.1002/cctc.201900702] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Niels Borlinghaus
- Institute of Biochemistry and Technical BiochemistryDepartment of Technical BiochemistryUniversität Stuttgart Allmandring 31 Stuttgart 70569 Germany
| | - Leonie Weinmann
- Institute of Biochemistry and Technical BiochemistryDepartment of Technical BiochemistryUniversität Stuttgart Allmandring 31 Stuttgart 70569 Germany
| | - Florian Krimpzer
- Sanofi Chimie, Pharmaceutics Development Platform Impasse des Ateliers 1 Vitry sur Seine 94400 France
| | - Philipp N. Scheller
- Institute of Biochemistry and Technical BiochemistryDepartment of Technical BiochemistryUniversität Stuttgart Allmandring 31 Stuttgart 70569 Germany
| | - Ammar Al‐Shameri
- Institute of ChemistryTechnical University of Berlin Strasse des 17. Juni 135 Berlin 10623 Germany
| | - Lars Lauterbach
- Institute of ChemistryTechnical University of Berlin Strasse des 17. Juni 135 Berlin 10623 Germany
| | - Anne‐Sophie Coquel
- Sanofi Chimie, Pharmaceutics Development Platform Impasse des Ateliers 1 Vitry sur Seine 94400 France
| | - Claus Lattemann
- Sanofi Chimie, Pharmaceutics Development Platform Impasse des Ateliers 1 Vitry sur Seine 94400 France
| | - Bernhard Hauer
- Institute of Biochemistry and Technical BiochemistryDepartment of Technical BiochemistryUniversität Stuttgart Allmandring 31 Stuttgart 70569 Germany
| | - Bettina M. Nestl
- Institute of Biochemistry and Technical BiochemistryDepartment of Technical BiochemistryUniversität Stuttgart Allmandring 31 Stuttgart 70569 Germany
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90
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Kiss L, Ouchakour L, Ábrahámi RA, Nonn M. Stereocontrolled Synthesis of Functionalized Azaheterocycles from Carbocycles through Oxidative Ring Opening/Reductive Ring Closing Protocols. CHEM REC 2019; 20:120-141. [PMID: 31250972 DOI: 10.1002/tcr.201900025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 05/23/2019] [Accepted: 05/29/2019] [Indexed: 12/11/2022]
Abstract
Fluorine-containing organic scaffolds are of significant interest in medicinal chemistry. The incorporation of fluorine into biomolecules can lead to remarkable changes in their physical, chemical, and biological properties. There are already many drugs on the market, which contain at least one fluorine atom. Saturated functionalized azaheterocycles as bioactive substances have gained increasing attention in pharmaceutical chemistry. Due to the high biorelevance of organofluorine molecules and the importance of N-heterocyclic compounds, selective stereocontrolled procedures to the access of new fluorine-containing saturated N-heterocycles are considered to be a hot research topic. This account summarizes the synthesis of functionalized and fluorine-containing saturated azaheterocycles starting from functionalized cycloalkenes and based on oxidative ring cleavage of diol intermediates followed by ring expansion with reductive amination.
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Affiliation(s)
- Loránd Kiss
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720, Szeged, Eötvös u. 6, Hungary.,University of Szeged, Interdisciplinary Excellence Centre, Institute of Pharmaceutical Chemistry, Hungary
| | - Lamiaa Ouchakour
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720, Szeged, Eötvös u. 6, Hungary.,University of Szeged, Interdisciplinary Excellence Centre, Institute of Pharmaceutical Chemistry, Hungary
| | - Renáta A Ábrahámi
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720, Szeged, Eötvös u. 6, Hungary
| | - Melinda Nonn
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720, Szeged, Eötvös u. 6, Hungary.,MTA-SZTE Stereochemistry Research Group, Hungarian Academy of Sciences, H-6720, Szeged, Eötvös u. 6, Hungary.,University of Szeged, Interdisciplinary Excellence Centre, Institute of Pharmaceutical Chemistry, Hungary
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91
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Yu JS, Espinosa M, Noda H, Shibasaki M. Traceless Electrophilic Amination for the Synthesis of Unprotected Cyclic β-Amino Acids. J Am Chem Soc 2019; 141:10530-10537. [PMID: 31188574 DOI: 10.1021/jacs.9b05476] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Electrophilic aminations involve an umpolung of a nitrogen atom, providing an alternate, distinctive synthetic strategy. The recent advent of various designed O-substituted hydroxylamines has significantly advanced this research field. An underappreciated issue is atom economy of the transformations: The necessary activating group on the oxygen atom is left in coproduced waste. Herein, we describe Rh-catalyzed electrophilic amination of substituted isoxazolidin-5-ones for the synthesis of unprotected, cyclic β-amino acids featuring either benzo-fused or spirocyclic scaffolds. Using the cyclic hydroxylamines allows for retaining both nitrogen and oxygen functionalities in the product. The traceless, redox neutral process proceeds on a gram scale with as little as 0.1 mol % catalyst loading. In contrast to related electrophilic aminations in the literature, a series of mechanistic experiments suggests a unique pathway involving spirocyclization, followed by the skeletal rearrangement. The insights provided herein shed light on a nuanced reactivity of the active species, Rh-nitrenoid generated from the activated hydroxylamine, and extend the knowledge on electrophilic aromatic substitutions.
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Affiliation(s)
- Jin-Sheng Yu
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Miguel Espinosa
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
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92
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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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93
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Paul A, Seidel D. α-Functionalization of Cyclic Secondary Amines: Lewis Acid Promoted Addition of Organometallics to Transient Imines. J Am Chem Soc 2019; 141:8778-8782. [PMID: 31117670 DOI: 10.1021/jacs.9b04325] [Citation(s) in RCA: 87] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Cyclic imines, generated in situ from their corresponding N-lithiated amines and a ketone hydride acceptor, undergo reactions with a range of organometallic nucleophiles to generate α-functionalized amines in a single operation. Activation of the transient imines by Lewis acids that are compatible with the presence of lithium alkoxides was found to be crucial to accommodate a broad range of nucleophiles including lithium acetylides, Grignard reagents, and aryllithiums with attenuated reactivities.
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Affiliation(s)
- Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
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94
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Bosnidou AE, Duhamel T, Muñiz K. Detection of the Elusive Nitrogen‐Centered Radicals from Catalytic Hofmann–Löffler Reactions. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900497] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Alexandra E. Bosnidou
- The Barcelona Institute of Science and Technology Institute of Chemical Research of Catalonia (ICIQ) Av. Països Catalans 16 43007 Tarragona Spain
- Química Analítica y Química Orgánica Universidad Rovira i Virgili Carrer de Marcel·lí Domingo 1 43007 Tarragona Spain
| | - Thomas Duhamel
- The Barcelona Institute of Science and Technology Institute of Chemical Research of Catalonia (ICIQ) Av. Països Catalans 16 43007 Tarragona Spain
- Facultad de Química Universidad de Oviedo 33006 Oviedo Spain
| | - Kilian Muñiz
- The Barcelona Institute of Science and Technology Institute of Chemical Research of Catalonia (ICIQ) Av. Països Catalans 16 43007 Tarragona Spain
- ICREA, Pg. Lluís Companys 23 08010 Barcelona Spain
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95
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Qiu Z, Zhu M, Zheng L, Li J, Zou D, Wu Y, Wu Y. Regioselective α-benzylation of 3-iodoazetidine via Suzuki cross-coupling. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.04.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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96
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Shang M, Feu KS, Vantourout JC, Barton LM, Osswald HL, Kato N, Gagaring K, McNamara CW, Chen G, Hu L, Ni S, Fernández-Canelas P, Chen M, Merchant RR, Qin T, Schreiber SL, Melillo B, Yu JQ, Baran PS. Modular, stereocontrolled C β-H/C α-C activation of alkyl carboxylic acids. Proc Natl Acad Sci U S A 2019; 116:8721-8727. [PMID: 30996125 PMCID: PMC6500144 DOI: 10.1073/pnas.1903048116] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The union of two powerful transformations, directed C-H activation and decarboxylative cross-coupling, for the enantioselective synthesis of vicinally functionalized alkyl, carbocyclic, and heterocyclic compounds is described. Starting from simple carboxylic acid building blocks, this modular sequence exploits the residual directing group to access more than 50 scaffolds that would be otherwise extremely difficult to prepare. The tactical use of these two transformations accomplishes a formal vicinal difunctionalization of carbon centers in a way that is modular and thus, amenable to rapid diversity incorporation. A simplification of routes to known preclinical drug candidates is presented along with the rapid diversification of an antimalarial compound series.
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Affiliation(s)
- Ming Shang
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Karla S Feu
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | | | - Lisa M Barton
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Heather L Osswald
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Nobutaka Kato
- Chemical Biology and Therapeutics Science Program, Broad Institute, Cambridge, MA 02142
| | - Kerstin Gagaring
- Biology Department, Calibr at The Scripps Research Institute, La Jolla, CA 92037
| | - Case W McNamara
- Biology Department, Calibr at The Scripps Research Institute, La Jolla, CA 92037
| | - Gang Chen
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Liang Hu
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Shengyang Ni
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | | | - Miao Chen
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Rohan R Merchant
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Tian Qin
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Stuart L Schreiber
- Chemical Biology and Therapeutics Science Program, Broad Institute, Cambridge, MA 02142
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138
| | - Bruno Melillo
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037;
- Chemical Biology and Therapeutics Science Program, Broad Institute, Cambridge, MA 02142
| | - Jin-Quan Yu
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037;
| | - Phil S Baran
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037;
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97
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Toghan A, Abo-Bakr AM, Rageh HM, Abd-Elsabour M. Green electrochemical strategy for one-step synthesis of new catechol derivatives. RSC Adv 2019; 9:13145-13152. [PMID: 35520793 PMCID: PMC9063765 DOI: 10.1039/c9ra01206k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Accepted: 04/15/2019] [Indexed: 11/21/2022] Open
Abstract
In this paper, we present promising results in the green electrochemical oxidation of catechol in the presence of three different thiol nucleophiles at the surface of a glassy carbon electrode in an aqueous solution using cyclic voltammetry (CV). The outcome indicated the synthesis of some new heterocyclic compounds functionalized with phenolic, triazole, triazine and pyrimidine groups. The effects of repetitive cycling, nucleophile concentrations and sweep rates were explored to get more information about the systems. The voltammetric data showed that the electro-generated o-benzoquinone is a quite reactive intermediate, which in aqueous solutions can quickly participate in a Michael-addition reaction with any one of the nucleophiles to form the corresponding products. The structures of all newly electro-synthesized compounds were confirmed by elemental analyses and FT-IR, 1H NMR, 13C-NMR and MS spectra. The one-pot synthesis strategy led to new organics with high purities and good yields under green conditions without harmful reagents.
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Affiliation(s)
- Arafat Toghan
- Chemistry Department, Faculty of Science, South Valley University Qena 83523 Egypt
- Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU) Riyadh 11623 Kingdom of Saudi Arabia
| | - Ahmed M Abo-Bakr
- Chemistry Department, Faculty of Science, South Valley University Qena 83523 Egypt
| | - Hesham M Rageh
- Chemistry Department, Faculty of Science, South Valley University Qena 83523 Egypt
| | - Mohamed Abd-Elsabour
- Chemistry Department, Faculty of Science, South Valley University Qena 83523 Egypt
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98
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Shaw M, Kumar A. Visible-Light-Mediated β-C(sp3)–H Amination of Glycosylimidates: En Route to Oxazoline-Fused/Spiro Nonclassical Bicyclic Sugars. Org Lett 2019; 21:3108-3113. [DOI: 10.1021/acs.orglett.9b00763] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mukta Shaw
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India
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99
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Pantaine LRE, Milligan JA, Matsui JK, Kelly CB, Molander GA. Photoredox Radical/Polar Crossover Enables Construction of Saturated Nitrogen Heterocycles. Org Lett 2019; 21:2317-2321. [PMID: 30860849 PMCID: PMC6452489 DOI: 10.1021/acs.orglett.9b00602] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Photoredox-mediated radical/polar crossover (RPC) processes offer new avenues for the synthesis of cyclic molecules. This process has been realized for the construction of medium-sized saturated nitrogen heterocycles. Photocatalytically generated alkyl radicals possessing pendant leaving groups engage imines in C-C bond formation, and subsequent reduction of the intermediate nitrogen-centered radical triggers anionic ring closure. With the aid of visible light irradiation, substituted pyrrolidines, piperidines, and azepanes can be prepared under mild, redox-neutral conditions.
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Affiliation(s)
- Loiïc R. E. Pantaine
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania, 19104-6323, United States
| | - John A. Milligan
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania, 19104-6323, United States
| | - Jennifer K. Matsui
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania, 19104-6323, United States
| | - Christopher B. Kelly
- Department of Chemistry, Virginia Commonwealth University, 1001 West Main Street, P. O. Box 842006 Richmond, VA 23284-9069, United States
- Medicines for All Institute, Virginia Commonwealth University, Biotech 8 737 N. 5 Street, Richmond, VA 23219-1441
| | - Gary A. Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania, 19104-6323, United States
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100
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Paul A, Adili A, Seidel D. Redox-Annulations of Cyclic Amines with Electron-Deficient o-Tolualdehydes. Org Lett 2019; 21:1845-1848. [PMID: 30840479 DOI: 10.1021/acs.orglett.9b00438] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Amines such as 1,2,3,4-tetrahydroisoquinoline undergo redox-neutral annulations with 2-methyl-3,5-dinitrobenzaldehyde and closely related substrates. Acetic acid serves as the solvent and sole promoter of these transformations which involve dual C-H functionalization.
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Affiliation(s)
- Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
| | - Alafate Adili
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
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