51
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Ivanova MV, Bayle A, Besset T, Pannecoucke X, Poisson T. Copper Salt-Controlled Divergent Reactivity of [Cu]CF2
PO(OEt)2
with α-Diazocarbonyl Derivatives. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608294] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Maria V. Ivanova
- Normandie Univ; INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014); 76000 Rouen France
| | - Alexandre Bayle
- Normandie Univ; INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014); 76000 Rouen France
| | - Tatiana Besset
- Normandie Univ; INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014); 76000 Rouen France
| | - Xavier Pannecoucke
- Normandie Univ; INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014); 76000 Rouen France
| | - Thomas Poisson
- Normandie Univ; INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014); 76000 Rouen France
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52
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53
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Enantio-and diastereoselective desymmetrization of α-alkyl-α-diazoesters by dirhodium(II)-catalyzed intramolecular C–H insertion. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.05.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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54
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Wang X, Zhou Y, Qiu L, Yao R, Zheng Y, Zhang C, Bao X, Xu X. Enantioselective Carbene Cascade: An Effective Approach to Cyclopentadienes and Applications in Diels-Alder Reactions. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201501106] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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55
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Candeias NR, Paterna R, Gois PMP. Homologation Reaction of Ketones with Diazo Compounds. Chem Rev 2016; 116:2937-81. [DOI: 10.1021/acs.chemrev.5b00381] [Citation(s) in RCA: 201] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Nuno R. Candeias
- Department
of Chemistry and Bioengineering, Tampere University of Technology, Korkeakoulunkatu 8, Tampere, FI-33101 Finland
| | - Roberta Paterna
- Research
Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidad of Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal
| | - Pedro M. P. Gois
- Research
Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidad of Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal
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56
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DeAngelis A, Panish R, Fox JM. Rh-Catalyzed Intermolecular Reactions of α-Alkyl-α-Diazo Carbonyl Compounds with Selectivity over β-Hydride Migration. Acc Chem Res 2016; 49:115-27. [PMID: 26689221 DOI: 10.1021/acs.accounts.5b00425] [Citation(s) in RCA: 126] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Rh-carbenes derived from α-diazocarbonyl compounds have found broad utility across a remarkable range of reactivity, including cyclopropanation, cyclopropenation, C-H insertions, heteroatom-hydrogen insertions, and ylide forming reactions. However, in contrast to α-aryl or α-vinyl-α-diazocarbonyl compounds, the utility of α-alkyl-α-diazocarbonyl compounds had been moderated by the propensity of such compounds to undergo intramolecular β-hydride migration to give alkene products. Especially challenging had been intermolecular reactions involving α-alkyl-α-diazocarbonyl compounds. This Account discusses the historical context and prior limitations of Rh-catalyzed reactions involving α-alkyl-α-diazocarbonyl compounds. Early studies demonstrated that ligand and temperature effects could influence chemoselectivity over β-hydride migration. However, effects were modest and conflicting conclusions had been drawn about the influence of sterically demanding ligands on β-hydride migration. More recent advances have led to a more detailed understanding of the reaction conditions that can promote intermolecular reactivity in preference to β-hydride migration. In particular, the use of bulky carboxylate ligands and low reaction temperatures have been key to enabling intermolecular cyclopropenation, cyclopropanation, carbonyl ylide formation/dipolar cycloaddition, indole C-H functionalization, and intramolecular bicyclobutanation with high chemoselectivity over β-hydride migration. Cyclic α-diazocarbonyl compounds have been shown to be particularly resilient toward β-hydride migration and are the first class of compounds that can engage in intermolecular reactivity in the presence of tertiary β-hydrogens. DFT calculations were used to propose that for cyclic α-diazocarbonyl compounds, ring constraints relieve steric interaction for intermolecular reactions and thereby accelerate the rate of intermolecular reactivity relative to intramolecular β-hydride migration. Enantioselective reactions of α-alkyl-α-diazocarbonyl compounds have been developed using bimetallic N-imido-tert-leucinate-derived complexes. The most effective complexes were found by computation and X-ray crystallography to adopt a "chiral crown" conformation in which all of the imido groups are presented on one face of the paddlewheel complex in a chiral arrangement. Insight from computational studies guided the design and synthesis of a mixed ligand paddlewheel complex, Rh2(S-PTTL)3TPA, the structure of which bears similarity to the chiral crown complex Rh2(S-PTTL)4. Rh2(S-PTTL)3TPA engages substrate classes (aliphatic alkynes, silylacetylenes, α-olefins) that are especially challenging in intermolecular reactions of α-alkyl-α-diazoesters and catalyzes enantioselective cyclopropanation, cyclopropenation, and indole C-H functionalization with yields and enantioselectivities that are comparable or superior to Rh2(S-PTTL)4. The work detailed in this Account describes progress toward enabling a more general utility for α-alkyl-α-diazo compounds in Rh-catalyzed carbene reactions. Further studies on ligand design and synthesis will continue to broaden the scope of their selective reactions.
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Affiliation(s)
- Andrew DeAngelis
- DuPont
Crop Protection, Stine-Haskell Research Center, Newark, Delaware 19711, United States
| | - Robert Panish
- Brown
Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Joseph M. Fox
- Brown
Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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57
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Wu YN, Xu T, Fu R, Wang NN, Hao WJ, Wang SL, Li G, Tu SJ, Jiang B. Dual rhodium/copper catalysis: synthesis of benzo[b]fluorenes and 2-naphthalenylmethanones via de-diazotized cycloadditions. Chem Commun (Camb) 2016; 52:11943-11946. [DOI: 10.1039/c6cc06320a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel synergistic rhodium/copper catalysis has been established, enabling de-diazotized cycloadditions toward the selective formation of benzo[b]fluorenes and 2-naphthalenylmethanones.
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Affiliation(s)
- Ya-Nan Wu
- School of Chemistry and Chemical Engineering
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Ting Xu
- School of Chemistry and Chemical Engineering
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Rong Fu
- School of Chemistry and Chemical Engineering
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Nan-Nan Wang
- School of Chemistry and Chemical Engineering
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Wen-Juan Hao
- School of Chemistry and Chemical Engineering
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Shu-Liang Wang
- School of Chemistry and Chemical Engineering
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Guigen Li
- Department of Chemistry and Biochemistry
- Texas Tech University
- Lubbock
- USA
- Institute of Chemistry & BioMedical Sciences
| | - Shu-Jiang Tu
- School of Chemistry and Chemical Engineering
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Bo Jiang
- School of Chemistry and Chemical Engineering
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
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58
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Xu H, Zhou B, Zhou P, Zhou J, Shen Y, Yu FC, Lu LL. Insights into the unexpected chemoselectivity in Brønsted acid catalyzed cyclization of isatins with enaminones: convenient synthesis of pyrrolo[3,4-c]quinolin-1-ones and spirooxindoles. Chem Commun (Camb) 2016; 52:8002-5. [DOI: 10.1039/c6cc02659a] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Chemoselective [1+2+3] vs. cascade cyclization has been developed by switching Brønsted acid, offering a divergent synthesis of pyrrolo[3,4-c]quinolin-1-ones and spirooxindoles.
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Affiliation(s)
- Hui Xu
- Faculty of Life Science and Technology
- Kunming University of Science and Technology
- Kunming
- P. R. China
| | - Bei Zhou
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education
- School of Chemical Science and Technology
- Yunnan University
- Kunming
| | - Pan Zhou
- Faculty of Life Science and Technology
- Kunming University of Science and Technology
- Kunming
- P. R. China
| | - Jie Zhou
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education
- School of Chemical Science and Technology
- Yunnan University
- Kunming
| | - Yuehai Shen
- Faculty of Life Science and Technology
- Kunming University of Science and Technology
- Kunming
- P. R. China
| | - Fu-Chao Yu
- Faculty of Life Science and Technology
- Kunming University of Science and Technology
- Kunming
- P. R. China
| | - Ling-Ling Lu
- Faculty of Life Science and Technology
- Kunming University of Science and Technology
- Kunming
- P. R. China
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59
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Mills IN, Kagalwala HN, Bernhard S. Cyano-decorated ligands: a powerful alternative to fluorination for tuning the photochemical properties of cyclometalated Ir(iii) complexes. Dalton Trans 2016; 45:10411-9. [DOI: 10.1039/c6dt01516f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Two bis-cyclometalated Ir(iii) photocatalysts were synthesized with nitrile moieties which imparted remarkable photophysical properties over conventional fluorinated ligands.
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Affiliation(s)
- Isaac N. Mills
- Carnegie Mellon University
- Department of Chemistry
- Pittsburgh
- USA
| | | | - Stefan Bernhard
- Carnegie Mellon University
- Department of Chemistry
- Pittsburgh
- USA
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60
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Li H, Ma X, Lei M. Substituent effects and chemoselectivity of the intramolecular Buchner reaction of diazoacetamide derivatives catalyzed by the di-Rh(ii)-complex. Dalton Trans 2016; 45:8506-12. [DOI: 10.1039/c6dt00268d] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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61
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Zheng Y, Mao J, Weng Y, Zhang X, Xu X. Cyclopentadiene Construction via Rh-Catalyzed Carbene/Alkyne Metathesis Terminated with Intramolecular Formal [3 + 2] Cycloaddition. Org Lett 2015; 17:5638-41. [PMID: 26550688 DOI: 10.1021/acs.orglett.5b02912] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new type of intramolecular carbene cascade reaction of alkynyl-tethered styryl diazoesters is presented, which is terminated with a formal [3 + 2] cycloaddition to give the bicyclic cyclopentadiene derivatives in high yields and selectivity. Additionally, it was found that the β-H shift is the dominating process in the case of alkyl alkyne-tethered substrates.
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Affiliation(s)
- Yang Zheng
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
| | - Jincheng Mao
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University , Chengdu 610500, P. R. China
| | - Yuecheng Weng
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
| | - Xiaolu Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
| | - Xinfang Xu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China
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62
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Worch JC, Hellemann E, Pros G, Gayathri C, Pintauer T, Gil RR, Noonan KJT. Stability and Reactivity of 1,3-Benzothiaphosphole: Metalation and Diels–Alder Chemistry. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00583] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joshua C. Worch
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Erich Hellemann
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Gabrielle Pros
- Department
of Chemistry and Biochemistry, Duquesne University, 600 Forbes
Avenue, Pittsburgh, Pennsylvania 15282, United States
| | - Chakicherla Gayathri
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Tomislav Pintauer
- Department
of Chemistry and Biochemistry, Duquesne University, 600 Forbes
Avenue, Pittsburgh, Pennsylvania 15282, United States
| | - Roberto R. Gil
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Kevin J. T. Noonan
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
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63
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Panish R, Selvaraj R, Fox JM. Rh(II)-Catalyzed Reactions of Diazoesters with Organozinc Reagents. Org Lett 2015; 17:3978-81. [PMID: 26241081 DOI: 10.1021/acs.orglett.5b01836] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Rh(II)-catalyzed reactions of diazoesters with organozinc reagents are described. Diorganozinc reagents participate in reactions with diazo compounds by two distinct, catalyst-dependent mechanisms. With bulky diisopropylethyl acetate ligands, the reaction mechanism is proposed to involve initial formation of a Rh-carbene and subsequent carbozincation to give a zinc enolate. With Rh2(OAc)4, it is proposed that initial formation of an azine precedes 1,2-addition by an organozinc reagent. This straightforward route to the hydrazone products provides a useful method for preparing chiral quaternary α-aminoesters or pyrazoles via the Paul-Knorr condensation with 1,3-diketones. Crossover and deuterium labeling experiments provide evidence for the mechanisms proposed.
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Affiliation(s)
- Robert Panish
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Ramajeyam Selvaraj
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Joseph M Fox
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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64
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Tang Y, Chen Q, Liu X, Wang G, Lin L, Feng X. Direct Synthesis of Chiral Allenoates from the Asymmetric CH Insertion of α-Diazoesters into Terminal Alkynes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201501918] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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65
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Tang Y, Chen Q, Liu X, Wang G, Lin L, Feng X. Direct Synthesis of Chiral Allenoates from the Asymmetric CH Insertion of α-Diazoesters into Terminal Alkynes. Angew Chem Int Ed Engl 2015; 54:9512-6. [DOI: 10.1002/anie.201501918] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Revised: 04/30/2015] [Indexed: 11/11/2022]
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66
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Li L, Chen JJ, Kan XL, Zhang L, Zhao YL, Liu Q. One-Pot Synthesis of Phenanthridinones by Using a Base-Catalyzed/Promoted Bicyclization of α,β-Unsaturated Carbonyl Compounds with Dimethyl Glutaconate. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500414] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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67
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Divergent pathways of β,γ-unsaturated α-diazocarbonyl compounds catalyzed by dirhodium and Lewis acids catalysts separately or in combination. CHINESE CHEM LETT 2015. [DOI: 10.1016/j.cclet.2014.12.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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68
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Liu Z, Tan H, Wang L, Fu T, Xia Y, Zhang Y, Wang J. Transition-Metal-Free Intramolecular Carbene Aromatic Substitution/Büchner Reaction: Synthesis of Fluorenes and [6,5,7]Benzo-fused Rings. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201409982] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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69
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Liu Z, Tan H, Wang L, Fu T, Xia Y, Zhang Y, Wang J. Transition-metal-free intramolecular carbene aromatic substitution/Büchner reaction: synthesis of fluorenes and [6,5,7]benzo-fused rings. Angew Chem Int Ed Engl 2015; 54:3056-60. [PMID: 25604191 DOI: 10.1002/anie.201409982] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2014] [Revised: 11/20/2014] [Indexed: 11/06/2022]
Abstract
Intramolecular aromatic substitution and Büchner reaction have been established as powerful methods for the construction of polycyclic compounds. These reactions are traditionally catalyzed by Rh(II) catalysts with α-diazocarbonyl compounds as the substrates. Herein a transition-metal-free intramolecular aromatic substitution/Büchner reaction is presented. These reactions use readily available N-tosylhydrazones as the diazo compound precursors and show wide substrate scope.
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Affiliation(s)
- Zhenxing Liu
- Beijing National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871 (China)
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70
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Ma Z, Wang X, Wang X, Rodriguez RA, Moore CE, Gao S, Tan X, Ma Y, Rheingold AL, Baran PS, Chen C. Asymmetric syntheses of sceptrin and massadine and evidence for biosynthetic enantiodivergence. Science 2014; 346:219-24. [PMID: 25301624 DOI: 10.1126/science.1255677] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Cycloaddition is an essential tool in chemical synthesis. Instead of using light or heat as a driving force, marine sponges promote cycloaddition with a more versatile but poorly understood mechanism in producing pyrrole-imidazole alkaloids sceptrin, massadine, and ageliferin. Through de novo synthesis of sceptrin and massadine, we show that sponges may use single-electron oxidation as a central mechanism to promote three different types of cycloaddition. Additionally, we provide surprising evidence that, in contrast to previous reports, sceptrin, massadine, and ageliferin have mismatched chirality. Therefore, massadine cannot be an oxidative rearrangement product of sceptrin or ageliferin, as is commonly believed. Taken together, our results demonstrate unconventional chemical approaches to achieving cycloaddition reactions in synthesis and uncover enantiodivergence as a new biosynthetic paradigm for natural products.
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Affiliation(s)
- Zhiqiang Ma
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Xiaolei Wang
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Xiao Wang
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Rodrigo A Rodriguez
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Curtis E Moore
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA
| | - Shuanhu Gao
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Xianghui Tan
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Yuyong Ma
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Arnold L Rheingold
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA
| | - Phil S Baran
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Chuo Chen
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
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71
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Gong J, Zhao Z, Zhang F, Wu S, Yan G, Quan Y, Ma B. One-Pot Novel Regioselective Cycloisomerization Synthesis of 2-Substituted or 3-Substituted 4H-Furo[3,2-c]chromene through the Intermediate Cyclopropenes of 3-Diazochroman-4-one and Phenylacetylene. Org Lett 2014; 16:5524-7. [DOI: 10.1021/ol502854y] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jin Gong
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Zhensheng Zhao
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Fuming Zhang
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Songyun Wu
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Guangqi Yan
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Yingjie Quan
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Baochun Ma
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, China
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72
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Xu HD, Xu K, Jia ZH, Zhou H, Jiang P, Lu XL, Pan YP, Wu H, Ding Y, Shen MH, Pan XH. Substituent Enabled Divergent Synthesis of N-Heterocycles: a Metal Carbene Approach Involving Intramolecular Carbene Interception. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201402151] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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73
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Usui K, Tanoue K, Yamamoto K, Shimizu T, Suemune H. Synthesis of substituted azulenes via Pt(II)-catalyzed ring-expanding cycloisomerization. Org Lett 2014; 16:4662-5. [PMID: 25157475 DOI: 10.1021/ol502270q] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Substituted azulenes, valuable structures for electronic devices and pharmaceuticals, have been synthesized by the platinum(II)-catalyzed intramolecular ring-expanding cycloisomerization of 1-en-3-yne with ortho-disubstituted benzene. This novel method provides an alternative route for the efficient synthesis of substituted azulenes. The reaction mechanism of selected catalytic transformations was explored using density functional calculations.
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Affiliation(s)
- Kazuteru Usui
- Graduate School of Pharmaceutical Sciences, Kyushu University , 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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74
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Schultz EE, Lindsay VNG, Sarpong R. Expedient Synthesis of Fused Azepine Derivatives Using a Sequential Rhodium(II)-Catalyzed Cyclopropanation/1-Aza-Cope Rearrangement of Dienyltriazoles. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405356] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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75
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Schultz EE, Lindsay VNG, Sarpong R. Expedient synthesis of fused azepine derivatives using a sequential rhodium(II)-catalyzed cyclopropanation/1-aza-Cope rearrangement of dienyltriazoles. Angew Chem Int Ed Engl 2014; 53:9904-8. [PMID: 25044869 DOI: 10.1002/anie.201405356] [Citation(s) in RCA: 116] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Indexed: 11/11/2022]
Abstract
A general method for the formation of fused dihydroazepine derivatives from 1-sulfonyl-1,2,3-triazoles bearing a tethered diene is reported. The process involves an intramolecular cyclopropanation of an α-imino rhodium(II) carbenoid, leading to a transient 1-imino-2-vinylcyclopropane intermediate which rapidly undergoes a 1-aza-Cope rearrangement to generate fused dihydroazepine derivatives in moderate to excellent yields. The reaction proceeds with similar efficiency on gram scale. The use of catalyst-free conditions leads to the formation of a novel [4.4.0] bicyclic heterocycle.
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Affiliation(s)
- Erica E Schultz
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 (USA)
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76
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Abedi Y, Biffis A, Gava R, Tubaro C, Chelucci G, Stoccoro S. Cu-iminopyridine complexes as catalysts for carbene and nitrene transfer reactions. Appl Organomet Chem 2014. [DOI: 10.1002/aoc.3155] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yaghoub Abedi
- Dipartimento di Scienze Chimiche; Università di Padova; 35131 Padua Italy
| | - Andrea Biffis
- Dipartimento di Scienze Chimiche; Università di Padova; 35131 Padua Italy
| | - Riccardo Gava
- Dipartimento di Scienze Chimiche; Università di Padova; 35131 Padua Italy
| | - Cristina Tubaro
- Dipartimento di Scienze Chimiche; Università di Padova; 35131 Padua Italy
| | - Giorgio Chelucci
- Dipartimento di Agraria; Università di Sassari; 07100 Sassari Italy
| | - Sergio Stoccoro
- Dipartimento di Chimica e Farmacia; Università di Sassari; 07100 Sassari Italy
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77
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Miura T, Funakoshi Y, Murakami M. Intramolecular dearomatizing [3 + 2] annulation of α-imino carbenoids with aryl rings furnishing 3,4-fused indole skeletons. J Am Chem Soc 2014; 136:2272-5. [PMID: 24437578 DOI: 10.1021/ja412663a] [Citation(s) in RCA: 198] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The rhodium-catalyzed dearomatizing [3 + 2] annulation reaction of 4-(3-arylpropyl)-1,2,3-triazoles is described. It provides a straightforward synthetic pathway from simple 5-aryl-1-alkynes leading to tricyclic 3,4-fused dihydroindoles via the corresponding 1,2,3-triazoles.
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Affiliation(s)
- Tomoya Miura
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University , Katsura, Kyoto 615-8510, Japan
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78
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Cai Y, Lyu H, Yu C, Miao Z. Unexpected Stereoselective Synthesis of (Z)-β-Alkenyl Substituted β-Amino Phosphonates through β,γ-Dihydrogen Shift Reaction Catalyzed by a Copper(I) Complex and Iodine [Cu(MeCN)4]PF6/I2. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201300838] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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79
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González MJ, López E, Vicente R. Rhodium-catalyzed carbene transfer to alkynes via 2-furylcarbenes generated from enynones. Chem Commun (Camb) 2014; 50:5379-81. [DOI: 10.1039/c3cc47481j] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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80
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Nösel P, dos Santos Comprido LN, Lauterbach T, Rudolph M, Rominger F, Hashmi ASK. 1,6-Carbene transfer: gold-catalyzed oxidative diyne cyclizations. J Am Chem Soc 2013; 135:15662-6. [PMID: 24050384 DOI: 10.1021/ja4085385] [Citation(s) in RCA: 151] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
In the presence of a gold catalyst an unprecedented oxidative cyclization of diynes takes place. The reaction cascade is initiated by an oxygen transfer from a N-oxide onto a gold-activated alkyne. The formed α-oxo carbene is transferred across the second alkyne yielding a stabilized vinyl carbene/cation. Alkyl migration or sp(3)-CH insertion then terminates the catalytic cycle by formation of highly substituted functionalized indenones. A 1,6-carbene shift could be supported by the oxidation of the vinyl carbene. This protocol represents an attractive alternative to procedures which are based on the metal-catalyzed decomposition of hazardous, not easily accessible, diazo compounds.
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Affiliation(s)
- Pascal Nösel
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 270, 69221 Heidelberg, Germany
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81
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Lauterbach T, Gatzweiler S, Nösel P, Rudolph M, Rominger F, Hashmi ASK. Carbene Transfer - A New Pathway for Propargylic Esters in Gold Catalysis. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300572] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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82
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Xu X, Zavalij PY, Doyle MP. Catalytic Asymmetric Syntheses of Quinolizidines by Dirhodium-Catalyzed Dearomatization of Isoquinolinium/Pyridinium Methylides–The Role of Catalyst and Carbene Source. J Am Chem Soc 2013; 135:12439-47. [DOI: 10.1021/ja406482q] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Xichen Xu
- Department
of Chemistry and Biochemistry, University of Maryland, College Park, 20742, United
States
| | - Peter Y. Zavalij
- Department
of Chemistry and Biochemistry, University of Maryland, College Park, 20742, United
States
| | - Michael P. Doyle
- Department
of Chemistry and Biochemistry, University of Maryland, College Park, 20742, United
States
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83
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Hashimoto Y, Itoh K, Kakehi A, Shiro M, Suga H. Diastereoselective Synthesis of Tetrahydrofurans by Lewis Acid Catalyzed Intermolecular Carbenoid–Carbonyl Reaction–Cycloaddition Sequences: Unusual Diastereoselectivity of Lewis Acid Catalyzed Cycloadditions. J Org Chem 2013; 78:6182-95. [DOI: 10.1021/jo400858u] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Yuta Hashimoto
- Department of Chemistry and Material Engineering, Faculty
of Engineering, Shinshu University, Wakasato,
Nagano 380-8553, Japan and
| | - Kennosuke Itoh
- Department of Chemistry and Material Engineering, Faculty
of Engineering, Shinshu University, Wakasato,
Nagano 380-8553, Japan and
| | - Akikazu Kakehi
- Department of Chemistry and Material Engineering, Faculty
of Engineering, Shinshu University, Wakasato,
Nagano 380-8553, Japan and
| | - Motoo Shiro
- Rigaku Corporation, 3-9-12 Matsubaracho,
Akishima, Tokyo 196-8666, Japan
| | - Hiroyuki Suga
- Department of Chemistry and Material Engineering, Faculty
of Engineering, Shinshu University, Wakasato,
Nagano 380-8553, Japan and
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84
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Panish R, Chintala SR, Boruta DT, Fang Y, Taylor MT, Fox JM. Enantioselective synthesis of cyclobutanes via sequential Rh-catalyzed bicyclobutanation/Cu-catalyzed homoconjugate addition. J Am Chem Soc 2013; 135:9283-6. [PMID: 23758288 DOI: 10.1021/ja403811t] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Enantiomerically enriched cyclobutanes are constructed by a three-component process in which t-butyl (E)-2-diazo-5-arylpent-4-enoates are treated with Rh2(S-NTTL)4 to provide enantiomerically enriched bicyclobutanes, which can subsequently engage in homoconjugate addition/enolate trapping sequence to give densely functionalized cyclobutanes with high diastereoselectivity. This three-component, two-catalyst procedure can be carried out in a single flask. Rh2(S-NTTL)4-catalyzed reaction of t-butyl (Z)-2-diazo-5-phenylpent-4-enoate gives the Büchner cyclization product in excellent enantioselectivity.
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Affiliation(s)
- Robert Panish
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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85
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Nani RR, Reisman SE. α-Diazo-β-ketonitriles: Uniquely Reactive Substrates for Arene and Alkene Cyclopropanation. J Am Chem Soc 2013; 135:7304-11. [DOI: 10.1021/ja401610p] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Roger R. Nani
- The Warren and Katharine Schlinger
Laboratory for Chemistry
and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California
91125, United States
| | - Sarah E. Reisman
- The Warren and Katharine Schlinger
Laboratory for Chemistry
and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California
91125, United States
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86
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Schultz EE, Sarpong R. Application of In Situ-Generated Rh-Bound Trimethylenemethane Variants to the Synthesis of 3,4-Fused Pyrroles. J Am Chem Soc 2013; 135:4696-9. [DOI: 10.1021/ja401380d] [Citation(s) in RCA: 182] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Erica E. Schultz
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Richmond Sarpong
- Department of Chemistry, University of California, Berkeley, California 94720, United States
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87
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Yang L, Li J, Chai H, Lu H, Zhang Q, Shi D. A Divergent Synthesis of 1,8-Naphthyridines and Hydropyridopyrimidinones by the Reactions ofo-Aminonitriles with Ketones. CHINESE J CHEM 2013. [DOI: 10.1002/cjoc.201201247] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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88
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Trost BM, Malhotra S, Ellerbrock P. Exploring the Unique Reactivity of Diazoesters: An Efficient Approach to Chiral β-Amino Acids. Org Lett 2013; 15:440-3. [DOI: 10.1021/ol303011f] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Barry M. Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Sushant Malhotra
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Pascal Ellerbrock
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
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89
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Cai Y, Lu Y, Yu C, Lyu H, Miao Z. Combined C–H functionalization/O–H insertion reaction to form tertiary β-alkoxy substituted β-aminophosphonates catalyzed by [Cu(MeCN)4]PF6. Org Biomol Chem 2013; 11:5491-9. [DOI: 10.1039/c3ob40941d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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90
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Jiang H, Jin H, Abdukader A, Lin A, Cheng Y, Zhu C. Catalyst-controlled switchable phosphination of α-diazoesters. Org Biomol Chem 2013; 11:3612-5. [DOI: 10.1039/c3ob40429c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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91
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Owens CP, Varela-Álvarez A, Boyarskikh V, Musaev DG, Davies HML, Blakey SB. Iridium(iii)-bis(oxazolinyl)phenyl catalysts for enantioselective C–H functionalization. Chem Sci 2013. [DOI: 10.1039/c3sc50886b] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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92
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Li W, Li Y, Zhou G, Wu X, Zhang J. Gold(I)-Catalyzed Regiodivergent Rearrangements: 1,2- and 1,2′-Alkyl Migration in Skipped Alkynyl Ketones. Chemistry 2012; 18:15113-21. [DOI: 10.1002/chem.201201727] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Indexed: 11/06/2022]
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93
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94
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Mahatthananchai J, Dumas AM, Bode JW. Catalytic Selective Synthesis. Angew Chem Int Ed Engl 2012; 51:10954-90. [DOI: 10.1002/anie.201201787] [Citation(s) in RCA: 355] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Indexed: 11/08/2022]
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95
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Jiang B, Yi M, Tu M, Wang S, Tu S. Brønsted Acid‐Promoted Divergent Reactions of Enaminones: Efficient Synthesis of Fused Pyrroles with Different Substitution Patterns. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200280] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Bo Jiang
- School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China, Fax: (+86)‐516‐8350‐0065; phone: (+86)‐516‐8350‐0065
| | - Mian‐Shuai Yi
- School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China, Fax: (+86)‐516‐8350‐0065; phone: (+86)‐516‐8350‐0065
| | - Man‐Su Tu
- School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China, Fax: (+86)‐516‐8350‐0065; phone: (+86)‐516‐8350‐0065
| | - Shu‐Liang Wang
- School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China, Fax: (+86)‐516‐8350‐0065; phone: (+86)‐516‐8350‐0065
| | - Shu‐Jiang Tu
- School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China, Fax: (+86)‐516‐8350‐0065; phone: (+86)‐516‐8350‐0065
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96
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DeAngelis A, Dmitrenko O, Fox JM. Rh-catalyzed intermolecular reactions of cyclic α-diazocarbonyl compounds with selectivity over tertiary C-H bond migration. J Am Chem Soc 2012; 134:11035-43. [PMID: 22676258 PMCID: PMC3486930 DOI: 10.1021/ja3046712] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Intermolecular Rh-catalyzed reactions of cyclic α-diazocarbonyl compounds with chemoselectivity over β-hydride elimination are described. These methods represent the first general intermolecular reactions of Rh-carbenoids that are selective over tertiary β-C-H bond migration. Successful transformations include cyclopropanation, cyclopropenation, and various X-H insertion reactions with a broad scope of substrates. We propose that the intermolecular approach of substrates to carbenes from acyclic diazo precursors may be relatively slow due to a steric interaction with the ester function, which is perpendicular to the π-system of the carbene. For carbenes derived from five- and six-membered cyclic α-diazocarbonyls, it is proposed that the carbene is constrained to be more conjugated with the carbonyl, thereby relieving the steric interaction for intermolecular reactions, and accelerating the rate of intermolecular reactivity relative to intramolecular β-hydride migration. However, attempts to use α-diazo-β-ethylcaprolactone in intermolecular cyclopropanation with styrene were unsuccessful. It is proposed that the conformational flexibility of the seven-membered ring allows the carbonyl to be oriented perpendicular to Rh-carbene. The significant intermolecular interaction between the carbonyl and approaching substrate is in agreement with the poor ability of α-diazo-β-ethylcaprolactone to participate in intermolecular cyclopropanation reactions. DFT calculations provide support for the mechanistic proposals that are described.
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Affiliation(s)
- Andrew DeAngelis
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Olga Dmitrenko
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Joseph M. Fox
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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97
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Li Y, Xu X, Xia C, Pan L, Liu Q. Dithiolane-Directed Tandem Oxidation/1,2-Benzyl Migration of Tetramic Acids under Ambient Conditions. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200096] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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98
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Boruta DT, Dmitrenko O, Yap GPA, Fox JM. Rh(2)(S-PTTL)(3)TPA-A Mixed Ligand Dirhodium(II) Catalyst for Enantioselective Reactions of α-Alkyl-α-Diazoesters. Chem Sci 2012; 3:1589-1593. [PMID: 23125912 PMCID: PMC3486924 DOI: 10.1039/c2sc01134d] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Herein we report the synthesis of the mixed ligand paddlewheel complex dirhodium(II) tris[N-phthaloyl-(S)-tert-leucinate] triphenylacetate, Rh(2)(S-PTTL)(3)TPA, the structure of which bears similarity to the chiral crown complex Rh(2)(S-PTTL)(4). Rh(2)(S-PTTL)(3)TPA engages substrate classes (aliphatic alkynes, silylacetylenes, α-olefins) that are especially challenging in intermolecular reactions of α-alkyl-α-diazoesters, and catalyzes enantioselective cyclopropanation, cyclopropenation, and indole C-H functionalization with yields and enantioselectivities that are comparable or superior to Rh(2)(S-PTTL)(4). Mixing ligands on paddlewheel complexes offers a versatile handle for diversifying catalyst structure and reactivity. The results described herein illustrate how mixed ligand catalysts can create new opportunities for the optimization of catalytic asymmetric processes.
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Affiliation(s)
| | | | | | - Joseph M. Fox
- Brown Laboratory, Department of Chemistry and Biochemistry, Newark, DE 19803, USA. Fax: +1 302 831 8335; Tel: +1 302 831 0191
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99
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Swenson AK, Higgins KE, Brewer MG, Brennessel WW, Coleman MG. Highly selective synthesis of tetra-substituted furans and cyclopropenes: copper(i)-catalyzed formal cycloadditions of internal aryl alkynes and diazoacetates. Org Biomol Chem 2012; 10:7483-6. [DOI: 10.1039/c2ob26295a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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100
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Li Y, Xu X, Xia C, Zhang L, Pan L, Liu Q. Double nucleophilic attack on isocyanide carbon: a synthetic strategy for 7-aza-tetrahydroindoles. Chem Commun (Camb) 2012; 48:12228-30. [DOI: 10.1039/c2cc35896d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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