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De Marco R, Zhao J, Greco A, Ioannone S, Gentilucci L. In-Peptide Synthesis of Imidazolidin-2-one Scaffolds, Equippable with Proteinogenic or Taggable/Linkable Side Chains, General Promoters of Unusual Secondary Structures. J Org Chem 2019; 84:4992-5004. [DOI: 10.1021/acs.joc.8b03055] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Rossella De Marco
- Department of Chemistry “G. Ciamician”, University of Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Junwei Zhao
- Department of Chemistry “G. Ciamician”, University of Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Arianna Greco
- Department of Chemistry “G. Ciamician”, University of Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Simone Ioannone
- Department of Chemistry “G. Ciamician”, University of Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Luca Gentilucci
- Department of Chemistry “G. Ciamician”, University of Bologna, via Selmi 2, 40126 Bologna, Italy
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2
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Sarkar M, Daw P, Ghatak T, Bera JK. Amide-Functionalized Naphthyridines on a RhII-RhIIPlatform: Effect of Steric Crowding, Hemilability, and Hydrogen-Bonding Interactions on the Structural Diversity and Catalytic Activity of Dirhodium(II) Complexes. Chemistry 2014; 20:16537-49. [DOI: 10.1002/chem.201402936] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Indexed: 11/05/2022]
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3
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Adly FG, Ghanem A. Chiral Dirhodium(II) Carboxylates and Carboxamidates as Effective Chemzymes in Asymmetric Synthesis of Three-Membered Carbocycles. Chirality 2014; 26:692-711. [DOI: 10.1002/chir.22347] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 05/07/2014] [Indexed: 02/06/2023]
Affiliation(s)
- Frady G. Adly
- Chirality program, Faculty of ESTEM; University of Canberra; ACT Australia
| | - Ashraf Ghanem
- Chirality program, Faculty of ESTEM; University of Canberra; ACT Australia
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Barrios LA, Borilovic I, Salinas Uber J, Aguilà D, Roubeau O, Aromí G. A new type of paddle-wheel coordination complex. Dalton Trans 2013; 42:12185-92. [PMID: 23839807 DOI: 10.1039/c3dt51232k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the presence of Na(+) ions, the reaction of the ligand 2-hydroxy-1,3-bis-(3-oxo-3-(2-hydroxyphenyl)-propionyl)-benzene, H5L4, with M(AcO)2 salts (M = Mn, Co) gathers the conditions for the assembly of coordination complexes (NBu4)3[M2Na2(H2L4)3] (M = Mn(II) 1 and Co(II) 2), which exhibit a new paddle-wheel structure. The features of this new category of compounds are discussed as well as their magnetic properties and solution behaviour.
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Affiliation(s)
- Leoní A Barrios
- Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
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Mehra V, Singh P, Kumar V. β-Lactam-synthon-interceded diastereoselective synthesis of functionally enriched thioxo-imidazolidines, imidazolidin-2-ones, piperazine-5,6-diones and 4,5-dihydroimidazoles. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.08.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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6
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Selander N, Fokin VV. Rhodium(II)-catalyzed asymmetric sulfur(VI) reduction of diazo sulfonylamidines. J Am Chem Soc 2012; 134:2477-80. [PMID: 22233190 DOI: 10.1021/ja210180q] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Diazo sulfonylamidines readily undergo enantioselective oxygen transfer from sulfur to carbon atom in the presence of chiral rhodium(II) carboxylates resulting in chiral sulfinylamidines. This unusual asymmetric atom transfer "reduction" occurs rapidly under mild conditions, and sulfinylamidines are obtained in excellent yield.
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Affiliation(s)
- Nicklas Selander
- The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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Dunham SU, Remaley TS, Moore BS, Evans DL, Dunham SU. Isolation, Characterization, and DNA Binding Kinetics of Three Dirhodium(II,II) Carboxyamidate Complexes: Rh2(μ-L)(HNOCCF3)3 where L= [OOCCH3]−, [OOCCF3]−, or [HNOCCF3]−. Inorg Chem 2011; 50:3458-63. [DOI: 10.1021/ic1023532] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shari U Dunham
- Department of Chemistry, Moravian College, 1200 Main Street, Bethlehem, Pennsylvania 18018, USA.
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8
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Doyle MP, Ratnikov M, Liu Y. Intramolecular catalytic asymmetric carbon–hydrogen insertion reactions. Synthetic advantages in total synthesis in comparison with alternative approaches. Org Biomol Chem 2011; 9:4007-16. [DOI: 10.1039/c0ob00698j] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Slattery CN, Ford A, Maguire AR. Catalytic asymmetric C–H insertion reactions of α-diazocarbonyl compounds. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.05.073] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Doyle MP, Duffy R, Ratnikov M, Zhou L. Catalytic Carbene Insertion into C−H Bonds. Chem Rev 2009; 110:704-24. [DOI: 10.1021/cr900239n] [Citation(s) in RCA: 1392] [Impact Index Per Article: 92.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael P. Doyle
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Richard Duffy
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Maxim Ratnikov
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Lei Zhou
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
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11
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Nicolaou KC, Stepan AF, Lister T, Li A, Montero A, Tria GS, Turner CI, Tang Y, Wang J, Denton RM, Edmonds DJ. Design, synthesis, and biological evaluation of platensimycin analogues with varying degrees of molecular complexity. J Am Chem Soc 2008; 130:13110-9. [PMID: 18771264 PMCID: PMC2669665 DOI: 10.1021/ja8044376] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The molecular design, chemical synthesis, and biological evaluation of two distinct series of platensimycin analogues with varying degrees of complexity are described. The first series of compounds probes the biological importance of the benzoic acid subunit of the molecule, while the second series explores the tetracyclic cage domain. The biological data obtained reveal that, while the substituted benzoic acid domain of platensimycin is a highly conserved structural motif within the active compounds with strict functional group requirements, the cage domain of the molecule can tolerate considerable structural modifications without losing biological action. These findings refine our present understanding of the platensimycin pharmacophore and establish certain structure-activity relationships from which the next generation of designed analogues of this new antibiotic may emerge.
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
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12
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Nichols JM, Liu Y, Zavalij P, Isaacs L, Doyle MP. Diphenylglycoluril as a novel ligand architecture for dirhodium(II) carboxamidates. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2007.12.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
The design and use of chiral dirhodium(II) paddlewheel complexes as catalysts for asymmetric metal carbenoid and metal nitrenoid reactions, and as Lewis acids have become areas of considerable interest during the past two decades. The metal carbenoid chemistry is especially versatile, encompassing transformations such as C-H insertions, cyclopropanations and ylide formation. A number of different classes of dirhodium(II) catalysts have been found to be broadly effective in this chemistry. This review will highlight that many of these catalysts have higher symmetry than the individual chiral ligands themselves. An introduction of theoretical aspects concerning the structure and symmetry of chiral dirhodium(II) complexes will be given followed by an overview of the major classes of catalysts developed to date. Some representative examples of the synthetic potential of these catalysts will also be discussed.
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Affiliation(s)
- Jørn Hansen
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York, 14260-3000
| | - Huw M. L. Davies
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York, 14260-3000
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Angelici G, Contaldi S, Lynn Green S, Tomasini C. Synthesis of imidazolidin-2-one-4-carboxylate and of (tetrahydro)pyrimidin-2-one-5-carboxylate via an efficient modification of the Hofmann rearrangement. Org Biomol Chem 2008; 6:1849-52. [DOI: 10.1039/b801909f] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Schäffler L, Buck S, Maas G. 6-Halogenopyridin-2-olato complexes with the diruthenium(2+) core: Equilibria between head-to-head and head-to-tail structures. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2007.06.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Doyle MP, Ren T. The Influence of Ligands on Dirhodium(II) on Reactivity and Selectivity in Metal Carbene Reactions. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/9780470166512.ch2] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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Abstract
Dirhodium compounds are emerging as highly efficient catalysts for diverse reactions, and those with carboxamidate ligands have the broadest applications. The unique features of these compounds are their structural rigidity, ease of ligand exchange, open diaxial sites for coordination with Lewis bases, and their low oxidation potential. As consequences of this, dirhodium carboxamidates are efficient and effective catalysts for metal carbene reactions, Lewis acid-catalyzed processes, and chemical oxidations. With chiral carboxamidate ligands these dirhodium compounds show exceptional enantiocontrol for intramolecular cyclopropanation and carbon-hydrogen insertion reactions of diazoacetates, and they are also highly efficient and selective for hetero-Diels-Alder reactions. Their limitations lie in their moderate reactivities for metal carbene generation and Lewis acid catalysis and in the cost of the precious metal rhodium.
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Affiliation(s)
- Michael P Doyle
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
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18
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Doyle M, Weathers T, Wang Y. Stereoselectivity in Metal Carbene Addition to a Carbon-Carbon Triple Bond Tied to the Reactant Diazoacetate Through a Chiral Linker. Adv Synth Catal 2006. [DOI: 10.1002/adsc.200600349] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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Welch C, Tu Q, Wang T, Raab C, Wang P, Jia X, Bu X, Bykowski D, Hohenstaufen B, Doyle M. Observations of Rhodium-Containing Reaction Intermediates using HPLC with ICP-MS and ESI-MS Detection. Adv Synth Catal 2006. [DOI: 10.1002/adsc.200505438] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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20
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Weathers T, Doyle M, Carducci M. Substrateversus Catalyst Control of Stereoselectivity in the Cyclopropanation of a Carbon-Carbon Double Bond Linked to the Reactant Diazoacetate through a Chiral Linker. Adv Synth Catal 2006. [DOI: 10.1002/adsc.200505357] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Stereoselectivity in metal carbene and Lewis acid-catalyzed reactions from diastereomeric dirhodium(II) carboxamidates: Menthyl N-acetyl-2-oxoimidazolidine-4(S)-carboxylates. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2005.05.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Minami K, Saito H, Tsutsui H, Nambu H, Anada M, Hashimoto S. Highly Enantio- and Diastereoselective Construction of 1,2-Disubstituted Cyclopentane Compounds by Dirhodium(II) Tetrakis[N-phthaloyl-(S)-tert-leucinate]-Catalyzed CH Insertion Reactions of α-Diazo Esters. Adv Synth Catal 2005. [DOI: 10.1002/adsc.200505201] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Doyle MP, Morgan JP, Fettinger JC, Zavalij PY, Colyer JT, Timmons DJ, Carducci MD. “Matched/Mismatched” Diastereomeric Dirhodium(II) Carboxamidate Catalyst Pairs. Structure−Selectivity Correlations in Diazo Decomposition and Hetero-Diels−Alder Reactions. J Org Chem 2005; 70:5291-301. [PMID: 15960534 DOI: 10.1021/jo050609o] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Homo-ligated dirhodium(II) carboxamidates provide well-defined structural frameworks with which to investigate catalyst-controlled multiple asymmetric induction ("match/mismatch" effects). Diastereomeric pairs of methyl 2-oxoimidazolidine-4(S)-carboxylate ligands containing 2-phenylcyclopropane (4S,2'S,3'S-HMCPIM and 4S,2'R,3'R-HMCPIM) and N-benzenesulfonylproline (4S,2'S-HBSPIM and 4S,2'R-HBSPIM) attachments at the 1-N-acyl site have been prepared; the resulting (cis-2,2)-Rh(2)L(4) compounds have been produced in good yields, and the X-ray crystal structure of each dirhodium(II) compound has been obtained. The incorporation of additional stereocenters into the dirhodium(II) ligands leads to recognizable levels of double asymmetric induction for C-H insertion, cyclopropanation, and hetero-Diels-Alder cycloaddition applications. The configurationally "matched" cases provide modest increases in enantioselectivity for intramolecular C-H insertion reactions relative to the model catalyst Rh(2)(MPPIM)(4), but applications of the configurationally mismatched catalysts result in significant lowering of enantioselectivity. The Rh(2)(BSPIM)(4) catalysts show the highest degree of differential selectivity. Hetero-Diels-Alder reactions show inverse behavior from the configurationally matched and mismatched Rh(2)L(4) catalysts to that found in the metal carbene transformations.
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Affiliation(s)
- Michael P Doyle
- Department of Chemistry and Biochemistry, The University of Maryland, College Park, MD 20742, USA.
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Forslund R, Cain J, Colyer J, Doyle M. Chiral Dirhodium(II) Carboxamidate-Catalyzed [2+2]-Cycloaddition of TMS-Ketene and Ethyl Glyoxylate. Adv Synth Catal 2005. [DOI: 10.1002/adsc.200404245] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Doyle MP, Valenzuela M, Huang P. Asymmetric hetero-Diels-Alder reaction catalyzed by dirhodium(II) carboxamidates. Proc Natl Acad Sci U S A 2004; 101:5391-5. [PMID: 15060277 PMCID: PMC397391 DOI: 10.1073/pnas.0307025101] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2003] [Indexed: 11/18/2022] Open
Abstract
Chiral dirhodium(II) carboxamidates are highly efficient catalysts for reactions between a variety of aldehydes and activated dienes. Catalyst loadings as low at 0.01 mol % have been realized with enantioselectivities up to 97%. Kinetic investigations reveal a pronounced electronic influence on the rate of the hetero-Diels-Alder reaction with a Hammett rho value of +1.9 (versus sigma(+)). Inhibition of the catalyst by reactant aldehyde is apparent, but reactions show first-order dependence on aldehyde and diene, and there is a variable dependence on catalyst.
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Affiliation(s)
- Michael P Doyle
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.
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Doyle MP, Colyer JT. Synthesis of dirhodium(II) tetrakis[methyl 1-(3-phenylpropanoyl)-2-oxaimidazolidine-4(S)-carboxylate], Rh2(4S-MPPIM)4. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/j.tetasy.2003.08.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Davies HML, Beckwith REJ. Catalytic enantioselective C-H activation by means of metal-carbenoid-induced C-H insertion. Chem Rev 2003; 103:2861-904. [PMID: 12914484 DOI: 10.1021/cr0200217] [Citation(s) in RCA: 1325] [Impact Index Per Article: 63.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Huw M L Davies
- Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260-3000, USA
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Saha B, Uchida T, Katsuki T. Asymmetric intramolecular cyclopropanation of diazo compounds with metallosalen complexes as catalyst: structural tuning of salen ligand. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0957-4166(03)00167-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Steric balance within chiral dirhodium(II) carboxamidate catalysts enhances stereoselectivity. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1381-1169(02)00637-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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A short stereoselective synthesis of (+)- and (−)-2-oxabicyclo[3.3.0]oct-6-en-3-one by intramolecular carbon–hydrogen insertion catalyzed by chiral dirhodium(II) carboxamidates. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0957-4166(03)00083-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Tsutsui H, Yamaguchi Y, Kitagaki S, Nakamura S, Anada M, Hashimoto S. Dirhodium(II) tetrakis[N-tetrafluorophthaloyl-(S)-tert-leucinate]: an exceptionally effective Rh(II) catalyst for enantiotopically selective aromatic C–H insertions of diazo ketoesters. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0957-4166(03)00075-2] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Doyle MP, Hu W, Wee AGH, Wang Z, Duncan SC. Influences of catalyst configuration and catalyst loading on selectivities in reactions of diazoacetamides. Barrier to equilibrium between diastereomeric conformations. Org Lett 2003; 5:407-10. [PMID: 12583730 DOI: 10.1021/ol027157b] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] Stereoelectronic factors present a barrier to equilibrium between diastereomeric conformations resulting in differences in selectivity as a function of catalyst configuration. The bis(trimethylsilyl)-methyl protective group is inert to insertion but directs carbon-hydrogen insertion with enhanced enantiocontrol.
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Affiliation(s)
- Michael P Doyle
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA.
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Kadish KM, Wang LL, Thuriere A, Van Caemelbecke E, Bear JL. Factors affecting the electrochemical and spectroelectrochemical properties of diruthenium(III,II) complexes containing four identical unsymmetrical bridging ligands. Inorg Chem 2003; 42:834-43. [PMID: 12562197 DOI: 10.1021/ic020590x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Factors affecting the electrochemical and spectroelectrochemical properties of diruthenium(III,II) complexes containing four unsymmetrical bridging ligands are reported for seven related compounds which were isolated in one or two of the four possible isomeric forms. The investigated compounds are represented as Ru(2)(2-CH(3)ap)(4)Cl, Ru(2)(2,5-F(2)ap)(4)Cl, Ru(2)(2,6-F(2)ap)(4)Cl, and Ru(2)(2,4,6-F(3)ap)(4)Cl where 2-CH(3)ap, 2,5-F(2)ap, 2,6-F(2)ap, and 2,4,6-F(3)ap are, respectively, the 2-(2-methylanilino)pyridinate anion, the 2-(2,5-difluoroanilino)pyridinate anion, the 2-(2,6-difluoroanilino)pyridinate anion, and the 2-(2,4,6-trifluoroanilino)pyridinate anion. Ru(2)(2-CH(3)ap)(4)Cl and Ru(2)(2,5-F(2)ap)(4)Cl exist only in a (4,0) conformation while Ru(2)(2,4,6-F(3)ap)(4)Cl is present in both (3,1) and (4,0) isomeric forms. Ru(2)(2,6-F(2)ap)(4)Cl also exists in two isomeric forms, but only the (3,1) isomer was generated in sufficient quantities to be isolated and structurally characterized. This series of seven closely related metal-metal bonded complexes thus provides the first possibility to systematically examine how differences in position and number of the electron-donating or electron-withdrawing groups on the anionic bridging ligands might be related to the electronic properties and structural features of the compound as well as the type and number of geometric isomers which are formed. Each diruthenium derivative undergoes three one-electron transfers in CH(2)Cl(2) containing 0.1 M tetra-n-butylammonium perchlorate (TBAP). The first reduction and first oxidation products were characterized by thin-layer UV-vis spectroelectrochemistry, and the spectroscopic data, along with E(1/2) values, were then related via linear free energy relationships to the type of isomer and/or position of the electron-donating or electron-withdrawing substituents on the anionic ap bridge. The electrogenerated Ru(2)(6+) and Ru(2)(4+) forms of the compounds were assigned on the basis of electrochemical and UV-vis spectroscopic data as having the electronic configuration sigma(2)pi(4)delta(2)pi(2) and sigma(2)pi(4)delta(2)pi(3)delta, respectively, and seemed to be independent of the isomer type ((3,1) or (4,0)). The spectral and electrochemical properties of the compounds both vary substantially as a function of the isomer type, but this is not reflected in the structural features of the compounds which are within the range of what is seen for other Ru(2)(5+) species described in the literature. The Ru-Ru bond lengths of the four structurally characterized (4,0) isomers of the ap complexes range from 2.275 to 2.296 A while those of the three structurally characterized (3,1) isomers of ap derivatives fall in the range 2.284-2.286 A and show no significant difference among the three compounds. The Ru-Cl bond lengths of the (3,1) isomers do not vary significantly with the bridging ligand and range from 2.458 to 2.471 A whereas those of the (4,0) isomers range from 2.437 to 2.487 A and show larger variations among the compounds. The Ru-Ru-Cl bond angle is virtually independent of the bridging ligand in the case of the (4,0) isomers but decreases with the electron-withdrawing effect of the substituent in the case of the (3,1) isomers.
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Affiliation(s)
- Karl M Kadish
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA
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Doyle MP, Yan M. Chiral catalyst enhancement of diastereocontrol for OH insertion reactions of styryl- and phenyldiazoacetate esters of pantolactone. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01282-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Doyle MP, Hu W, Valenzuela MV. Total synthesis of (S)-(+)-imperanene. Effective use of regio- and enantioselective intramolecular carbon-hydrogen insertion reactions catalyzed by chiral dirhodium(II) carboxamidates. J Org Chem 2002; 67:2954-9. [PMID: 11975552 DOI: 10.1021/jo016220s] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The total synthesis of (S)-(+)-imperanene, a natural product found in Chinese medicine, has been completed in 12 steps from a commercially available cinnamic acid. The key step is highly enantioselective carbon-hydrogen insertion from a diazoacetate using a chiral dirhodium(II) carboxamidate catalyst. An elimination process essential to the construction has been optimized to avoid intramolecular Friedel-Crafts alkylation.
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Affiliation(s)
- Michael P Doyle
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA.
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Doyle MP, Timmons DJ, Tumonis JS, Gau HM, Blossey EC. Preparation and Catalytic Properties of Immobilized Chiral Dirhodium(II) Carboxamidates. Organometallics 2002. [DOI: 10.1021/om011082i] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael P. Doyle
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, and Department of Chemistry, Rollins College, Winter Park, Florida 32789
| | - Daren J. Timmons
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, and Department of Chemistry, Rollins College, Winter Park, Florida 32789
| | - Jennifer S. Tumonis
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, and Department of Chemistry, Rollins College, Winter Park, Florida 32789
| | - Han-Mou Gau
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, and Department of Chemistry, Rollins College, Winter Park, Florida 32789
| | - Erich C. Blossey
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, and Department of Chemistry, Rollins College, Winter Park, Florida 32789
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Wee AG. A dirhodium(II)-carbenoid route to (-)- and (+)-Geissman-Waiss lactone: synthesis of (1R,7R,8R)-(-)-turneforcidine. J Org Chem 2001; 66:8513-7. [PMID: 11735532 DOI: 10.1021/jo010753j] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
(-)- and (+)-Geissman-Waiss lactone, 4b, was efficiently prepared via the intramolecular C-H insertion reaction of the chiral nonracemic diazoacetates (-)-5a and (+)-5b catalyzed by dirhodium(II) tetrakis[methyl (5R and 5S)-3-phenylpropanoyl-2-imidazolidinone-5-carboxylate]. The cyclization was found to proceed with excellent regioselectivity and cis-diastereoselectivity. The bicyclic lactone (-)-4b was successfully used in the synthesis of the necine base, (-)-turneforcidine 2.
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Affiliation(s)
- A G Wee
- Department of Chemistry and Biochemistry, University of Regina, Regina, Saskatchewan, S4S 0A2, Canada.
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Doyle MP, Davies SB, May EJ. High selectivity from configurational match/mismatch in carbon-hydrogen insertion reactions of steroidal diazoacetates catalyzed by chiral dirhodium(II) carboxamidates. J Org Chem 2001; 66:8112-9. [PMID: 11722213 DOI: 10.1021/jo015932f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Diazo decomposition of steroidal diazoacetates, where the point of attachment is the 3-position of the steroid A-ring, catalyzed by chiral dirhodium(II) carboxamidates results in products from carbon-hydrogen insertion in high yield and selectivities. Use of S-configured catalysts shows a distinctive preference for insertion into the 3-position to form beta-lactone products. The R-configured catalysts direct insertion preferentially to the equatorial C-H bond at the 2-position. Substituents or functional groups at the 5/6-position prevent C-H insertion from taking place at the 4-position. Even in the best case with the 5/6-positions fully saturated, however, insertion into the 3-position remains competitive with insertion into the 4-position. Corresponding 3-substituted phenyldiazoacetates give only beta-lactone products, and selectivity here is highest with chiral dirhodium(II) prolinate catalysts. A model is presented to explain these results. Overall, this methodology is versatile for functionalization of the steroid A-ring at positions 2 and 3.
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Affiliation(s)
- M P Doyle
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA.
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Barberis M, Estevan F, Lahuerta P, Pérez-Prieto J, Sanaú M. New dinuclear catalysts Rh(2)(N-O)(2)[(C6H4)P(C6H5)2]2 with imidate ligands: synthesis and isomerization from head-to-tail to head-to-head configuration of the imidate ligands. Inorg Chem 2001; 40:4226-9. [PMID: 11487326 DOI: 10.1021/ic010257d] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Two new dirhodium(II) catalysts of general formula Rh(2)(N-O)(2)[(C(6)H(4))P(C(6)H(5))(2)](2) (N-O = C(4)H(4)NO(2)) are prepared, starting from Rh(2)(O(2)CCH(3))(2)(PC)(2)L(2) [PC = (C(6)H(4))P(C(6)H(5))(2) (head-to-tail arrangement); L = HO(2)CCH(3)]. The thermal reaction of Rh(2)(O(2)CCH(3))(2)(PC)(2).L(2) with the neutral succinimide stereoselectively gives one compound that according to the X-ray structure determination has the formula Rh(2)(C(4)H(4)NO(2))(2)[(C(6)H(4))P(C(6)H(5))(2)](2) (1). It corresponds to the polar isomer with two bridging imidate ligands in a head-to-head configuration. However, stepwise reaction of Rh(2)(O(2)CCH(3))(2)(PC)(2).L(2) with (CH(3))(3)SiCl and potassium succinimidate yields a mixture of 1 and one of the two possible isomers (structure B) with a head-to-tail configuration of the imidate ligands, Rh(2)(C(4)H(4)NO(2))(2)[(C(6)H(4))P(C(6)H(5))(2)](2) (2), also characterized by X-ray methods. In solution, compound 2 undergoes slow isomerization to 1; the rate of this process is enhanced by the presence of acetonitrile. Compounds 1 and 2 are obtained as pure enantiomers starting from (M)- and (P)-Rh(2)(O(2)CCH(3))(2)(PC)(2).L(2) rather than from the racemic mixture. Their enantioselectivities in cyclopropanation of 1-diazo-5-penten-2-one are similar to those reported for the dirhodium amidate catalysts.
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Affiliation(s)
- M Barberis
- Departamento de Química Inorgánica, Facultat de Química, Universitat de Valencia, Dr. Moliner, 50, 46100 Burjassot-Valencia, Spain
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Wee AG. A facile synthesis of (−)- and (+)-Geissman–Waiss lactone via intramolecular Rh(II)-carbenoid mediated C–H insertion reaction: synthesis of (1R,7R,8R)-turneforcidine. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01664-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Doyle MP, Hu W, Chapman B, Marnett AB, Peterson CS, Vitale JP, Stanley SA. Enantiocontrolled Macrocycle Formation by Catalytic Intramolecular Cyclopropanation. J Am Chem Soc 2000. [DOI: 10.1021/ja9945414] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael P. Doyle
- Contribution from the Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Wenhao Hu
- Contribution from the Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Brant Chapman
- Contribution from the Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Alan B. Marnett
- Contribution from the Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Chad S. Peterson
- Contribution from the Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Justin P. Vitale
- Contribution from the Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Sarah A. Stanley
- Contribution from the Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
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Eagle CT, Farrar DG, Holder GN, Pennington WT, Bailey RD. Structural and electronic properties of (2,2-trans)-dirhodium(II) tetrakis(N-phenylacetamidate). J Organomet Chem 2000. [DOI: 10.1016/s0022-328x(99)00556-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Doyle MP, Forbes DC. Recent Advances in Asymmetric Catalytic Metal Carbene Transformations. Chem Rev 1998; 98:911-936. [PMID: 11848918 DOI: 10.1021/cr940066a] [Citation(s) in RCA: 1071] [Impact Index Per Article: 41.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael P. Doyle
- Department of Chemistry, University of Arizona, Tucson, Arizona 85721
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Asymmetric carbene transformations. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s1874-5156(97)80011-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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(4,0)-Dirhodium(II) tetrakis[methyl 1-acetyl-2-oxoimidazolidine-4(S)-carboxylate]. Implications for the mechanism of ligand exchange reactions. Inorganica Chim Acta 1997. [DOI: 10.1016/s0020-1693(97)05525-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Enantiocontrol in intramolecular cyclopropanation of diazoketones. Conformational control of metal carbene alignment. Russ Chem Bull 1997. [DOI: 10.1007/bf02496127] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Bode JW, Doyle MP, Protopopova MN, Zhou QL. Intramolecular Regioselective Insertion into Unactivated Prochiral Carbon−Hydrogen Bonds with Diazoacetates of Primary Alcohols Catalyzed by Chiral Dirhodium(II) Carboxamidates. Highly Enantioselective Total Synthesis of Natural Lignan Lactones. J Org Chem 1996. [DOI: 10.1021/jo961607u] [Citation(s) in RCA: 116] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jeffrey W. Bode
- Department of Chemistry, Trinity University, San Antonio, Texas 78212
| | - Michael P. Doyle
- Department of Chemistry, Trinity University, San Antonio, Texas 78212
| | | | - Qi-Lin Zhou
- Department of Chemistry, Trinity University, San Antonio, Texas 78212
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