351
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Wolf C, Xu H. Efficient Synthesis of Sterically Crowded Biaryls by Palladium-Phosphinous Acid-Catalyzed Cross-Coupling of Aryl Halides and Aryl Grignards. J Org Chem 2007; 73:162-7. [DOI: 10.1021/jo701893m] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christian Wolf
- Department of Chemistry, Georgetown University, Washington, D.C. 20057
| | - Hanhui Xu
- Department of Chemistry, Georgetown University, Washington, D.C. 20057
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352
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353
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Kramer R, Brückner R. Asymmetric Hydrogenations One by One: Differentiation of up to Three β-Ketocarboxylic Acid Derivatives Based on Ruthenium(II)–Binap Catalysis. Chemistry 2007; 13:9076-86. [PMID: 17694528 DOI: 10.1002/chem.200700527] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Noyori-type reductions of pairs of beta-ketoamides and beta-ketoesters with elemental hydrogen (4 bar) proceeded substrate by substrate. When Et(2)NH(2) (+)[{RuCl(S)-binap}(2)](mu-Cl)(3)(-) was employed as a catalyst in a methanol or ethanol solution, the substrates were reduced at room temperature in the order beta-ketopyrrolidide > or = beta-ketopiperidide > or = beta-keto(N,N-diethylamide) > beta-keto(alkyl esters) > beta-keto(oligofluoroalkyl esters). This is the first time that beta-ketoamides have been reduced asymmetrically (91 to >98 % ee) under such mild conditions. Monitoring the concentrations of these beta-ketocarboxyl acid derivatives and their respective hydrogenation products over the course of time showed that the most electron-rich substrate is captured by the catalyst preferentially and exothermically; whether this occurs reversibly or irreversibly remains to be determined. The hydrogenation product is subsequently formed. The last transformation includes the rate-determining step. The combination of these events explains why starting from appropriate mixtures of substrates a "first-choice substrate" reacted from early on while the "second-choice substrate" stayed virtually untouched over an extended period of time and reacted no earlier than after the "first-choice substrate" had disappeared. From then onward, however, the "second-choice substrate" also reacted relatively rapidly.
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Affiliation(s)
- Rainer Kramer
- Institut für Organische Chemie und Biochemie, Universität Freiburg, Albertstrasse 21, 79104 Freiburg, Germany
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354
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Doherty S, Knight JG, Smyth CH, Harrington RW, Clegg W. Rhodium-Catalyzed Double [2 + 2 + 2] Cycloaddition of 1,4-Bis(diphenylphosphinoyl)buta-1,3-diyne with Tethered Diynes: A Modular, Highly Versatile Single-Pot Synthesis of NU-BIPHEP Biaryl Diphosphines. Org Lett 2007; 9:4925-8. [DOI: 10.1021/ol702390p] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simon Doherty
- School of Natural Sciences, Chemistry, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
| | - Julian G. Knight
- School of Natural Sciences, Chemistry, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
| | - Catherine H. Smyth
- School of Natural Sciences, Chemistry, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
| | - Ross W. Harrington
- School of Natural Sciences, Chemistry, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
| | - William Clegg
- School of Natural Sciences, Chemistry, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
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355
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Masson G, Housseman C, Zhu J. The enantioselective Morita-Baylis-Hillman reaction and its aza counterpart. Angew Chem Int Ed Engl 2007; 46:4614-28. [PMID: 17397122 DOI: 10.1002/anie.200604366] [Citation(s) in RCA: 427] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The development of asymmetric Morita-Baylis-Hillman (MBH) reactions has evolved dramatically over the past few years, parallel to the emerging concept of bifunctional organocatalysis. Whereas organocatalysis is starting to compete with metal-based catalysis in several important organic transformations, the MBH reaction belongs to a group of prototypical reactions in which organocatalysts already display superiority over their metal-based counterparts. This Minireview summarizes recent mechanistic insights and advances in the design and synthesis of small organic molecules for enantioselective MBH and aza-MBH reactions.
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Affiliation(s)
- Géraldine Masson
- Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France.
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356
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Wolf C, Xu H. Analysis of the stereodynamics of 2,2′-disubstituted biphenyls by dynamic chromatography. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.07.186] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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357
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Masson G, Housseman C, Zhu J. Enantioselektive Morita-Baylis-Hillman-Reaktionen und ihre Aza-Varianten. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200604366] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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358
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2,2′-Bis-[bis(4-substituted-phenyl)phosphino]-1,1′-binaphthyl derivatives in Rh(I)-catalyzed hydrogenation of acetamidoacrylic acid derivatives: Electronic effects. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2007.02.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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359
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Jahjah M, Jahjah R, Pellet-Rostaing S, Lemaire M. Asymmetric hydrogenation of aromatic ketones with new P-chirogenic monophosphine ligands. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.05.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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360
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Angell Y, Burgess K. Base Dependence in Copper-Catalyzed Huisgen Reactions: Efficient Formation of Bistriazoles. Angew Chem Int Ed Engl 2007; 46:3649-51. [PMID: 17410632 DOI: 10.1002/anie.200700399] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yu Angell
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, TX 77842-3012, USA
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361
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Angell Y, Burgess K. Base Dependence in Copper-Catalyzed Huisgen Reactions: Efficient Formation of Bistriazoles. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200700399] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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362
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Alame M, Jahjah M, Berthod M, Lemaire M, Meille V, de Bellefon C. New 5,5′-disubstituted BINAP derivatives: Syntheses and pressure and electronic effects in Rh asymmetric hydrogenation. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2006.12.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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363
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Horn J, Bannwarth W. Repetitive Application of a Fluorous Chiral BINAP–Ru Complex in the Asymmetric Hydrogenation of Olefins. European J Org Chem 2007. [DOI: 10.1002/ejoc.200601068] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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364
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Darcel C, Moulin D, Henry JC, Lagrelette M, Richard P, Harvey PD, Jugé S. Modular P-Chirogenic Aminophosphane-Phosphinite Ligands for Rh-Catalyzed Asymmetric Hydrogenation: A New Model for Prediction of Enantioselectivity. European J Org Chem 2007. [DOI: 10.1002/ejoc.200600966] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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365
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Tsubaki K, Takaishi K, Sue D, Kawabata T. Synthesis and Determination of the Absolute Configuration of Chiral Tetracosanaphthalenes. J Org Chem 2007; 72:4238-41. [PMID: 17447816 DOI: 10.1021/jo070343g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tetracosanaphthalenes with diethylaminocarbonylmethoxy side chains were constructed by bottom-up synthesis, and their absolute configurations were determined by an exciton chirality method.
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Affiliation(s)
- Kazunori Tsubaki
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
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366
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Saha B, RajanBabu TV. Syntheses and applications of 2-phosphino-2'-alkoxy-1,1'-binaphthyl ligands. Development of a working model for asymmetric induction in hydrovinylation reactions. J Org Chem 2007; 72:2357-63. [PMID: 17335230 DOI: 10.1021/jo062044h] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Among the handful of monophosphine ligands that effect asymmetric hydrovinylation of vinylarenes, 2-diphenylphosphino-2'-methoxy-1,1'-binaphthyl (MOP) is among the most accessible. Addition of a methyl group at the 3'-position of this ligand significantly improves the enantioselectivity of hydrovinylation of prototypical alkenes. Introduction of a chiral phospholane at the C2 position of this scaffolding has no effect on the enantioselectivity. These results are consistent with a model proposed for the asymmetric induction for this exacting reaction.
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Affiliation(s)
- Biswajit Saha
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA
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367
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Sgalla S, Fabrizi G, Cacchi S, Macone A, Bonamore A, Boffi A. Horseradish peroxidase in ionic liquids. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcatb.2006.10.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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368
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Chen G, Lam WH, Fok WS, Lee HW, Kwong FY. Easily Accessible Benzamide-Derived P,O Ligands (Bphos) for Palladium-Catalyzed Carbon–Nitrogen Bond-Forming Reactions. Chem Asian J 2007; 2:306-13. [PMID: 17441166 DOI: 10.1002/asia.200600322] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Easily accessible benzamide-derived hemilabile phosphine ligands were efficiently prepared through ortho-directed lithiation of the corresponding N,N-diethylbenzamide followed by quenching with chlorodialkylphosphines. These structurally simple hemilabile ligands were found to be highly effective in palladium-catalyzed amination of aryl and heteroaryl chlorides. Various sterically congested and functionalized aryl halide substrates were compatible in these reaction conditions. By using optimized reaction conditions, remarkable catalyst productivity (total turnover number up to 8400) was obtained.
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Affiliation(s)
- Guoshu Chen
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology, Shenzhen, China
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369
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Morris DJ, Docherty G, Woodward G, Wills M. Modification of ligand properties of phosphine ligands for C–C and C–N bond-forming reactions. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2006.12.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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370
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Electronic and Steric Effects in Diamine Recognition with a Highly Rigid Zn(II) Complex. B KOREAN CHEM SOC 2007. [DOI: 10.5012/bkcs.2007.28.1.133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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371
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Fleckenstein C, Roy S, Leuthäusser S, Plenio H. Sulfonated N-heterocyclic carbenes for Suzuki coupling in water. Chem Commun (Camb) 2007:2870-2. [PMID: 17609804 DOI: 10.1039/b703658b] [Citation(s) in RCA: 153] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sulfonated, water-soluble imidazolium and imidazolinium salts were synthesized and the respective Pd-complexes with N,N'-bis(2,6-dialkyl-4-SO(3)(-)-phenyl)imidazol-2-ylidene and N,N'-bis(2,6-dialkyl-4-SO(3)(-)-phenyl)-4,5-dihydroimidazol-2-ylidene ligands were applied in aqueous Suzuki coupling reactions of aryl chlorides.
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372
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Zi G, Xiang L, Zhang Y, Wang Q, Zhang Z. Synthesis, structure, and activity of (PhCH2NH2)2CuCl2 for oxidative coupling of 2-naphthylamine. Appl Organomet Chem 2007. [DOI: 10.1002/aoc.1197] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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373
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Pintér A, Haberhauer G, Hyla-Kryspin I, Grimme S. Configurationally stable propeller-like triarylphosphine and triarylphosphine oxide. Chem Commun (Camb) 2007:3711-3. [PMID: 17851603 DOI: 10.1039/b709655k] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Configurationally stable, propeller-like triarylphosphine and triarylphosphine oxide can be synthesized; a chiral scaffold based on Lissoclinum-cyclopeptides linked via three peptide bonds with a triphenylphosphine and triphenylphosphine oxide moiety, respectively, prevents effectively epimerization at the chiral phosphorus atom.
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Affiliation(s)
- Aron Pintér
- Institut für Organische Chemie, Fachbereich Chemie, Universität Duisburg-Essen, Universitätsstrasse 5, D-45117 Essen, Germany
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374
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Neumann B, Krinninger C, Lorenz IP. Synthesis, Structures and Comparison of Neutral Complexes Formed by2-(2′-Pyridyl)indole and d6 Transition Metals. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200600730] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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375
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Abstract
Helical oligonaphthalenes were constructed by bottom-up synthesis (repeating dimerization reactions), their absolute configurations were determined by an exciton chirality method and their functions, such as energy transfer, are also reported.
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Affiliation(s)
- Kazunori Tsubaki
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
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376
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Vignolle J, Donnadieu B, Bourissou D, Bertrand G. An unusual norcaradiene/tropylium rearrangement from a persistent amino-phosphonio-carbene. Tetrahedron Lett 2007; 48:685-687. [PMID: 19513183 DOI: 10.1016/j.tetlet.2006.11.099] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An amino-phosphonio-carbene featuring a bromobiphenyl backbone was prepared and spectroscopically characterized at low temperature. This carbene was found to readily rearrange upon warm up, affording an original tricyclic phospholium derivative, presumably via a norcaradiene/tropylium isomerization.
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Affiliation(s)
- Joan Vignolle
- Laboratoire Hétérochimie Fondamentale et Appliquée du CNRS (UMR 5069), Université Paul Sabatier, 118, route de Narbonne, 31062 Toulouse Cedex 9, France
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377
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Gorobets E, McDonald R, Keay BA. Diastereospecific intramolecular Ullmann couplings: unique chiral auxiliary for the preparation of 3,3'-disubstituted MeO-BIPHEP derivatives. Org Lett 2006; 8:1483-5. [PMID: 16562922 DOI: 10.1021/ol060484p] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] A chiral auxiliary is described that provides only one diastereomer during intramolecular Ullmann couplings. Treatment of five Ullmann coupling precursors with Cu powder in DMF at 115 degrees C provides 2,2',3,3',6,6'-hexasubstituted 1,1'-biphenyls as single diastereomers in yields ranging from 66% to 91%.
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Affiliation(s)
- E Gorobets
- Department of Chemistry, University of Calgary, Calgary, AB, Canada
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378
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Vignolle J, Donnadieu B, Bourissou D, Soleilhavoup M, Bertrand G. Cyclic C-amino phosphorus ylides as a source of bidentate heteroditopic ligands (phosphine/aminocarbene) for transition metals. J Am Chem Soc 2006; 128:14810-1. [PMID: 17105283 PMCID: PMC2440677 DOI: 10.1021/ja0662725] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In contrast with most of their congeners, acyclic and cyclic C-amino phosphorus ylides behave as genuine carbene and phosphine transfer agents for transition metal centers. They allow the facile synthesis of a variety of metal complexes that feature heteroditopic ligands, such as 1,6-(phosphine)(aminocarbene) systems with a biphenyl backbone.
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Affiliation(s)
- Joan Vignolle
- UCR-CNRS Joint Research Chemistry Laboratory (UMI 2957), Department of Chemistry, University of California-Riverside, Riverside, CA 92521-0403, USA
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379
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Mola J, Rodríguez M, Romero I, Llobet A, Parella T, Poater A, Duran M, Solà M, Benet-Buchholz J. New Ru Complexes Containing the N-Tridentate bpea and Phosphine Ligands: Consequences of Meridional vs Facial Geometry. Inorg Chem 2006; 45:10520-9. [PMID: 17173407 DOI: 10.1021/ic061126l] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis and isolation of the complex cis,fac-[RuIICl2(bpea)(PPh3)][3; bpea = N,N-bis(2-pyridylmethyl)ethylamine] and three geometrical isomers of the complex [RuIICl(bpea)(dppe)](BF4) [4; dppe = (1,2-diphenylphosphino)ethane], trans,fac (4a), cis,fac (4b), and mer(down) (4c), have been described (see Chart 1 for a drawing of their structures). These complexes have been characterized through analytical, spectroscopic (IR, UV/vis, and 1D and 2D NMR), and electrochemical (cyclic voltammetry) techniques. In addition, complexes 3, 4a, and 4b have been further characterized in the solid state through monocrystal X-ray diffraction analysis. The molecular and electronic structures of isomers 4a, 4b, 4c, and 4d (the mer(up) isomer) have also been studied by means of density functional theory (DFT) calculations. Furthermore, their low-energy electronic transitions have been simulated using time-dependent DFT approaches, which have allowed unraveling of their metal-to-ligand charge-transfer nature. Complexes 3 and 4a-c are capable of catalyzing H-transfer types of reactions between alcohols and aromatic ketones such as acetophenone and 2,2-dimethylpropiophenone (DP). A strong influence of the facial versus meridional geometry in the bpea ligand coordination mode is observed for these catalytic reactions, with the meridional isomer being much more active than the facial one. The meridional isomer is even capable of carrying out the H-transfer reaction of bulky substrates such as DP at room temperature.
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Affiliation(s)
- Joaquim Mola
- Departament de Química, Universitat de Girona, Campus de Montilivi, E-17071 Girona, Spain
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380
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Brandes S, Niess B, Bella M, Prieto A, Overgaard J, Jørgensen KA. Non-Biaryl Atropisomers in Organocatalysis. Chemistry 2006; 12:6039-52. [PMID: 16789058 DOI: 10.1002/chem.200600495] [Citation(s) in RCA: 194] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A new class of 6'-hydroxy cinchona alkaloids, with a non-biaryl atropisomeric functionalisation at position 5' of the quinoline core can be prepared by an easy amination procedure. These are the first derivatives for which the principle of atropisomerism is engrafted in the classical core of the cinchona alkaloids. The aminated cinchona alkaloids are effective organocatalysts for the Michael addition of beta-keto esters to acrolein and methyl vinyl ketone, in up to 93 % ee (ee=enantiomeric excess), as well as for the asymmetric Friedel-Crafts amination of a variety of 2-naphthols, permitting the preparation of the latter in up to 98 % ee. The aminated 8-amino-2-naphthol itself is the first chiral organocatalyst based on non-biaryl atropisomerism. The two enantiomers of this chiral primary amine can be used for the direct alpha-fluorination of alpha-branched aldehydes. The fluorinated compounds can thereby be accessed in up to 90 % ee.
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Affiliation(s)
- Sebastian Brandes
- The Danish National Research Foundation, Center for Catalysis, Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
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381
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Jäkel C, Paciello R. High-Throughput and Parallel Screening Methods in Asymmetric Hydrogenation. Chem Rev 2006; 106:2912-42. [PMID: 16836304 DOI: 10.1021/cr040675a] [Citation(s) in RCA: 201] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christoph Jäkel
- BASF Aktiengesellschaft, Basic Chemicals Research, GCB - M 313, 67098 Ludwigshafen, Germany
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382
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Yuan X, Zhang Z. Facile and Practical Synthesis of (R)‐6‐Br‐2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397910500503496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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383
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Song J, Cheng Y, Chen L, Zou X, Zhiliu W. Synthesis and characterization of polybinaphthalene incorporating chiral (R) or (S)-1,1′-binaphthalene and oxadiazole units by Heck reaction. Eur Polym J 2006. [DOI: 10.1016/j.eurpolymj.2005.08.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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384
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Dendritic BIPHEP: Synthesis and application in asymmetric hydrogenation of β-ketoesters. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2005.08.036] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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385
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Morrison DJ, Riegel SD, Piers WE, Parvez M, McDonald R. 2,2′-Disubstituted F12binaphthyl derivatives: stannanes, boranes, and (R)-F12BINOL. Chem Commun (Camb) 2006:2875-7. [PMID: 17007402 DOI: 10.1039/b605716k] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2,2'-Distannyl derivatives of dodecafluorobinaphthalene are converted to a novel D2 symmetric borane dimer, which can be oxidized to (+)-F12BINOL; resolution using (S)-acetoxypropanoyl chloride affords enantiopure material.
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Affiliation(s)
- Darryl J Morrison
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 4M5
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386
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Abstract
[graph: see text] Separation factors as high as 115 were observed for the chromatographic resolution of many alpha,alpha'-dihydroxybiaryls with a single chiral stationary phase made from readily available amino acid derivatives. The stationary phase works well for biphenyl-type compounds. It works extremely well for larger bis-aromatic compounds, such as binaphthyl-type compounds.
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Affiliation(s)
- Junmin Huang
- Department of Chemistry, Box 9573, Mississippi State University, Mississippi State, Mississippi 39762, USA
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387
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Shimada T, Suda M, Nagano T, Kakiuchi K. Facile Preparation of a New BINAP-Based Building Block, 5,5‘-DiiodoBINAP, and Its Synthetic Application. J Org Chem 2005; 70:10178-81. [PMID: 16292868 DOI: 10.1021/jo0517186] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Bis(pyridine)iodonium tetrafluoroborate was successfully used for regioselective iodination of BINAP dioxide to give 5,5'-diiodoBINAP dioxide in an excellent yield of 92%, with no observed formation of 4,4'-diiodoBINAP dioxide. A Sonogashira cross-coupling reaction with 5,5'-diiodoBINAP dioxide gave the desired bis(trimethylsilylethynyl) product in 86% yield. The resulting 5,5'-disubstituted BINAP dioxides were reduced to the corresponding phosphines, which were used as chiral ligands for rhodium-catalyzed asymmetric 1,4-addition of phenylboronic acid to 2-cyclohexenone to give 3-phenylcyclohexanone in excellent yield with high enantioselectivity.
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Affiliation(s)
- Toyoshi Shimada
- Department of Chemical Engineering, Nara National College of Technology, 22 Yata-cho, Yamatokoriyama, Nara 639-1080, Japan.
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Hopkins JM, Dalrymple SA, Parvez M, Keay BA. 3,3‘-Disubstituted BINAP Ligands: Synthesis, Resolution, and Applications in Asymmetric Hydrogenation. Org Lett 2005; 7:3765-8. [PMID: 16092870 DOI: 10.1021/ol051413d] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel family of BINAP ligands were prepared with alkoxy- and acetoxy-derived substituents in the 3,3'-positions. They were prepared through a convergent synthesis starting from readily available 4-bromo-2-naphthol. These ligands afforded excellent enantioselectivities in the asymmetric hydrogenation of substituted olefins. The presence of the 3,3'-substituents was shown to be beneficial by a direct comparison with the parent unsubstituted BINAP. [reaction: see text]
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Affiliation(s)
- J Matthew Hopkins
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
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