201
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Young KJ, Lokare KS, Leung CH, Cheng MJ, Nielsen RJ, Petasis NA, Goddard WA, Periana RA. Synthesis of osmium and ruthenium complexes bearing dimethyl (S,S)-2,2′-(pyridine-2,6-diyl)-bis-(4,5-dihydrooxazol-4-carboxylate) ligand and application to catalytic H/D exchange. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcata.2011.01.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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202
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Hermange P, Lindhardt AT, Taaning RH, Bjerglund K, Lupp D, Skrydstrup T. Ex situ generation of stoichiometric and substoichiometric 12CO and 13CO and its efficient incorporation in palladium catalyzed aminocarbonylations. J Am Chem Soc 2011; 133:6061-71. [PMID: 21446732 DOI: 10.1021/ja200818w] [Citation(s) in RCA: 340] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A new technique for the ex situ generation of carbon monoxide (CO) and its efficient incorporation in palladium catalyzed carbonylation reactions was achieved using a simple sealed two-chamber system. The ex situ generation of CO was derived by a palladium catalyzed decarbonylation of tertiary acid chlorides using a catalyst originating from Pd(dba)(2) and P(tBu)(3). Preliminary studies using pivaloyl chloride as the CO-precursor provided an alternative approach for the aminocarbonylation of 2-pyridyl tosylate derivatives using only 1.5 equiv of CO. Further design of the acid chloride CO-precursor led to the development of a new solid, stable, and easy to handle source of CO for chemical transformations. The synthesis of this CO-precursor also provided an entry point for the late installment of an isotopically carbon-labeled acid chloride for the subsequent release of gaseous [(13)C]CO. In combination with studies aimed toward application of CO as the limiting reagent, this method provided highly efficient palladium catalyzed aminocarbonylations with CO-incorporations up to 96%. The ex situ generated CO and the two-chamber system were tested in the synthesis of several compounds of pharmaceutical interest and all of them were labeled as their [(13)C]carbonyl counterparts in good to excellent yields based on limiting CO. Finally, palladium catalyzed decarbonylation at room temperature also allowed for a successful double carbonylation. This new protocol provides a facile and clean source of gaseous CO, which is safely handled and stored. Furthermore, since the CO is generated ex situ, excellent functional group tolerance is secured in the carbonylation chamber. Finally, CO is only generated and released in minute amounts, hence, eliminating the need for specialized equipment such as CO-detectors and equipment for running high pressure reactions.
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Affiliation(s)
- Philippe Hermange
- The Center for Insoluble Protein Structures (inSPIN), Department of Chemistry and the Interdisciplinary Nanoscience Center, Aarhus University, Langelandsgade 140, 8000 Aarhus, Denmark
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203
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Lee JY, You YS, Kang SH. Asymmetric synthesis of all-carbon quaternary stereocenters via desymmetrization of 2,2-disubstituted 1,3-propanediols. J Am Chem Soc 2011; 133:1772-4. [PMID: 21265528 DOI: 10.1021/ja1103102] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ji Young Lee
- Molecular-Level Interface Research Center, Department of Chemistry, KAIST, Daejeon 305-701, Korea
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204
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Abstract
The group 2 alkaline earth metals calcium (Ca), strontium (Sr), and barium (Ba) are among the most common elements on Earth, abundant in both the sea and the Earth's crust. Although they are familiar in our daily lives, their application to organic synthesis has, so far, been limited. Some particularly useful properties of these elements include (i) low electronegativity, (ii) a stable oxidation state of +2, meaning that they can potentially form two covalent bonds with anions, and (iii) the ability to occupy a variety of coordination sites due to their large ionic radius. Furthermore, the alkaline earth metals, found between the group 1 and group 3 elements, show mild but significant Lewis acidity, which can be harnessed to control coordinative molecules via a Lewis acid-base interaction. Taken together, these characteristics make the metals Ca, Sr, and Ba very promising components of highly functionalized acid-base catalysts. In this Account, we describe the development of chiral alkaline earth metal catalysts for asymmetric carbon-carbon bond-forming reactions. Recently prepared chiral alkaline earth metal complexes have shown high diastereo- and enantioselectivities in fundamental and important chemical transformations. We chose chiral bisoxazoline (Box) derivatives bearing a methylene tether as a ligand for chiral modification. These molecules are very useful because they can covalently coordinate to alkaline earth metals in a bidentate fashion through deprotonation of the tether portion. It was found that chiral calcium-Box complexes could successfully promote catalytic asymmetric 1,4-addition and [3 + 2] cycloaddition reactions with high diastereo- and enantioselectivities. Both the calcium-Box complexes and chiral strontium-bis-sulfonamide and chiral barium-BINOLate complexes could catalyze asymmetric 1,4-addition reactions with high enantioselectivities. Furthermore, we designed a calcium-neutral coordinative ligand complex as a new type of chiral alkaline earth metal catalyst. We found that pyridinebisoxazolines (Pybox) worked well: they served as excellent ligands for calcium compounds in 1,4-addition reactions and Mannich reactions. Moreover, they were successful in 1,4-additions in concert with enantioselective protonation, affording the desired products in good to high enantioselectivities. Our results demonstrate that alkaline earth metals are very useful and attractive catalysts in organic synthesis. Moreover, their ubiquity in the environment is a distinct advantage over rare metals for large-scale processes, and their minimal toxicity is beneficial in both handling and disposal.
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Affiliation(s)
- Shu̅ Kobayashi
- Department of Chemistry, School of Science and Graduate School of Pharmaceutical Sciences, The University of Tokyo, The HFRE Division, ERATO, Japan Science Technology Agency (JST), Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Yasuhiro Yamashita
- Department of Chemistry, School of Science and Graduate School of Pharmaceutical Sciences, The University of Tokyo, The HFRE Division, ERATO, Japan Science Technology Agency (JST), Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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205
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Le Roux E, Merle N, Törnroos KW. Synthesis and characterisation of trigonal C2-chiral di- and tetra-substituted bis(oxazoline) alkyl zinc complexes and their reactivity towards protic reagents. Dalton Trans 2011; 40:1768-77. [PMID: 21246135 DOI: 10.1039/c0dt01252a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Erwan Le Roux
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway.
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206
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Kruck M, Sauer DC, Enders M, Wadepohl H, Gade LH. Bis(2-pyridylimino)isoindolato iron(ii) and cobalt(ii) complexes: Structural chemistry and paramagnetic NMR spectroscopy. Dalton Trans 2011; 40:10406-15. [DOI: 10.1039/c1dt10617a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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207
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Yamamura M, Miyake J, Imamura Y, Nabeshima T. Ca2+-induced folding of a chiral ditopic receptor based on a Pybox ligand and enhancement of anion recognition. Chem Commun (Camb) 2011; 47:6801-3. [DOI: 10.1039/c0cc05799a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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208
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209
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Livieri A, Boiocchi M, Desimoni G, Faita G. Enantioselective Cycloadditions of 2‐Alkenoylpyridine‐
N
‐oxides Catalysed by a Bis(oxazoline)/Cu
II
Complex: Structure of the Reactive Intermediate. Chemistry 2010; 17:516-20. [DOI: 10.1002/chem.201002017] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2010] [Indexed: 11/09/2022]
Affiliation(s)
- Alessandro Livieri
- Department of Organic Chemistry, University of Pavia, V.le Taramelli, 10, 27100 Pavia (Italy), Fax: (+39) 0‐382‐987‐323
| | - Massimo Boiocchi
- Centro Grandi Strumenti, University of Pavia v. Bassi, 8, 27100 Pavia (Italy)
| | - Giovanni Desimoni
- Department of Organic Chemistry, University of Pavia, V.le Taramelli, 10, 27100 Pavia (Italy), Fax: (+39) 0‐382‐987‐323
| | - Giuseppe Faita
- Department of Organic Chemistry, University of Pavia, V.le Taramelli, 10, 27100 Pavia (Italy), Fax: (+39) 0‐382‐987‐323
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210
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Cryder JL, Killgore AJ, Moore C, Golen JA, Rheingold AL, Daley CJA. Novel metal complexes containing a chiral trinitrogen isoindoline-based pincer ligand: in situ synthesis and structural characterization. Dalton Trans 2010; 39:10671-7. [PMID: 20927427 DOI: 10.1039/c0dt00869a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first synthesis and characterization of metal coordinated complexes containing in situ prepared chiral trinitrogen 1,3-bis(4,5-dihydrooxazol-2-ylimino)isoindoline-based pincer ligands are reported. Two zinc complexes, isolated as Zn(L)(2), where L = 1,3-bis(4,5-dihydro-4-(R)-phenyloxazol-2-ylimino)isoindoline ((R,R)-5) or 1,3-bis(4,5-dihydro-4-(S)-iso-propyloxazol-2-ylimino)isoindoline ((S,S)-6), respectively, are reported. Complexes Zn((R,R)-5)(2) and Zn((S,S)-6)(2) were prepared in situ through the condensation of phthalonitrile with enantiopure 2-amino-4-(R)-phenyloxazoline ((R)-3) or 2-amino-4-(S)-iso-propyloxazoline ((S)-4) in the presence of ZnCl(2) at 80 °C in dry toluene over 3-4 days. The characterizations of Zn((R,R)-5)(2) and Zn((S,S)-6)(2) in both the solid (X-ray crystallography) and solution (multinuclear NMR spectroscopy) states are reported.
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Affiliation(s)
- Jessica L Cryder
- Department of Chemistry and Biochemistry, University of San Diego, 5998 Alcalá Park, San Diego, USA
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211
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Barluenga J, Lonzi G, Riesgo L, López LA, Tomás M. Pyridine Activation via Copper(I)-Catalyzed Annulation toward Indolizines. J Am Chem Soc 2010; 132:13200-2. [DOI: 10.1021/ja106751t] [Citation(s) in RCA: 176] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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212
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Liu TF, Wu WF, Zhang WG, Cui GH. Syntheses, Structures, and Luminescent Properties of Two Novel Coordination Polymers with Dipicolinate and Diimidazole Ligands. Z Anorg Allg Chem 2010. [DOI: 10.1002/zaac.201000270] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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213
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Lang K, Park J, Hong S. Development of Bifunctional Aza-Bis(oxazoline) Copper Catalysts for Enantioselective Henry Reaction. J Org Chem 2010; 75:6424-35. [DOI: 10.1021/jo1009867] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kai Lang
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
| | - Jongwoo Park
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
| | - Sukwon Hong
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
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214
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de Bettencourt-Dias A, Barber PS, Viswanathan S, de Lill DT, Rollett A, Ling G, Altun S. Para-Derivatized Pybox Ligands As Sensitizers in Highly Luminescent Ln(III) Complexes. Inorg Chem 2010; 49:8848-61. [DOI: 10.1021/ic101034y] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | - Patrick S. Barber
- University of Nevada, Reno, Department of Chemistry, Reno, Nevada 89557
| | - Subha Viswanathan
- Syracuse University, Department of Chemistry, Syracuse, New York 13244
| | - Daniel T. de Lill
- University of Nevada, Reno, Department of Chemistry, Reno, Nevada 89557
| | - Alexandra Rollett
- Syracuse University, Department of Chemistry, Syracuse, New York 13244
| | - George Ling
- Syracuse University, Department of Chemistry, Syracuse, New York 13244
| | - Sultan Altun
- University of Nevada, Reno, Department of Chemistry, Reno, Nevada 89557
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215
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216
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Ostermeier M, Berlin MA, Meudtner R, Demeshko S, Meyer F, Limberg C, Hecht S. Complexes of Click-Derived Bistriazolylpyridines: Remarkable Electronic Influence of Remote Substituents on Thermodynamic Stability as well as Electronic and Magnetic Properties. Chemistry 2010; 16:10202-13. [DOI: 10.1002/chem.201000721] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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217
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218
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219
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220
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Matsumoto K, Suzuki K, Tsukuda T, Tsubomura T. A Chiral 2,6-Bis(Oxazolinyl)Pyridine Ligand with Amide Groups to Form Isomorphous Complexes through All the Lanthanoid Series. Inorg Chem 2010; 49:4717-9. [DOI: 10.1021/ic901743q] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kenji Matsumoto
- Department of Materials and Life Science, Seikei University, 3-3-1 Kichijoji-kitamachi, Musashino, Tokyo, 180-8633, Japan
| | - Keita Suzuki
- Department of Materials and Life Science, Seikei University, 3-3-1 Kichijoji-kitamachi, Musashino, Tokyo, 180-8633, Japan
| | - Toshiaki Tsukuda
- Department of Materials and Life Science, Seikei University, 3-3-1 Kichijoji-kitamachi, Musashino, Tokyo, 180-8633, Japan
| | - Taro Tsubomura
- Department of Materials and Life Science, Seikei University, 3-3-1 Kichijoji-kitamachi, Musashino, Tokyo, 180-8633, Japan
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221
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Tsubogo T, Kano Y, Ikemoto K, Yamashita Y, Kobayashi S. Synthesis of optically active, unnatural α-substituted glutamic acid derivatives by a chiral calcium-catalyzed 1,4-addition reaction. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.03.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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222
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Liu H, Du DM. Development of Diphenylamine-Linked Bis(imidazoline) Ligands and Their Application in Asymmetric Friedel-Crafts Alkylation of Indole Derivatives with Nitroalkenes. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000111] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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223
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Li WJ, Qiu SX. A Novel D2-Symmetrical Chiral Tetraoxazoline Ligand for Highly Enantioselective Hydrosilylation of Aromatic Ketones. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000018] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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224
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Bartók M. Unexpected inversions in asymmetric reactions: reactions with chiral metal complexes, chiral organocatalysts, and heterogeneous chiral catalysts. Chem Rev 2010; 110:1663-705. [PMID: 19873975 DOI: 10.1021/cr9002352] [Citation(s) in RCA: 310] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mihály Bartók
- Department of Organic Chemistry, University of Szeged, Stereochemistry Research Group of the Hungarian Academy of Sciences, Dóm tér 8, H-6720 Szeged, Hungary
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225
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Faita G, Mella M, Toscanini M, Desimoni G. Asymmetric Friedel–Crafts alkylation of activated benzenes with methyl (E)-2-oxo-4-aryl-3-butenoates catalyzed by [Pybox/Sc(OTf)3]. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.02.054] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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226
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Li WJ, Xu ZL, Qiu SX. Concise methods for the synthesis of chiral polyoxazolines and their application in asymmetric hydrosilylation. Beilstein J Org Chem 2010; 6:29. [PMID: 20502654 PMCID: PMC2874315 DOI: 10.3762/bjoc.6.29] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2010] [Accepted: 03/16/2010] [Indexed: 11/23/2022] Open
Abstract
Seven polyoxazoline ligands were synthesized in high yield in a one-pot reaction by heating polycarboxylic acids or their esters and chiral β-amino alcohols under reflux with concomitant removal of water or the alcohol produced in the reaction. The method is much simpler and more efficient in comparison to those methods reported in the literature.The compounds were used as chiral ligands in the rhodium-catalyzed asymmetric hydrosilylation of aromatic ketones, and the effects of the linkers and the substituents present on the oxazoline rings on the yield and enantioselectivity investigated. Compound 2 was identified as the best ligand of this family for the hydrosilylation of aromatic ketones.
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Affiliation(s)
- Wei Jie Li
- Program for Natural Product Chemical Biology & Drug Discovery, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Tianhe District, Guangzhou 510650, China.
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227
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Ternel J, Delevoye L, Agbossou-Niedercorn F, Roisnel T, Gauvin RM, Thomas CM. Design of a well-defined, silica-supported chiral Zn scaffold for enantioselective catalysis. Dalton Trans 2010; 39:3802-4. [PMID: 20372704 DOI: 10.1039/c003552c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New compound Zn[(S,S)-iPr-pybox](Et)(2) (1) was fully characterized, including by X-ray diffraction structural studies. Its grafting onto partially dehydroxylated silica affords material 2, which bears well-defined chiral ([triple bond]SiO)Zn[(S,S)-iPr-pybox](Et) sites. Hybrid material 2 displays significantly better catalytic performances than 1 in enantioselective silylcyanation, thus demonstrating a beneficial grafting effect.
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228
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Inagaki T, Phong L, Furuta A, Ito JI, Nishiyama H. Iron- and Cobalt-Catalyzed Asymmetric Hydrosilylation of Ketones and Enones with Bis(oxazolinylphenyl)amine Ligands. Chemistry 2010; 16:3090-6. [DOI: 10.1002/chem.200903118] [Citation(s) in RCA: 186] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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229
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Peng F, Shao Z, Chan AS. Copper(I)-catalyzed enantioselective alkynylation of α-imino esters: ligand-to-metal ratio effects and mechanistic studies. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.02.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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230
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Nakamura S, Ohara M, Nakamura Y, Shibata N, Toru T. Copper-Catalyzed Enantioselective Three-Component Synthesis of Optically Active Propargylamines from Aldehydes, Amines, and Aliphatic Alkynes. Chemistry 2010; 16:2360-2. [DOI: 10.1002/chem.200903550] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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231
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Drabina P, Funk P, Růžička A, Hanusek J, Sedlák M. Synthesis, copper(II) complexes and catalytic activity of substituted 6-(1,3-oxazolin-2-yl)pyridine-2-carboxylates. TRANSIT METAL CHEM 2010. [DOI: 10.1007/s11243-010-9336-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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232
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Panera M, Díez J, Merino I, Rubio E, Gamasa MP. Synthesis of copper(I) complexes containing enantiopure pybox ligands. First assays on enantioselective synthesis of propargylamines catalyzed by isolated copper(I) complexes. Inorg Chem 2010; 48:11147-60. [PMID: 19883049 DOI: 10.1021/ic901527x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dinuclear [Cu(2)(R-pybox)(2)][X](2) [X = PF(6), R-pybox = 2,6-bis[4'-(S)-isopropyloxazolin-2'-yl]pyridine (S,S)-(i)Pr-pybox (1), 2,6-bis[4'-(R)-phenyloxazolin-2'-yl]pyridine) (R,R)-Ph-pybox (2), 2,6-bis[4'-(S)-isopropyl-5',5'-difeniloxazolin-2'-yl]pyridine (S,S)-(i)Pr-pybox-diPh (3); X = OTf, (R,R)-Ph-pybox (4)] and mononuclear complexes [Cu(R-pybox)(2)][PF(6)] [R-pybox = (S,S)-(i)Pr-pybox (5), (R,R)-Ph-pybox (6)] have been diastereoselectively prepared by reaction of [Cu(MeCN)(4)][PF(6)] or CuOTf.0.5C(6)H(6) and the corresponding pybox ligand. The reaction of CuX (X = I, Br, Cl) with substituted pybox in a 2:1 molar ratio allows us to synthesize tetranuclear complexes [Cu(4)X(4)(R-pybox}(2)] [R-pybox = (S,S)-(i)Pr-pybox, X = I (7), Br (8); (R,R)-Ph-pybox, X = I (9), Br (10), Cl (11); (S,S)-(i)Pr-pybox-diPh, X = I (12), Cl (13)]. Dinuclear complexes [Cu(2)(mu-Cl)(R-pybox)(2)][CuCl(2)] [R-pybox = (S,S)-(i)Pr-pybox (15), (R,R)-Ph-pybox (16)] have been prepared by reaction of CuCl with (i)Pr-pybox or Ph-pybox in 3:2 molar ratio. The structures of the complexes 1, 2, 7, 15, 16 and that of the polymeric species [Cu(4)(mu(3)-Br)(3)(mu-Br)((i)Pr-pybox)](n) (14) have been determined by single-crystal X-ray diffraction analysis. Diffusion studies using (1)H and (19)F-DOSY experiments provide evidence that the different nuclearity of compounds 1 and 5 is maintained in the solution state and confirm that these ionic compounds exist in solution as stable, discrete, cationic complexes. The complexes 1-4, 6, 9, 10, and 16 as well as the previously reported [Cu(2){(S,S)-(i)Pr-pybox}(2)][OTf](2) have been assayed as catalysts in the enantioselective synthesis of propargylamines. The dinuclear complexes [Cu(2){(R,R)-Ph-pybox}(2)][X](2) (2, 4) were found to be the most efficient catalysts (up to 89% e.e.).
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Affiliation(s)
- María Panera
- Departamento de Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica Enrique Moles (Unidad Asociada al C.S.I.C.), Universidad de Oviedo, 33071 Oviedo, Principado de Asturias, Spain
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233
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Rational tuning of the rigidity of a ligand scaffold: synthesis of diphenylsulfide-linked bis(oxazoline) ligands and their application in asymmetric allylic alkylation. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.01.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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234
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Sydnes MO, Miyazaki A, Isobe M, Ohinata H, Miyazu M, Takai A. Development of a new protein labeling strategy, oxidation labeling. part 1: Preliminary evaluation and synthesis of tautomycin containing a metal coordinating unit. Tetrahedron 2010. [DOI: 10.1016/j.tet.2009.12.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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235
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Fang X, Liu K, Li C. Efficient Regio- and Stereoselective Formation of Azocan-2-ones via 8-Endo Cyclization of α-Carbamoyl Radicals. J Am Chem Soc 2010; 132:2274-83. [DOI: 10.1021/ja9082649] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xinqiang Fang
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
| | - Kun Liu
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
| | - Chaozhong Li
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
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236
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Fan LL, Guo FS, Yun L, Lin ZJ, Herchel R, Leng JD, Ou YC, Tong ML. Chiral transition metal clusters from two enantiomeric schiff base ligands. Synthesis, structures, CD spectra and magnetic properties. Dalton Trans 2010; 39:1771-80. [DOI: 10.1039/b917091j] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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237
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Constable EC, Zhang G, Housecroft CE, Neuburger M, Zampese JA. π-Stacking and hydrogen bonding direct diastereoselectivity in one-pot syntheses of octahedral iron(ii) complexes. Chem Commun (Camb) 2010; 46:3077-9. [DOI: 10.1039/b927071j] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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238
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François-Endelmond C, Carlin T, Thuery P, Loreau O, Taran F. A Phosphine-Mediated Construction of 1,4-Oxazepines and 1,3-Oxazines. Org Lett 2009; 12:40-2. [DOI: 10.1021/ol9024309] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Céline François-Endelmond
- CEA, iBiTecS, Service de Chimie Bioorganique et de Marquage, Gif sur Yvette, F-91191, France, and CEA, IRAMIS, Service de Chimie Moléculaire, Gif sur Yvette, F-91191, France
| | - Thomas Carlin
- CEA, iBiTecS, Service de Chimie Bioorganique et de Marquage, Gif sur Yvette, F-91191, France, and CEA, IRAMIS, Service de Chimie Moléculaire, Gif sur Yvette, F-91191, France
| | - Pierre Thuery
- CEA, iBiTecS, Service de Chimie Bioorganique et de Marquage, Gif sur Yvette, F-91191, France, and CEA, IRAMIS, Service de Chimie Moléculaire, Gif sur Yvette, F-91191, France
| | - Olivier Loreau
- CEA, iBiTecS, Service de Chimie Bioorganique et de Marquage, Gif sur Yvette, F-91191, France, and CEA, IRAMIS, Service de Chimie Moléculaire, Gif sur Yvette, F-91191, France
| | - Frédéric Taran
- CEA, iBiTecS, Service de Chimie Bioorganique et de Marquage, Gif sur Yvette, F-91191, France, and CEA, IRAMIS, Service de Chimie Moléculaire, Gif sur Yvette, F-91191, France
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239
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Nandakumar MV, Ghosh S, Schneider C. Enantioselective Synthesis of a Novel Chiral 2,9-Disubstituted 1,10-Phenanthroline and First Applications in Asymmetric Catalysis. European J Org Chem 2009. [DOI: 10.1002/ejoc.200901038] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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240
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Coluccini C, Pasini D, Righetti P, Vander Griend DA. Dynamic switching between binding sites in the complexation of macrocyclic ‘push–pull’ chromophores to lanthanides. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.10.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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241
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Sakakura A, Kondo R, Matsumura Y, Akakura M, Ishihara K. Rational Design of Highly Effective Asymmetric Diels−Alder Catalysts Bearing 4,4′-Sulfonamidomethyl Groups. J Am Chem Soc 2009; 131:17762-4. [DOI: 10.1021/ja906098b] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akira Sakakura
- EcoTopia Science Institute, Graduate School of Engineering and JST, CREST, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603, Japan, and Department of Chemistry, Aichi University of Education, Igaya-cho, Kariya, 448-8542, Japan
| | - Rei Kondo
- EcoTopia Science Institute, Graduate School of Engineering and JST, CREST, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603, Japan, and Department of Chemistry, Aichi University of Education, Igaya-cho, Kariya, 448-8542, Japan
| | - Yuki Matsumura
- EcoTopia Science Institute, Graduate School of Engineering and JST, CREST, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603, Japan, and Department of Chemistry, Aichi University of Education, Igaya-cho, Kariya, 448-8542, Japan
| | - Matsujiro Akakura
- EcoTopia Science Institute, Graduate School of Engineering and JST, CREST, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603, Japan, and Department of Chemistry, Aichi University of Education, Igaya-cho, Kariya, 448-8542, Japan
| | - Kazuaki Ishihara
- EcoTopia Science Institute, Graduate School of Engineering and JST, CREST, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603, Japan, and Department of Chemistry, Aichi University of Education, Igaya-cho, Kariya, 448-8542, Japan
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242
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Nishiyama H, Ito JI. Bis(oxazolinyl)phenyl transition-metal complexes: asymmetric catalysis and some reactions of the metals. Chem Commun (Camb) 2009; 46:203-12. [PMID: 20024328 DOI: 10.1039/b918923h] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several transition-metal complexes that bind the bis(oxazolinyl)phenyl moiety as a tridentate ligand have been prepared to showcase their highly potent activities for asymmetric catalysis in conjugate reductions, reductive aldol reactions, direct aldol reactions and hydrogenation reactions. Some reactions of the metals were also examined.
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Affiliation(s)
- Hisao Nishiyama
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya, 464-8603, Japan.
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243
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Tsubogo T, Yamashita Y, Kobayashi S. Chiral Calcium Catalysts with Neutral Coordinative Ligands: Enantioselective 1,4-Addition Reactions of 1,3-Dicarbonyl Compounds to Nitroalkenes. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200902902] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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244
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Tsubogo T, Yamashita Y, Kobayashi S. Chiral Calcium Catalysts with Neutral Coordinative Ligands: Enantioselective 1,4-Addition Reactions of 1,3-Dicarbonyl Compounds to Nitroalkenes. Angew Chem Int Ed Engl 2009; 48:9117-20. [DOI: 10.1002/anie.200902902] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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245
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He W, Yip KT, Zhu NY, Yang D. Pd(II)/tBu-quinolineoxazoline: An Air-Stable and Modular Chiral Catalyst System for Enantioselective Oxidative Cascade Cyclization. Org Lett 2009; 11:5626-8. [DOI: 10.1021/ol902348t] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wei He
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong (P. R. China), Department of Chemistry, The Fourth Military Medical University, Changle Road, Xi’an (P. R. China)
| | - Kai-Tai Yip
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong (P. R. China), Department of Chemistry, The Fourth Military Medical University, Changle Road, Xi’an (P. R. China)
| | - Nian-Yong Zhu
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong (P. R. China), Department of Chemistry, The Fourth Military Medical University, Changle Road, Xi’an (P. R. China)
| | - Dan Yang
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong (P. R. China), Department of Chemistry, The Fourth Military Medical University, Changle Road, Xi’an (P. R. China)
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246
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Phosphine-oxazoline ligands with an axial-unfixed biphenyl backbone: the effects of the substituent at oxazoline ring and P phenyl ring on Pd-catalyzed asymmetric allylic alkylation. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.09.053] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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247
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Desimoni G, Faita G, Toscanini M, Boiocchi M. A New CopperII/Isopropylidene-2,2-bis(oxazoline) Catalyst and Its Stable Reactive Complex with Acryloyloxazolidinone in Enantioselective Reactions. Chemistry 2009; 15:9674-7. [DOI: 10.1002/chem.200900908] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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248
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Saito T, Kikuchi T, Tanabe H, Yahiro J, Otani T. Enantioselective synthesis of β-lactams via the IndaBox–Cu(II)-catalyzed Kinugasa reaction. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.06.050] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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249
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Iodine-catalyzed 1,4-addition of 2-(trimethylsilyloxy)furan to α,β-unsaturated ketones: a facile synthesis of γ-butenolides. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.02.128] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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250
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Liu LJ, Wang F, Shi M. Synthesis of Chiral Bis(N-heterocyclic carbene) Palladium and Rhodium Complexes with 1,1′-Biphenyl Scaffold and Their Application in Asymmetric Catalysis. Organometallics 2009. [DOI: 10.1021/om900320c] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lian-jun Liu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 MeiLong Road, Shanghai 200237, People’s Republic of China
| | - Feijun Wang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 MeiLong Road, Shanghai 200237, People’s Republic of China
| | - Min Shi
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 MeiLong Road, Shanghai 200237, People’s Republic of China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, People’s Republic of China
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