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Moser D, Sparr C. Synthesis of Atropisomeric Two‐Axis Systems by the Catalyst‐Controlled
syn
‐ and
anti
‐Selective Arene‐Forming Aldol Condensation. Angew Chem Int Ed Engl 2022; 61:e202202548. [PMID: 35343034 PMCID: PMC9322266 DOI: 10.1002/anie.202202548] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Indexed: 12/21/2022]
Abstract
Simultaneous control over the configuration of multiple stereocenters is accomplished by numerous catalytic methods, providing a reliable basis for the synthesis of stereochemically complex targets in isomerically defined form. In contrast, addressing the configurations of multiple stereogenic axes with diastereodivergent catalyst control is thus far only possible by stepwise approaches. Herein we now describe that all four stereoisomers of atropisomeric two‐axis systems are directly tractable by assembling a central aromatic unit of teraryls through an arene‐forming aldol condensation. By using cinchona alkaloid‐based ion‐pairing catalysts, the four feasible reaction pathways are differentiated from identical substrates under defined basic conditions without preactivation, thus enabling complete stereodivergence with enantioselectivities of up to 99 : 1 e.r.
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Affiliation(s)
- Daniel Moser
- Department of Chemistry University of Basel St. Johanns-Ring 19 4056 Basel Switzerland
- NCCR Molecular Systems Engineering BPR 1095 Mattenstrasse 24a 4058 Basel Switzerland
| | - Christof Sparr
- Department of Chemistry University of Basel St. Johanns-Ring 19 4056 Basel Switzerland
- NCCR Molecular Systems Engineering BPR 1095 Mattenstrasse 24a 4058 Basel Switzerland
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2
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Moser D, Sparr C. Synthesis of Atropisomeric Two‐Axis Systems by the Catalyst‐ Controlled syn‐ and anti‐Selective Arene‐Forming Aldol Condensation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202202548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Daniel Moser
- University of Basel: Universitat Basel Department of Chemistry SWITZERLAND
| | - Christof Sparr
- University of Basel Department of Chemistry St. Johanns-Ring 19 4056 Basel SWITZERLAND
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3
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Zhou M, Tsien J, Qin T. Sulfur(IV)-Mediated Unsymmetrical Heterocycle Cross-Couplings. Angew Chem Int Ed Engl 2020; 59:7372-7376. [PMID: 32043749 DOI: 10.1002/anie.201915425] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Indexed: 11/09/2022]
Abstract
Despite the tremendous utilities of metal-mediated cross-couplings in modern organic chemistry, coupling reactions involving nitrogenous heteroarenes remain a challenging undertaking - coordination of Lewis basic atoms into metal centers often necessitate elevated temperature, high catalyst loading, etc. Herein, we report a sulfur (IV) mediated cross-coupling amendable for the efficient synthesis of heteroaromatic substrates. Addition of heteroaryl nucleophiles to a simple, readily-accessible alkyl sulfinyl (IV) chloride allows formation of a trigonal bipyramidal sulfurane intermediate. Reductive elimination therefrom provides bis-heteroaryl products in a practical and efficient fashion.
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Affiliation(s)
- Min Zhou
- Department of Biochemistry, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390-9038, USA
| | - Jet Tsien
- Department of Biochemistry, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390-9038, USA
| | - Tian Qin
- Department of Biochemistry, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390-9038, USA
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4
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Zhou M, Tsien J, Qin T. Sulfur(IV)‐Mediated Unsymmetrical Heterocycle Cross‐Couplings. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201915425] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Min Zhou
- Department of BiochemistryThe University of Texas Southwestern Medical Center 5323 Harry Hines Boulevard Dallas TX 75390-9038 USA
| | - Jet Tsien
- Department of BiochemistryThe University of Texas Southwestern Medical Center 5323 Harry Hines Boulevard Dallas TX 75390-9038 USA
| | - Tian Qin
- Department of BiochemistryThe University of Texas Southwestern Medical Center 5323 Harry Hines Boulevard Dallas TX 75390-9038 USA
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5
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Hönig M, Sondermann P, Turner NJ, Carreira EM. Enantioselective Chemo- and Biocatalysis: Partners in Retrosynthesis. Angew Chem Int Ed Engl 2017; 56:8942-8973. [DOI: 10.1002/anie.201612462] [Citation(s) in RCA: 194] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Moritz Hönig
- Laboratorium für Organische Chemie; Eidgenössische Technische Hochschule Zürich; Vladimir-Prelog-Weg 3 8093 Zürich Switzerland
| | - Philipp Sondermann
- Laboratorium für Organische Chemie; Eidgenössische Technische Hochschule Zürich; Vladimir-Prelog-Weg 3 8093 Zürich Switzerland
| | - Nicholas J. Turner
- Manchester Institute of Biotechnology & School of Chemistry; University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Erick M. Carreira
- Laboratorium für Organische Chemie; Eidgenössische Technische Hochschule Zürich; Vladimir-Prelog-Weg 3 8093 Zürich Switzerland
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6
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Hönig M, Sondermann P, Turner NJ, Carreira EM. Enantioselektive Chemo- und Biokatalyse: Partner in der Retrosynthese. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612462] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Moritz Hönig
- Laboratorium für Organische Chemie; Eidgenössische Technische Hochschule Zürich; Vladimir-Prelog-Weg 3 8093 Zürich Schweiz
| | - Philipp Sondermann
- Laboratorium für Organische Chemie; Eidgenössische Technische Hochschule Zürich; Vladimir-Prelog-Weg 3 8093 Zürich Schweiz
| | - Nicholas J. Turner
- Manchester Institute of Biotechnology & School of Chemistry; University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Erick M. Carreira
- Laboratorium für Organische Chemie; Eidgenössische Technische Hochschule Zürich; Vladimir-Prelog-Weg 3 8093 Zürich Schweiz
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Sakamoto Y, Amaya T, Suzuki T, Hirao T. Palladium(II)-Catalyzed Dehydroboration via Generation of Boron Enolates. Chemistry 2016; 22:18686-18689. [PMID: 27734542 DOI: 10.1002/chem.201604306] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Indexed: 02/01/2023]
Abstract
The PdII -catalyzed dehydroboration of boron enolates generated from ketones and 9-iodo-9-borabicyclo[3.3.1]nonane was achieved, providing a synthetically versatile protocol from ketones to α,β-unsaturated ketones. The PdII compound employed in this reaction worked catalytically in the presence of Cu(OAc)2 . The high trans-selectivity of the olefinic moiety was observed. Aryl halide moieties (-Br and -Cl) remained intact for this reaction in spite of the presence of a Pd species. An ester substrate could also be applied when a stoichiometric amount of PdII was used. The crossover reactions using boron and silyl enolates revealed that the oxidation reaction is much faster than the Saegusa-Ito reaction.
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Affiliation(s)
- Yuki Sakamoto
- The Institute of Scientific and Industrial Research, Osaka University, Mihoga-oka, Ibaraki, Osaka, 567-0047, Japan
| | - Toru Amaya
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - Takeyuki Suzuki
- The Institute of Scientific and Industrial Research, Osaka University, Mihoga-oka, Ibaraki, Osaka, 567-0047, Japan
| | - Toshikazu Hirao
- The Institute of Scientific and Industrial Research, Osaka University, Mihoga-oka, Ibaraki, Osaka, 567-0047, Japan
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Konishi A, Minami Y, Hosoi T, Chiba K, Yasuda M. First Isolation and Characterization of the Highly Coordinated Group 14 Enolates: Effects of the Coordination Controls on the Geometry and Tautomerization of Germyl Enolates. Chemistry 2016; 22:12688-91. [PMID: 27377796 DOI: 10.1002/chem.201603147] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Indexed: 11/09/2022]
Abstract
The Group 14 enolates play an important part in many organic reactions. Herein, the reduction of an α-bromo ketone with germanium(II) salts cleanly afforded the corresponding germyl enolate as an isolatable species. This experimental reductive generation of a germyl enolate enabled us to characterize both C- and O-bound tautomers derived from an identical precursor and to unveil the tautomeric mechanisms, including the kinetic parameters and the relative stability of these tautomers, along with confirmation from DFT calculations. Moreover, the highly coordinated germyl enolates were isolated by a stabilization process induced by adding ligands. All products were characterized by NMR spectroscopy and X-ray crystallography.
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Affiliation(s)
- Akihito Konishi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yohei Minami
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Takahisa Hosoi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kouji Chiba
- Science and Technology System Division, Ryoka Systems Inc., Tokyo Skytree East Tower, 1-1-2 Oshiage, Sumida-ku, Tokyo, 131-0045, Japan
| | - Makoto Yasuda
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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Kanbayashi N, Yamazawa A, Takii K, Okamura TA, Onitsuka K. Planar-Chiral Cyclopentadienyl-Ruthenium-Catalyzed Regio- and Enantioselective Asymmetric Allylic Alkylation of Silyl Enolates under Unusually Mild Conditions. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500970] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Allais C, Tsai AS, Nuhant P, Roush WR. Generation of stereochemically defined tetrasubstituted enolborinates by 1,4-hydroboration of α,β-unsaturated morpholine carboxamides with (diisopinocampheyl)borane. Angew Chem Int Ed Engl 2013; 52:12888-12891. [PMID: 24281884 PMCID: PMC3910328 DOI: 10.1002/anie.201307302] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 09/15/2013] [Indexed: 11/10/2022]
Abstract
On all fours: The title reaction with (Ipc)2 BH provides tetrasubstituted enolborinates which undergo aldol reactions with aldehydes to form products with all-carbon quaternary centers with exceptional diastereo- and enantioselectivity. A change to the substitution pattern of the starting amide leads to either diastereomer of the α-methyl-α-ethyl-β-hydroxy carboxamide (1 or 2).
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Affiliation(s)
- Christophe Allais
- Department of Chemistry The Scripps Research Institute 130 Scripps Way,
3A2, Jupiter FL 33458 (USA)
| | - Andy S. Tsai
- Department of Chemistry The Scripps Research Institute 130 Scripps Way,
3A2, Jupiter FL 33458 (USA)
| | - Philippe Nuhant
- Department of Chemistry The Scripps Research Institute 130 Scripps Way,
3A2, Jupiter FL 33458 (USA)
| | - William R. Roush
- Department of Chemistry The Scripps Research Institute 130 Scripps Way,
3A2, Jupiter FL 33458 (USA)
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11
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Allais C, Tsai AS, Nuhant P, Roush WR. Generation of Stereochemically Defined Tetrasubstituted Enolborinates by 1,4-Hydroboration of α,β-Unsaturated Morpholine Carboxamides with (Diisopinocampheyl)borane. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307302] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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12
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Saidalimu I, Fang X, He XP, Liang J, Yang X, Wu F. Highly Enantioselective Construction of 3-Hydroxy Oxindoles through a Decarboxylative Aldol Addition of Trifluoromethyl α-Fluorinatedgem-Diols toN-Benzyl Isatins. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301443] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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13
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Saidalimu I, Fang X, He XP, Liang J, Yang X, Wu F. Highly enantioselective construction of 3-hydroxy oxindoles through a decarboxylative aldol addition of trifluoromethyl α-fluorinated gem-diols to N-benzyl isatins. Angew Chem Int Ed Engl 2013; 52:5566-70. [PMID: 23589222 DOI: 10.1002/anie.201301443] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Indexed: 11/05/2022]
Affiliation(s)
- Ibrayim Saidalimu
- Key Laboratory for Advanced Material and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, P.R. China
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Yoshida A, Akaiwa M, Asakawa T, Hamashima Y, Yokoshima S, Fukuyama T, Kan T. Total synthesis of (-)-lemonomycin. Chemistry 2012; 18:11192-5. [PMID: 22848018 DOI: 10.1002/chem.201202073] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Indexed: 11/10/2022]
Affiliation(s)
- Atsushi Yoshida
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, Japan
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15
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Liu Y, Zeng X, Zhou J. Ethylene Glycol: A Powerful Catalyst‐Free Medium for CC Bond‐Forming Reactions. Chem Asian J 2012; 7:1759-63. [DOI: 10.1002/asia.201200289] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Indexed: 11/10/2022]
Affiliation(s)
- Yun‐Lin Liu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663N, Zhongshan Road, Shanghai 200062 (China), Fax: (+86) 21‐62234560
| | - Xing‐Ping Zeng
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663N, Zhongshan Road, Shanghai 200062 (China), Fax: (+86) 21‐62234560
| | - Jian Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663N, Zhongshan Road, Shanghai 200062 (China), Fax: (+86) 21‐62234560
- State Key Laboratory of Elemento‐organic Chemistry, Nankai University, Tianjin 300071 (P. R. China)
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Ma G, Bartoszewicz A, Ibrahem I, Córdova A. Highly Enantioselective Co-Catalytic Direct Aldol Reactions by Combination of Hydrogen-Bond Donating and Acyclic Amino Acid Catalysts. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100408] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Zhang Y, Lay F, García-García P, List B, Chen EX. High-Speed Living Polymerization of Polar Vinyl Monomers by Self-Healing Silylium Catalysts. Chemistry 2010; 16:10462-73. [DOI: 10.1002/chem.201000961] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Olmos A, Alix A, Sommer J, Pale P. ScIII-Doped Zeolites as New Heterogeneous Catalysts: Mukaiyama Aldol Reaction. Chemistry 2009; 15:11229-34. [DOI: 10.1002/chem.200901647] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Yanagisawa A, Satou T, Izumiseki A, Tanaka Y, Miyagi M, Arai T, Yoshida K. Methanol-Assisted Catalysis by Chiral Tin Methoxides: An Alternative Asymmetric Aldol Process. Chemistry 2009; 15:11450-3. [DOI: 10.1002/chem.200901822] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yanagisawa A, Terajima Y, Sugita K, Yoshida K. Asymmetric Aldol Reaction of Ketones with Alkenyl Trichloroacetates Catalyzed by Dibutyltin Dimethoxide and BINAP⋅Silver(I) Complex: Construction of a Chiral Tertiary Carbon Center. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900437] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Harnessing the Potential of N‐Heterocyclic Carbenes for the Rejuvenation of Group‐Transfer Polymerization of (Meth)Acrylics. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200800490] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Raynaud J, Ciolino A, Baceiredo A, Destarac M, Bonnette F, Kato T, Gnanou Y, Taton D. Harnessing the Potential of N‐Heterocyclic Carbenes for the Rejuvenation of Group‐Transfer Polymerization of (Meth)Acrylics. Angew Chem Int Ed Engl 2008; 47:5390-3. [DOI: 10.1002/anie.200800490] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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Evans DA, Dunn TB, Kvaernø L, Beauchemin A, Raymer B, Olhava EJ, Mulder JA, Juhl M, Kagechika K, Favor DA. Total Synthesis of (+)-Azaspiracid-1. Part II: Synthesis of the EFGHI Sulfone and Completion of the Synthesis. Angew Chem Int Ed Engl 2007; 46:4698-703. [PMID: 17546578 DOI: 10.1002/anie.200701520] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- David A Evans
- Department of Chemistry & Chemical Biology, Harvard University, Cambridge, MA 02138, USA.
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24
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Evans D, Dunn T, Kværnø L, Beauchemin A, Raymer B, Olhava E, Mulder J, Juhl M, Kagechika K, Favor D. Total Synthesis of (+)-Azaspiracid-1. Part II: Synthesis of the EFGHI Sulfone and Completion of the Synthesis. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200701520] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Córdova A, Zou W, Dziedzic P, Ibrahem I, Reyes E, Xu Y. Direct asymmetric intermolecular aldol reactions catalyzed by amino acids and small peptides. Chemistry 2007; 12:5383-97. [PMID: 16637082 DOI: 10.1002/chem.200501639] [Citation(s) in RCA: 224] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In nature there are at least nineteen different acyclic amino acids that act as the building blocks of polypeptides and proteins with different functions. Here we report that alpha-amino acids, beta-amino acids, and chiral amines containing primary amine functions catalyze direct asymmetric intermolecular aldol reactions with high enantioselectivities. Moreover, the amino acids can be combined into highly modular natural and unusual small peptides that also catalyze direct asymmetric intermolecular aldol reactions with high stereoselectivities, to furnish the corresponding aldol products with up to >99 % ee. Simple amino acids and small peptides can thus catalyze asymmetric aldol reactions with stereoselectivities matching those of natural enzymes that have evolved over billions of years. A small amount of water accelerates the asymmetric aldol reactions catalyzed by amino acids and small peptides, and also increases their stereoselectivities. Notably, small peptides and amino acid tetrazoles were able to catalyze direct asymmetric aldol reactions with high enantioselectivities in water, while the parent amino acids, in stark contrast, furnished nearly racemic products. These results suggest that the prebiotic oligomerization of amino acids to peptides may plausibly have been a link in the evolution of the homochirality of sugars. The mechanism and stereochemistry of the reactions are also discussed.
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Affiliation(s)
- Armando Córdova
- Department of Organic Chemistry, The Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, Sweden.
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26
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Cho S, Chang S. Rate-Accelerated Nonconventional Amide Synthesis in Water: A Practical Catalytic Aldol-Surrogate Reaction. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200604358] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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27
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Cho SH, Chang S. Rate-Accelerated Nonconventional Amide Synthesis in Water: A Practical Catalytic Aldol-Surrogate Reaction. Angew Chem Int Ed Engl 2007; 46:1897-900. [PMID: 17450617 DOI: 10.1002/anie.200604358] [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]
Affiliation(s)
- Seung Hwan Cho
- Center for Molecular Design and Synthesis (CMDS), Department of Chemistry and School of Molecular Science (BK21), Korea
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Ünaldi S, Özlügedik M, Fröhlich R, Hoppe D. Diastereoselective Synthesis of Enantioenriched, Annulated Tetrahydrofurans by Simultaneous Formation of the O-1C-5 and the C-5C-4 Bonds. Adv Synth Catal 2005. [DOI: 10.1002/adsc.200505142] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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