51
|
Affiliation(s)
- Jarl Ivar van der Vlugt
- Supramolecular & Homogeneous Catalysis, van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands, Fax: +31‐20‐5255604
| |
Collapse
|
52
|
Gjoka B, Romano F, Zonta C, Licini G. Effective Synthesis of ortho-Substituted Trithiophenol Amines by Miyazaki-Newman-Kwart Rearrangement. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100977] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
53
|
Zonta C, Kolarovic A, Mba M, Pontini M, KÜndig EP, Licini G. Enantiopure Ti(IV) amino triphenolate complexes as NMR chiral solvating agents. Chirality 2011; 23:796-800. [DOI: 10.1002/chir.20994] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
54
|
Murai K, Fukushima S, Nakamura A, Shimura M, Fujioka H. C3-Symmetric chiral trisimidazoline: the role of a third imidazoline and its application to the nitro Michael reaction and the α-amination of β-ketoesters. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
55
|
|
56
|
Azmat MU, Guo Y, Guo Y, Wang Y, Lu G. An easy and effective approach towards heterogeneous Pt/SiO2-cinchonidine catalyst system for enantioselective hydrogenation of ethyl pyruvate. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcata.2010.12.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
57
|
Stojanović S, Turner DA, Hadad CM, Badjić JD. Controlling dynamic stereoisomerism in transition-metal folded baskets. Chem Sci 2011. [DOI: 10.1039/c0sc00592d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
|
58
|
Sambasivan S, Kim SG, Choi SM, Rhee YM, Ahn KH. C3-Symmetric Cage-like Receptors: Chiral Discrimination of α-Chiral Amines in a Confined Space. Org Lett 2010; 12:4228-31. [DOI: 10.1021/ol1015527] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sunderraman Sambasivan
- Department of Chemistry and Center for Electro-Photo Behaviours in Advanced Molecular Systems, POSTECH, San 31, Hyoja-Dong, Pohang 790-784, Republic of Korea, and Department of Chemistry, College of Natural Science, Kyonggi University, San 96-4, Iui-Dong, Yeongtong-gu, Suwon 443-760, Republic of Korea
| | - Sung-Gon Kim
- Department of Chemistry and Center for Electro-Photo Behaviours in Advanced Molecular Systems, POSTECH, San 31, Hyoja-Dong, Pohang 790-784, Republic of Korea, and Department of Chemistry, College of Natural Science, Kyonggi University, San 96-4, Iui-Dong, Yeongtong-gu, Suwon 443-760, Republic of Korea
| | - Sun Mi Choi
- Department of Chemistry and Center for Electro-Photo Behaviours in Advanced Molecular Systems, POSTECH, San 31, Hyoja-Dong, Pohang 790-784, Republic of Korea, and Department of Chemistry, College of Natural Science, Kyonggi University, San 96-4, Iui-Dong, Yeongtong-gu, Suwon 443-760, Republic of Korea
| | - Young Min Rhee
- Department of Chemistry and Center for Electro-Photo Behaviours in Advanced Molecular Systems, POSTECH, San 31, Hyoja-Dong, Pohang 790-784, Republic of Korea, and Department of Chemistry, College of Natural Science, Kyonggi University, San 96-4, Iui-Dong, Yeongtong-gu, Suwon 443-760, Republic of Korea
| | - Kyo Han Ahn
- Department of Chemistry and Center for Electro-Photo Behaviours in Advanced Molecular Systems, POSTECH, San 31, Hyoja-Dong, Pohang 790-784, Republic of Korea, and Department of Chemistry, College of Natural Science, Kyonggi University, San 96-4, Iui-Dong, Yeongtong-gu, Suwon 443-760, Republic of Korea
| |
Collapse
|
59
|
|
60
|
Mishra AK, Verma S. Decanuclear Copper Framework Supported by a Tripodal Adenine Ligand. Inorg Chem 2010; 49:3691-3. [DOI: 10.1021/ic100254t] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ashutosh Kumar Mishra
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016 (UP), India
| | - Sandeep Verma
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016 (UP), India
| |
Collapse
|
61
|
Murai K, Fukushima S, Hayashi S, Takahara Y, Fujioka H. C3-Symmetric Chiral Trisimidazoline: Design and Application to Organocatalyst. Org Lett 2010; 12:964-6. [DOI: 10.1021/ol902958m] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kenichi Murai
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Shunsuke Fukushima
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Shoko Hayashi
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Yusuke Takahara
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| |
Collapse
|
62
|
Mba M, Prins LJ, Zonta C, Cametti M, Valkonen A, Rissanen K, Licini G. Ti(iv)-amino triphenolate complexes as effective catalysts for sulfoxidation. Dalton Trans 2010; 39:7384-92. [DOI: 10.1039/c0dt00228c] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
63
|
Carrilho RMB, Abreu AR, Petöcz G, Bayón JC, Moreno MJSM, Kollár L, Pereira MM. New Binaphthyl-basedC3-symmetric Chiral Hemilabile Monophosphite Ligands: Synthesis and Characterization of Their Platinum Complexes. CHEM LETT 2009. [DOI: 10.1246/cl.2009.844] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
64
|
Angiolini L, Benelli T, Giorgini L. Synthesis and chiroptical properties of chiral azoaromatic dendrimers with a C3-symmetrical core. Chirality 2009; 22:99-109. [PMID: 19387991 DOI: 10.1002/chir.20712] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
New chiral azoaromatic dendrimeric systems have been synthesized starting from 1,3,5-benzenetricarbonyl trichloride as the core molecule. The simultaneous presence of the (S)-3-hydroxy pyrrolidinyl ring as the optically active moiety and the azobenzene donor-acceptor conjugated system as the photochromic group with permanent dipole moment, makes these systems potentially interesting as materials for advanced applications in nanotechnologies. All the compounds obtained have been characterized with particular attention to the effects induced by changing the electron-withdrawing group in the chromophoric moiety and to their optical activity. A strong nonlinear enhancement of chiroptical properties related to the number of chiral units linked to the symmetrical core is observed in these derivatives, which indicates the presence of conformationally chiral substructures.
Collapse
Affiliation(s)
- Luigi Angiolini
- Dipartimento di Chimica Industriale e dei Materiali and INSTM UdR-Bologna, University of Bologna, 40136 Bologna, Italy.
| | | | | |
Collapse
|
65
|
|
66
|
Reetz MT, Guo H, Ma JA, Goddard R, Mynott RJ. Helical Triskelion Monophosphites as Ligands in Asymmetric Catalysis. J Am Chem Soc 2009; 131:4136-42. [DOI: 10.1021/ja809297a] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Manfred T. Reetz
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Hongchao Guo
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Jun-An Ma
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Richard Goddard
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Richard J. Mynott
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| |
Collapse
|
67
|
Trindle C, Altun Z. Circular dichroism of some high-symmetry chiral molecules: B3LYP and SAOP calculations. Theor Chem Acc 2008. [DOI: 10.1007/s00214-008-0494-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
68
|
Schneider N, Bellemin-Laponnaz S, Wadepohl H, Gade LH. A New Class of Modular Oxazoline-NHC Ligands and Their Coordination Chemistry with Platinum Metals. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800908] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
69
|
Sircoglou M, Bontemps S, Bouhadir G, Saffon N, Miqueu K, Gu W, Mercy M, Chen CH, Foxman BM, Maron L, Ozerov OV, Bourissou D. Group 10 and 11 Metal Boratranes (Ni, Pd, Pt, CuCl, AgCl, AuCl, and Au+) Derived from a Triphosphine−Borane. J Am Chem Soc 2008; 130:16729-38. [DOI: 10.1021/ja8070072] [Citation(s) in RCA: 203] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marie Sircoglou
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Sébastien Bontemps
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Ghenwa Bouhadir
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Nathalie Saffon
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Karinne Miqueu
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Weixing Gu
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Maxime Mercy
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Chun-Hsing Chen
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Bruce M. Foxman
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Laurent Maron
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Oleg V. Ozerov
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| | - Didier Bourissou
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR−CNRS 5069) and Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux UMR−CNRS 5254, Equipe “Chimie−Physique”, Hélioparc, 2 Avenue du Président Angot, 64053 Pau Cedex 09, France, Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454,
| |
Collapse
|
70
|
Guarise C, Zaupa G, Prins LJ, Scrimin P. Functionalization of Tripodal Scaffold Molecules on Solid Support. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800259] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
71
|
Masu H, Katagiri K, Kato T, Kagechika H, Tominaga M, Azumaya I. Chiral Spherical Molecule Constructed from Aromatic Amides: Facile Synthesis and Highly Ordered Network Structure in the Crystal. J Org Chem 2008; 73:5143-6. [DOI: 10.1021/jo800585h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hyuma Masu
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan, and School of Biomedical Science, Tokyo Medical and Dental University, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Kosuke Katagiri
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan, and School of Biomedical Science, Tokyo Medical and Dental University, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Takako Kato
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan, and School of Biomedical Science, Tokyo Medical and Dental University, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Hiroyuki Kagechika
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan, and School of Biomedical Science, Tokyo Medical and Dental University, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Masahide Tominaga
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan, and School of Biomedical Science, Tokyo Medical and Dental University, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Isao Azumaya
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan, and School of Biomedical Science, Tokyo Medical and Dental University, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| |
Collapse
|
72
|
Kuberski B, Pecul M, Szumna A. A Chiral “Frozen” Hydrogen Bonding inC4-Symmetric Inherently Chiral Resorcin[4]arenes: NMR, X-ray, Circular Dichroism, and Theoretical Study. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800247] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
73
|
Gade L, Bellemin-Laponnaz S. Exploiting Threefold Symmetry in Asymmetric Catalysis: The Case of Tris(oxazolinyl)ethanes (“Trisox”). Chemistry 2008; 14:4142-52. [DOI: 10.1002/chem.200701990] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
74
|
Pintér Á, Haberhauer G. Oxazole Cyclopeptides for Chirality Transfer inC3-Symmetric Octahedral Metal Complexes. European J Org Chem 2008. [DOI: 10.1002/ejoc.200701153] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
75
|
|
76
|
Bontemps S, Bouhadir G, Gu W, Mercy M, Chen CH, Foxman BM, Maron L, Ozerov OV, Bourissou D. Metallaboratranes derived from a triphosphanyl-borane: intrinsic C3 symmetry supported by a Z-type ligand. Angew Chem Int Ed Engl 2008; 47:1481-4. [PMID: 18188861 DOI: 10.1002/anie.200705024] [Citation(s) in RCA: 150] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sébastien Bontemps
- Université Paul Sabatier, Laboratoire Hétérochimie Fondamentale et Appliquée UMR-CNRS 5069, 118 route de Narbonne, 31062 Toulouse cedex 9, France
| | | | | | | | | | | | | | | | | |
Collapse
|
77
|
|
78
|
Bontemps S, Bouhadir G, Gu W, Mercy M, Chen CH, Foxman B, Maron L, Ozerov O, Bourissou D. Metallaboratranes Derived from a Triphosphanyl–Borane: IntrinsicC3 Symmetry Supported by a Z-Type Ligand. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200705024] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
79
|
Suresh P, Srimurugan S, Babu B, Pati HN. Asymmetric sulfoxidation of prochiral sulfides using aminoalcohol derived chiral C3-symmetric trinuclear vanadium Schiff base complexes. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.11.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
80
|
Foltz C, Stecker B, Marconi G, Bellemin-Laponnaz S, Wadepohl H, Gade L. Stereochemical Consequences of Threefold Symmetry in Asymmetric Catalysis: Distorting C3 Chiral 1,1,1-Tris(oxazolinyl)ethanes (“Trisox”) in CuII Lewis Acid Catalysts. Chemistry 2007; 13:9912-23. [DOI: 10.1002/chem.200701085] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
81
|
(R,R,R)-Tris(2-hydroxy-1-methylethyl)- and (S,S,S)-tris(2-hydroxy-2-methylethyl)phosphine: water-soluble chiral trialkylphosphines with C3-symmetry. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.06.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
82
|
Foltz C, Enders M, Bellemin-Laponnaz S, Wadepohl H, Gade LH. Using a Tripod as a Chiral Chelating Ligand: Chemical Exchange Between Equivalent Molecular Structures in Palladium Catalysis with 1,1,1-Tris(oxazolinyl)ethane (“Trisox”). Chemistry 2007; 13:5994-6008. [PMID: 17525923 DOI: 10.1002/chem.200700307] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Threefold symmetrical chiral podands may simplify the stereochemistry of key catalytic intermediates for cases in which they only act as bidentate ligands. This applies to systems in which chemical exchange between the different kappa2-coordinated forms takes place and in which the non-coordinated sidearm may play a direct or indirect role at some earlier or later stage in the catalytic cycle. Palladium(II)-catalysed allylic substitutions provide appropriate test reactions along these lines. A series of neutral dichloropalladium(II) complexes, [PdCl2(iPr-trisox)] (1a), [PdCl2(Ph-trisox)] (1b), [PdCl2(Bn-trisox)] (1c) and [PdCl2(Ind-trisox)] (1d) (trisox=1,1,1-tris(oxazolinyl)ethane) were synthesised by reaction of the respective trisox derivative with [PdCl2(PhCN)2] and characterised inter alia by 15N NMR spectroscopy. Direct detection of the heteronuclei without isotope enrichment and with "normal" sample concentrations was achieved with the aid of a cryogenically cooled NMR probe on a 600 MHz NMR spectrometer. Whereas the 15N nuclei of the coordinated oxazoline rings resonate at delta=160-167 ppm and appear as two singlets due to their diastereotopicity, the signal assigned to the dangling oxazoline "arm" is observed at delta=238-240 ppm. Variable-temperature NMR studies along with a systematic series of magnetisation transfer experiments established exchange between ligating and non-ligating oxazoline rings. Reaction of [Pd(allyl)(cod)]BF4 (cod=cyclooctadiene) with Ph-trisox in CH(2)Cl(2) gave the corresponding allyl complex 2, for which fast exchange between the three oxazoline heterocycles as well as between the exo and endo diastereomers was observed along with a very slow eta3-eta1-eta3 process of the allyl fragment (magnetisation transfer). Palladium(0) complexes were prepared by reaction of trisox derivatives or sidearm-functionalised BOX (BOX=bis(oxazolinyl)dimethylmethane) ligands with [Pd(nbd)(alkene)] (nbd=norbornadiene, alkene=maleic anhydride or tetracyanoethylene). X-ray diffraction studies of the iPr-trisox and Ph-trisox complexes (3a and 3b) established Y-shaped trigonal planar coordination geometries with the trisox ligand coordinated in a bidentate fashion, whilst the pi-coordinated maleic anhydride ligand adopts one of the two possible diastereotopic orientations. As the catalytic test reaction, the allylic alkylation of 1,3-diphenylprop-2-enyl acetate substrate with dimethyl malonate as nucleophile (in the presence of N,O-bis(trimethylsilyl)acetamide) was investigated for the trisox derivatives, their BOX analogues, and a series of less symmetric "sidearm" functionalised bisoxazolines. The trisoxazoline-based catalysts generally induce a better enantioselectivity compared to their bisoxazoline analogues and display significant reduction of the induction period as well as rate enhancement.
Collapse
Affiliation(s)
- Carole Foltz
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | | | | | | | | |
Collapse
|
83
|
Gade LH, Marconi G, Dro C, Ward BD, Poyatos M, Bellemin-Laponnaz S, Wadepohl H, Sorace L, Poneti G. Shaping and Enforcing Coordination Spheres: The Implications ofC3 andC1 Chirality in the Coordination Chemistry of 1,1,1-Tris(oxazolinyl)ethane (“Trisox”). Chemistry 2007; 13:3058-75. [PMID: 17300108 DOI: 10.1002/chem.200601651] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A key feature of tris(oxazolinyl)ethane ("trisox") ligands, which have shown broad scope in asymmetric catalysis, is the orientation and steric demand of their oxazoline substituents. This, along with the modularity of their synthesis determines their coordination chemistry. The possibility to combine oxazolines, in which the stereogenic centers adjacent to the N-donor atoms have different absolute configuration, whilst retaining their ability to coordinate as tripodal ligands, has been demonstrated by the synthesis of the enantiomerically pure C3-symmetric iPr-trisox(S,S,S) and C1-symmetric iPr-trisox(S,S,R) and their reaction with [Mo(CO)3(NCMe)3] yielding [Mo{iPr-trisox(S,S,S)}(CO)3] (1 a) and [Mo{iPr-trisox(S,S,R)}(CO)3] (1 b), respectively. The non-autocomplementarity of two homochiral trisox ligands at one metal center has been demonstrated by reaction of rac-C3 iPr-trisox with one equivalent of [Co(ClO4)2].6 H2O, giving the centrosymmetric heterochiral complex [Co(iPr-trisox)2](ClO4)2 (3), whereas an analogous reaction with the enantiopure ligand yielded a mixture of Co(II) complexes, which is characterized by the total absence of a [(trisox)2Co](+/2+) ion. The scope of the trisox ligand in terms of facial coordination to both early and late transition metals was demonstrated by the synthesis and structural characterization of the mononuclear complexes [ScCl3(iPr-trisox)] (4), [Fe(tBu-trisox)(NCMe)3](BF4)2 (5), and [Ru(eta6-p-cymene)(iPr-trisox)](PF6)2 (6). The facial coordination of their three ligating atoms to a metal center may be impeded if the transition-metal center stereoelectronically strongly favors a non-deltahedral coordination sphere, which is generally the case for the heavier d8-transition-metal atoms/ions. Reaction of iPr-trisox with [Rh(cod)2]BF4 led to the formation of the 16-electron d8-configured complex [Rh(iPr-trisox)(cod)](BF4) (7), which is oxidized by CsBr3 to give the Rh(III) complex [RhBr3(iPr-trisox)] (8) possessing a C3-symmetric structure with a kappa3-N-trisox ligand. The crystalline salts [M2(mu-Cl3)(iPr-trisox)2](PF6) (M=Fe(II): 9, Co(II): 10, Ni(II): 11), were prepared by addition of one molar equivalent of iPr-trisox and an excess of KPF6 to solutions of the anhydrous (FeCl2) or hydrated metal halides (CoCl2.6 H2O, NiCl2.6 H2O). All dinuclear complexes display weak magnetic coupling. For the mononuclear species [CuCl2(iPr-trisox)] (12) the removal of a chloride anion and thus the generation of a dinuclear chloro-bridged structure failed due to Jahn-Teller destabilization of a potential octahedral coordination sphere.
Collapse
Affiliation(s)
- Lutz H Gade
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | | | | | | | | | | | | | | | | |
Collapse
|
84
|
Axe P, Bull SD, Davidson MG, Gilfillan CJ, Jones MD, Robinson DEJE, Turner LE, Mitchell WL. Enantiopure Pseudo-C3-Symmetric Titanium Alkoxide with Propeller-Like Chirality. Org Lett 2006; 9:223-6. [PMID: 17217270 DOI: 10.1021/ol062655w] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An enantiopure amine tris(phenolate) ligand containing a single stereogenic center has been used to control the propeller-like chirality of a derived pseudo-C3-symmetric titanium isopropoxide complex with excellent levels of diastereocontrol. [structure: see text].
Collapse
Affiliation(s)
- Philip Axe
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | | | | | | | | | | | | | | |
Collapse
|