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Imrich MR, Kraft J, Maichle-Mössmer C, Ziegler T. D-Fructose-based spiro-fused PHOX ligands: synthesis and application in enantioselective allylic alkylation. Beilstein J Org Chem 2018; 14:2082-2089. [PMID: 30202461 PMCID: PMC6122323 DOI: 10.3762/bjoc.14.182] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 06/22/2018] [Indexed: 01/19/2023] Open
Abstract
Phosphinooxazoline (PHOX) ligands are an important class of ligands in asymmetric catalysis. We synthesized ten novel D-fructose-derived spiro-fused PHOX ligands with different steric and electronic demand. The application of two of them was tested in asymmetric allylic alkylation. The ligands are prepared in two steps from readily available 1,2-O-isopropylidene protected β-D-fructopyranoses by the BF3·OEt2-promoted Ritter reaction with 2-bromobenzonitrile to construct the oxazoline moiety followed by Ullmann coupling of the resulting aryl bromides with diphenylphosphine. Both steps proceeded mostly in good to high yields (57–86% for the Ritter reaction and 35–89% for the Ullmann coupling). The Ritter reaction gave two anomers, which could be separated by column chromatography. The prepared ligands showed promising results (er of up to 84:16) in Tsuji–Trost reactions with diphenylallyl acetate as model substrate.
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Affiliation(s)
- Michael R Imrich
- Institute of Organic Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Jochen Kraft
- Institute of Organic Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Cäcilia Maichle-Mössmer
- Institute of Inorganic Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Thomas Ziegler
- Institute of Organic Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
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Zhang H, Wang H, Xu Q, Lu R, Cao Y, Wang Z, Tang P, Lin F, Li Y. Synthesis of oligo-fructopyranoside with difructopyranosyl N-phenyltrifluoroacetimidate donor. Carbohydr Res 2017; 448:6-9. [PMID: 28554124 DOI: 10.1016/j.carres.2017.05.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 05/09/2017] [Accepted: 05/15/2017] [Indexed: 10/19/2022]
Abstract
The hexa-fructopyranoside was synthesized with N-phenyltrifluoroacetimidate glycosylation. The synthesis was achieved by regioselective glycosylation on the 1-OH of fructopyranosyl acceptor. Fructosyl oligosaccharides were elongated with β-(2 → 1)-difructopyranosyl unit in every two steps, without any further protection/deprotection step. This work proved N-phenyltrifluoroacetimidate glycosylation a practical method for oligo-fructopyranoside synthesis.
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Affiliation(s)
- Hongliang Zhang
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China; State Key Laboratory of New Drugs & Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry, State Institute of Pharmaceutical Industry, 201203, China
| | - Hengtao Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
| | - Qiulong Xu
- State Key Laboratory of New Drugs & Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry, State Institute of Pharmaceutical Industry, 201203, China
| | - Rui Lu
- State Key Laboratory of New Drugs & Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry, State Institute of Pharmaceutical Industry, 201203, China
| | - Yunhua Cao
- State Key Laboratory of New Drugs & Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry, State Institute of Pharmaceutical Industry, 201203, China
| | - Zhefeng Wang
- State Key Laboratory of New Drugs & Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry, State Institute of Pharmaceutical Industry, 201203, China
| | - Pingping Tang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
| | - Feng Lin
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China; State Key Laboratory of New Drugs & Pharmaceutical Process, Shanghai Institute of Pharmaceutical Industry, State Institute of Pharmaceutical Industry, 201203, China; Honghui Medical Group, No. 6 Beijingxi Road, Nanjing, 210008, China.
| | - Yingxia Li
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China.
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Racine E, Burchak ON, Py S. Synthesis of α-Acyloxynitrones and Reactivity towards Samarium Diiodide. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600478] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Emilie Racine
- Univ. Grenoble Alpes; DCM; CNRS; DCM; 38000 Grenoble France
| | | | - Sandrine Py
- Univ. Grenoble Alpes; DCM; CNRS; DCM; 38000 Grenoble France
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Kraft J, Golkowski M, Ziegler T. Spiro-fused carbohydrate oxazoline ligands: Synthesis and application as enantio-discrimination agents in asymmetric allylic alkylation. Beilstein J Org Chem 2016; 12:166-71. [PMID: 26877819 PMCID: PMC4734355 DOI: 10.3762/bjoc.12.18] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 01/18/2016] [Indexed: 11/29/2022] Open
Abstract
In the present work, we describe a convenient synthesis of spiro-fused D-fructo- and D-psico-configurated oxazoline ligands and their application in asymmetric catalysis. The ligands were synthesized from readily available 3,4,5-tri-O-benzyl-1,2-O-isopropylidene-β-D-fructopyranose and 3,4,5-tri-O-benzyl-1,2-O-isopropylidene-β-D-psicopyranose, respectively. The latter compounds were partially deprotected under acidic conditions followed by condensation with thiocyanic acid to give an anomeric mixture of the corresponding 1,3-oxazolidine-2-thiones. The anomeric 1,3-oxazolidine-2-thiones were separated after successive benzylation, fully characterized and subjected to palladium catalyzed Suzuki–Miyaura coupling with 2-pyridineboronic acid N-phenyldiethanolamine ester to give the corresponding 2-pyridyl spiro-oxazoline (PyOx) ligands. The spiro-oxazoline ligands showed high asymmetric induction (up to 93% ee) when applied as chiral ligands in palladium-catalyzed allylic alkylation of 1,3-diphenylallyl acetate with dimethyl malonate. The D-fructo-PyOx ligand provided mainly the (R)-enantiomer while the D-psico-configurated ligand gave the (S)-enantiomer with a lower enantiomeric excess.
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Affiliation(s)
- Jochen Kraft
- Institute of Organic Chemistry, University of Tuebingen, Auf der Morgenstelle 18, 72076 Tuebingen, Germany
| | - Martin Golkowski
- Department of Pharmacology, University of Washington, 1959 NE Pacific St, Box 357280, Seattle, WA 98195, USA
| | - Thomas Ziegler
- Institute of Organic Chemistry, University of Tuebingen, Auf der Morgenstelle 18, 72076 Tuebingen, Germany
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Kraft J, Ziegler T. Synthesis of spirofused carbohydrate-oxazoline based palladium(II) complexes. Carbohydr Res 2015; 411:56-63. [PMID: 25974854 DOI: 10.1016/j.carres.2015.04.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Revised: 03/31/2015] [Accepted: 04/09/2015] [Indexed: 10/23/2022]
Abstract
Four carbohydrate-derived 2-pyridyl and 2-quinolinyl substituted spiro-oxazoline ligands were prepared from 3,4,5-tri-O-benzyl-1,2-di-O-isopropylidene-β-D-fructose in four steps. Conversion of the latter compound with trimethylsilylazide followed by hydrogenation gave an anomeric mixture of 2-amino-3,4,5-tri-O-benzyl-2-deoxy-1-O-trimethylsilyl-D-fructopyranose. Amide coupling of the fructosylamines with picolinic acid and quinaldic acid, respectively afforded the corresponding anomeric amidofructosides, which were both separated and characterized by NMR spectroscopy and X-ray crystallography. Cyclization of alpha-amides was achieved by treatment of the corresponding mesylates with NaH while beta-amides were directly cyclisized with NCS and Ph3P to give the corresponding 2-pyridyl (PyOx) and 2-quinolyl (QuinOx) substituted spiro-oxazoline ligands, respectively. The 2-pyridyl substituted spiro-oxazoline ligands PyOx formed stable complexes with Pd(II), which were fully characterized and their structure determined by X-ray crystallography, whereas the corresponding QuinOx ligands failed to form similar Pd complexes.
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Affiliation(s)
- Jochen Kraft
- Institute of Organic Chemistry, University of Tuebingen, Auf der Morgenstelle 18, 72076 Tuebingen, Germany
| | - Thomas Ziegler
- Institute of Organic Chemistry, University of Tuebingen, Auf der Morgenstelle 18, 72076 Tuebingen, Germany.
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Lin F, Lian G, Xu Q, Zhu X. Synthesis of β-d-fructopyranosides with N-phenyl trifluoroacetimidate donor. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.11.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Simao AC, Silva S, Rauter AP, Rollin P, Tatibouët A. Controlled Garegg Conditions for Selective Iodination on Pyranose Templates. European J Org Chem 2011. [DOI: 10.1002/ejoc.201001325] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Yokoyama Y, Inanaga J, Hanamoto T, Suzuki S, Furuno H, Shimizu K. Tandem Catalysis Strategy for Direct Glycosylation of 1-Hydroxy Sugars. Methoxyacetic Acid as an Effective Catalytic Mediator. HETEROCYCLES 2009. [DOI: 10.3987/com-08-s(d)74] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kaji E, Saiga R, Kurimoto E, Nishino T. Catalytic, Stereoselective Glycosylation - Spiroketalization of 3,4,5-Tri-O-benzyl-b-D-fructopyranose Generating Di-D-fructopyranose- 1,2’:2,1’-dianhydride. HETEROCYCLES 2006. [DOI: 10.3987/com-06-s(o)50] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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