1
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So RC, Subramanian H, Kuehn CR, Sibi MP. Relay PHOS: Ligands with Fluxional Chirality in Asymmetric Palladium-Catalyzed Allylic Alkylation. Org Lett 2024. [PMID: 39158060 DOI: 10.1021/acs.orglett.4c02629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/20/2024]
Abstract
A modular route toward the synthesis of P,N ligands containing a fluxional group along the pyrazoline ring core is described. The racemic ligands were accessed in three steps from commercially available fluoroacetophenone in overall yields ranging from 18 to 76%. The enantiopure ligands were obtained using semi-preparative chiral high-performance liquid chromatography and chiral enantioselective phase-transfer catalysis. The effectiveness of the new ligands was assessed in palladium-catalyzed allylic alkylation with diphenylpropenyl acetate and dimethylpropenyl acetate. Under optimized conditions, diphenylpropenyl acetate underwent alkylation with dimethyl malonate in 98% yield and 94% ee. In general, the enantioselectivity for the product correlates with the size of the ligand fluxional group; the larger the fluxional group, the higher the selectivity.
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Affiliation(s)
- Regina C So
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Hariharaputhiran Subramanian
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Carter R Kuehn
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Mukund P Sibi
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
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2
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Qiang S, Hu R, Yeung Y. Zwitterion‐Catalyzed Ring‐Opening of Epoxides with Carboxylic Acids. ASIAN J ORG CHEM 2023. [DOI: 10.1002/ajoc.202200673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Shengsheng Qiang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong Shatin, NT Hong Kong P. R. China
| | - Rong‐Bin Hu
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong Shatin, NT Hong Kong P. R. China
| | - Ying‐Yeung Yeung
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong Shatin, NT Hong Kong P. R. China
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3
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Polydentate P, N-based ligands for palladium-catalyzed cross-coupling reactions. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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4
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Zhao QK, Wu X, Li LP, Yang F, Xie JH, Zhou QL. Asymmetric Hydrogenation of β-Aryl Alkylidene Malonate Esters: Installing an Ester Group Significantly Increases the Efficiency. Org Lett 2021; 23:1675-1680. [PMID: 33599130 DOI: 10.1021/acs.orglett.1c00093] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Herein, we report a practical method for efficient asymmetric hydrogenation of β-aryl alkylidene malonates. With a site-specifically tailored chiral spiro iridium catalyst, a series of β-aryl alkylidene malonate esters were hydrogenated to afford chiral malonate esters with good to excellent enantioselectivities (up to 99% ee) and high turnover numbers (up to 19000). The results showed that installing an ester group in α,β-unsaturated carboxylic esters significantly increased the efficiency of their asymmetric hydrogenation reactions.
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Affiliation(s)
- Qian-Kun Zhao
- State Key Laboratory and Institute of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xiong Wu
- State Key Laboratory and Institute of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Lin-Ping Li
- State Key Laboratory and Institute of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Fan Yang
- State Key Laboratory and Institute of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jian-Hua Xie
- State Key Laboratory and Institute of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Qi-Lin Zhou
- State Key Laboratory and Institute of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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5
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Müller M, Ganić A, Hörmann E, Kaiser S, Maywald M, Roseblade SJ, Schrems MG, Schumacher A, Woodmansee D, Pfaltz A. Optimized Scalable Synthesis of Chiral Iridium Pyridyl‐Phosphinite (Pyridophos) Catalysts. Helv Chim Acta 2020. [DOI: 10.1002/hlca.202000181] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Marc‐André Müller
- Department of Chemistry University of Basel St. Johanns-Ring 19 CH-4056 Basel Switzerland
| | - Adnan Ganić
- Department of Chemistry University of Basel St. Johanns-Ring 19 CH-4056 Basel Switzerland
| | - Esther Hörmann
- Department of Chemistry University of Basel St. Johanns-Ring 19 CH-4056 Basel Switzerland
| | - Stefan Kaiser
- Department of Chemistry University of Basel St. Johanns-Ring 19 CH-4056 Basel Switzerland
| | - Matthias Maywald
- Department of Chemistry University of Basel St. Johanns-Ring 19 CH-4056 Basel Switzerland
| | - Stephen J. Roseblade
- Department of Chemistry University of Basel St. Johanns-Ring 19 CH-4056 Basel Switzerland
| | - Marcus G. Schrems
- Department of Chemistry University of Basel St. Johanns-Ring 19 CH-4056 Basel Switzerland
| | - Andreas Schumacher
- Department of Chemistry University of Basel St. Johanns-Ring 19 CH-4056 Basel Switzerland
| | - David Woodmansee
- Department of Chemistry University of Basel St. Johanns-Ring 19 CH-4056 Basel Switzerland
| | - Andreas Pfaltz
- Department of Chemistry University of Basel St. Johanns-Ring 19 CH-4056 Basel Switzerland
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6
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Kmieciak A, Krzemiński MP. Chiral terpene auxiliaries V: Synthesis of new chiral γ-hydroxyphosphine oxides derived from α-pinene. Beilstein J Org Chem 2019; 15:2493-2499. [PMID: 31728163 PMCID: PMC6839555 DOI: 10.3762/bjoc.15.242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 10/09/2019] [Indexed: 11/25/2022] Open
Abstract
New chiral regioisomeric γ-hydroxyphosphine ligands were synthesized from α-pinene. The key transformation was the thermal [2,3]-sigmatropic rearrangement of allyldiphenylphosphinites, obtained from (1R,2R,4S,5R)-3-methyleneneoisoverbanol and (1R,2R,3R,5R)-4-methyleneneoisopinocampheol, to allylphosphine oxides. Hydroxy groups were introduced stereoselectively through a hydroboration–oxidation reaction proceeding from the less hindered site providing a trans relationship between the hydroxy and the phosphine substituents.
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Affiliation(s)
- Anna Kmieciak
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin St., 87-100 Toruń, Poland
| | - Marek P Krzemiński
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin St., 87-100 Toruń, Poland
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7
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Imrich MR, Maichle-Mössmer C, Ziegler T. d
-Fructose Based Spiro-Fused PHOX Ligands: Palladium Complexes and Application in Catalysis. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900490] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Michael R. Imrich
- Institute of Organic 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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8
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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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9
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Biosca M, Magre M, Coll M, Pàmies O, Diéguez M. Alternatives to Phosphinooxazoline (t-
BuPHOX) Ligands in the Metal-Catalyzed Hydrogenation of Minimally Functionalized Olefins and Cyclic β-Enamides. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700573] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Maria Biosca
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Campus Sescelades, C/ Marcel⋅lí Domingo, 1. 43007 Tarragona Spain
| | - Marc Magre
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Campus Sescelades, C/ Marcel⋅lí Domingo, 1. 43007 Tarragona Spain
| | - Mercè Coll
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Campus Sescelades, C/ Marcel⋅lí Domingo, 1. 43007 Tarragona Spain
| | - Oscar Pàmies
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Campus Sescelades, C/ Marcel⋅lí Domingo, 1. 43007 Tarragona Spain
| | - Montserrat Diéguez
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Campus Sescelades, C/ Marcel⋅lí Domingo, 1. 43007 Tarragona Spain
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10
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Meng K, Xia J, Wang Y, Zhang X, Yang G, Zhang W. Ir/BiphPHOX-catalyzed asymmetric hydrogenation of 3-substituted 2,5-dihydropyrroles and 2,5-dihydrothiophene 1,1-dioxides. Org Chem Front 2017. [DOI: 10.1039/c7qo00248c] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
An efficient asymmetric hydrogenation of 3-substituted 2,5-dihydropyrroles and 2,5-dihydrothiophene 1,1-dioxides was developed using an Ir catalyst with an axially flexible chiral phosphine-oxazoline ligand.
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Affiliation(s)
- Ke Meng
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- China
| | - Jingzhao Xia
- School of Pharmacy
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Yanzhao Wang
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Xinghua Zhang
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- China
| | - Guoqiang Yang
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Wanbin Zhang
- School of Pharmacy
- Shanghai Jiao Tong University
- Shanghai 200240
- China
- School of Chemistry and Chemical Engineering
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11
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Jayasundera KP, Engels TGW, Lun DJ, Mungalpara MN, Plieger PG, Rowlands GJ. The synthesis of planar chiral pseudo-gem aminophosphine pre-ligands based on [2.2]paracyclophane. Org Biomol Chem 2017; 15:8975-8984. [DOI: 10.1039/c7ob02393f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We have synthesized three pseudo-gem [2.2]paracyclophane-derived P,N-ligands and report preliminary activity studies for the amination of aryl bromides and chlorides.
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Affiliation(s)
| | - Tim G. W. Engels
- Institute of Fundamental Sciences
- Massey University
- Palmerston North
- New Zealand
- Fontys University of Applied Science
| | - David J. Lun
- Institute of Fundamental Sciences
- Massey University
- Palmerston North
- New Zealand
| | | | - Paul G. Plieger
- Institute of Fundamental Sciences
- Massey University
- Palmerston North
- New Zealand
| | - Gareth J. Rowlands
- Institute of Fundamental Sciences
- Massey University
- Palmerston North
- New Zealand
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