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Ray D, Majee S, Yadav RN, Banik BK. Asymmetric Reactions of N-Phosphonyl/Phosphoryl Imines. Molecules 2023; 28:molecules28083524. [PMID: 37110758 PMCID: PMC10143947 DOI: 10.3390/molecules28083524] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 04/12/2023] [Accepted: 04/14/2023] [Indexed: 04/29/2023] Open
Abstract
The asymmetric reactions of imines continued to attract the attention of the scientific community for decades. However, the stereoselective reactions of N-phosphonyl/phosphoryl imines remained less explored as compared to other N-substituted imines. The chiral auxiliary-based asymmetric-induction strategy with N-phosphonyl imines could effectively generate enantio- and diastereomeric amine, α,β-diamine, and other products through various reactions. On the other hand, the asymmetric approach for the generation of chirality through the utilization of optically active ligands, along with metal catalysts, could be successfully implemented on N-phosphonyl/phosphoryl imines to access numerous synthetically challenging chiral amine scaffolds. The current review critically summarizes and reveals the literature precedence of more than a decade to highlight the major achievements existing to date that can display a clear picture of advancement as well drawbacks in this area.
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Affiliation(s)
- Devalina Ray
- Amity Institute of Biotechnology, Amity University, Sector 125, Noida 201313, UP, India
- Amity Institute of Click Chemistry Research and Studies, Amity University, Sector 125, Noida 201313, UP, India
| | - Suman Majee
- Amity Institute of Biotechnology, Amity University, Sector 125, Noida 201313, UP, India
- Amity Institute of Click Chemistry Research and Studies, Amity University, Sector 125, Noida 201313, UP, India
| | - Ram Naresh Yadav
- Department of Chemistry, Faculty of Engineering and Technology, Veer Bahadur Singh Purvanchal University, Jaunpur 222003, UP, India
| | - Bimal Krishna Banik
- Department of Mathematics and Natural Sciences, College of Sciences and Human Studies, Prince Mohammad Bin Fahd University, Al Khobar 31952, Saudi Arabia
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2
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Zhang S, Liao JS, Unruh DK, Li G, Findlater M. Cobalt- and iron-catalyzed regiodivergent alkene hydrosilylations. Org Chem Front 2021. [DOI: 10.1039/d1qo00018g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Regiodivergent olefin hydrosilylation products are accessed through a simple change in the metal center. Linear products (anti-Markovnikov) are obtained using cobalt-based catalysts whereas branched (Markovnikov) products result from an iron-based analogue.
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Affiliation(s)
- Sheng Zhang
- Department of Chemistry & Biochemistry
- Texas Tech University
- Lubbock
- USA
| | - Jia-Shia Liao
- Department of Chemistry & Biochemistry
- Texas Tech University
- Lubbock
- USA
| | - Daniel K. Unruh
- Department of Chemistry & Biochemistry
- Texas Tech University
- Lubbock
- USA
| | - Guigen Li
- Department of Chemistry & Biochemistry
- Texas Tech University
- Lubbock
- USA
| | - Michael Findlater
- Department of Chemistry & Biochemistry
- Texas Tech University
- Lubbock
- USA
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3
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Zhang H, Yang B, Yang Z, Lu H, Li G. Asymmetric Synthesis of Chiral α-Methyl-α,β-diamino Acid Derivatives via Group-Assisted Purification Chemistry Using N-Phosphonyl Imines and a Ni(II)-Complexed Alanine Schiff Base. J Org Chem 2016; 81:7654-61. [DOI: 10.1021/acs.joc.6b01385] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Haowei Zhang
- Institute
of Chemistry and BioMedical Sciences, School of Chemistry and Chemical
Engineering, Nanjing University, Nanjing 210093, China
| | - Bing Yang
- Institute
of Chemistry and BioMedical Sciences, School of Chemistry and Chemical
Engineering, Nanjing University, Nanjing 210093, China
| | - Zhen Yang
- Institute
of Chemistry and BioMedical Sciences, School of Chemistry and Chemical
Engineering, Nanjing University, Nanjing 210093, China
| | - Hongjian Lu
- Institute
of Chemistry and BioMedical Sciences, School of Chemistry and Chemical
Engineering, Nanjing University, Nanjing 210093, China
| | - Guigen Li
- Institute
of Chemistry and BioMedical Sciences, School of Chemistry and Chemical
Engineering, Nanjing University, Nanjing 210093, China
- Department
of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
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4
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An G, Seifert C, Li G. N-Phosphonyl/phosphinyl imines and group-assisted purification (GAP) chemistry/technology. Org Biomol Chem 2015; 13:1600-17. [DOI: 10.1039/c4ob02254h] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Group-assisted purification (GAP) chemistry, which can provide various chiral amines and other functionalities without the use of column chromatography or recrystallization; products are consistently obtained with excellent stereocontrol.
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Affiliation(s)
- Guanghui An
- Institute of Chemistry & BioMedical Sciences
- Nanjing University
- Nanjing 210093
- P. R. China
- Department of Chemistry & Biochemistry
| | - Cole Seifert
- Institute of Chemistry & BioMedical Sciences
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Guigen Li
- Institute of Chemistry & BioMedical Sciences
- Nanjing University
- Nanjing 210093
- P. R. China
- Department of Chemistry & Biochemistry
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5
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Li G, An G, Seifert C, Sun H, Pan Y. Group-Assisted Purification (GAP) for Protection of Amino Acids Using N-Phosphonyl Functional Groups. HETEROCYCLES 2015. [DOI: 10.3987/com-14-s(k)25] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Sun H, Zhang H, Han J, Pan Y, Li G. Asymmetric C-C Bond Formation between Chiral N-Phosphonyl Imines and Ni(II)-Complex of Glycine Schiff Base Provides a GAP Synthesis of α,β- syn-Diamino Acid Derivatives. European J Org Chem 2013; 2013:4744-4747. [PMID: 25309122 PMCID: PMC4192728 DOI: 10.1002/ejoc.201300554] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Indexed: 11/12/2022]
Abstract
The GAP asymmetric synthesis of α,β-diamino acid derivatives has been achieved by reacting chiral N-phosphonyl imines with Ni(II)-complex of glycine ester-based enolate without the use of traditional purifications of chromatography and recrystallization. The successful control of synstereochemistry of vicinal diamino products complements our previous methods which afforded anti stereoisomers and enables all four individual isomers to be synthesized by simply changing enolate geometry. In contrast to our previous synthesis where required at least 5 equiv of glycine Schiff base enolate for complete conversion, the new synthesis only needs 1.1 equiv of glycine Schiff base enolate to give complete diastereoselectivity (>99% de) and yields (91% - 97%). The absolute stereochemistry has been unambiguously determined by X-ray structural analysis.
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Affiliation(s)
- Hao Sun
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
- Institute of Chemistry & BioMedical Sciences, Nanjing University, Nanjing 210093, P. R. China
| | - Haowei Zhang
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
- Institute of Chemistry & BioMedical Sciences, Nanjing University, Nanjing 210093, P. R. China
| | - Jianlin Han
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
- Institute of Chemistry & BioMedical Sciences, Nanjing University, Nanjing 210093, P. R. China
| | - Yi Pan
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
- Institute of Chemistry & BioMedical Sciences, Nanjing University, Nanjing 210093, P. R. China
| | - Guigen Li
- Institute of Chemistry & BioMedical Sciences, Nanjing University, Nanjing 210093, P. R. China
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
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Kattamuri PV, Xiong Y, Pan Y, Li G. N,N-DIIsopropyl-N-phosphonyl imines lead to efficient asymmetric synthesis of aziridine-2-carboxylic esters. Org Biomol Chem 2013; 11:3400-8. [PMID: 23563304 PMCID: PMC3653188 DOI: 10.1039/c3ob40251g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly diastereoselective asymmetric synthesis of chiral aziridine-2-carboxylic esters is reported for 20 examples with good yields (51-87%) and excellent diastereoselectivities (>99:1 dr for most cases). The modified N-phosphonyl imines have proven to be superior to previous imine auxiliaries for the aza Darzens reaction by using a secondary isopropyl group to replace the primary benzyl group for N,N-diamino protection. In the meanwhile, a special operation by slowly adding the pre-cooled imine solution at -78 °C into the preformed β-bromo lithium enolate mixture at this temperature in the presence of 4 Å molecular sieves was found to be crucial in terms of yields and diastereoselectivity. The present method can provide an easy and general access to β-hydroxy α-amino acids and other important amino building blocks.
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Affiliation(s)
- Padmanabha V. Kattamuri
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
| | - Yiwen Xiong
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Yi Pan
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Guigen Li
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
- Institute of Chemistry & BioMedical Sciences, Nanjing University, Nanjing 210093, P. R. China
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Shariatinia Z, Sohrabi M, Yousefi M, Koval T, Dusek M. Phosphoramidates: Synthesis, spectroscopy, and X-Ray crystallography. HETEROATOM CHEMISTRY 2012. [DOI: 10.1002/hc.21040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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10
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Li G, Tu SJ, Jiang B, Ma N, Wang XH. Microwave-Assisted Multicomponent Reaction in Water: Highly Stereoselective Synthesis of Pyrimidinespiroisoxazolo[5,4-b]pyridine Derivatives. HETEROCYCLES 2012. [DOI: 10.3987/com-11-s(p)53] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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Wang SL, Cheng C, Wu FY, Jiang B, Shi F, Tu SJ, Rajale T, Li G. Microwave-assisted multicomponent reaction in water leading to highly regioselective formation of benzo[f]azulen-1-ones. Tetrahedron 2011; 67:4485-4493. [PMID: 21731115 PMCID: PMC3124679 DOI: 10.1016/j.tet.2011.05.002] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Microwave-assisted three-component reaction has been established for the regioselective synthesis of benzo[f]azulen-1-ones. The reaction was performed in aqueous media under microwave irradiation by using readily available and inexpensive starting materials. A total of 38 examples were examined to show a broad substrate scope and good overall yields (70-89%). The present new synthesis shows attractive green chemistry characteristics, such as the use of water as reaction media, concise one-pot conditions, short reaction periods (7-24 min), easy work-up/purification and reduced waste production without the use of any strong acids or metal promoters.
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Affiliation(s)
- Shu-Liang Wang
- School of Chemistry and Chemical Engineering, Laboratory of Green Synthetic Chemistry for Functional Materials. Xuzhou Normal University; Xuzhou 221116, Jiangsu, P. R. China
| | - Chuang Cheng
- School of Chemistry and Chemical Engineering, Laboratory of Green Synthetic Chemistry for Functional Materials. Xuzhou Normal University; Xuzhou 221116, Jiangsu, P. R. China
| | - Fei-Yue Wu
- School of Chemistry and Chemical Engineering, Laboratory of Green Synthetic Chemistry for Functional Materials. Xuzhou Normal University; Xuzhou 221116, Jiangsu, P. R. China
| | - Bo Jiang
- School of Chemistry and Chemical Engineering, Laboratory of Green Synthetic Chemistry for Functional Materials. Xuzhou Normal University; Xuzhou 221116, Jiangsu, P. R. China
| | - Feng Shi
- School of Chemistry and Chemical Engineering, Laboratory of Green Synthetic Chemistry for Functional Materials. Xuzhou Normal University; Xuzhou 221116, Jiangsu, P. R. China
| | - Shu-Jiang Tu
- School of Chemistry and Chemical Engineering, Laboratory of Green Synthetic Chemistry for Functional Materials. Xuzhou Normal University; Xuzhou 221116, Jiangsu, P. R. China
| | - Trideep Rajale
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061
| | - Guigen Li
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061
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12
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Notar Francesco I, Egloff C, Wagner A, Colobert F. Stereoselective Addition of Grignard Reagents to New P-Chirogenic N-Phosphinoylbenzaldimines: Effect of the Phosphorus Substituents on the Stereoselectivity. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100380] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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Kattamuri PV, Ai T, Pindi S, Sun Y, Gu P, Shi M, Li G. Asymmetric synthesis of α-amino-1,3-dithianes via chiral N-phosphonyl imine-based Umpolung reaction without using chromatography and recrystallization. J Org Chem 2011; 76:2792-7. [PMID: 21405041 PMCID: PMC3074014 DOI: 10.1021/jo200070d] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A series of α-amino-1,3-dithianes have been synthesized via the asymmetric Umpolung reaction of 2-lithio-1,3-dithianes with chiral N-phosphonyl imines in good chemical yields (up to 82%) and good to excellent diastereoselectivities (>99:1). The manner by which chiral N-phosphonyl imines are slowly added into the solution of 2-lithio-1,3-dithiane was found to be crucial for achieving excellent diastereoselectivity. The current synthesis was proven to follow the GAP chemistry (group-assistant-purification chemistry) process, which avoids traditional purification techniques of chromatography or recrystallization, i.e., the pure chiral α-amino-1,3-dithianes attached with the chiral N-phosphonyl group were readily obtained by washing the solid crude products with hexane or a mixture of hexane-ethyl acetate.
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Affiliation(s)
| | - Teng Ai
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
| | - Suresh Pindi
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
| | - Yinwei Sun
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, P. R. China
| | - Peng Gu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, P. R. China
| | - Min Shi
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, P. R. China
| | - Guigen Li
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
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14
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Zhao QY, Yuan ZL, Shi M. Highly Diastereo- and Enantioselective Vinylogous Mannich Reactions of Fluorinated Aldimines with Siloxyfurans. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201000843] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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Jiang B, Wang X, Shi F, Tu SJ, Li G. New multicomponent cyclization: domino synthesis of pentasubstituted pyridines under solvent-free conditions. Org Biomol Chem 2011; 9:4025-8. [DOI: 10.1039/c0ob01258k] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Jiang B, Zhang G, Ma N, Shi F, Tu SJ, Kaur P, Li G. A new rapid multicomponent domino reaction for the formation of functionalized benzo[h]pyrazolo[3,4-b]quinolines. Org Biomol Chem 2011; 9:3834-8. [DOI: 10.1039/c1ob05034f] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Pindi S, Kaur P, Shakya G, Li G. N-Phosphinyl Imine Chemistry (I): Design and Synthesis of Novel N-Phosphinyl Imines and their Application to Asymmetric aza-Henry Reaction. Chem Biol Drug Des 2010; 77:20-9. [DOI: 10.1111/j.1747-0285.2010.01047.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Kaur P, Wever W, Rajale T, Li G. Asymmetric hydrophosphylation of chiral N-phosphonyl imines provides an efficient approach to chiral α-amino phosphonates. Chem Biol Drug Des 2010; 76:314-9. [PMID: 20887612 PMCID: PMC2951300 DOI: 10.1111/j.1747-0285.2010.01013.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Chiral N-phosphonylimines were found to react with lithium phosphites to provide various substituted chiral α-amino phosphonates in excellent yields (94-97%) and diastereoselectivities (93:7-99:1). The types of bases utilized for generating the nucleophile are crucial for the effectiveness of asymmetric induction. In addition, N,N-isopropyl group on chiral N-phosphonylimine auxilliary was proven to be superior to other protecting groups in controlling diastereoselectivity. The absolute configuration was unambiguously determined by converting a chiral α-amino phosphonate into its authentic N-Cbz derivative.
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Affiliation(s)
- Parminder Kaur
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA,
| | - Walter Wever
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA,
| | - Trideep Rajale
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA,
| | - Guigen Li
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA,
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Davis FA, Theddu N. Asymmetric synthesis of cyclic cis-beta-amino acid derivatives using sulfinimines and prochiral Weinreb amide enolates. J Org Chem 2010; 75:3814-20. [PMID: 20462208 DOI: 10.1021/jo100680b] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cyclic cis-beta-amino Weinreb amides, valuable building blocks for the asymmetric synthesis of cyclic beta-amino acids derivatives, are readily prepared via ring-closing metathesis of sulfinimine-derived N-sulfinyl beta-amino diene Weinreb amides. These unsaturated cyclic cis-beta-amino Weinreb amides are valuable building blocks for the asymmetric synthesis of cyclic beta-amino acid derivatives.
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Affiliation(s)
- Franklin A Davis
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, USA.
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Kaur P, Pindi S, Wever W, Rajale T, Li G. Asymmetric catalytic N-phosphonyl imine chemistry: the use of primary free amino acids and Et2AlCN for asymmetric catalytic Strecker reaction. J Org Chem 2010; 75:5144-50. [PMID: 20597482 PMCID: PMC2912979 DOI: 10.1021/jo100865q] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The new asymmetric catalytic Strecker reaction of achiral N-phosphonyl imines has been established. Excellent enantioselectivity (95.2-99.7% ee) and yields (89-97%) have been achieved by using primary free natural amino acids as catalysts and Et(2)AlCN as nucleophile. This work also presents the novel use of nonvolatile and inexpensive Et(2)AlCN in asymmetric catalysis. The N-phosphonyl protecting group enabled simple product purification to be achieved simply by washing the crude products with hexane, which is defined as the GAP chemistry (GAP: Group-Assistant-Purification). It can also be readily cleaved and recycled under mild condition to give a quantitative recovery of N,N'-bis(naphthalen-1-ylmethyl)ethane-1,2-diamine. A new mechanism was proposed for this reaction and was supported by experimental observations.
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Affiliation(s)
- Parminder Kaur
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
| | - Suresh Pindi
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
| | - Walter Wever
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
| | - Trideep Rajale
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
| | - Guigen Li
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
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Sun H, Rajale T, Pan Y, Li G. Chiral N-phosphoryl imines: design, synthesis and direct asymmetric addition reactions with diketones and diesters. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.06.072] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Chiral N-phosphonyl imine chemistry: asymmetric additions of glycine enolate to diphenyl diamine-based phosphonyl imines. Sci China Chem 2010. [DOI: 10.1007/s11426-010-0026-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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23
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Kaur P, Shakya G, Sun H, Pan Y, Li G. Chiral N-phosphonyl imine chemistry: an efficient asymmetric synthesis of chiral N-phosphonyl propargylamines. Org Biomol Chem 2010; 8:1091-6. [PMID: 20165799 DOI: 10.1039/b923914f] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A variety of substituted chiral propargylamines have been synthesized by reacting chiral N-phosphonylimines with lithium aryl/alkyl acetylides. Seventeen examples were studied to give excellent yields (>90%) and diastereoselectivities (96 : 4 to 99 : 1). It was found that the types of bases for generating acetylides and solvents are crucial for effectiveness of this asymmetric reaction. In addition, N,N-isopropyl group on chiral N-phosphonylimine auxiliary was proven to be superior to other protecting groups in controlling diastereoselectivity.
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Affiliation(s)
- Parminder Kaur
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
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24
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Ai T, Li G. Chiral N-phosphonyl imine chemistry: Asymmetric synthesis of α,β-diamino esters by reacting phosphonyl imines with glycine enolates. Bioorg Med Chem Lett 2009; 19:3967-9. [DOI: 10.1016/j.bmcl.2009.03.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2009] [Accepted: 03/02/2009] [Indexed: 11/30/2022]
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