101
|
Pluta R, Li Z, Kumagai N, Shibasaki M. Z-Enolate Geometry in the Thioamide Aldol Reaction Illuminated by the 7-Azaindoline Auxiliary. Org Lett 2020; 22:791-794. [PMID: 31829612 DOI: 10.1021/acs.orglett.9b04120] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Z or E enolate geometry is the primary determinant of diastereoselectivity in the aldol reaction. Although amide and thioamide enolates are anticipated to have predominantly the E geometry because of the intrinsic steric demand, spectroscopic confirmation of the geometry in solution has remained elusive, particularly in the realm of highly stereoselective catalytic asymmetric aldol reactions. Herein we demonstrate that the 7-azaindoline auxiliary enables direct observation of the exclusive formation of the Z-enolate of the thioamide en route to a highly syn-selective aldol reaction.
Collapse
Affiliation(s)
- Roman Pluta
- Institute of Microbial Chemistry , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Zhao Li
- Institute of Microbial Chemistry , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Naoya Kumagai
- Institute of Microbial Chemistry , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| |
Collapse
|
102
|
Trost BM, Gnanamani E. Enantio- and Diastereoselective Double Mannich Reaction between Ketones and Imines Catalyzed by Zn-ProPhenol. Org Lett 2020; 22:1675-1680. [DOI: 10.1021/acs.orglett.0c00318] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Barry M. Trost
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Elumalai Gnanamani
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| |
Collapse
|
103
|
β-Isocupreidinate‒CaAl-layered double hydroxide composites—heterogenized catalysts for asymmetric Michael addition. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2019.110675] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
104
|
Lu H, Lv J, Zhou C, Kato T, Liu Y, Maruoka K. Practical Synthesis of High‐Performance Amino Tf‐Amide Organocatalysts for Asymmetric Aldol Reactions. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.201900730] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hanbin Lu
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 China
| | - Jiamin Lv
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 China
| | - Canhua Zhou
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 China
| | - Terumasa Kato
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 China
| | - Yan Liu
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 China
| | - Keiji Maruoka
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 China
- Graduate School of Pharmaceutical SciencesKyoto University Sakyo, Kyoto 606-8501 Japan
| |
Collapse
|
105
|
Leitch JA, Rossolini T, Rogova T, Maitland JAP, Dixon DJ. α-Amino Radicals via Photocatalytic Single-Electron Reduction of Imine Derivatives. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05011] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Jamie A. Leitch
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Thomas Rossolini
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Tatiana Rogova
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - J. Andrew P. Maitland
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Darren J. Dixon
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| |
Collapse
|
106
|
An F, Maji B, Min E, Ofial AR, Mayr H. Basicities and Nucleophilicities of Pyrrolidines and Imidazolidinones Used as Organocatalysts. J Am Chem Soc 2020; 142:1526-1547. [DOI: 10.1021/jacs.9b11877] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Feng An
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
| | - Biplab Maji
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
| | - Elizabeth Min
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
| | - Armin R. Ofial
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
| |
Collapse
|
107
|
Obaiah N, Bodke YD, Telkar S. Synthesis of 3‐[(1H‐Benzimidazol‐2‐ylsulfanyl)(aryl)methyl]‐4‐hydroxycoumarin Derivatives as Potent Bioactive Molecules. ChemistrySelect 2020. [DOI: 10.1002/slct.201903472] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Nagaraja Obaiah
- Department of P.G. Studies and Research in Industrial Chemistry, Jnana sahyadriKuvempu University, Shankaraghatta- 577451 Karnataka India
| | - Yadav D. Bodke
- Department of P.G. Studies and Research in Chemistry, Jnana sahyadriKuvempu University, Shankaraghatta- 577451 Karnataka India
| | - Sandeep Telkar
- Department of P.G. Studies and Research in Biotechnology and Bioinformatics, Jnana sahyadriKuvempu University, Shankaraghatta- 577 451 Karnataka India
| |
Collapse
|
108
|
Furuta T, Hamada S, Wang S, Murai T, Kawabata T, Xing Y, Inoue T, Ueda Y. Synthesis of Axially Chiral Binaphthothiophene δ-Amino Acid Derivatives Bearing Chalcogen Bonds. HETEROCYCLES 2020. [DOI: 10.3987/com-19-s(f)15] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
109
|
Yusran Y, Guan X, Li H, Fang Q, Qiu S. Postsynthetic functionalization of covalent organic frameworks. Natl Sci Rev 2020; 7:170-190. [PMID: 34692030 PMCID: PMC8288834 DOI: 10.1093/nsr/nwz122] [Citation(s) in RCA: 91] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 08/06/2019] [Accepted: 08/12/2019] [Indexed: 01/03/2023] Open
Abstract
Covalent organic frameworks (COFs) have been at the forefront of porous-material research in recent years. With predictable structural compositions and controllable functionalities, the structures and properties of COFs could be controlled to achieve targeted materials. On the other hand, the predesigned structure of COFs allows fruitful postsynthetic modifications to introduce new properties and functions. In this review, the postsynthetic functionalizations of COFs are discussed and their impacts towards structural qualities and performances are comparatively elaborated on. The functionalization involves the formation of specific interactions (covalent or coordination/ionic bonds) and chemical reactions (oxidation/reduction reaction) with pendant groups, skeleton and reactive linkages of COFs. The chemical stability and performance of COFs including catalytic activity, storage, sorption and opto-electronic properties might be enhanced by specific postsynthetic functionalization. The generality of these strategies in terms of chemical reactions and the range of suitable COFs places them as a pivotal role for the development of COF-based smart materials.
Collapse
Affiliation(s)
- Yusran Yusran
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Departement of Chemistry, Jilin University, Changchun 130012, China
| | - Xinyu Guan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Departement of Chemistry, Jilin University, Changchun 130012, China
| | - Hui Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Departement of Chemistry, Jilin University, Changchun 130012, China
| | - Qianrong Fang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Departement of Chemistry, Jilin University, Changchun 130012, China
| | - Shilun Qiu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Departement of Chemistry, Jilin University, Changchun 130012, China
| |
Collapse
|
110
|
Sui Y, Li X, Chang W, Wan H, Li W, Yang F, Yu ZZ. Multi-responsive nanocomposite membranes of cellulose nanocrystals and poly(N-isopropyl acrylamide) with tunable chiral nematic structures. Carbohydr Polym 2019; 232:115778. [PMID: 31952587 DOI: 10.1016/j.carbpol.2019.115778] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 12/21/2019] [Accepted: 12/23/2019] [Indexed: 01/03/2023]
Abstract
By imitating the unique structure of nature creatures, photonic membranes with periodic chiral helical structure can be assembled by cellulose nanocrystals (CNCs). It is still an issue to fabricate CNC photonic structures tunable in the entire visible spectrum with multiple stimuli-response capacities. Herein, a multi-responsive nanocomposite photonic membrane is fabricated by co-assembly of poly(N-isopropyl acrylamide) (PNIPAM) grafted CNCs with waterborne polyurethane (WPU) latex on the basis of the chiral nematic structure of CNCs, the thermo-responsibility of PNIPAM, and the flexibility of WPU. The flexible photonic membranes with uniform structural colors from blue to red are obtained by tuning the PNIPAM content. The membrane exhibits reversible responses to solvents, and iridescence changes in response to relative humidity with excellent repeatability. Interestingly, the membrane can be transparent or opaque depending on the ambient temperature. The photonic membranes are appealing in applications as humidity sensor, camouflage materials, and even smart windows.
Collapse
Affiliation(s)
- Yanqiu Sui
- State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Xiaofeng Li
- State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Wei Chang
- State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Hao Wan
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst 01003, United States
| | - Wei Li
- Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Fan Yang
- Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhong-Zhen Yu
- State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China.
| |
Collapse
|
111
|
Lu M, Li H, Zou C, Li J, Liu C, Sun M, Ma Y, Cheng R, Ye J. Primary amine catalyzed diastereo- and enantioselective Michael reaction of thiazolones and α,β-unsaturated ketones. Org Biomol Chem 2019; 17:9305-9312. [PMID: 31633136 DOI: 10.1039/c9ob02067e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The chiral primary amine catalyzed asymmetric Michael reaction of thiazolones and α,β-unsaturated ketones was reported. Two different optimal catalytic systems were obtained corresponding to cyclic and linear α,β-unsaturated ketones. By employing chiral primary amines as the catalysts and amino-acid derivatives as the additives, a variety of Michael adducts containing the scaffold of the thiazole ring were prepared in moderate to good yields and with excellent diastereo- and enantioselectivities (up to 95% yield, all up to >19/1 dr, up to 96% ee). The reaction was scaled up to obtain 1.73 grams of the Michael adduct with the maintenance of yield and stereoselectivity.
Collapse
Affiliation(s)
- Min Lu
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
| | | | | | | | | | | | | | | | | |
Collapse
|
112
|
Trost BM, Hung C(J, Mata G. Dinuclear Metal‐ProPhenol Catalysts: Development and Synthetic Applications. Angew Chem Int Ed Engl 2019; 59:4240-4261. [DOI: 10.1002/anie.201909692] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Barry M. Trost
- Department of ChemistryStanford University 333 Campus Drive Stanford CA 94305 USA
| | - Chao‐I (Joey) Hung
- Department of ChemistryStanford University 333 Campus Drive Stanford CA 94305 USA
| | - Guillaume Mata
- Department of ChemistryStanford University 333 Campus Drive Stanford CA 94305 USA
| |
Collapse
|
113
|
Dai J, Wang Z, Deng Y, Zhu L, Peng F, Lan Y, Shao Z. Enantiodivergence by minimal modification of an acyclic chiral secondary aminocatalyst. Nat Commun 2019; 10:5182. [PMID: 31729388 PMCID: PMC6858435 DOI: 10.1038/s41467-019-13183-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 10/28/2019] [Indexed: 12/21/2022] Open
Abstract
The development of enantiodivergent catalysis for the preparation of both enantiomers of a chiral compound is of importance in pharmaceutical and bioorganic chemistry. With the design of a class of reactive and stereoselective organocatalysts, acyclic chiral secondary amines, a method for achieving the enantiodivergence is developed simply by changing the secondary N-i-Bu- to N-Me-group within the catalyst architecture while maintaining the same absolute configuration of the catalysts, which modulates the catalyst conformation. This catalyst-controlled enantiodivergent method not only enables challenging asymmetric transformations to occur in an enantiodivergent manner but also features a high level of stereocontrol and broad scope that is demonstrated in eight different reactions (90 examples), all delivering both enantiomers of a range of structurally diverse products including hitherto less accessible, yet important, compounds in good yields with high stereoselectivities. Enantiodivergent methods, which to access both enantiomers of the same compound, are of importance in drug synthesis. Here, the authors show that by simply changing a NiBu- to a NMe-group in readily available amine organocatalysts, high stereocontrol and broad scope are achieved in eight asymmetric reactions.
Collapse
Affiliation(s)
- Jun Dai
- Key Laboratory of Medicinal Chemistry for Natural Resource, School of Chemical Science and Technology, and State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650091, Kunming, China
| | - Zhuang Wang
- Key Laboratory of Medicinal Chemistry for Natural Resource, School of Chemical Science and Technology, and State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650091, Kunming, China
| | - Yuhua Deng
- Key Laboratory of Medicinal Chemistry for Natural Resource, School of Chemical Science and Technology, and State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650091, Kunming, China
| | - Lei Zhu
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, 400030, Chongqing, China
| | - Fangzhi Peng
- Key Laboratory of Medicinal Chemistry for Natural Resource, School of Chemical Science and Technology, and State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650091, Kunming, China
| | - Yu Lan
- School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, 400030, Chongqing, China.
| | - Zhihui Shao
- Key Laboratory of Medicinal Chemistry for Natural Resource, School of Chemical Science and Technology, and State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650091, Kunming, China.
| |
Collapse
|
114
|
Kubyshkin V, Budisa N. The Alanine World Model for the Development of the Amino Acid Repertoire in Protein Biosynthesis. Int J Mol Sci 2019; 20:ijms20215507. [PMID: 31694194 PMCID: PMC6862034 DOI: 10.3390/ijms20215507] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 11/01/2019] [Accepted: 11/03/2019] [Indexed: 12/13/2022] Open
Abstract
A central question in the evolution of the modern translation machinery is the origin and chemical ethology of the amino acids prescribed by the genetic code. The RNA World hypothesis postulates that templated protein synthesis has emerged in the transition from RNA to the Protein World. The sequence of these events and principles behind the acquisition of amino acids to this process remain elusive. Here we describe a model for this process by following the scheme previously proposed by Hartman and Smith, which suggests gradual expansion of the coding space as GC–GCA–GCAU genetic code. We point out a correlation of this scheme with the hierarchy of the protein folding. The model follows the sequence of steps in the process of the amino acid recruitment and fits well with the co-evolution and coenzyme handle theories. While the starting set (GC-phase) was responsible for the nucleotide biosynthesis processes, in the second phase alanine-based amino acids (GCA-phase) were recruited from the core metabolism, thereby providing a standard secondary structure, the α-helix. In the final phase (GCAU-phase), the amino acids were appended to the already existing architecture, enabling tertiary fold and membrane interactions. The whole scheme indicates strongly that the choice for the alanine core was done at the GCA-phase, while glycine and proline remained rudiments from the GC-phase. We suggest that the Protein World should rather be considered the Alanine World, as it predominantly relies on the alanine as the core chemical scaffold.
Collapse
Affiliation(s)
- Vladimir Kubyshkin
- Department of Chemistry, University of Manitoba, Dysart Rd. 144, Winnipeg, MB R3T 2N2, Canada
- Correspondence: (V.K.); or (N.B.); Tel.: +1-204-474-9321 or +49-30-314-28821 (N.B.)
| | - Nediljko Budisa
- Department of Chemistry, University of Manitoba, Dysart Rd. 144, Winnipeg, MB R3T 2N2, Canada
- Department of Chemistry, Technical University of Berlin, Müller-Breslau-Str. 10, 10623 Berlin, Germany
- Correspondence: (V.K.); or (N.B.); Tel.: +1-204-474-9321 or +49-30-314-28821 (N.B.)
| |
Collapse
|
115
|
Li X, Zheng L, Li N, Chang H, Gao W, Wei W, Chen W. Catalyst‐Free and Selective Ring Openings of
N
‐Tosylaziridines: Good Approaches to β‐Amino Sulfones, β‐Bis(amino)thioethers, 1,2‐Azide Amines and 1,2‐Diamines. ChemistrySelect 2019. [DOI: 10.1002/slct.201902690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Xing Li
- Department of Biomedical EngineeringTaiyuan University of Technology 79 West Yingze Street Taiyuan 030024 People's Republic of China
| | - Leijie Zheng
- Department of Biomedical EngineeringTaiyuan University of Technology 79 West Yingze Street Taiyuan 030024 People's Republic of China
| | - Nana Li
- Department of Biomedical EngineeringTaiyuan University of Technology 79 West Yingze Street Taiyuan 030024 People's Republic of China
| | - Honghong Chang
- Department of Biomedical EngineeringTaiyuan University of Technology 79 West Yingze Street Taiyuan 030024 People's Republic of China
| | - Wenchao Gao
- Department of Biomedical EngineeringTaiyuan University of Technology 79 West Yingze Street Taiyuan 030024 People's Republic of China
| | - Wenlong Wei
- Department of Biomedical EngineeringTaiyuan University of Technology 79 West Yingze Street Taiyuan 030024 People's Republic of China
| | - Wenwen Chen
- School of Chemistry and Material ScienceShanxi Normal University Linfen 041004 China
| |
Collapse
|
116
|
An efficient and eco-friendly method for the thiol-Michael addition in aqueous solutions using amino acid ionic liquids (AAILs) as organocatalysts. PURE APPL CHEM 2019. [DOI: 10.1515/pac-2019-0212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A series of amino-acid based ionic liquids (Bmim[AA]s) have been synthesized and evaluated as catalysts, in aqueous solution. The results of a kinetic study of the thiol-Michael reaction of L-Cysteine with trans-β-nitrostyrene demonstrated the advantages of using (Bmim[AA]s) as organocatalysts. The benefits include high rate constants; mild reaction conditions; and, a reusable catalyst, which leads to a simple and efficient method for these important kinds of reactions.
Collapse
|
117
|
|
118
|
Insights into the role of zirconium in proline functionalized metal-organic frameworks attaining high enantio- and diastereoselectivity. J Catal 2019. [DOI: 10.1016/j.jcat.2019.07.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
119
|
Zhang Y, Ye W, Zhang H, Xiao X. A Novel Catalyst-Free Synthesis of 2,2-Diaryl Enamides from Stilbenes via a Nitrene Transfer Reaction. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900885] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yuanyuan Zhang
- Key Laboratory of Structure-Based Drug Design and Discovery; Ministry. of Education; Shenyang Pharmaceutical University; 110016 Shenyang PR China
| | - Wenjing Ye
- Key Laboratory of Structure-Based Drug Design and Discovery; Ministry. of Education; Shenyang Pharmaceutical University; 110016 Shenyang PR China
| | - Hui Zhang
- Key Laboratory of Structure-Based Drug Design and Discovery; Ministry. of Education; Shenyang Pharmaceutical University; 110016 Shenyang PR China
| | - Xiao Xiao
- Key Laboratory of Structure-Based Drug Design and Discovery; Ministry. of Education; Shenyang Pharmaceutical University; 110016 Shenyang PR China
- Department of Chemistry; Ministry. of Education; Temple University; 1901 N. 13 19122 Philadelphia PA USA
| |
Collapse
|
120
|
Li X, Zhao Y. Chiral Gating for Size- and Shape-Selective Asymmetric Catalysis. J Am Chem Soc 2019; 141:13749-13752. [PMID: 31368701 DOI: 10.1021/jacs.9b06619] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A poor or mediocre stereoselectivity is a key roadblock for a chiral catalyst to find practical adoptions. We report a facile method to create a tunable chiral space near a chiral catalyst to augment its selectivity. The space was created rationally through templated polymerization within cross-linked micelles, using readily available amino acid derivatives. It provided gated entrance of reactants to the catalyst, enabling a mediocre prolinamide to catalyze aldol condensation in water with excellent yields and ee, in a size- and shape-selective manner.
Collapse
Affiliation(s)
- Xiaowei Li
- Department of Chemistry , Iowa State University , Ames , Iowa 50011-3111 , United States
| | - Yan Zhao
- Department of Chemistry , Iowa State University , Ames , Iowa 50011-3111 , United States
| |
Collapse
|
121
|
Affiliation(s)
- Quan Cai
- Department of Chemistry and Research Center for Molecular Recognition and SynthesisFudan University, 220 Handan Rd Shanghai 200433 China
| |
Collapse
|
122
|
Wakamatsu H, Itoh M, Natori Y, Yoshimura Y. Synthesis of 2'-aminouridine derivatives as an organocatalyst for Diels-Alder reaction. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2019; 39:365-383. [PMID: 31361181 DOI: 10.1080/15257770.2019.1646917] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
To develop a novel asymmetric organocatalyst based on a ribonucleoside skeleton, we designed and synthesized 2'-aminouridine derivatives. The synthesized 2'-aminouridines having bulky substituents at both base and sugar moieties could catalyze the Diels-Alder reaction between cinnamaldehyde and cyclopentadiene. However, the optical purities of the resulting products were unexpectedly low.
Collapse
Affiliation(s)
- Hideaki Wakamatsu
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, 981-8558, Japan
| | - Moeko Itoh
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, 981-8558, Japan
| | - Yoshihiro Natori
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, 981-8558, Japan
| | - Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, 981-8558, Japan
| |
Collapse
|
123
|
Development of bifunctional organocatalysts and application to asymmetric total synthesis of naucleofficine I and II. Nat Commun 2019; 10:3394. [PMID: 31358765 PMCID: PMC6662887 DOI: 10.1038/s41467-019-11382-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 07/11/2019] [Indexed: 01/07/2023] Open
Abstract
The proline-type organocatalysts has been efficiently employed to catalyze a wide range of asymmetric transformations; however, there are still many synthetically useful and challenging transformations that remain unachievable in an asymmetric fashion. Herein, a chiral bifunctional organocatalyst with a spirocyclic pyrrolidine backbone-derived containing fluoro-alkyl and aryl sulfonamide functionalities, are designed, prepared, and examined in the asymmetric Mannich/acylation/Wittig reaction sequence of 3,4-dihydro-β-carboline with acetaldehyde, acyl halides, and Wittig reagents. As a result, the spirocyclic pyrrolidine trifluoromethanesulfonamide catalyst can facilitate this versatile sequence as demonstrated by 18 examples displaying excellent enantioselectivity (up to 94% ee), as well as moderate to good yields (up to 54% over 3 steps). As a practical application, the asymmetric total synthesis of naucleofficine I (1a) and II (1b) in ten steps have been accomplished. Natural products often contain complex N-fused polycyclic structures with multiple substituents and stereocentres. Here, the authors developed a bifunctional organocatalyst that is instrumental in obtaining such structures and applied it to the total synthesis of naucleofficine I and II in 6 steps.
Collapse
|
124
|
Rokhum L, Bez G. Recent Application of Polystyrene-supported Triphenylphosphine in Solid-Phase Organic Synthesis. CURR ORG CHEM 2019. [DOI: 10.2174/1385272822666181026115752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Recent years have witnessed a fast development of solid phase synthetic pathways, a variety of solid-supported reagent and its applications in diverse synthetic strategies and pharmaceutical applicability’s. Polymer-supported triphenylphosphine is getting a lot of applications owing to the speed and simplicity in the process. Furthermore, ease of recyclability and reuse of polymer-supported triphenylphosphine added its advantages. This review covers a wide range of useful organic transformations which are accomplished using cross-linked polystyrene-supported triphenylphosphine with the aim of giving renewed interest in the field of organic and medicinal-combinatorial chemistry.
Collapse
Affiliation(s)
- Lalthazuala Rokhum
- Department of Chemistry, National Institute of Technology, Silchar-788010, India
| | - Ghanashyam Bez
- Department of Chemistry, North Eastern Hill University, Shillong-793022, India
| |
Collapse
|
125
|
Dodda R, Samanta S, Su M, Zhao JCG. Synthesis of 1,2-Diamine Bifunctional Catalysts for the Direct Aldol Reaction Through Probing the Remote Amide Hydrogen. CURRENT ORGANOCATALYSIS 2019. [DOI: 10.2174/2213337206666190301155247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Background:
While proline can catalyze the asymmetric direct aldol reactions, its catalytic
activity and catalyst turnover are both low. To improve the catalytic efficiency, many prolinebased
organocatalysts have been developed. In this regard, prolinamide-based bifunctional catalysts
have been demonstrated by us and others to be highly efficient catalysts for the direct aldol reactions.
Results:
Using the β-acetamido- and β-tosylamidoprolinamide catalysts, the highly enantio- and diastereoselective
direct aldol reactions between enolizable ketones and aldehydes were achieved (up to
>99% ee, 98:2 dr). A low catalyst loading of only 2-5 mol % of the β-tosylamidoprolinamide catalyst
was needed to obtain the desired aldol products in good to high yields and high stereoselectivities.
Methods:
By carefully adjusting the hydrogen bonding ability of the remote β-amide hydrogen of the
1,2-diamine-based prolinamide bifunctional catalysts, the catalytic activity and the asymmetric induction
of these catalysts were significantly improved for the direct aldol reaction between aldehydes
and enolizable ketones.
Conclusion:
Some highly efficient 1,2-diamine-based bifunctional prolinamide catalysts have been
developed through probing the remote β-amide hydrogen for its hydrogen bonding capability. These
catalysts are easy to synthesize and high enantioselectivities may be achieved at very low catalyst
loadings.
Collapse
Affiliation(s)
- Rajasekhar Dodda
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| | - Sampak Samanta
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| | - Matthew Su
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| | - John Cong-Gui Zhao
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| |
Collapse
|
126
|
Abstract
Background:The continuous increase in challenges associated with the effective treatment of life threatening diseases influences the development of drug therapies with suitable physicochemical properties, efficiency and selectivity. So, organocatalysis is a potential synthetic tool which is accelerating the development of new drug molecules.Methods:Organocatalysis reactions can be carried out at lower temperatures and in milder pH conditions as compared to metal based catalysed reactions. Due to ready availability of catalysts, stability, purity, low toxicity and easy in handling of the chemical reactions, it has become an attractive technique to synthesise complex molecules with diverse structures. Here, the impact of various catalysts in organic synthesis with methods is discussed.Results:Organic catalysts are used widely in various chemical reactions such as Michael Addition, aldol reaction, Diels-Alder reactions and Knoevenagal reactions. It was observed that the use of organocatalyst results in the formation of stereo active molecules with diverse biological activities.Conclusion:This review also focuses on the various scopes and limitations of organocatalytic reactions in the production of medicinally useful drug molecules. Organocatalysts possess several advantages over traditional metal catalysts because they are non-toxic, readily available, stable, efficient, and easy to handle which involves environmentally friendly reaction.
Collapse
Affiliation(s)
- Biswa Mohan Sahoo
- Department of Pharmacy, Vikas Group of Institution, Nunna-521212, Vijayawada Rural, Andhra Pradesh, India
| | - Bimal Krishna Banik
- Department of Mathematics and Natural Sciences, College of Sciences and Human Studies, Deanship of Research, Prince Mohammad Bin Fahd University, Al Khobar, United States
| |
Collapse
|
127
|
Kotani S. Phosphine Oxide-Catalyzed Asymmetric Aldol Reactions and Double Aldol Reactions. Chem Pharm Bull (Tokyo) 2019; 67:519-526. [PMID: 31155556 DOI: 10.1248/cpb.c19-00015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Chiral phosphine oxides successfully catalyze asymmetric cross-aldol reactions of various carbonyl compounds in a highly enantioselective manner. The phosphine oxide catalysts coordinate to chlorosilanes to form chiral hypervalent silicon complexes in situ, which activate both aldol donors and acceptors, thus realizing cross-aldol reactions between a ketone and an aldehyde, between two aldehydes, between two ketones, and of 2,6-diketones. The use of phosphine oxide catalysis can be further extended to achieve the first catalytic enantioselective double aldol reactions, realizing one-pot stereoselective construction of up to four stereogenic centers.
Collapse
Affiliation(s)
- Shunsuke Kotani
- Priority Organization for Innovation and Excellence Kumamoto University.,Graduate School of Pharmaceutical Sciences, Kumamoto University
| |
Collapse
|
128
|
Maillard LT, Park HS, Kang YK. Organocatalytic Asymmetric Addition of Aldehyde to Nitroolefin by H-d-Pro-Pro-Glu-NH 2: A Mechanistic Study. ACS OMEGA 2019; 4:8862-8873. [PMID: 31459974 PMCID: PMC6648279 DOI: 10.1021/acsomega.9b00465] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 05/13/2019] [Indexed: 06/10/2023]
Abstract
The mechanism of the asymmetric addition of aldehyde (butanal) to nitroolefin (β-nitrostyrene) catalyzed by H-d-Pro-Pro-Glu-NH2 (dPPE-NH2; 1) was explored using density functional theory methods in chloroform. By conformational search, it was confirmed that catalyst 1 and its enamine intermediate adopted a dominant conformation with a βI structure stabilized by a C10 H-bond between the C=O of d-Pro1 and C-terminal NH2 proton and by an additional H-bond between the side chain and the backbone of Glu3. This βI turn structure was conserved all along the catalytic cycle. Consistently with the kinetic studies, the C-C bond formation between the enamine and electrophile was also confirmed as the rate-determining step. The stereoselectivity results from a re → re prochiral approach of enamine and β-nitrostyrene with a gauche- orientation of the double bonds. Although it was suggested as the possible formation of dihydrooxazine oxide species, this process was confirmed to be kinetically less accessible than the formation of acyclic nitronate. In particular, our calculated results supported that the carboxylic acid group of Glu3 in 1 played a central role by acting as general acid/base all along the catalytic cycle and orienting the asymmetric C-C bond formation.
Collapse
Affiliation(s)
- Ludovic T. Maillard
- Institut
des Biomolécules Max Mousseron, UMR CNRS-UM-ENSCM 5247, UFR des Sciences Pharmaceutiques
et Biologiques, 15 Avenue
Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Hae Sook Park
- Department
of Nursing, Cheju Halla University, Cheju 63092, Republic of Korea
| | - Young Kee Kang
- Department
of Chemistry, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
| |
Collapse
|
129
|
Affiliation(s)
| | - Deepa
- Department of ChemistryUniversity of Delhi Delhi 110007 India
| | - Surendra Singh
- Department of ChemistryUniversity of Delhi Delhi 110007 India
| |
Collapse
|
130
|
Dickson P, Kodadek T. Chemical composition of DNA-encoded libraries, past present and future. Org Biomol Chem 2019; 17:4676-4688. [PMID: 31017595 PMCID: PMC6520149 DOI: 10.1039/c9ob00581a] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
DNA-encoded libraries represent an exciting and powerful modality for high-throughput screening. In this article, we highlight recent important advances in this field and also suggest some important directions that would make the technology even more powerful.
Collapse
Affiliation(s)
- Paige Dickson
- Department of Chemistry, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA.
| | | |
Collapse
|
131
|
Aguesseau-Kondrotas J, Simon M, Legrand B, Bantigniès JL, Kang YK, Dumitrescu D, Van der Lee A, Campagne JM, de Figueiredo RM, Maillard LT. Prospect of Thiazole-based γ-Peptide Foldamers in Enamine Catalysis: Exploration of the Nitro-Michael Addition. Chemistry 2019; 25:7396-7401. [PMID: 30946485 DOI: 10.1002/chem.201901221] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Indexed: 12/18/2022]
Abstract
As three-dimensional folding is prerequisite to biopolymer activity, complex functions may also be achieved through foldamer science. Because of the diversity of sizes, shapes and folding available with synthetic monomers, foldamer frameworks enable a numerous opportunities for designing new generations of catalysts. We herein demonstrate that heterocyclic γ-peptide scaffolds represent a versatile platform for enamine catalysis. One central feature was to determine how the catalytic activity and the transfer of chiral information might be under the control of the conformational behaviours of the oligomer.
Collapse
Affiliation(s)
- Julie Aguesseau-Kondrotas
- Institut des Biomolécules Max Mousseron, UMR CNRS-UM-ENSCM 5247, UFR des Sciences Pharmaceutiques et Biologiques, 15 Avenue Charles Flahault, 34093, Montpellier Cedex 5, France
| | - Matthieu Simon
- Institut des Biomolécules Max Mousseron, UMR CNRS-UM-ENSCM 5247, UFR des Sciences Pharmaceutiques et Biologiques, 15 Avenue Charles Flahault, 34093, Montpellier Cedex 5, France
| | - Baptiste Legrand
- Institut des Biomolécules Max Mousseron, UMR CNRS-UM-ENSCM 5247, UFR des Sciences Pharmaceutiques et Biologiques, 15 Avenue Charles Flahault, 34093, Montpellier Cedex 5, France
| | | | - Young Kee Kang
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk, 28644, Korea
| | - Dan Dumitrescu
- XRD2 beamline, Elettra-Sincrotrone Trieste S.C.p.A., 34149, Basovizza, Trieste, Italy
| | - Arie Van der Lee
- Institut Européen des Membranes, UMR CNRS-UM-ENSCM 5635, Montpellier, France
| | - Jean-Marc Campagne
- Institut Charles Gerhardt Montpellier (ICGM), UMR 5253, UMR CNRS-UM-ENSCM, Montpellier, France
| | | | - Ludovic T Maillard
- Institut des Biomolécules Max Mousseron, UMR CNRS-UM-ENSCM 5247, UFR des Sciences Pharmaceutiques et Biologiques, 15 Avenue Charles Flahault, 34093, Montpellier Cedex 5, France
| |
Collapse
|
132
|
Xu EJ, Song Y, Wei ZL, Wang R, Duan HF, Lin YJ, Yang QB, Li YX. Novel chiral proline-based organocatalysts with amide and thiourea–amine units for highly efficient asymmetric aldol reaction in saturated brine without additives. CAN J CHEM 2019. [DOI: 10.1139/cjc-2018-0352] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A series of novel proline-based organocatalysts with amide and thiourea-amine units (7a–7f) were developed and evaluated in the asymmetric aldol reaction of 4-nitrobenzaldehyde with cyclohexanone. The organocatalyst (7c or 7d, 5 mol%) exhibited efficient catalytic activity to afford aldol products in high diastereoselectivity (up to >99:1), enantioselectivity (up to >99%), and yield (up to >96%) at 0 °C in saturated brine without adding an acid. Aldol products of benzaldehyde derivatives almost universally provide high diastereoselectivity and enantioselectivity.
Collapse
Affiliation(s)
- En-Jie Xu
- College of Chemistry, Jilin University, Changchun 130012, China
- College of Materials Science and Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
| | - Yan Song
- College of Materials Science and Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
| | - Zhong-Lin Wei
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Rui Wang
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Hai-Feng Duan
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Ying-Jie Lin
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Qing-Biao Yang
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Yao-Xian Li
- College of Chemistry, Jilin University, Changchun 130012, China
| |
Collapse
|
133
|
Liu X, Guo WX, Hu XL, Wang YY, Yue Q, Gao EQ. Chiral coordination frameworks constructed by a pyridine-based alanine derivative with semi-rigid and asymmetrical configuration: Structure, photocatalysis and selective luminescent sensing. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.02.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
134
|
Goryaeva MV, Kushch SO, Khudina OG, Burgart YV, Kudyakova YS, Ezhikova MA, Kodess MI, Slepukhin PA, Sadretdinova LS, Evstigneeva NP, Gerasimova NA, Saloutin VI. Autocatalyzed three-component cyclization of polyfluoroalkyl-3-oxo esters, methyl ketones and alkyl amines: a novel approach to 3-alkylamino-5-hydroxy-5-polyfluoroalkylcyclohex-2-en-1-ones. Org Biomol Chem 2019; 17:4273-4280. [PMID: 30938405 DOI: 10.1039/c9ob00293f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new one-pot reaction between polyfluoroalkylated 3-oxo esters, methyl ketones and primary or secondary alkyl amines is reported as an efficient approach to 3-alkylamino-5-hydroxy-5-polyfluoroalkylcyclohex-2-en-1-ones. The scope of three-component cyclization and its plausible mechanism are discussed. The described protocol makes it possible to vary the functional substituents in 2, 3 and 5 positions of carbocycles. Anhydrous conditions are necessary for the productive synthesis of aminocyclohexenones, whereas in the presence of water the competitive formation of alkyl ammonium salts of keto hydroxy carboxylates is observed. Dehydration of the aminocyclohexenones was effectively used for the synthesis of 3-alkylamino-5-trifluoromethylphenols, some of which exhibited moderate antifungal activities against eight pathogenic fungal strains.
Collapse
Affiliation(s)
- Marina V Goryaeva
- Postovsky Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences, S. Kovalevskoy St. 22, 620990 Ekaterinburg, Russia.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
135
|
Tsutsumi T, Karanjit S, Nakayama A, Namba K. A Concise Asymmetric Total Synthesis of (+)-Epilupinine. Org Lett 2019; 21:2620-2624. [PMID: 30963767 DOI: 10.1021/acs.orglett.9b00607] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Asymmetric total synthesis of (+)-epilupinine was achieved in just three steps using only commercially available common reagents. The total synthesis involved alkylations of N-nosylamide, ozone oxidation, and sequential reactions of the removal of the nosyl group, intramolecular dehydrative condensation, intramolecular Mannich reaction catalyzed by l-proline, and a reduction.
Collapse
Affiliation(s)
- Tomohiro Tsutsumi
- Graduate School of Pharmaceutical Science and Research Cluster on "Innovative Chemical Sensing" , Tokushima University , 1-78-1 Shomachi , Tokushima 770-8505 , Japan
| | - Sangita Karanjit
- Graduate School of Pharmaceutical Science and Research Cluster on "Innovative Chemical Sensing" , Tokushima University , 1-78-1 Shomachi , Tokushima 770-8505 , Japan
| | - Atsushi Nakayama
- Graduate School of Pharmaceutical Science and Research Cluster on "Innovative Chemical Sensing" , Tokushima University , 1-78-1 Shomachi , Tokushima 770-8505 , Japan
| | - Kosuke Namba
- Graduate School of Pharmaceutical Science and Research Cluster on "Innovative Chemical Sensing" , Tokushima University , 1-78-1 Shomachi , Tokushima 770-8505 , Japan
| |
Collapse
|
136
|
Guruge C, Rfaish SY, Byrd C, Yang S, Starrett AK, Guisbert E, Nesnas N. Caged Proline in Photoinitiated Organocatalysis. J Org Chem 2019; 84:5236-5244. [PMID: 30908906 DOI: 10.1021/acs.joc.9b00220] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Organocatalysis is an emerging field, in which small metal-free organic structures catalyze a diversity of reactions with a remarkable stereoselectivity. The ability to selectively switch on such pathways upon demand has proven to be a valuable tool in biological systems. Light as a trigger provides the ultimate spatial and temporal control of activation. However, there have been limited examples of phototriggered catalytic systems. Herein, we describe the synthesis and application of a caged proline system that can initiate organocatalysis upon irradiation. The caged proline was generated using the highly efficient 4-carboxy-5,7-dinitroindolinyl (CDNI) photocleavable protecting group in a four-step synthesis. Advantages of this system include water solubility, biocompatibility, high quantum yield for catalyst release, and responsiveness to two-photon excitation. We showed the light-triggered catalysis of a crossed aldol reaction, a Mannich reaction, and a self-aldol condensation reaction. We also demonstrated light-initiated catalysis, leading to the formation of a biocide in situ, which resulted in the growth inhibition of E. coli, with as little as 3 min of irradiation. This technique can be broadly applied to other systems, by which the formation of active forms of drugs can be catalytically assembled remotely via two-photon irradiation.
Collapse
Affiliation(s)
- Charitha Guruge
- Department of Biomedical and Chemical Engineering and Sciences , Florida Institute of Technology , Melbourne , Florida 32901 , United States
| | - Saad Y Rfaish
- Department of Biomedical and Chemical Engineering and Sciences , Florida Institute of Technology , Melbourne , Florida 32901 , United States
| | - Chanel Byrd
- Department of Biomedical and Chemical Engineering and Sciences , Florida Institute of Technology , Melbourne , Florida 32901 , United States
| | - Shukun Yang
- Department of Biomedical and Chemical Engineering and Sciences , Florida Institute of Technology , Melbourne , Florida 32901 , United States
| | - Anthony K Starrett
- Department of Biomedical and Chemical Engineering and Sciences , Florida Institute of Technology , Melbourne , Florida 32901 , United States
| | - Eric Guisbert
- Department of Biomedical and Chemical Engineering and Sciences , Florida Institute of Technology , Melbourne , Florida 32901 , United States
| | - Nasri Nesnas
- Department of Biomedical and Chemical Engineering and Sciences , Florida Institute of Technology , Melbourne , Florida 32901 , United States
| |
Collapse
|
137
|
Nießing S, Janiak C. Studies on catalytic activity of MIL-53(Al) and structure analogue DUT-5(Al) using bdc- and bpdc-ligands functionalized with l-proline in a solid-solution mixed-linker approach. MOLECULAR CATALYSIS 2019. [DOI: 10.1016/j.mcat.2019.01.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
138
|
Tavakol H, Ranjbari MA, Mahmoudi A. DFT study on the mechanistic details of the hydrolysis of dicyan using acetaldehyde as the first organocatalyst. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.03.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
139
|
Zhang Y, Sun J, Bai S, Zhao H, Wu X, Panezai H. Stability of Immobilization of Bipyridine‐proline on Zn‐Modified Bimodal Mesoporous Silicas and Recyclable Catalytic Performance in Asymmetric Aldol Reaction. ChemistrySelect 2019. [DOI: 10.1002/slct.201804000] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yajing Zhang
- Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical EngineeringBeijing University of Technology Beijing 100124, P.R. China
| | - Jihong Sun
- Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical EngineeringBeijing University of Technology Beijing 100124, P.R. China
| | - Shiyang Bai
- Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical EngineeringBeijing University of Technology Beijing 100124, P.R. China
| | - Hongwu Zhao
- College of Life Science and Bio-engineeringBeijing University of Technology Beijing 100124, P.R. China
| | - Xia Wu
- Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical EngineeringBeijing University of Technology Beijing 100124, P.R. China
| | - Hamida Panezai
- Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical EngineeringBeijing University of Technology Beijing 100124, P.R. China
| |
Collapse
|
140
|
Jette CI, Geibel I, Bachman S, Hayashi M, Sakurai S, Shimizu H, Morgan JB, Stoltz BM. Palladium-Catalyzed Construction of Quaternary Stereocenters by Enantioselective Arylation of γ-Lactams with Aryl Chlorides and Bromides. Angew Chem Int Ed Engl 2019; 58:4297-4301. [PMID: 30677201 DOI: 10.1002/anie.201814475] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 01/20/2019] [Indexed: 11/11/2022]
Abstract
Herein, we report the first Pd-catalyzed enantioselective arylation of α-substituted γ-lactams. Two sets of conditions were developed for this transformation, allowing for the use of either aryl chlorides or bromides as electrophiles. Utilizing a highly electron-rich dialkylphosphine ligand we have been able to construct α-quaternary centers in good yields (up to 91 % yield) and high enantioselectivities (up to 97 % ee).
Collapse
Affiliation(s)
- Carina I Jette
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd. MC 101-20, Pasadena, CA, 91125, USA
| | - Irina Geibel
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd. MC 101-20, Pasadena, CA, 91125, USA
| | - Shoshana Bachman
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd. MC 101-20, Pasadena, CA, 91125, USA
| | - Masaki Hayashi
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd. MC 101-20, Pasadena, CA, 91125, USA
| | - Shunya Sakurai
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd. MC 101-20, Pasadena, CA, 91125, USA
| | - Hideki Shimizu
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd. MC 101-20, Pasadena, CA, 91125, USA
| | - Jeremy B Morgan
- Dobo Hall, Department of Chemistry and Biochemistry, University of North Carolina, 601 S. College Rd., Wilmington, NC, 28403, USA
| | - Brian M Stoltz
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd. MC 101-20, Pasadena, CA, 91125, USA
| |
Collapse
|
141
|
Li Y, Zhang Z. Mechanism and stereoselectivity in NHC-catalyzed β-functionalization of saturated carboxylic ester. RSC Adv 2019; 9:7635-7644. [PMID: 35521168 PMCID: PMC9061211 DOI: 10.1039/c8ra10262g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 02/28/2019] [Indexed: 12/18/2022] Open
Abstract
To understand the mechanism and origin of the stereoselectivity of the [3 + 2] annulation reaction between a carboxylic ester and an isatin generating spirooxindole lactone catalyzed by N-heterocyclic carbene (NHC), density functional theory (DFT) calculations have been carried out. DFT results indicate that the catalytic cycle begins with the coupling of the catalyst with benzotriazole ester, followed by α-deprotonation to produce the enolate intermediate. The subsequent 1,4-proton transfer affords the homoenolate intermediate. The next crucial step is the stereoselective C-C bond formation. Then proton transfer takes place leading to the formation of the lactone intermediate. Finally, the elimination of the catalyst furnishes the final product. The presence of 1-hydroxybenzotriazole (HOBt) dramatically accelerates the proton transfer step. More importantly, HOBt has a non-negligible impact on stereoselective C-C bond formation, and the SR-configured product is the major stereoisomer of the annulation product, which is in good agreement with the experimental observations. The differential π⋯π stacking, C-H⋯π, lone pair (LP)⋯π and repulsion interactions are found to be responsible for the stereoselectivity. The obtained mechanistic insights should provide valuable information for understanding the important roles of the NHC catalyst and HOBt additive and be helpful for designing better NHC catalysts for this kind of reaction.
Collapse
Affiliation(s)
- Yan Li
- School of Chemical Engineering, University of Science and Technology Liaoning Anshan 114051 P. R. China +86-412-5929627 +86-18741219506
| | - Zhiqiang Zhang
- School of Chemical Engineering, University of Science and Technology Liaoning Anshan 114051 P. R. China +86-412-5929627 +86-18741219506
| |
Collapse
|
142
|
Sun J, Li Y, Gui Y, Xu Y, Zha Z, Wang Z. Copper(II)-catalyzed enantioselective conjugate addition of nitro esters to 2-enoyl-pyridine N-oxides. CHINESE CHEM LETT 2019. [DOI: 10.1016/j.cclet.2018.11.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
143
|
Ellebracht NC, Jones CW. Optimized Cellulose Nanocrystal Organocatalysts Outperform Silica-Supported Analogues: Cooperativity, Selectivity, and Bifunctionality in Acid–Base Aldol Condensation Reactions. ACS Catal 2019. [DOI: 10.1021/acscatal.8b05180] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Nathan C. Ellebracht
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0100, United States
| | - Christopher W. Jones
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0100, United States
| |
Collapse
|
144
|
Zhang Q, Jia X, Yin L. Catalytic asymmetric borylative aldol reaction of 5,6-dihydro-2H-pyran-2-one and ketones. Tetrahedron 2019. [DOI: 10.1016/j.tet.2018.11.041] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
145
|
Jette CI, Geibel I, Bachman S, Hayashi M, Sakurai S, Shimizu H, Morgan JB, Stoltz BM. Palladium‐Catalyzed Construction of Quaternary Stereocenters by Enantioselective Arylation of γ‐Lactams with Aryl Chlorides and Bromides. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814475] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Carina I. Jette
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering Division of Chemistry and Chemical Engineering California Institute of Technology 1200 E. California Blvd. MC 101-20 Pasadena CA 91125 USA
| | - Irina Geibel
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering Division of Chemistry and Chemical Engineering California Institute of Technology 1200 E. California Blvd. MC 101-20 Pasadena CA 91125 USA
| | - Shoshana Bachman
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering Division of Chemistry and Chemical Engineering California Institute of Technology 1200 E. California Blvd. MC 101-20 Pasadena CA 91125 USA
| | - Masaki Hayashi
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering Division of Chemistry and Chemical Engineering California Institute of Technology 1200 E. California Blvd. MC 101-20 Pasadena CA 91125 USA
| | - Shunya Sakurai
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering Division of Chemistry and Chemical Engineering California Institute of Technology 1200 E. California Blvd. MC 101-20 Pasadena CA 91125 USA
| | - Hideki Shimizu
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering Division of Chemistry and Chemical Engineering California Institute of Technology 1200 E. California Blvd. MC 101-20 Pasadena CA 91125 USA
| | - Jeremy B. Morgan
- Dobo Hall Department of Chemistry and Biochemistry University of North Carolina 601 S. College Rd. Wilmington NC 28403 USA
| | - Brian M. Stoltz
- Warren And Katharine Schlinger Laboratory for Chemistry and Chemical Engineering Division of Chemistry and Chemical Engineering California Institute of Technology 1200 E. California Blvd. MC 101-20 Pasadena CA 91125 USA
| |
Collapse
|
146
|
Cho H, Jeon H, Shin JE, Lee S, Park S, Kim S. Asymmetric Synthesis of Cα-Substituted Prolines through Curtin-Hammett-Controlled Diastereoselective N-Alkylation. Chemistry 2019; 25:2447-2451. [PMID: 30569571 DOI: 10.1002/chem.201804965] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Indexed: 11/09/2022]
Abstract
Asymmetric synthesis of α-substituted proline derivatives has been accomplished by an efficient chirality-transfer method. High diastereoselectivity of the N-alkylation of the proline ester (C→N chirality transfer) was achieved when a 2,3-disubstituted benzyl group was used as the N-substituent. DFT calculations provided a mechanistic rationale for the high degree of stereoselectivity. The generated N-chirality of the quaternary ammonium salt was transferred back to the α-carbon through a stereoselective [2,3]-Stevens rearrangement (N→C chirality transfer) to give α-substituted proline ester.
Collapse
Affiliation(s)
- Hyunkyung Cho
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Hongjun Jeon
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Jae Eui Shin
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Seokwoo Lee
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Soojun Park
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| |
Collapse
|
147
|
Padmaja VMD, Jangra S, Appayee C. Highly regioselective α-alkylation of α,β,γ,δ-unsaturated aldehydes. Org Biomol Chem 2019; 17:1714-1717. [PMID: 30209495 DOI: 10.1039/c8ob02059k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first α-alkylation of α,β,γ,δ-unsaturated aldehydes is achieved under mild reaction conditions. Several α,β,γ,δ-unsaturated aldehydes and diarylcarbinols are successfully tested for the synthesis of MBH-type α-alkylated products with an excellent regioselectivity. Simple pyrrolidine is efficiently used as a catalyst to achieve a perfect E/Z selectivity of the α-alkylated products.
Collapse
Affiliation(s)
- Venkata M D Padmaja
- Discipline of Chemistry, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat 382355, India.
| | | | | |
Collapse
|
148
|
Abstract
Enantioselective protonation, delivery of a proton to a carbanion intermediate, is the most straightforward and fundamental method for the preparation of a chiral tertiary carbon stereocenter. Recent efforts for this objective have been realized through enamine catalysis, which has now become a prominent catalytic strategy enabling a range of fascinating chiral transformations. This review will summarize recent advances in the field of enantioselective enamine protonation for the synthesis of optically active carbonyl compounds. Dynamic kinetic resolutions of α-substituted carbonyl compounds through enamine intermediates will be discussed as well.
Collapse
Affiliation(s)
- Niankai Fu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
| | | | | |
Collapse
|
149
|
Myers EL, Palte MJ, Raines RT. Catalysis of Hydrogen-Deuterium Exchange Reactions by 4-Substituted Proline Derivatives. J Org Chem 2019; 84:1247-1256. [PMID: 30602119 DOI: 10.1021/acs.joc.8b02644] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The identification and understanding of structure-activity relationships is vital for rational catalyst design. A kinetic study of the hydrogen-deuterium exchange reaction of cyclohexanone in aqueous solution, as catalyzed by proline derivatives, has revealed valuable structure-activity relationships. In phosphate-buffered solution, cis-4-fluoroproline is more active than the trans isomer, a distinction that appears to originate from a destabilizing interaction between the fluorine atom and phosphate anion during general acid-catalyzed dehydration of the carbinolamine intermediate. trans-4-Ammoniumprolines are exceptionally active catalysts owing to favorable Coulombic interactions involving the ammonium group and the alkoxide moiety formed upon 1,2-addition of the proline derivative to the ketone. These results could be used for the optimization of proline catalysts, especially in transformations where the formation of the putative iminium ion is rate-limiting.
Collapse
Affiliation(s)
- Eddie L Myers
- School of Chemistry , NUI Galway , University Road , Galway , Ireland
| | | | - Ronald T Raines
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| |
Collapse
|
150
|
New chiral morpholine-pyrrolidine ligands affecting asymmetric selectivity in copper catalyzed Henry reaction. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.01.048] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|