101
|
Gold (III) phosphorus complex immobilized on fibrous nano-silica as a catalyst for the cyclization of propargylic amines with CO2. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2016.07.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
102
|
Xu H, Liu X, Cao C, Zhao B, Cheng P, He L. A Porous Metal-Organic Framework Assembled by [Cu 30] Nanocages: Serving as Recyclable Catalysts for CO 2 Fixation with Aziridines. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2016; 3:1600048. [PMID: 27980985 PMCID: PMC5111788 DOI: 10.1002/advs.201600048] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 03/31/2016] [Indexed: 05/26/2023]
Abstract
Based on a novel ligand 5-(2,6-bis(4-carboxyphenyl)pyridin-4-yl)isophthalic acid (H4BCP) with large skeletons, a unique porous framework {[Cu2(BCP)(H2O)2]·3DMF} n (1) assembled by nano-sized and censer-like [Cu30] cages is successfully obtained and structurally characterized. In 1, the large 1D channel in frameworks and window size in the nanocages can enrich methylene blue and capture CO2, exhibiting the promising applications in environmental protection. More importantly, the explorations on the cycloaddition reaction of CO2 and aziridines with various substituents suggest that 1 can serve as an efficient heterogeneous catalyst for CO2 conversion with aziridines in a solvent-free system, which can be reused at least ten times without any obvious loss in catalytic activity. This is the first example of metal-organic framework (MOF)-based catalysts in converting CO2 into high-value oxazolidinones through activating aziridines and CO2, further extending the applications of MOFs materials in catalysis.
Collapse
Affiliation(s)
- Hang Xu
- Department of ChemistryKey Laboratory of Advanced Energy Material ChemistryNankai UniversityTianjin300071China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)Tianjin300071China
| | - Xiao‐Fang Liu
- State Key Laboratory and Institute of Elemento‐Organic ChemistryNankai UniversityTianjin300071China
| | - Chun‐Shuai Cao
- Department of ChemistryKey Laboratory of Advanced Energy Material ChemistryNankai UniversityTianjin300071China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)Tianjin300071China
| | - Bin Zhao
- Department of ChemistryKey Laboratory of Advanced Energy Material ChemistryNankai UniversityTianjin300071China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)Tianjin300071China
| | - Peng Cheng
- Department of ChemistryKey Laboratory of Advanced Energy Material ChemistryNankai UniversityTianjin300071China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)Tianjin300071China
| | - Liang‐Nian He
- State Key Laboratory and Institute of Elemento‐Organic ChemistryNankai UniversityTianjin300071China
| |
Collapse
|
103
|
Sadeghzadeh SM. A green approach for the synthesis of 2-oxazolidinones using gold(I) complex immobilized on KCC-1 as nanocatalyst at room temperature. Appl Organomet Chem 2016. [DOI: 10.1002/aoc.3511] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
104
|
Avula K, Mohapatra DK. Ring-closing metathesis based total synthesis of ciliatamides A and B and their structural confirmation. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.03.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
105
|
García-Domínguez P, Fehr L, Rusconi G, Nevado C. Palladium-catalyzed incorporation of atmospheric CO 2: efficient synthesis of functionalized oxazolidinones. Chem Sci 2016; 7:3914-3918. [PMID: 30155036 PMCID: PMC6013789 DOI: 10.1039/c6sc00419a] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 03/03/2016] [Indexed: 01/04/2023] Open
Abstract
Methods to incorporate atmospheric CO2 into organic molecules are on demand. Here we present two Pd-catalyzed multicomponent reactions that provide functionalized oxazolidinones from propargylamines, aryl halides and CO2 as starting materials. These transformations, devoid of high CO2 pressures, represent a streamlined stereocontrolled synthesis of previously inaccessible versions of these useful heterocycles in an atom-economic manner, as up to four new single bonds are formed in a single synthetic operation.
Collapse
Affiliation(s)
| | - Lorenz Fehr
- Department of Chemistry , University of Zürich , Winterthurerstrasse 180 , CH-8057 , Switzerland .
| | - Giulia Rusconi
- Department of Chemistry , University of Zürich , Winterthurerstrasse 180 , CH-8057 , Switzerland .
| | - Cristina Nevado
- Department of Chemistry , University of Zürich , Winterthurerstrasse 180 , CH-8057 , Switzerland .
| |
Collapse
|
106
|
Saptal V, Shinde DB, Banerjee R, Bhanage BM. State-of-the-art catechol porphyrin COF catalyst for chemical fixation of carbon dioxide via cyclic carbonates and oxazolidinones. Catal Sci Technol 2016. [DOI: 10.1039/c6cy00362a] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly porous, crystalline catechol porphyrin COF was synthesized and applied as an organocatalyst for the fixation of carbon dioxide to synthesize value-added chemicals such as cyclic carbonates and oxazolidinones under solvent and transition-metal-free conditions.
Collapse
Affiliation(s)
- Vitthal Saptal
- Department of Chemistry
- Institute of Chemical Technology (Autonomous)
- Mumbai
- India
| | | | - Rahul Banerjee
- Physical/Materials Chemistry Division
- CSIR-National Chemical Laboratory
- Pune
- India
| | | |
Collapse
|
107
|
Kathalikkattil AC, Roshan R, Tharun J, Babu R, Jeong GS, Kim DW, Cho SJ, Park DW. A sustainable protocol for the facile synthesis of zinc-glutamate MOF: an efficient catalyst for room temperature CO2fixation reactions under wet conditions. Chem Commun (Camb) 2016; 52:280-3. [DOI: 10.1039/c5cc07781h] [Citation(s) in RCA: 119] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A water-stable zinc-glutamate-MOF catalyst, prepared using a facile and eco-friendly method at room temperature, was employed for room temperature wet CO2fixation reactions.
Collapse
Affiliation(s)
| | - Roshith Roshan
- School of Chemical and Biomolecular Engineering
- Pusan National University
- Busan 609-735
- Korea
| | - Jose Tharun
- School of Chemical and Biomolecular Engineering
- Pusan National University
- Busan 609-735
- Korea
| | - Robin Babu
- School of Chemical and Biomolecular Engineering
- Pusan National University
- Busan 609-735
- Korea
| | - Gyeong-Seon Jeong
- School of Chemical and Biomolecular Engineering
- Pusan National University
- Busan 609-735
- Korea
| | - Dong-Woo Kim
- Division of Ulsan Research Center for Green Fine Chemicals
- Korea Research Institute of Chemical Technology (KRICT)
- Ulsan 681-802
- Korea
| | - Sung June Cho
- Dept. of Chemical Engineering
- Chonnam National University
- Gwangju
- Korea
| | - Dae-Won Park
- School of Chemical and Biomolecular Engineering
- Pusan National University
- Busan 609-735
- Korea
| |
Collapse
|
108
|
Zhang J, Shao Y, Wang Y, Li H, Xu D, Wan X. Transition-metal-free decarboxylation of dimethyl malonate: an efficient construction of α-amino acid esters using TBAI/TBHP. Org Biomol Chem 2015; 13:3982-7. [PMID: 25722069 DOI: 10.1039/c5ob00109a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A transition-metal-free decarboxylation coupling process for the preparation of α-amino acid esters, which succeeded in merging hydrolysis/decarboxylation/nucleophilic substitution, is well described. This strategy uses commercially available inexpensive starting materials, catalysts and oxidants and has a wide substrate scope and operational simplicity.
Collapse
Affiliation(s)
- Jie Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Renai Road, 215123 Suzhou, China.
| | | | | | | | | | | |
Collapse
|
109
|
Kim JH, Kim SW, Jung MS, Ahn KH, Kang EJ. Regioselectivities in Fe(III)-catalyzed Cycloisomerization Reactions of γ-Allenyl Alcohols. B KOREAN CHEM SOC 2015. [DOI: 10.1002/bkcs.10581] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Jae Hyung Kim
- Department of Applied Chemistry; Kyung Hee University; Yongin 449-701 Korea
| | - Seung Wook Kim
- Department of Applied Chemistry; Kyung Hee University; Yongin 449-701 Korea
| | - Min Seok Jung
- Department of Applied Chemistry; Kyung Hee University; Yongin 449-701 Korea
| | - Kwang-Hyun Ahn
- Department of Applied Chemistry; Kyung Hee University; Yongin 449-701 Korea
| | - Eun Joo Kang
- Department of Applied Chemistry; Kyung Hee University; Yongin 449-701 Korea
| |
Collapse
|
110
|
Buba AE, Löwe H, Kunz H. Fluorenylmethoxycarbonyl-ProtectedO-Glycosyl-N-methyl Amino Acids: Building Blocks for the Synthesis of Conformationally Tuned Glycopeptide Antigens. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500929] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
111
|
Leggio A, Alò D, Belsito EL, Di Gioia ML, Romio E, Siciliano C, Liguori A. Lewis acid catalysed methylation ofN-(9H-fluoren-9-yl)methanesulfonyl (Fms) protected lipophilicα-amino acid methyl esters. J Pept Sci 2015; 21:644-50. [DOI: 10.1002/psc.2777] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 03/04/2015] [Accepted: 03/09/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Antonella Leggio
- Dipartimento di Farmacia e Scienze della Salute e della Nutrizione; Università della Calabria; Ed. Polifunzionale Rende CS I-87036 Italy
| | - Danila Alò
- Dipartimento di Farmacia e Scienze della Salute e della Nutrizione; Università della Calabria; Ed. Polifunzionale Rende CS I-87036 Italy
| | - Emilia Lucia Belsito
- Dipartimento di Farmacia e Scienze della Salute e della Nutrizione; Università della Calabria; Ed. Polifunzionale Rende CS I-87036 Italy
| | - Maria Luisa Di Gioia
- Dipartimento di Farmacia e Scienze della Salute e della Nutrizione; Università della Calabria; Ed. Polifunzionale Rende CS I-87036 Italy
| | - Emanuela Romio
- Dipartimento di Farmacia e Scienze della Salute e della Nutrizione; Università della Calabria; Ed. Polifunzionale Rende CS I-87036 Italy
| | - Carlo Siciliano
- Dipartimento di Farmacia e Scienze della Salute e della Nutrizione; Università della Calabria; Ed. Polifunzionale Rende CS I-87036 Italy
| | - Angelo Liguori
- Dipartimento di Farmacia e Scienze della Salute e della Nutrizione; Università della Calabria; Ed. Polifunzionale Rende CS I-87036 Italy
| |
Collapse
|
112
|
Etxabe J, Izquierdo J, Landa A, Oiarbide M, Palomo C. Catalytic Enantioselective Synthesis of N,Cα,Cα-Trisubstituted α-Amino Acid Derivatives Using 1H-Imidazol-4(5H)-ones as Key Templates. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201501275] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
113
|
Etxabe J, Izquierdo J, Landa A, Oiarbide M, Palomo C. Catalytic Enantioselective Synthesis of N,C(α),C(α)-Trisubstituted α-Amino Acid Derivatives Using 1H-Imidazol-4(5H)-ones as Key Templates. Angew Chem Int Ed Engl 2015; 54:6883-6. [PMID: 25907987 DOI: 10.1002/anie.201501275] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 03/24/2015] [Indexed: 11/06/2022]
Abstract
1H-Imidazol-4(5H)-ones are introduced as novel nucleophilic α-amino acid equivalents in asymmetric synthesis. These compounds not only allow highly efficient construction of tetrasubstituted stereogenic centers, but unlike hitherto known templates, provide direct access to N-substituted (alkyl, allyl, aryl) α-amino acid derivatives.
Collapse
Affiliation(s)
- Julen Etxabe
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018 San Sebastián (Spain)
| | - Joseba Izquierdo
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018 San Sebastián (Spain)
| | - Aitor Landa
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018 San Sebastián (Spain)
| | - Mikel Oiarbide
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018 San Sebastián (Spain)
| | - Claudio Palomo
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizabal 3, 20018 San Sebastián (Spain).
| |
Collapse
|
114
|
Hu J, Ma J, Zhu Q, Zhang Z, Wu C, Han B. Transformation of Atmospheric CO2Catalyzed by Protic Ionic Liquids: Efficient Synthesis of 2-Oxazolidinones. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411969] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
115
|
Hu J, Ma J, Zhu Q, Zhang Z, Wu C, Han B. Transformation of atmospheric CO2 catalyzed by protic ionic liquids: efficient synthesis of 2-oxazolidinones. Angew Chem Int Ed Engl 2015; 54:5399-403. [PMID: 25735887 DOI: 10.1002/anie.201411969] [Citation(s) in RCA: 155] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 02/08/2015] [Indexed: 11/06/2022]
Abstract
Protic ionic liquids (PILs), such as 1,8-diazabicyclo[5.4.0]-7-undecenium 2-methylimidazolide [DBUH][MIm], can catalyze the reaction of atmospheric CO2 with a broad range of propargylic amines to form the corresponding 2-oxazolidinones. The products are formed in high yields under mild, metal-free conditions. The cheaper and greener PILs can be easily recycled and reused at least five times without a decrease in the catalytic activity and selectivity. A reaction mechanism was proposed on the basis of a detailed DFT study which indicates that both the cation and anion of the PIL play key synergistic roles in accelerating the reaction.
Collapse
Affiliation(s)
- Jiayin Hu
- Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Colloid and Interface and Thermodynamics Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
| | | | | | | | | | | |
Collapse
|
116
|
Kandasamy YS, Cai J, Beler A, Sang MSJ, Andrews PD, Murphy RS. Photocontrol of ion permeation in lipid vesicles with amphiphilic dithienylethenes. Org Biomol Chem 2015; 13:2652-63. [DOI: 10.1039/c4ob02382j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Asymmetrical amphiphilic dithienylethenes have been prepared and photocontrol of ion permeation was observed in lipid vesicles.
Collapse
Affiliation(s)
- Yamuna S. Kandasamy
- Department of Chemistry and Biochemistry
- Research and Innovation Centre
- University of Regina
- Regina
- Canada
| | - Jianxin Cai
- Department of Chemistry and Biochemistry
- Research and Innovation Centre
- University of Regina
- Regina
- Canada
| | - Alisha Beler
- Department of Chemistry and Biochemistry
- Research and Innovation Centre
- University of Regina
- Regina
- Canada
| | - M.-S. Jemeli Sang
- Department of Chemistry and Biochemistry
- Research and Innovation Centre
- University of Regina
- Regina
- Canada
| | - Patrick D. Andrews
- Department of Chemistry and Biochemistry
- Research and Innovation Centre
- University of Regina
- Regina
- Canada
| | - R. Scott Murphy
- Department of Chemistry and Biochemistry
- Research and Innovation Centre
- University of Regina
- Regina
- Canada
| |
Collapse
|
117
|
Choi J, Ha HJ. Facile Synthesis of N-Methylated Amino Acids from Chiral Aziridine-2-carboxylate. B KOREAN CHEM SOC 2015. [DOI: 10.1002/bkcs.10048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jihye Choi
- Department of Chemistry; Hankuk University of Foreign Studies; Yongin 449-719 Korea
| | - Hyun-Joon Ha
- Department of Chemistry; Hankuk University of Foreign Studies; Yongin 449-719 Korea
| |
Collapse
|
118
|
Gazdik M, O'Neill MT, Lopaticki S, Lowes KN, Smith BJ, Cowman AF, Boddey JA, Sleebs BE. The effect of N-methylation on transition state mimetic inhibitors of the Plasmodium protease, plasmepsin V. MEDCHEMCOMM 2015. [DOI: 10.1039/c4md00409d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An N-methylation strategy has been applied to transition state mimetics that are potent inhibitors of plasmepsin V to improve their physical characteristics and their ability to reduce the viability of Plasmodium parasites in culture.
Collapse
Affiliation(s)
- Michelle Gazdik
- The Walter and Eliza Hall Institute of Medical Research
- Parkville
- Australia
- Department of Medical Biology
- The University of Melbourne
| | - Matthew T. O'Neill
- The Walter and Eliza Hall Institute of Medical Research
- Parkville
- Australia
- Department of Medical Biology
- The University of Melbourne
| | - Sash Lopaticki
- The Walter and Eliza Hall Institute of Medical Research
- Parkville
- Australia
- Department of Medical Biology
- The University of Melbourne
| | - Kym N. Lowes
- The Walter and Eliza Hall Institute of Medical Research
- Parkville
- Australia
- Department of Medical Biology
- The University of Melbourne
| | | | - Alan F. Cowman
- The Walter and Eliza Hall Institute of Medical Research
- Parkville
- Australia
- Department of Medical Biology
- The University of Melbourne
| | - Justin A. Boddey
- The Walter and Eliza Hall Institute of Medical Research
- Parkville
- Australia
- Department of Medical Biology
- The University of Melbourne
| | - Brad E. Sleebs
- The Walter and Eliza Hall Institute of Medical Research
- Parkville
- Australia
- Department of Medical Biology
- The University of Melbourne
| |
Collapse
|
119
|
Guyon C, Da Silva E, Lafon R, Métay E, Lemaire M. Reductive amination using a combination of CaH2 and noble metal. RSC Adv 2015. [DOI: 10.1039/c4ra14808h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Amines were prepared by a reductive amination reaction in the presence of calcium hydride and Pt/C.
Collapse
Affiliation(s)
- Carole Guyon
- Equipe Catalyse Synthèse Environnement
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
- UMR-CNRS 5246
- Université de Lyon
- Université Claude Bernard-Lyon 1
| | - Eric Da Silva
- Equipe Catalyse Synthèse Environnement
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
- UMR-CNRS 5246
- Université de Lyon
- Université Claude Bernard-Lyon 1
| | - Romain Lafon
- Equipe Catalyse Synthèse Environnement
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
- UMR-CNRS 5246
- Université de Lyon
- Université Claude Bernard-Lyon 1
| | - Estelle Métay
- Equipe Catalyse Synthèse Environnement
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
- UMR-CNRS 5246
- Université de Lyon
- Université Claude Bernard-Lyon 1
| | - Marc Lemaire
- Equipe Catalyse Synthèse Environnement
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
- UMR-CNRS 5246
- Université de Lyon
- Université Claude Bernard-Lyon 1
| |
Collapse
|
120
|
Reddy GR, Mukherjee D, Chittoory AK, Rajaram S. Unusual reactivity of nitronates with an aryl alkyl carbonate: synthesis of α-amino esters. Org Lett 2014; 16:5874-7. [PMID: 25372506 DOI: 10.1021/ol5028199] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The monoanions of nitroalkanes are ambident nucleophiles that react with carbonate electrophiles through the oxygen atom. Products arising from reactivity at the carbon atom will yield α-nitro esters, which are precursors for α-amino esters. We demonstrate this in the reactions of nitroalkanes with benzyl phenyl carbonate and DABCO where α-nitro esters are obtained instead of nitrile oxides. The products are readily reduced to α-amino esters. This pathway could be a safe alternative to the Strecker reaction.
Collapse
Affiliation(s)
- Golipalli Ramana Reddy
- New Chemistry Unit and ‡International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore 560064, India
| | | | | | | |
Collapse
|
121
|
Ren WM, Liu Y, Lu XB. Bifunctional Aluminum Catalyst for CO2 Fixation: Regioselective Ring Opening of Three-Membered Heterocyclic Compounds. J Org Chem 2014; 79:9771-7. [DOI: 10.1021/jo501926p] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Wei-Min Ren
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Ye Liu
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Xiao-Bing Lu
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| |
Collapse
|
122
|
Han J, Lian J, Tian X, Zhou S, Zhen X, Liu S. Total Synthesis of Micromide: a Marine Natural Product. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402977] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
123
|
Martins MAP, Frizzo CP, Tier AZ, Moreira DN, Zanatta N, Bonacorso HG. Update 1 of: Ionic Liquids in Heterocyclic Synthesis. Chem Rev 2014; 114:PR1-70. [DOI: 10.1021/cr500106x] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Marcos A. P. Martins
- Núcleo de Química
de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria-RS, Brazil
| | - Clarissa P. Frizzo
- Núcleo de Química
de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria-RS, Brazil
| | - Aniele Z. Tier
- Núcleo de Química
de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria-RS, Brazil
| | - Dayse N. Moreira
- Núcleo de Química
de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria-RS, Brazil
| | - Nilo Zanatta
- Núcleo de Química
de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria-RS, Brazil
| | - Helio G. Bonacorso
- Núcleo de Química
de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria-RS, Brazil
| |
Collapse
|
124
|
Hanessian S, Jennequin T, Boyer N, Babonneau V, Soma U, Mannoury la Cour C, Millan MJ, De Nanteuil G. Design, Synthesis, and Optimization of Balanced Dual NK1/NK3 Receptor Antagonists. ACS Med Chem Lett 2014; 5:550-5. [PMID: 24900878 DOI: 10.1021/ml400528y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2013] [Accepted: 02/08/2014] [Indexed: 01/08/2023] Open
Abstract
In connection with a program directed at potent and balanced dual NK1/NK3 receptor ligands, a focused exploration of an original class of peptidomimetic derivatives was performed. The rational design and molecular hybridization of a novel phenylalanine core series was achieved to maximize the in vitro affinity and antagonism at both human NK1 and NK3 receptors. This study led to the identification of a new potent dual NK1/NK3 antagonist with pK i values of 8.6 and 8.1, respectively.
Collapse
Affiliation(s)
- Stephen Hanessian
- Department of Chemistry, Université de Montréal, Station Centre-Ville, Montréal, Que. H3C 3J7, Canada
| | - Thomas Jennequin
- Department of Chemistry, Université de Montréal, Station Centre-Ville, Montréal, Que. H3C 3J7, Canada
| | - Nicolas Boyer
- Department of Chemistry, Université de Montréal, Station Centre-Ville, Montréal, Que. H3C 3J7, Canada
| | - Vincent Babonneau
- Department of Chemistry, Université de Montréal, Station Centre-Ville, Montréal, Que. H3C 3J7, Canada
| | - Udaykumar Soma
- Department of Chemistry, Université de Montréal, Station Centre-Ville, Montréal, Que. H3C 3J7, Canada
| | - Clotilde Mannoury la Cour
- Department of Psychopharmacology, Institut de Recherches Servier, 125 Chemin de Ronde, 78290 Croissy-sur-Seine, France
| | - Mark J. Millan
- Department of Psychopharmacology, Institut de Recherches Servier, 125 Chemin de Ronde, 78290 Croissy-sur-Seine, France
| | - Guillaume De Nanteuil
- Neuroscience Chemistry Research Unit, Institut de Recherches Servier, 125 Chemin de Ronde, 78290 Croissy-sur-Seine, France
| |
Collapse
|
125
|
Zhang W, Sun T, Ma Z, Li Y. Design, synthesis and biological evaluation of tasiamide analogues as tumor inhibitors. Mar Drugs 2014; 12:2308-25. [PMID: 24759000 PMCID: PMC4012464 DOI: 10.3390/md12042308] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Revised: 03/05/2014] [Accepted: 03/18/2014] [Indexed: 11/23/2022] Open
Abstract
Eighteen analogues of the marine cytotoxic linear peptide tasiamide were designed, synthesized and screened for their inhibitory activities against the growth of human nasopharyngeal carcinoma (KB) and human non-small cell lung tumor (A549) cell lines. The results indicated that minor modifications of the C-terminuswith aromatic groups were tolerated, with the IC50 values between 1.29 and 12.88 μM against these two cancer cell lines. Truncation, minor modifications at the N-terminus or elimination of the N-methyl groups in N-Me-d-Gln and/or N-Me-d-Phe residues resulted in inactive analogues.
Collapse
Affiliation(s)
- Wei Zhang
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203, China.
| | - Tiantian Sun
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203, China.
| | - Zhenhua Ma
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203, China.
| | - Yingxia Li
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203, China.
| |
Collapse
|
126
|
Siodłak D, Macedowska-Capiga A, Broda MA, Kozioł AE, Lis T. The cis-trans isomerization of N-methyl-α,β-dehydroamino acids. Biopolymers 2014. [PMID: 23203691 DOI: 10.1002/bip.22082] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Dehydroamino acids with the methylated N-terminal peptide group occur in natural small cyclic peptides. The structural analysis was used to investigate the cis-trans isomerization of the N-terminal tertiary amide group of diamides: Ac-(Z)-Δ(Me)Abu-NHMe (1), Ac-(Z)-Δ(Me)Phe-NHMe (2), Ac-(E)-Δ(Me)Phe-NHMe (3), Ac-Δ(Me)Ala-NHMe (4), and Ac-(Me)Ala-NHMe (5). The compounds were analyzed in the solid state by an X-ray crystallography (1-3), and in the solution by FTIR (MeCN and CHCl(3) ) and NMR (DMSO-d6 and CDCl(3) ) methods (1-5). In the solid state, the studied compounds adopt the cis configuration of N-terminal amide. In solution, this configuration also prevails for the dehydroamino acids 1-4, in contrast to the saturated analog 5. The results indicate that N-methyldehydroamino acids present a promising tool to induce the cis configuration of the amide bond.
Collapse
Affiliation(s)
- Dawid Siodłak
- Faculty of Chemistry, University of Opole, Oleska 48, Opole 45-052, Poland.
| | | | | | | | | |
Collapse
|
127
|
A convenient preparation of N ε-methyl-l-lysine derivatives and its application to the synthesis of histone tail peptides. Amino Acids 2014; 46:1305-11. [DOI: 10.1007/s00726-014-1690-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Accepted: 01/31/2014] [Indexed: 10/25/2022]
|
128
|
Szymanski W, Zwolinska M, Klossowski S, Młynarczuk-Biały I, Biały L, Issat T, Malejczyk J, Ostaszewski R. Synthesis of novel, peptidic kinase inhibitors with cytostatic/cytotoxic activity. Bioorg Med Chem 2014; 22:1773-81. [PMID: 24507826 DOI: 10.1016/j.bmc.2014.01.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 12/20/2013] [Accepted: 01/03/2014] [Indexed: 10/25/2022]
Abstract
The utility of a novel, chemoenzymatic procedure for the stereocontrolled synthesis of small peptides is presented in the preparation and structure optimisation of dipeptides with cytostatic/cytotoxic activity. The method uses Passerini multicomponent reaction for the preparation of racemic scaffold which is then enantioselectively hydrolysed by hydrolytic enzymes. Products of these transformations are further functionalised towards title compounds. Both activity and selectivity towards tumor cells is optimised. Final compound is shown to be an inhibitor of the protein kinase signaling pathway.
Collapse
Affiliation(s)
- Wiktor Szymanski
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Magdalena Zwolinska
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Szymon Klossowski
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Izabela Młynarczuk-Biały
- Department of Histology and Embryology, The Medical University of Warsaw, 5 Chalubinskiego Str., 02-004 Warsaw, Poland
| | - Lukasz Biały
- Department of Histology and Embryology, The Medical University of Warsaw, 5 Chalubinskiego Str., 02-004 Warsaw, Poland
| | - Tadeusz Issat
- Department of Immunology, The Medical university of Warsaw, 5 Chalubinskiego Str., 02-004 Warsaw, Poland
| | - Jacek Malejczyk
- Department of Histology and Embryology, The Medical University of Warsaw, 5 Chalubinskiego Str., 02-004 Warsaw, Poland
| | - Ryszard Ostaszewski
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| |
Collapse
|
129
|
Kumar S, Jain SL. Polyethylene Glycol Wrapped Potassium Bromide Assisted Chemical Fixation of Carbon Dioxide. Ind Eng Chem Res 2013. [DOI: 10.1021/ie4033439] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Subodh Kumar
- Chemical Sciences Division, CSIR-Indian Institute of Petroleum Mohkampur, Dehradun-248005, India
| | - Suman L. Jain
- Chemical Sciences Division, CSIR-Indian Institute of Petroleum Mohkampur, Dehradun-248005, India
| |
Collapse
|
130
|
Aslam NA, Babu SA, Sudha AJ, Yasuda M, Baba A. Chelation-controlled diastereoselective construction of N-aryl-, N-acyl/tosylhydrazono β-substituted aspartate derivatives via Barbier-type reaction. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.05.130] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
131
|
Zhang J, Jiang J, Li Y, Zhao Y, Wan X. A New Strategy for the Construction of α-Amino Acid Esters via Decarboxylation. Org Lett 2013; 15:3222-5. [DOI: 10.1021/ol401139m] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Jie Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Jiewen Jiang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Yuling Li
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Yun Zhao
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Xiaobing Wan
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, P. R. China
| |
Collapse
|
132
|
Buba AE, Koch S, Kunz H, Löwe H. Fluorenylmethoxycarbonyl-N-methylamino Acids Synthesized in a Flow Tube-in-Tube Reactor with a Liquid-Liquid Semipermeable Membrane. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300705] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
133
|
Danner P, Morkunas M, Maier ME. Synthesis of D-abrines by palladium-catalyzed reaction of ortho-iodoanilines with N-Boc-N-methylalanyl-substituted acetaldehyde and acetylene. Org Lett 2013; 15:2474-7. [PMID: 23631420 DOI: 10.1021/ol4009409] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A novel strategy to N-Boc-N-methyl--tryptophans (abrine derivatives) was developed that relies on the palladium-catalyzed annulation of ortho-iodoanilines 12 with either N-Boc-N-methyl-propargylglycine 16 or aldehyde 11. Both 11 and 16 can be prepared from d-serine. An alternative route to propargylglycine 16 utilizes an enantioselective propargylation reaction of glycine imine 17.
Collapse
Affiliation(s)
- Paulami Danner
- Institut für Organische Chemie, Universität Tübingen , Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | | | | |
Collapse
|
134
|
Zhao YN, Yang ZZ, Luo SH, He LN. Design of task-specific ionic liquids for catalytic conversion of CO2 with aziridines under mild conditions. Catal Today 2013. [DOI: 10.1016/j.cattod.2012.04.006] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
135
|
Lv Y, Zheng Y, Li Y, Xiong T, Zhang J, Liu Q, Zhang Q. Reductive amination of tertiary anilines and aldehydes. Chem Commun (Camb) 2013; 49:8866-8. [DOI: 10.1039/c3cc45084h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
136
|
Oerum S, Krabbe P, Schau-Magnussen M, Furbo S, Bendix J, Hammershøi A. Highly stereoselective, cobalt(iii)-directed Mannich additions in water yielding α-methylamino acid products. Dalton Trans 2013; 42:292-8. [DOI: 10.1039/c2dt32250a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
137
|
Zanuy D, Sayago FJ, Revilla-López G, Ballano G, Agemy L, Kotamraju VR, Jiménez AI, Cativiela C, Nussinov R, Sawvel AM, Stucky G, Ruoslahti E, Alemán C. Engineering strategy to improve peptide analogs: from structure-based computational design to tumor homing. J Comput Aided Mol Des 2013; 27:31-43. [PMID: 23239171 PMCID: PMC7553648 DOI: 10.1007/s10822-012-9623-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Accepted: 12/04/2012] [Indexed: 10/27/2022]
Abstract
We present a chemical strategy to engineer analogs of the tumor-homing peptide CREKA (Cys-Arg-Glu-Lys-Ala), which binds to fibrin and fibrin-associated clotted plasma proteins in tumor vessels (Simberg et al. in Proc Natl Acad Sci USA 104:932-936, 2007) with improved ability to inhibit tumor growth. Computer modeling using a combination of simulated annealing and molecular dynamics were carried out to design targeted replacements aimed at enhancing the stability of the bioactive conformation of CREKA. Because this conformation presents a pocket-like shape with the charged groups of Arg, Glu and Lys pointing outward, non-proteinogenic amino acids α-methyl and N-methyl derivatives of Arg, Glu and Lys were selected, rationally designed and incorporated into CREKA analogs. The stabilization of the bioactive conformation predicted by the modeling for the different CREKA analogs matched the tumor fluorescence results, with tumor accumulation increasing with stabilization. Here we report the modeling, synthetic procedures, and new biological assays used to test the efficacy and utility of the analogs. Combined, our results show how studies based on multi-disciplinary collaboration can converge and lead to useful biomedical advances.
Collapse
Affiliation(s)
- David Zanuy
- Department of Chemical Engineering, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
138
|
Bosc D, Mouray E, Grellier P, Cojean S, Loiseau PM, Dubois J. Introduction of methionine mimics on 3-arylthiophene: influence on protein farnesyltransferase inhibition and on antiparasitic activity. MEDCHEMCOMM 2013. [DOI: 10.1039/c3md00065f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
139
|
Chatterjee J, Rechenmacher F, Kessler H. N-methylation of peptides and proteins: an important element for modulating biological functions. Angew Chem Int Ed Engl 2012; 52:254-69. [PMID: 23161799 DOI: 10.1002/anie.201205674] [Citation(s) in RCA: 350] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Indexed: 11/06/2022]
Abstract
N-Methylation is one of the simplest chemical modifications often occurring in peptides and proteins of prokaryotes and higher eukaryotes. Over years of evolution, nature has employed N-methylation of peptides as an ingenious technique to modulate biological function, often as a mode of survival through the production of antibiotics. This small structural change can not only mobilize large protein complexes (as in the histone methylation), but also inhibits the action of enzymes by selective recognition of protein-protein interaction surfaces. In recent years through the advancement in synthetic approaches, the potential of N-methylation has begun to be revealed, not only in modulating biological activity and selectivity as well as pharmacokinetic properties of peptides, but also in delivering novel drugs. Herein, we summarize the current knowledge of the versatility of N-methylation in modulating biological, structural, and pharmacokinetic properties of peptides.
Collapse
Affiliation(s)
- Jayanta Chatterjee
- Genome biology unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | | | | |
Collapse
|
140
|
Chatterjee J, Rechenmacher F, Kessler H. N-Methylierung von Peptiden und Proteinen: ein wichtiges Element für die Regulation biologischer Funktionen. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205674] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
141
|
Aslam NA, Rajkumar V, Reddy C, Yasuda M, Baba A, Babu SA. Indium-Mediated Addition of γ-Substituted Allylic Halides to N-Aryl α-Imino Esters: Diastereoselective Production of β,β′-Disubstituted α-Amino Acid Derivatives with Two Contiguous Stereocenters. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200254] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
142
|
|
143
|
Jo KA, Maheswara M, Yoon E, Lee YY, Yun H, Kang EJ. N-Heterocyclic Carbene Catalyzed Domino Cyclization of Propargylic Alcohols and Benzoyl Isocyanates. J Org Chem 2012; 77:2924-8. [DOI: 10.1021/jo202102y] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kyoung A Jo
- Department of Applied Chemistry, Kyung Hee University, Yongin 446-701, Korea
| | | | - Eunyoung Yoon
- Department of Applied Chemistry, Kyung Hee University, Yongin 446-701, Korea
| | - Yun Yeong Lee
- Department of Applied Chemistry, Kyung Hee University, Yongin 446-701, Korea
| | - Hoseop Yun
- Division of Energy Systems Research
and Department of Chemistry, Ajou University, Suwon 443-749, Korea
| | - Eun Joo Kang
- Department of Applied Chemistry, Kyung Hee University, Yongin 446-701, Korea
| |
Collapse
|
144
|
High yielding synthesis of N-ethyl dehydroamino acids. Amino Acids 2012; 43:1643-52. [DOI: 10.1007/s00726-012-1240-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Accepted: 01/31/2012] [Indexed: 10/14/2022]
|
145
|
Watile RA, Bagal DB, Deshmukh KM, Dhake KP, Bhanage BM. Polymer supported diol functionalized ionic liquids: An efficient, heterogeneous and recyclable catalyst for 5-aryl-2-oxazolidinones synthesis from CO2 and aziridines under mild and solvent free condition. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcata.2011.10.007] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
146
|
De Marco R, Di Gioia ML, Liguori A, Perri F, Siciliano C, Spinella M. N-Alkylation of N-arylsulfonyl-α-amino acid methyl esters by trialkyloxonium tetrafluoroborates. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.10.042] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
147
|
Regioselective synthesis of 5-aryl-2-oxazolidinones from carbon dioxide and aziridines using Br−Ph3+PPEG600P+Ph3Br− as an efficient, homogenous recyclable catalyst at ambient conditions. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.09.056] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
148
|
Monteiro LS, Andrade JJ, Suárez AC. Synthesis of New N-Ethyl Dehydroamino Acid Derivatives: N-Ethyl β,β-Dibromo, N-Ethyl β-Bromo β-Substituted, and N-Ethyl β,β-Disubstituted N-Protected Dehydroamino Acid Methyl Esters. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100907] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
149
|
Dou XY, He LN, Yang ZZ. Proline-Catalyzed Synthesis of 5-Aryl-2-oxazolidinones from Carbon Dioxide and Aziridines Under Solvent-Free Conditions. SYNTHETIC COMMUN 2011. [DOI: 10.1080/00397911.2010.521903] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Xiao-Yong Dou
- a State Key Laboratory and Institute of Elemento-Organic Chemistry , Nankai University , Tianjin , China
| | - Liang-Nian He
- a State Key Laboratory and Institute of Elemento-Organic Chemistry , Nankai University , Tianjin , China
| | - Zhen-Zhen Yang
- a State Key Laboratory and Institute of Elemento-Organic Chemistry , Nankai University , Tianjin , China
| |
Collapse
|
150
|
Ho J, Coote ML, Easton CJ. Validation of the distal effect of electron-withdrawing groups on the stability of peptide enolates and its exploitation in the controlled stereochemical inversion of amino acid derivatives. J Org Chem 2011; 76:5907-14. [PMID: 21714508 DOI: 10.1021/jo200994z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Theoretical studies had predicted that N-electron-withdrawing substituents, hydrogen bonding, and protonation at amide nitrogen selectively increase the acidity of a distal proton adjacent to the amide carbonyl to the extent that the α-carbonyl acidity of some N-substituted amides exceeds that of typical ketones. Now, in the present work, competitive, base-catalyzed hydrogen-deuterium exchange experiments, with diisopropyl ketone and a series of N-substituted acetamides and diketopiperazines, have established that there is a strong correlation between the calculated acidities and the experimental rates of deprotonation in these systems. The results show that the rates of exchange of the distal protons of N-acylated and N-sulfonylated amides are more than 4 orders of magnitude faster than those of the N-methylated analogues and that the acylated and sulfonylated amides are much more reactive in this regard than diisopropyl ketone. The magnitude and regioselectivity of the distal effect is sufficient for practical applications and has been exploited in the manipulation of N-acetyl α,α'-disubstituted diketopiperazines for the controlled α-deuteration and stereochemical inversion of N-methylamino acids, and in the production of α-deuterated (2R,3S)-N-methylalloisoleucine from the nondeuterated (2S,3S)-isoleucine diastereomer.
Collapse
Affiliation(s)
- Junming Ho
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, Research School of Chemistry, Australian National University, Canberra ACT 0200, Australia
| | | | | |
Collapse
|