1
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Hernández-Fernández J, Tiempos-Flores N, Ordóñez M, Rivas-Galindo V, López-Cortina S, García-Alvarez KG, Hernández-Fernández E. Microwave-Assisted Hydrolysis of Ethyl Azolylacetates and Cinnamates with K 2CO 3: Synthesis of Potassium Carboxylates. ACS OMEGA 2024; 9:40783-40789. [PMID: 39371973 PMCID: PMC11447747 DOI: 10.1021/acsomega.4c05596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Revised: 08/30/2024] [Accepted: 09/05/2024] [Indexed: 10/08/2024]
Abstract
In this study, the hydrolysis of ethyl azolylacetates and ethyl cinnamates using K2CO3/ethanol under microwave irradiation was developed. For this purpose, ethyl azolylacetates were first synthesized by nucleophilic substitution between the corresponding azole and ethyl bromoacetate under sonication at 50 °C for 3 h, yielding derivatives with 10-92% chemical yields, while ethyl cinnamates were obtained by a microwave-assisted Horner-Wadsworth-Emmons (HWE) reaction of triethyl phosphonoacetate with a variety of aryl aldehydes at 140 °C for 20 min, yielding derivatives with moderate to high yields (67-98%). Initially, the optimization of the hydrolysis reaction was performed using ethyl pyrazolylacetate as a model starting material while varying the temperature, time, and base equivalents; the best results were achieved by carrying out the reaction at 180 °C for 20 min with 3.0 eq of K2CO3. This simple and greener method facilitated the synthesis of potassium carboxylates in moderate to high yields, 80-98% for azolyl derivatives and 73-98% for cinnamate derivatives. The structures of all potassium carboxylates were confirmed by FTIR, 1H, 13C NMR, and HRMS.
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Affiliation(s)
- Jorge Hernández-Fernández
- Facultad
de Ciencias Químicas, Universidad
Autónoma de Nuevo León, Pedro de Alba s/n, Ciudad Universitaria, San
Nicolás de los Garza, Nuevo León 66455, México
| | - Norma Tiempos-Flores
- Facultad
de Ciencias Químicas, Universidad
Autónoma de Nuevo León, Pedro de Alba s/n, Ciudad Universitaria, San
Nicolás de los Garza, Nuevo León 66455, México
| | - Mario Ordóñez
- Centro
de Investigaciones Químicas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos 62209, México
| | - Verónica
M. Rivas-Galindo
- Facultad
de Medicina, Universidad Autónoma
de Nuevo León, Fco. I. Madero s/n, Mitras Centro, Monterrey, Nuevo León 64460, México
| | - Susana López-Cortina
- Facultad
de Ciencias Químicas, Universidad
Autónoma de Nuevo León, Pedro de Alba s/n, Ciudad Universitaria, San
Nicolás de los Garza, Nuevo León 66455, México
| | - Katia Guadalupe García-Alvarez
- Facultad
de Ciencias Químicas, Universidad
Autónoma de Nuevo León, Pedro de Alba s/n, Ciudad Universitaria, San
Nicolás de los Garza, Nuevo León 66455, México
| | - Eugenio Hernández-Fernández
- Facultad
de Ciencias Químicas, Universidad
Autónoma de Nuevo León, Pedro de Alba s/n, Ciudad Universitaria, San
Nicolás de los Garza, Nuevo León 66455, México
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2
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Shinde RS, Narnawre AR, Walke PM, Karade NN. (Diacetoxyiodo)benzene Mediated Oxidative Conversion of Erlenmeyer Azlactones to 2‐Substituted Oxazolines Under Basic Conditions: Synthesis of 4‐Methoxy‐2‐phenyl‐5‐aryl‐4,5‐dihydrooxazole‐4‐carboxylate. ChemistrySelect 2023. [DOI: 10.1002/slct.202203899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Rameshwar S. Shinde
- Department of Chemistry Rashtrasant Tukadoji Maharaj Nagpur University Nagpur Maharashtra 440 033 India
| | - Aditya R. Narnawre
- Department of Chemistry Rashtrasant Tukadoji Maharaj Nagpur University Nagpur Maharashtra 440 033 India
| | - Prashik M. Walke
- Department of Chemistry Rashtrasant Tukadoji Maharaj Nagpur University Nagpur Maharashtra 440 033 India
| | - Nandkishor N. Karade
- Department of Chemistry Rashtrasant Tukadoji Maharaj Nagpur University Nagpur Maharashtra 440 033 India
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3
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Advancements in the synthesis of oxazolines. MONATSHEFTE FUR CHEMIE 2022. [DOI: 10.1007/s00706-022-02976-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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4
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Bora RE, Bilgicli HG, Üç EM, Alagöz MA, Zengin M, Gulcin İ. Synthesis, characterization, Evaluation of Metabolic Enzyme Inhibitors and in silico Studies of Thymol Based 2-Amino Thiol and Sulfonic Acid Compounds. Chem Biol Interact 2022; 366:110134. [DOI: 10.1016/j.cbi.2022.110134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 08/15/2022] [Accepted: 08/22/2022] [Indexed: 11/03/2022]
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5
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Badillo-Gómez JI, Gouygou M, Ortega-Alfaro MC, López-Cortés JG. 2-Thiazolines: an update on synthetic methods and catalysis. Org Biomol Chem 2021; 19:7497-7517. [PMID: 34524345 DOI: 10.1039/d1ob01180d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
2-Thiazolines are important building blocks in organic synthesis and are of great importance in many areas of chemistry. At the end of the last century, the use of 2-thiazolines increased in a significant way, especially in synthesis and catalysis. This review highlights the synthetic and catalytic value of 2-thiazolines in the last two decades. We will discuss the new synthetic methodologies for obtaining these heterocycles including new schemes for accessing their asymmetric versions. Most of the new catalytic applications include a variety of 2-thiazoline ligands containing diverse donor atoms, which in combination with metals like Pd, Ir, and Cu, among others, exhibit remarkable catalytic performances.
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Affiliation(s)
- Joel I Badillo-Gómez
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán C.P. 04510, CdMx, Mexico. .,CNRS, LCC (Laboratoire de Chimie de Coordination), Université de Toulouse, UPS, 205, route de Narbonne, 31077 Toulouse, France
| | - Maryse Gouygou
- CNRS, LCC (Laboratoire de Chimie de Coordination), Université de Toulouse, UPS, 205, route de Narbonne, 31077 Toulouse, France
| | - M Carmen Ortega-Alfaro
- Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, C.P. 04510, CdMx, Mexico.
| | - José G López-Cortés
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán C.P. 04510, CdMx, Mexico.
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6
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Popy DA. Metal Mediated Synthesis of 2‐thiazolines: Access to Regio‐ and Stereoselective
N
,
S
‐heterocycles. ChemistrySelect 2021. [DOI: 10.1002/slct.202100263] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Dilruba A. Popy
- Department of Chemistry Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj 8100 Bangladesh
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7
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Ramachandran PV, Hamann HJ. Ammonia-borane as a Catalyst for the Direct Amidation of Carboxylic Acids. Org Lett 2021; 23:2938-2942. [PMID: 33826344 DOI: 10.1021/acs.orglett.1c00591] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Ammonia-borane serves as an efficient substoichiometric (10%) precatalyst for the direct amidation of both aromatic and aliphatic carboxylic acids. In situ generation of amine-boranes precedes the amidation and, unlike the amidation with stoichiometric amine-boranes, this process is facile with 1 equiv of the acid. This methodology has high functional group tolerance and chromatography-free purification but is not amenable for esterification. The latter feature has been exploited to prepare hydroxyl- and thiol-containing amides.
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Affiliation(s)
- P Veeraraghavan Ramachandran
- Herbert C. Brown Center for Borane Research, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Henry J Hamann
- Herbert C. Brown Center for Borane Research, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
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8
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Mehedi MSA, Tepe JJ. Diastereoselective One-Pot Synthesis of Oxazolines Using Sulfur Ylides and Acyl Imines. J Org Chem 2019; 84:7219-7226. [PMID: 31117573 DOI: 10.1021/acs.joc.9b00883] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
This work describes an extended version of the Corey-Chaykovsky reaction to access oxazolines using sulfur ylides and stable precursors of acyl imines. The reaction proceeds through a mixture of aziridines and oxazolines, which provides the trans-oxazolines following in situ Heine-type aziridine ring expansion upon treatment with BF3·OEt2. Following the same one-pot procedure, amidine imides react with the sulfur ylides to provide imidazolines.
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Affiliation(s)
- Md Shafaat Al Mehedi
- Department of Chemistry , Michigan State University , East Lansing , Michigan 48823 , United States
| | - Jetze J Tepe
- Department of Chemistry , Michigan State University , East Lansing , Michigan 48823 , United States
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9
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Amino acids and peptides as reactants in multicomponent reactions: modification of peptides with heterocycle backbones through combinatorial chemistry. Mol Divers 2018; 23:317-331. [PMID: 30187297 DOI: 10.1007/s11030-018-9861-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 08/02/2018] [Indexed: 12/11/2022]
Abstract
In this study, amino acids and peptides were used as reactants in a Hantzsch multicomponent reaction in order to synthesize new structurally diverse molecules containing these synthons. As well, an applicable strategy for modification of these natural molecules with heterocycle backbones such as pyrimidine, xanthene and acridine is introduced. Using this method, a set of new amino acid- and peptide-functionalized heterocycles were synthesized in good to excellent yields under mild conditions. Furthermore, carbohydrates were used as substrates in the synthesis of some derivatives. Overall, this methodology allows the possibility of synthesis of large numbers of natural product-based libraries, using amino acids, peptides and carbohydrates through combinatorial chemistry.
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10
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Metal-catalyzed synthesis of cyclic imines: a versatile scaffold in organic synthesis. Chem Heterocycl Compd (N Y) 2018. [DOI: 10.1007/s10593-018-2264-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Waghray D, Bagdziunas G, Jacobs J, Van Meervelt L, Grazulevicius JV, Dehaen W. Diastereoselective Strategies towards Thia[n
]helicenes. Chemistry 2015; 21:18791-8. [DOI: 10.1002/chem.201502777] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Indexed: 11/08/2022]
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12
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Trose M, Lazreg F, Lesieur M, Cazin CSJ. Copper N-Heterocyclic Carbene Complexes As Active Catalysts for the Synthesis of 2-Substituted Oxazolines from Nitriles and Aminoalcohols. J Org Chem 2015; 80:9910-4. [PMID: 26423118 DOI: 10.1021/acs.joc.5b01382] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction between nitriles and aminoalcohols to access 2-substituted oxazolines was investigated. Using copper-NHC complexes, various nitriles were successfully converted into the corresponding oxazolines, under milder and less wasteful conditions than those of previously reported methods.
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Affiliation(s)
- Michael Trose
- EaStCHEM School of Chemistry, University of St. Andrews , St. Andrews, KY16 9ST, U.K
| | - Faïma Lazreg
- EaStCHEM School of Chemistry, University of St. Andrews , St. Andrews, KY16 9ST, U.K
| | - Mathieu Lesieur
- EaStCHEM School of Chemistry, University of St. Andrews , St. Andrews, KY16 9ST, U.K
| | - Catherine S J Cazin
- EaStCHEM School of Chemistry, University of St. Andrews , St. Andrews, KY16 9ST, U.K
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13
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Synthetic and structural routes for the rational conversion of peptides into small molecules. Methods Mol Biol 2015; 1268:159-93. [PMID: 25555725 DOI: 10.1007/978-1-4939-2285-7_8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The demand for modified peptides with improved stability profiles and pharmacokinetic properties is driving extensive research effort in this field. The conversion of peptides into organic molecules, as traditional drugs, is a long and puzzled way. Many and versatile approaches have been described for designing peptide mimetics: the substitution of natural residues with modified amino acids and the rigidification and modification of the backbone are the main structural and chemical routes walked in medicinal chemistry. All of these strategies have been successfully applied to obtain active new compounds in molecular biology, drug discovery and design. Here we propose a panoramic review of the most common methods for the preparation of modified peptides and the most interesting findings of the last decade.
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14
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LUO MEI, ZHANG JINGCHENG, YIN HAO. Efficient one-pot synthesis of 2-oxazolines from benzoylacetonitrile and β-aminoalcohols mediated by ZnCl2. J CHEM SCI 2015. [DOI: 10.1007/s12039-014-0761-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Pathak U, Bhattacharyya S, Mathur S. Selective thioacylation of amines in water: a convenient preparation of secondary thioamides and thiazolines. RSC Adv 2015. [DOI: 10.1039/c4ra13097a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Preparation of secondary thioamides and thiazolines via formation of β-hydroxythioamides from primary thioamides and aminoethanol in water.
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Affiliation(s)
- Uma Pathak
- Synthetic Chemistry Division
- Defence R & D Establishment
- Gwalior-474002
- India
| | | | - Sweta Mathur
- Synthetic Chemistry Division
- Defence R & D Establishment
- Gwalior-474002
- India
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16
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17
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Garg P, Chaudhary S, Milton MD. Synthesis of 2-Aryl/Heteroaryloxazolines from Nitriles under Metal- and Catalyst-Free Conditions and Evaluation of Their Antioxidant Activities. J Org Chem 2014; 79:8668-77. [DOI: 10.1021/jo501430p] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Parul Garg
- Department of Chemistry, University of Delhi, Delhi 110 007, India
| | - Shweta Chaudhary
- Department of Chemistry, University of Delhi, Delhi 110 007, India
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18
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Soumya T, Thasnim P, Bahulayan D. Step-economic and cost effective synthesis of coumarin based blue emitting fluorescent dyes. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.06.071] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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19
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Wang N, Chen B, Ma S. A Practical Synthesis of Chiral Oxazolines through a Highly Diastereoselective Coupling-Cyclization Reaction ofN-(Buta-2,3-dienyl)amides and Aryl Iodides. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201400023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Chen Z, Wen H, Li W, Zhou J, Hu J, Xia W. One-Pot Synthesis of 2-Oxazolines from Ethylα-Cyanocinnamate Derivatives withN-Bromoacetamide. J Heterocycl Chem 2013. [DOI: 10.1002/jhet.1902] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhanguo Chen
- Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering Science; Shaanxi Normal University; Xi'an Shannxi 710062 China
| | - Hua Wen
- Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering Science; Shaanxi Normal University; Xi'an Shannxi 710062 China
| | - Wenli Li
- Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering Science; Shaanxi Normal University; Xi'an Shannxi 710062 China
| | - Jimei Zhou
- Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering Science; Shaanxi Normal University; Xi'an Shannxi 710062 China
| | - Junli Hu
- Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering Science; Shaanxi Normal University; Xi'an Shannxi 710062 China
| | - Wei Xia
- Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering Science; Shaanxi Normal University; Xi'an Shannxi 710062 China
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21
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Ge H, Liu P, Li X, Sun W, Li J, Yang B, Shi Z. S–Co(II) cascade catalysis: cyclocondensation of aromatic nitriles with alkamine. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.05.132] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Chen ZG, Xia W, Wen H, Wang D, Li YN, Hu JL. Synthesis of 2-oxazolines from ethyl α-cyanocinnamate derivatives with acetamide and N-bromosuccinimide. Chem Res Chin Univ 2013. [DOI: 10.1007/s40242-013-2420-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Bengtsson C, Nelander H, Almqvist F. Asymmetric synthesis of 2,4,5-trisubstituted Δ2-thiazolines. Chemistry 2013; 19:9916-22. [PMID: 23776083 PMCID: PMC3784040 DOI: 10.1002/chem.201301120] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Indexed: 11/28/2022]
Abstract
Δ2-Thiazolines are interesting heterocycles that display a wide variety of biological characteristics. They are also common in chiral ligands used for asymmetric syntheses and as synthetic intermediates. Herein, we present asymmetric routes to 2,4,5-trisubstituted Δ2-thiazolines. These Δ2-thiazolines were synthesized from readily accessible/commercially available α,β-unsaturated methyl esters through a Sharpless asymmetric dihydroxylation and an O→N acyl migration reaction as key steps. The final products were obtained in good yields with up to 97% enantiomeric excess.
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24
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Dimitrijević E, Taylor MS. Organoboron Acids and Their Derivatives as Catalysts for Organic Synthesis. ACS Catal 2013. [DOI: 10.1021/cs4000848] [Citation(s) in RCA: 129] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Elena Dimitrijević
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S
3H6, Canada
| | - Mark S. Taylor
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S
3H6, Canada
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25
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Wang L, Guo B, Li HX, Li Q, Li HY, Lang JP. Polynuclear copper(ii) pyrazolate complexes: temperature-dependent protonolysis reactions, crystal structures and high catalytic activity toward the condensation of nitriles with 2-aminoalcohol. Dalton Trans 2013; 42:15570-80. [DOI: 10.1039/c3dt51970h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Ling Wang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
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26
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Zheng H, Lejkowski M, Hall DG. Mild boronic acid catalyzed Nazarov cyclization of divinyl alcohols in tandem with Diels–Alder cycloaddition. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2012.10.100] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Zheng H, Ghanbari S, Nakamura S, Hall DG. Boronic Acid Catalysis as a Mild and Versatile Strategy for Direct Carbo- and Heterocyclizations of Free Allylic Alcohols. Angew Chem Int Ed Engl 2012; 51:6187-90. [DOI: 10.1002/anie.201201620] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Indexed: 11/06/2022]
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28
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Zheng H, Ghanbari S, Nakamura S, Hall DG. Boronic Acid Catalysis as a Mild and Versatile Strategy for Direct Carbo- and Heterocyclizations of Free Allylic Alcohols. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201201620] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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29
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Li X, Zhou B, Zhang J, She M, An S, Ge H, Li C, Yin B, Li J, Shi Z. Solvent-Free Tandem Synthesis of 2-Thiazolines and 2-Oxazolines Catalyzed by a Copper Catalyst. European J Org Chem 2012. [DOI: 10.1002/ejoc.201101786] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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30
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Lu G, Yang L, Wu L. One-Pot Synthesis of 2-Arylthiazolines with 1-Butyl-3-Methylimidazolium Tribromide as a Catalytic Reagent. PHOSPHORUS SULFUR 2012. [DOI: 10.1080/10426507.2011.618816] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Guangzhou Lu
- a School of Pharmacy , Xinxiang Medical University , Xinxiang , Henan , China
| | - Limin Yang
- a School of Pharmacy , Xinxiang Medical University , Xinxiang , Henan , China
| | - Liqiang Wu
- a School of Pharmacy , Xinxiang Medical University , Xinxiang , Henan , China
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31
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Banerjee A, Kumar PS, Baskaran S. A Lewis acid initiated intramolecular cyclization of benzylidene acetal with an azide functional group: novel synthesis of oxazolines and oxazines. Chem Commun (Camb) 2011; 47:12218-20. [DOI: 10.1039/c1cc14722f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Zheng H, Lejkowski M, Hall DG. Mild and selective boronic acid catalyzed 1,3-transposition of allylic alcohols and Meyer–Schuster rearrangement of propargylic alcohols. Chem Sci 2011. [DOI: 10.1039/c1sc00140j] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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33
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KAIZUKA K, MIYAMURA H, KOBAYASHI S. Aerobic Oxidation of Alcohols and Direct Oxidative Ester Formation Catalyzed by Polymer-Immobilized Bimetallic Nanocluster Catalysts. KOBUNSHI RONBUNSHU 2011. [DOI: 10.1295/koron.68.493] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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McCubbin JA, Hosseini H, Krokhin OV. Boronic Acid Catalyzed Friedel−Crafts Reactions of Allylic Alcohols with Electron-Rich Arenes and Heteroarenes. J Org Chem 2010; 75:959-62. [PMID: 20055455 DOI: 10.1021/jo9023073] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Adam McCubbin
- Department of Chemistry, University of Winnipeg, 515 Portage Avenue, Winnipeg, MB R3B 2E9, Canada
| | - Hamidreza Hosseini
- Department of Chemistry, University of Winnipeg, 515 Portage Avenue, Winnipeg, MB R3B 2E9, Canada
| | - Oleg V. Krokhin
- Department of Chemistry, University of Winnipeg, 515 Portage Avenue, Winnipeg, MB R3B 2E9, Canada
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37
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Dehydrative cyclization of serine, threonine, and cysteine residues catalyzed by molybdenum(VI) oxo compounds. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.12.074] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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38
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Gaumont AC, Gulea M, Levillain J. Overview of the Chemistry of 2-Thiazolines. Chem Rev 2009; 109:1371-401. [DOI: 10.1021/cr800189z] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Annie-Claude Gaumont
- Laboratoire de Chimie Moléculaire et Thioorganique, UMR CNRS 6507, INC3M, FR 3038, ENSICAEN & Université de Caen, 14050 Caen, France
| | - Mihaela Gulea
- Laboratoire de Chimie Moléculaire et Thioorganique, UMR CNRS 6507, INC3M, FR 3038, ENSICAEN & Université de Caen, 14050 Caen, France
| | - Jocelyne Levillain
- Laboratoire de Chimie Moléculaire et Thioorganique, UMR CNRS 6507, INC3M, FR 3038, ENSICAEN & Université de Caen, 14050 Caen, France
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39
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Ohshima T, Iwasaki T, Mashima K. Development of Environmentally Benign Catalytic Reactions Using Tetranuclear Zinc Clusters. J SYN ORG CHEM JPN 2009. [DOI: 10.5059/yukigoseikyokaishi.67.494] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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40
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Vagner J, Qu H, Hruby VJ. Peptidomimetics, a synthetic tool of drug discovery. Curr Opin Chem Biol 2008; 12:292-6. [PMID: 18423417 PMCID: PMC2515564 DOI: 10.1016/j.cbpa.2008.03.009] [Citation(s) in RCA: 387] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2008] [Revised: 03/11/2008] [Accepted: 03/14/2008] [Indexed: 10/22/2022]
Abstract
The demand for modified peptides with improved stability profiles and pharmacokinetic properties is driving extensive research effort in this field. Many structural modifications of peptides guided by rational design and molecular modeling have been established to develop novel synthetic approaches. Recent advances in the synthesis of conformationally restricted building blocks and peptide bond isosteres are discussed.
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Affiliation(s)
- Josef Vagner
- Department of Biochemistry and Molecular Biophysics, Bio5 Institute, University of Arizona, Tucson, AZ, 85721, USA
| | - Hongchang Qu
- Department of Chemistry, University of Arizona, Tucson, AZ, 85721, USA
| | - Victor J. Hruby
- Department of Chemistry, University of Arizona, Tucson, AZ, 85721, USA
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41
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Chaudhry P, Schoenen F, Neuenswander B, Lushington GH, Aubé J. One-step synthesis of oxazoline and dihydrooxazine libraries. JOURNAL OF COMBINATORIAL CHEMISTRY 2007; 9:473-6. [PMID: 17391008 PMCID: PMC2539067 DOI: 10.1021/cc060159t] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of 1,2- and 1,3-hydroxyalkyl azides and aldehydes in the presence of Lewis acid result in the one-step construction of oxazolines and dihydrooxazines, respectively. The reaction was adapted to parallel synthesis using a polymer-bound phosphine to scavenge excess hydroxyalkyl azide. Thus, a 60-member library of various disubstituted oxazolines and di- and trisubstituted dihydrooxazines was generated.
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Affiliation(s)
- Priyanka Chaudhry
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, USA
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42
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Sakakura A, Umemura S, Kondo R, Ishihara K. Dehydrative Cyclization Catalyzed by the Combination of Molybdenum(VI) Oxides and Benzoic Acids: First Synthesis of the Antitumour Substance BE-70016. Adv Synth Catal 2007. [DOI: 10.1002/adsc.200600550] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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43
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Wipf P, Waller DL, Reeves JT. Transition-metal-mediated cascade reactions: the water-accelerated carboalumination-Claisen rearrangement-carbonyl addition reaction. J Org Chem 2006; 70:8096-102. [PMID: 16277333 DOI: 10.1021/jo051211v] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Chemical reaction: See text] A three-step cascade reaction involving a water-accelerated catalytic carboalumination, a Claisen rearrangement, and a nucleophilic carbonyl addition converts terminal alkynes and allyl vinyl ethers into allylic alcohols containing up to three contiguous asymmetric carbon centers. Stoichiometric quantities of water as an additive increase the rate of the [3,3] sigmatropic rearrangement as well as the diastereoselectivity of the carbonyl addition process. Reaction products contain 1,6-diene functionalities that are readily cyclized to substituted cyclopentenes. An extension of this methodology to a sequence involving a [1,3] sigmatropic shift was feasible with a cyclopropylmethyl vinyl ether substrate.
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Affiliation(s)
- Peter Wipf
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA. pwipf+@pitt.edu
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44
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Ohshima T, Iwasaki T, Mashima K. Direct conversion of esters, lactones, and carboxylic acids to oxazolines catalyzed by a tetranuclear zinc cluster. Chem Commun (Camb) 2006:2711-3. [PMID: 16786096 DOI: 10.1039/b605066b] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tetranuclear zinc cluster Zn4(OCOCF3)6O catalyzes the direct conversion of esters, lactones, and carboxylic acids to oxazolines with remarkable chemoselectivity.
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Affiliation(s)
- Takashi Ohshima
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
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45
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Takeuchi M, Akiyama R, Kobayashi S. Polymer−Micelle Incarcerated Scandium as a Polymer-Supported Catalyst for High-Throughput Organic Synthesis. J Am Chem Soc 2005; 127:13096-7. [PMID: 16173708 DOI: 10.1021/ja053176f] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel immobilization technique for Sc(OTf)3, a polymer-micelle incarcerated (PMI) method, has been developed. PMI Sc(OTf)3 is highly active in several fundamental carbon-carbon bond-forming reactions. The catalyst is recovered quantitatively by simple filtration and reused several times without loss of catalytic activity, and no Sc leaching was observed in all reactions (<0.1 ppm). In addition, several solvents are available, and these aspects are suitable for high-throughput organic synthesis (HTOS). To the best of our knowledge, this is the first example of immobilization of Lewis acids utilizing polymer micelles.
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Affiliation(s)
- Masahiro Takeuchi
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, The HFRE Division, ERATO, Japan Science and Technology Agency, Tokyo 113-0033, Japan
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46
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Sokolov VB, Aksinenko AY, Epishina TA, Goreva TV, Pushin AN, Martynov IV. Acylimines of hexafluoroacetone and methyl trifluoropyruvate in cyclocondensation with 2-aminothiazolines. Russ Chem Bull 2005. [DOI: 10.1007/s11172-006-0019-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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47
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Crosignani S, Swinnen D. A Straightforward, One-Pot Protocol for the Preparation of Libraries of 2-Oxazolines. ACTA ACUST UNITED AC 2005; 7:688-96. [PMID: 16153063 DOI: 10.1021/cc050011u] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A practical protocol for the parallel synthesis of 2-oxazolines using polymer-supported reagents is described. Polymer-supported Mukaiyama reagent is used to couple a carboxylic acid with an amino alcohol, giving a beta-hydroxyamide, which is then cyclized in situ using either polymer-supported sulfonyl chloride resin or polymer-bound 2-fluoropyridinium triflate. Both 2,4-disubstituted and 2,4,5-trisubstituted 2-oxazolines are obtained in high yields and excellent purities after a simple resin filtration and solvent evaporation routine.
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Affiliation(s)
- Stefano Crosignani
- Serono Pharmaceutical Research Institute, 14 Chemin des Aulx, 1228 Plan-les-Ouates, Geneva, Switzerland.
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48
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Sakakura A, Kondo R, Ishihara K. Molybdenum Oxides as Highly Effective Dehydrative Cyclization Catalysts for the Synthesis of Oxazolines and Thiazolines. Org Lett 2005; 7:1971-4. [PMID: 15876032 DOI: 10.1021/ol050543j] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the presence of molybdenum oxide the dehydrative cyclization of N-acylserines, N-acylthreonines, and N-acylcysteines can be carried out under Dean-Stark conditions in toluene to give oxazolines and thiazolines. The ammonium salts (NH(4))(6)Mo(7)O(24).4H(2)O and (NH(4))(2)MoO(4) have excellent catalytic activities for the dehydrative cyclization of serine and threonine derivatives, and the acetylacetonate complex MoO(2)(acac)(2) has a remarkable catalytic activity for the dehydrative cyclization of cysteine derivatives. In addition, polyaniline-supported MoO(2)(acac)(2) can easily be recovered and reused.
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Affiliation(s)
- Akira Sakakura
- Graduate School of Engineering, Nagoya University, Chikusa, Japan
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49
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Lavastre O, Bonnette F, Gallard L. Parallel and combinatorial approaches for synthesis of ligands. Curr Opin Chem Biol 2004; 8:311-8. [PMID: 15183330 DOI: 10.1016/j.cbpa.2004.04.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Although new detection screening methods must still be developed, the actual main limitation in combinatorial chemistry seems to be the diversity of ligands that can be generated in terms of real structural and chemical diversity. Thus, there is a strong interest for the development of different strategies for the parallel or combinatorial synthesis of ligands. We report here a selection of recent attempts proposing 'open' approaches able to increase the diversity of molecular architecture truly accessible via parallel or combinatorial processes.
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Affiliation(s)
- Olivier Lavastre
- Institut de chimie, UMR 6509 CNRS-Université de Rennes1, Campus de Beaulieu 35042 Rennes, France.
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50
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Katritzky AR, Cai C, Suzuki K, Singh SK. Facile syntheses of oxazolines and thiazolines with N-acylbenzotriazoles under microwave irradiation. J Org Chem 2004; 69:811-4. [PMID: 14750808 DOI: 10.1021/jo0355092] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Microwave reactions of 2-amino-2-methyl-1-propanol (2) or 2-aminoethanethiol hydrochloride (4) with readily available N-acylbenzotriazoles 1a-j in the presence of SOCl(2) produced 2-substituted 2-oxazolines 3a-j in 84-98% yields and 2-substituted thiazolines 5a-i in 85-97% yields, respectively. With use of this method chiral oxazoline 6, bisoxazoline 7, bisthiazoline 8, and 5,6-dihydro-4H-1,3-oxazines 9 or 10 have also been prepared in 82-96% yields. These results demonstrate a new application of N-acylbenzotriazoles in the preparation of oxazolines and thiazolines under mild conditions and short reaction times with microwave irradiation.
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Affiliation(s)
- Alan R Katritzky
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA.
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