1
|
Martos M, Pastor IM. Nickel-Imidazolium Low Transition Temperature Mixtures with Lewis-Acidic Character. Molecules 2023; 28:6338. [PMID: 37687182 PMCID: PMC10490159 DOI: 10.3390/molecules28176338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 08/16/2023] [Accepted: 08/19/2023] [Indexed: 09/10/2023] Open
Abstract
Low transition temperature mixtures (LTTMs) are a new generation of solvents that have found extensive application in organic synthesis. The interactions between the components often generate highly activated, catalytically active species, thus opening the possibility of using LTTMs as catalysts, rather than solvents. In this work, we introduce a nickel-based imidazolium LTTM, study its thermal behavior and explore its catalytic activity in the solvent-free allylation of heterocycles with allylic alcohols. This system is effective in this reaction, affording the corresponding products in excellent yield without the need for additional purifications, thus resulting in a very environmentally friendly protocol.
Collapse
Affiliation(s)
| | - Isidro M. Pastor
- Institute of Organic Synthesis, University of Alicante, ctra. San Vicente del Raspeig s/n, San Vicente del Raspeig, 03690 Alicante, Spain;
| |
Collapse
|
2
|
Fronduti M, Del Giacco T, Rossi E, Tiecco M, Germani R. Insights into the structural features of deep eutectic solvents: the eutectic point as an unicum in their physical properties and the surface tension as a method for its determination. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
|
3
|
Advances in the development of novel green liquids: thymol/water, thymol/urea and thymol/phenylacetic acid as innovative hydrophobic natural deep eutectic solvents. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
4
|
Brambilla E, Bortolla A, Pirovano V, Caselli A, Tiecco M, Abbiati G. Silver Catalysed A
3
‐Coupling Reactions in Phenylacetic Acid/Alkylamine N‐Oxide Eutectic Mixture Under Dielectric Heating: an Alternative Approach to Propargylamines. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Elisa Brambilla
- Dipartimento di Scienze Farmaceutiche Sezione di Chimica Generale e Organica “A. Marchesini”, Università degli Studi di Milano Milano Italy
| | - Alison Bortolla
- Dipartimento di Scienze Farmaceutiche Sezione di Chimica Generale e Organica “A. Marchesini”, Università degli Studi di Milano Milano Italy
| | - Valentina Pirovano
- Dipartimento di Scienze Farmaceutiche Sezione di Chimica Generale e Organica “A. Marchesini”, Università degli Studi di Milano Milano Italy
| | - Alessandro Caselli
- Dipartimento di Chimica and CNR‐SCITEC Università degli Studi di Milano Milano Italy
| | - Matteo Tiecco
- Dipartimento di Chimica, Biologia e Biotecnologie Università degli Studi di Perugia Perugia Italy
| | - Giorgio Abbiati
- Dipartimento di Scienze Farmaceutiche Sezione di Chimica Generale e Organica “A. Marchesini”, Università degli Studi di Milano Milano Italy
| |
Collapse
|
5
|
Mankad Y, Thorat SS, Das P, Rama Krishna G, Kontham R, Reddy DS. Ready Access to Benzannulated [5,5]-Oxaspirolactones Using Au(III)-Catalyzed Cascade Cyclizations. J Org Chem 2022; 87:3025-3041. [PMID: 35188770 DOI: 10.1021/acs.joc.1c02843] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This work showcases an unprecedented Au(III)-catalyzed cascade cyclization of 2-(4-hydroxyalkynyl)benzoates to access benzannulated [5,5]-oxaspirolactones related to biologically active natural products. This reaction proceeds through an initial 5-endo-dig mode of hydroalkoxylation of the alkynol segment to give the oxocarbenium species (via cyclic enol-ether) followed by the addition of carboxylate onto the oxocarbenium that delivers the oxaspirolactone scaffold. While testing this method's scope, we found that the steric and electronic environment of the hydroxyl group could alter the reaction pathway that delivers isochromenone through a competitive 6-endo-dig mode of attack of the carboxylate onto the tethered alkyne.
Collapse
Affiliation(s)
- Yash Mankad
- Natural Products and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India.,Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Sagar S Thorat
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Pronay Das
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Gamidi Rama Krishna
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India.,Center for Materials Characterization, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India
| | - Ravindar Kontham
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - D Srinivasa Reddy
- Natural Products and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India.,Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| |
Collapse
|
6
|
El Qami A, Jismy B, Akssira M, Jacquemin J, Tikad A, Abarbri M. A Ag 2CO 3/TFA-catalyzed intramolecular annulation approach to imidazo[1,2- c][1,3]oxazin-5-one derivatives. Org Biomol Chem 2022; 20:1518-1531. [PMID: 35112683 DOI: 10.1039/d1ob02352g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of 2,7-disubstituted 3-methylimidazo[1,2-c][1,3]oxazin-5-ones were synthesized in good yields via Ag2CO3/TFA-mediated intramolecular annulation of N-Boc-2-alkynyl-4-bromo(alkynyl)-5-methylimidazoles. This methodology was carried out in the presence of a catalytic amount of silver carbonate and trifluoroacetic acid in dichloroethane at 60 °C. In all experiments, only the six-membered ring product was obtained since the possible five-membered compound was not observed, proving the high regioselectivity of this approach. A complementary computational study was performed in order to rationalize the mechanism of 6-endo-dig heterocycle formation. In addition, 2-bromo-3-methyl-7-phenylimidazo[1,2-c][1,3]oxazin-5-one was used as a building block to synthesize a small library of new 2-substituted imidazo[1,2-c][1,3]oxazin-5-one derivatives through the Suzuki, Sonogashira and Heck cross coupling reactions.
Collapse
Affiliation(s)
- Abdelkarim El Qami
- Laboratoire de Physico-Chimie des Matériaux et des Electrolytes pour l'Energie (PCM2E), EA 6299, Université de Tours, Faculté des Sciences et Techniques, Avenue Monge Faculté des Sciences, Parc de Grandmont, 37200 Tours, France. .,Laboratoire de Chimie Physique et de Chimie Bioorganique, URAC 22. Université Hassan II de Casablanca, Faculté des Sciences et Techniques de Mohammedia, B.P. 146, 28800 Mohammedia, Morocco
| | - Badr Jismy
- Laboratoire de Physico-Chimie des Matériaux et des Electrolytes pour l'Energie (PCM2E), EA 6299, Université de Tours, Faculté des Sciences et Techniques, Avenue Monge Faculté des Sciences, Parc de Grandmont, 37200 Tours, France.
| | - Mohamed Akssira
- Laboratoire de Chimie Physique et de Chimie Bioorganique, URAC 22. Université Hassan II de Casablanca, Faculté des Sciences et Techniques de Mohammedia, B.P. 146, 28800 Mohammedia, Morocco
| | - Johan Jacquemin
- Laboratoire de Physico-Chimie des Matériaux et des Electrolytes pour l'Energie (PCM2E), EA 6299, Université de Tours, Faculté des Sciences et Techniques, Avenue Monge Faculté des Sciences, Parc de Grandmont, 37200 Tours, France.
| | - Abdellatif Tikad
- Laboratoire de Chimie Moléculaire et Substances Naturelles. Université Moulay Ismail, Faculté des Sciences, B.P. 11201, Zitoune, Meknès, Morocco
| | - Mohamed Abarbri
- Laboratoire de Physico-Chimie des Matériaux et des Electrolytes pour l'Energie (PCM2E), EA 6299, Université de Tours, Faculté des Sciences et Techniques, Avenue Monge Faculté des Sciences, Parc de Grandmont, 37200 Tours, France.
| |
Collapse
|
7
|
Design, synthesis and biological evaluation of new thiazole scaffolds as potential TRPM8 antagonists. Bioorg Med Chem Lett 2021; 52:128392. [PMID: 34606996 DOI: 10.1016/j.bmcl.2021.128392] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 09/24/2021] [Accepted: 09/27/2021] [Indexed: 11/21/2022]
Abstract
The preliminary results on the development of a viable methodology for the further functionalization of 4-hydroxythiazole derivatives to afford target TRPM8 antagonists are reported. The combined Sonogashira coupling/annulation reactions of the ethyl 2-(3-fluorophenyl)-4-tifluoromethylsulfonyloxy-1,3-thiazole-5-carboxylate have been applied to the synthesis of analogues of the selective blocker of TRPM8 DFL23448. Among all the synthetised derivatives, the most promising compound resulted to be active as TRPM8 blocker (IC50 = 4.06 µM), showing an excellent metabolic stability and no cytotoxic effects. Finally, in silico characterisation of the derivatives showed no violation of the drug-likeness rules.
Collapse
|
8
|
Tiecco M, Di Guida I, Gentili PL, Germani R, Bonaccorso C, Cesaretti A. Probing the structural features and the micro-heterogeneity of various deep eutectic solvents and their water dilutions by the photophysical behaviour of two fluorophores. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115718] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
|
9
|
Kole PB, Aggarwal H, Narra S, Vernekar A, Singh FV. Metal-free synthesis and single crystal X-ray analysis of 4-aryl-6-hydroxy-2Η-pyran-2-cyanomethylenes. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.129913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
10
|
Valvi A, Tiwari S. Solvent‐Controlled Regioselectivity in Nucleophilic Substitution Reactions of 1‐X‐2,4‐Difluorobenzenes with Morpholine Using Deep Eutectic Solvents. ChemistrySelect 2021. [DOI: 10.1002/slct.202002806] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Arun Valvi
- Department of Chemistry Karmaveer Bhaurao Patil College Vashi, Navi Mumbai 400703 India
| | - Shraeddha Tiwari
- Department of Chemistry Institute of Chemical Technology Mumbai 400019 India
| |
Collapse
|
11
|
Asymmetric transfer hydrogenation of unsaturated ketones; factors influencing 1,4- vs 1,2- regio- and enantioselectivity, and alkene vs alkyne directing effects. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131771] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
12
|
Giofrè SV, Tiecco M, Celesti C, Patanè S, Triolo C, Gulino A, Spitaleri L, Scalese S, Scuderi M, Iannazzo D. Eco-Friendly 1,3-Dipolar Cycloaddition Reactions on Graphene Quantum Dots in Natural Deep Eutectic Solvent. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E2549. [PMID: 33352966 PMCID: PMC7765906 DOI: 10.3390/nano10122549] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 12/15/2020] [Accepted: 12/16/2020] [Indexed: 12/12/2022]
Abstract
Due to their outstanding physicochemical properties, the next generation of the graphene family-graphene quantum dots (GQDs)-are at the cutting edge of nanotechnology development. GQDs generally possess many hydrophilic functionalities which allow their dispersibility in water but, on the other hand, could interfere with reactions that are mainly performed in organic solvents, as for cycloaddition reactions. We investigated the 1,3-dipolar cycloaddition (1,3-DCA) reactions of the C-ethoxycarbonyl N-methyl nitrone 1a and the newly synthesized C-diethoxyphosphorylpropilidene N-benzyl nitrone 1b with the surface of GQDs, affording the isoxazolidine cycloadducts isox-GQDs 2a and isox-GQDs 2b. Reactions were performed in mild and eco-friendly conditions, through the use of a natural deep eutectic solvent (NADES), free of chloride or any metal ions in its composition, and formed by the zwitterionic trimethylglycine as the -bond acceptor, and glycolic acid as the hydrogen-bond donor. The results reported in this study have for the first time proved the possibility of performing cycloaddition reactions directly to the p-cloud of the GQDs surface. The use of DES for the cycloaddition reactions on GQDs, other than to improve the solubility of reactants, has been shown to bring additional advantages because of the great affinity of these green solvents with aromatic systems.
Collapse
Affiliation(s)
- Salvatore V. Giofrè
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, I-98168 Messina, Italy;
| | - Matteo Tiecco
- Department of Chemistry, Biology and Biotechnology, University of Perugia, I-06123 Perugia, Italy;
| | - Consuelo Celesti
- Department of Engineering, University of Messina, I-98166 Messina, Italy;
| | - Salvatore Patanè
- Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, I-98166 Messina, Italy;
| | - Claudia Triolo
- Department of Civil, Energy, Environmental and Materials Engineering, Mediterranea University, I-89122 Reggio Calabria, Italy;
| | - Antonino Gulino
- Department of Chemical Sciences, University of Catania and I.N.S.T.M. UdR of Catania, I-95125 Catania, Italy; (A.G.); (L.S.)
| | - Luca Spitaleri
- Department of Chemical Sciences, University of Catania and I.N.S.T.M. UdR of Catania, I-95125 Catania, Italy; (A.G.); (L.S.)
| | - Silvia Scalese
- Institute for Microelectronics and Microsystems, National Research Council (CNR-IMM), Ottava Strada n.5, I-95121 Catania, Italy; (S.S.); (M.S.)
| | - Mario Scuderi
- Institute for Microelectronics and Microsystems, National Research Council (CNR-IMM), Ottava Strada n.5, I-95121 Catania, Italy; (S.S.); (M.S.)
| | - Daniela Iannazzo
- Department of Engineering, University of Messina, I-98166 Messina, Italy;
| |
Collapse
|
13
|
Millán D, Rojas M, Tapia RA, Pavez P. Microwave-assisted nucleophilic degradation of organophosphorus pesticides in propylene carbonate. Org Biomol Chem 2020; 18:7868-7875. [PMID: 32985641 DOI: 10.1039/d0ob01620a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Propylene carbonate is becoming a suitable green alternative to volatile organic solvents in the study of chemical reactions. In this study, an efficient method for nucleophilic degradation of five organophosphorus pesticides, fenitrothion, malathion, diazinon, parathion, and paraoxon, using propylene carbonate as a solvent is proposed. The effect of changing the nature of the nucleophile and the influence of microwave (MW) heating were investigated. A screening of temperatures (50 °C-120 °C) was performed under microwave heating. The pesticide degradation was followed by 31P NMR, and the extent of conversion (%) was calculated by the integration of phosphorus signals. Keeping in mind that recently it has been reported that some ionic liquids play a nucleophilic role, in this work we report for the first time the degradation of organophosphorus pesticides by using an amino acid-based ionic liquid such as Bmim[Ala] as a nucleophile and a bio-based solvent (propylene carbonate) as a reaction medium in combination with microwave heating.
Collapse
Affiliation(s)
- Daniela Millán
- Centro Integrativo de Biología y Química Aplicada (CIBQA), Universidad Bernardo O'Higgins, General Gana 1702, Santiago, Chile.
| | | | | | | |
Collapse
|
14
|
Domaradzki ME, Liu X, Ong J, Yu G, Zhang G, Simantov A, Perl E, Chen Y. Triflic acid mediated sequential cyclization of ortho-alkynylarylesters with ammonium acetate. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131437] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
15
|
Ballarotto M, Cappellini F, Maestri R, Del Giacco T, Di Profio P, Tiecco M, Germani R. Exploring the acidic catalytic role of differently structured deep eutectic solvents in the aza-Michael addition of amines to 2-vinylpiridine. MONATSHEFTE FUR CHEMIE 2020. [DOI: 10.1007/s00706-020-02660-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
16
|
Gandhi S, Baire B. Fe(III)‐Catalyzed, Cyclizative Coupling between 2‐Alkynylbenzoates and Carbinols: Rapid Generation of Polycyclic Isocoumarins and Phthalides and Mechanistic Study. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000313] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Soniya Gandhi
- Department of ChemistryInstitute of Technology Madras Chennai 600036
| | - Beeraiah Baire
- Department of ChemistryInstitute of Technology Madras Chennai 600036
| |
Collapse
|
17
|
Jumbam ND, Maganga Y, Masamba W, Mbunye NI, Mgoqi E, Mtwa S. A New Alkylation of Aryl Alcohols by Boron Trifluoride Etherate. Molecules 2019; 24:molecules24203720. [PMID: 31623100 PMCID: PMC6833367 DOI: 10.3390/molecules24203720] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/07/2019] [Accepted: 10/09/2019] [Indexed: 11/16/2022] Open
Abstract
The ethylation of aryl alcohols by an ethyl moiety of boron trifluoride etherate is described. The reaction proceeded cleanly and afforded good yields of the corresponding aryl ethyl ethers. It tolerated the presence of functional groups such as aryl, alkyl, halogens, nitro, nitrile, and amino. However, the presence of amino or nitro groups ortho to a hydroxyl group of an aryl compound drastically reduced the yields of the anticipated products due to the chelation of the aforementioned functional groups with boron trifluoride etherate. A nitrogen atom in the aromatic ring system, as exemplified by hydroxypyridine and 8-hydroxyquinoline, completely inhibited the reaction. Resorcinol, hydroquinone, and aryl alcohols with aldehyde functions decomposed under the reaction conditions.
Collapse
Affiliation(s)
- Ndze Denis Jumbam
- Department of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University, Nelson Mandela Drive, Mthatha 5117, South Africa.
| | - Yamkela Maganga
- Department of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University, Nelson Mandela Drive, Mthatha 5117, South Africa.
| | - Wayiza Masamba
- Department of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University, Nelson Mandela Drive, Mthatha 5117, South Africa.
| | - Nomthandazo I Mbunye
- Department of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University, Nelson Mandela Drive, Mthatha 5117, South Africa.
| | - Esethu Mgoqi
- Department of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University, Nelson Mandela Drive, Mthatha 5117, South Africa.
| | - Sphumusa Mtwa
- Department of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University, Nelson Mandela Drive, Mthatha 5117, South Africa.
| |
Collapse
|
18
|
Zhang X, Wan X, Cong Y, Zhen X, Li Q, Zhang-Negrerie D, Du Y, Zhao K. Lactonization of 2-Alkynylbenzoates for the Assembly of Isochromenones Mediated by BF 3·Et 2O. J Org Chem 2019; 84:10402-10411. [PMID: 31328911 DOI: 10.1021/acs.joc.9b01601] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A general and efficient lactonization method of readily available 2-alkynylbenzoates affording biologically important isochromenones has been realized via a solely BF3·Et2O-mediated 6-endo-dig cyclization process under mild conditions. An alternative mechanistic pathway in which BF3·Et2O activates the carbonyl of the ester moiety, rather than the alkyne triple bond, was postulated on the basis of control experiment results. Gram-scale reaction and further application for the assembly of more complex molecules demonstrated the practicability of the protocol.
Collapse
Affiliation(s)
- Xiang Zhang
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology , Tianjin University , Tianjin 300072 , China
| | - Xintong Wan
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology , Tianjin University , Tianjin 300072 , China
| | - Ying Cong
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology , Tianjin University , Tianjin 300072 , China
| | - Xiaohua Zhen
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology , Tianjin University , Tianjin 300072 , China
| | - Qiao Li
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology , Tianjin University , Tianjin 300072 , China
| | - Daisy Zhang-Negrerie
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology , Tianjin University , Tianjin 300072 , China
| | - Yunfei Du
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology , Tianjin University , Tianjin 300072 , China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Tianjin 300072 , China
| | - Kang Zhao
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology , Tianjin University , Tianjin 300072 , China
| |
Collapse
|