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Keydel T, Link A. Synthetic Approaches, Properties, and Applications of Acylals in Preparative and Medicinal Chemistry. Molecules 2024; 29:4451. [PMID: 39339447 PMCID: PMC11434492 DOI: 10.3390/molecules29184451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2024] [Revised: 09/16/2024] [Accepted: 09/17/2024] [Indexed: 09/30/2024] Open
Abstract
Diesters of geminal diols (R-CH(O-CO-R')2, RR'C(OCOR″)2, etc. with R = H, aryl or alkyl) are termed acylals according to IUPAC recommendations (Rule P-65.6.3.6 Acylals) if the acids involved are carboxylic acids. Similar condensation products can be obtained from various other acidic structures as well, but these related "non-classical acylals", as one might call them, differ in various aspects from classical acylals and will not be discussed in this article. Carboxylic acid diesters of geminal diols play a prominent role in organic chemistry, not only in their application as protective groups for aldehydes and ketones but also as precursors in the total synthesis of natural compounds and in a variety of organic reactions. What is more, acylals are useful as a key structural motif in clinically validated prodrug approaches. In this review, we summarise the syntheses and chemical properties of such classical acylals and show what potentially under-explored possibilities exist in the field of drug design, especially prodrugs, and classify this functional group in medicinal chemistry.
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Affiliation(s)
| | - Andreas Link
- Institute of Pharmacy, University of Greifswald, 17489 Greifswald, Germany;
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Siddiqui ZN. A convenient synthesis of coumarinyl chalcones using HClO4–SiO2: A green approach. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2015.06.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Desai S, Desai V, Shingade S. In-vitro Anti-cancer assay and apoptotic cell pathway of newly synthesized benzoxazole-N-heterocyclic hybrids as potent tyrosine kinase inhibitors. Bioorg Chem 2019; 94:103382. [PMID: 31662214 DOI: 10.1016/j.bioorg.2019.103382] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 09/30/2019] [Accepted: 10/21/2019] [Indexed: 10/25/2022]
Abstract
A series of benzoxazole-N-heterocyclic hybrids have been synthesized by a one-pot strategy. Molecular docking study revealed that such compounds have the ability to inhibit enzyme protein tyrosine kinase. The findings of this work have been the successful synthesis of benzoxazole scaffolds, featuring hybrids of benzoxazole with quinoline and quinoxaline respectively. The molecular docking studies have showed these compounds to be inhibitors of tyrosine kinase enzyme which triggers growth of cancer cells. The cytotoxicity study of compounds 4a-f showed better potency against breast cancer cell lines MCF-7 and MDA-MB-231 in contrast to oral and lung cancer cell lines KB and A549. The tyrosine kinase activity was measured using Universal Tyrosine Kinase Assay kit using horseradish peroxide (HRP)-conjugated anti-phosphotyrosine kinase solution as a substrate. The compounds 4c exhibited maximum inhibition in the activity of enzyme tyrosine kinase with IC50 value 0.10 ± 0.16 µM, than other compounds which were studied and thus proved to be inhibitors of enzyme tyrosine kinase. The selective index of all four compounds was found out to be greater than two, indicating the non-toxic behaviour, i.e. good anti-cancer activity. Further, fluorescence microscopic study helped to characterize the mode of cell death, which was found to be late apoptosis as indicated by the orange fluorescence. The SAR analysis has also been carried out.
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Affiliation(s)
- Sulaksha Desai
- Department of Chemistry, Dnyanprassarak Mandal's College and Research Centre, Assagao, Bardez, Goa 403507, India; Department of Chemistry, Goa-University, Taleigao, Goa, India
| | - Vidya Desai
- Department of Chemistry, Dnyanprassarak Mandal's College and Research Centre, Assagao, Bardez, Goa 403507, India; Department of Chemistry, Goa-University, Taleigao, Goa, India.
| | - Sunil Shingade
- Department of Pharmaceutical Chemistry, PES's Rajaram and Tarabai Bandekars College of Pharmacy, Pharmagudi, Ponda, Goa, India
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Kumbar SS, Hosamani KM, Gouripur GC, Joshi SD. Functionalization of 3-chloroformylcoumarin to coumarin Schiff bases using reusable catalyst: an approach to molecular docking and biological studies. ROYAL SOCIETY OPEN SCIENCE 2018; 5:172416. [PMID: 29892427 PMCID: PMC5990764 DOI: 10.1098/rsos.172416] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Accepted: 03/27/2018] [Indexed: 06/08/2023]
Abstract
Recently, heterogeneous catalysts have been explored eximiously in the synthesis of heterocyclic compounds. Therefore, here we used solid-supported heterogeneous silica sulfuric acid as a catalyst for the synthesis of Schiff's base of 3-chloroformylcoumarin in view of simplified procedure, reusability and acceptable efficiency, which are required in organic synthesis. An efficient and facile methodology is preferred for synthesis of a class of chromeno-3-substituted derivatives (1a-1l) with good yields. The molecular docking results showed excellent binding interactions with the Mycobacterium tuberculosis InhA-D148G mutant (PDB: 4DQU). The same biomolecules were screened for their in vitro anti-tubercular activity against the M.tb H37Rv strain and antimicrobial studies. Physico-chemistry, toxicity prediction with IC50 value and bioactivity score were also calculated for title compounds. Most active compounds were further tested for cytotoxicity studies and exhibited low-level cytotoxicity against Vero cells. The suggested conjugates are promising lead compounds for the subsequent investigation in search of new anti-tubercular agents. All the conjugates were obtained within the range and followed the Lipinski rule of 5, indicating more 'drug-like' nature.
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Affiliation(s)
- Suresh S. Kumbar
- Department of Studies in Chemistry, Karnatak University, Dharwad, 580003, Karnataka, India
| | - Kallappa M. Hosamani
- Department of Studies in Chemistry, Karnatak University, Dharwad, 580003, Karnataka, India
| | - Gangadhar C. Gouripur
- P. G. Department of Biotechnology and Microbiology, Karnatak University, Dharwad, 580003, Karnataka, India
| | - Shrinivas D. Joshi
- Novel Drug Design and Discovery Laboratory, Department of Pharmaceutical Chemistry, S.E.T.'s College of Pharmacy, Sangolli Rayanna Nagar, Dharwad 580002, Karnataka, India
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Vekariya RH, Prajapati NP, Patel HD. MCM-41-anchored sulfonic acid (MCM-41-SO3H): An efficient heterogeneous catalyst for green organic synthesis. SYNTHETIC COMMUN 2016. [DOI: 10.1080/00397911.2016.1212380] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Rajesh H. Vekariya
- Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, Gujarat, India
| | - Neelam P. Prajapati
- Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, Gujarat, India
| | - Hitesh D. Patel
- Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, Gujarat, India
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Kalla RMN, Kim MR, Kim YN, Kim I. Tungstosulfonic acid as an efficient solid acid catalyst for acylal synthesis for the protection of the aldehydic carbonyl group. NEW J CHEM 2016. [DOI: 10.1039/c5nj02697k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aldehydic carbonyl groups are eco-friendly protected by acetic anhydride using the tungstosulfonic acid catalyst and the deprotection is successful under the similar conditions in the presence of water.
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Affiliation(s)
- Reddi Mohan Naidu Kalla
- BK21 PLUS Centre for Advanced Chemical Technology
- Department of Polymer Science and Engineering
- Pusan National University
- Busan 609-735
- Republic of Korea
| | - Mi Ri Kim
- BK21 PLUS Centre for Advanced Chemical Technology
- Department of Polymer Science and Engineering
- Pusan National University
- Busan 609-735
- Republic of Korea
| | - Yu Na Kim
- BK21 PLUS Centre for Advanced Chemical Technology
- Department of Polymer Science and Engineering
- Pusan National University
- Busan 609-735
- Republic of Korea
| | - Il Kim
- BK21 PLUS Centre for Advanced Chemical Technology
- Department of Polymer Science and Engineering
- Pusan National University
- Busan 609-735
- Republic of Korea
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Green procedures for the chemoselective synthesis of acylals and their cleavage promoted by recoverable sulfonic acid based nanoporous carbon (CMK-5-SO3H). J CHEM SCI 2015. [DOI: 10.1007/s12039-015-0884-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Ma YH, Wu G, Jiang N, Ge SW, Zhou Q, Sun BW. Microwave-assisted, facile, rapid and solvent-free one pot two-component synthesis of some special acylals. CHINESE CHEM LETT 2015. [DOI: 10.1016/j.cclet.2014.11.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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SHIRINI F, KHALIGH NG. A succinimide-N-sulfonic acid catalyst for acetylation reactions in absence of a solvent. CHINESE JOURNAL OF CATALYSIS 2013. [DOI: 10.1016/s1872-2067(11)60499-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Khan AT, Khan MM, Das DK, Lal M. Silica-Supported Perchloric Acid (HClO4-SiO2): An Efficient Catalyst for One-Pot Synthesis of Functionalized Tetrahydropyrimidine Derivatives. J Heterocycl Chem 2012. [DOI: 10.1002/jhet.1017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Abu T. Khan
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781 039; India
| | - Md. Musawwer Khan
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781 039; India
| | - Deb Kumar Das
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781 039; India
| | - Mohan Lal
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781 039; India
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Tourani H, Naimi-Jamal MR, Dekamin MG, Amirnejad M. A rapid, convenient and chemoselective synthesis of acylals from aldehydes catalyzed by reusable nano-ordered MCM-41-SO3H. CR CHIM 2012. [DOI: 10.1016/j.crci.2012.06.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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13
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Basak R, Dharuman S, Reddy YS, Doddi VR, Vankar YD. HClO 4·SiO 2-mediated Improved Isomerization of Glycidic Esters to α-Hydroxy-β,γ-unsaturated Esters: Application in the Formal Synthesis of ( R)-Baclofen and β-Phenyl GABA Analogues. CHEM LETT 2012. [DOI: 10.1246/cl.2012.325] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ranjan Basak
- Department of Chemistry, Indian Institute of Technology
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Singh MS, Chowdhury S. Recent developments in solvent-free multicomponent reactions: a perfect synergy for eco-compatible organic synthesis. RSC Adv 2012. [DOI: 10.1039/c2ra01056a] [Citation(s) in RCA: 394] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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Neves CMB, Simões MMQ, Domíngues MM, Santos ICMS, Neves MPMS, Paz FAA, Silva AMS, Cavaleiro JAS. Oxidation of diclofenac catalyzed by manganese porphyrins: synthesis of novel diclofenac derivatives. RSC Adv 2012. [DOI: 10.1039/c2ra20801f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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ZSM-5-SO3H as a novel, efficient, and reusable catalyst for the chemoselective synthesis and deprotection of 1,1-diacetates under eco-friendly conditions. MONATSHEFTE FUR CHEMIE 2011. [DOI: 10.1007/s00706-011-0646-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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17
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Nasr-Esfahani M, Montazerozohori M, Gholampour T. Silica Supported Perchloric Acid: A Convenient and Environmentally Friendly Catalyst for the One-pot Multicomponent Synthesis of β-Acetamido Ketones. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201190038] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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18
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Du TJ, Wu QP, Liu HX, Chen X, Shu YN, Xi XD, Zhang QS, Li YZ. An atom-efficient and powerful method for direct esterification of silyl ethers catalyzed by HClO4–SiO2. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.12.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Liu PN, Dang L, Wang QW, Zhao SL, Xia F, Ren YJ, Gong XQ, Chen JQ. Perchloric Acid Catalyzed Homogeneous and Heterogeneous Addition of β-Dicarbonyl Compounds to Alcohols and Alkenes and Investigation of the Mechanism. J Org Chem 2010; 75:5017-30. [DOI: 10.1021/jo100517k] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pei Nian Liu
- Key Lab for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Li Dang
- Department of Chemistry, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, P. R. China
| | - Qing Wei Wang
- Key Lab for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Shu Lei Zhao
- Key Lab for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Fei Xia
- Key Lab for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Yu Jie Ren
- Key Lab for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Xue Qing Gong
- Key Lab for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Jun Qin Chen
- Key Lab for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
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Dalpozzo R, Bartoli G, Sambri L, Melchiorre P. Perchloric Acid and Its Salts: Very Powerful Catalysts in Organic Chemistry. Chem Rev 2010; 110:3501-51. [DOI: 10.1021/cr9003488] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Renato Dalpozzo
- Department of Chemistry, Università della Calabria, Ponte Bucci cubo 12/c,I-87030 Arcavacata di Rende (Cs), Italy
| | - Giuseppe Bartoli
- Department of Organic Chemistry “A. Mangini”, Università di Bologna, viale Risorgimento 4, I-40136 Bologna, Italy
| | - Letizia Sambri
- Department of Organic Chemistry “A. Mangini”, Università di Bologna, viale Risorgimento 4, I-40136 Bologna, Italy
| | - Paolo Melchiorre
- ICIQ - Institut Català d’Investigació Química, Avgda. Països Catalans 16, E-43007 Tarragona, Spain
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22
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Sartori G, Maggi R. Update 1 of: Protection (and Deprotection) of Functional Groups in Organic Synthesis by Heterogeneous Catalysis. Chem Rev 2010; 110. [PMID: 20121155 DOI: 10.1021/cr900316t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Giovanni Sartori
- Clean Synthetic Methodologies Group and National Interuniversity Consortium "Chemistry for Environment" (INCA), Unit PR2 , Dipartimento di Chimica Organica e Industriale dell'Universita, Viale G. P. Usberti 17A, 43124 Parma, Italy
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Kamble VT, Muley DB, Atkore ST, Dakore SD. Three Component Reaction: An Efficient Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones and Thiones Using Heterogeneous Catalyst. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.201090084] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Singh SP, Kumar TV, Chandrasekharam M, Giribabu L, Reddy PY. Microwave-Assisted, Rapid, Solvent-Free Aza-Michael Reaction by Perchloric Acid Impregnated on Silica Gel. SYNTHETIC COMMUN 2009. [DOI: 10.1080/00397910902883579] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Kumar A, Sharma S, Maurya RA. A novel multi-component reaction of indole, formaldehyde, and tertiary aromatic amines. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.08.046] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mahdavinia GH, Bigdeli MA, Heravi MM. Silica supported perchloric acid (HClO4–SiO2): A mild, reusable and highly efficient heterogeneous catalyst for the synthesis of amidoalkyl naphthols. CHINESE CHEM LETT 2008. [DOI: 10.1016/j.cclet.2008.06.048] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Srinivasulu M, Suryakiran N, Rajesh K, Malla Reddy S, Venkateswarlu Y. Mild and Efficient Chemoselective Synthesis of Acetals and Geminal Diacetates (Acylals) from Aldehydes using Lanthanum(III) Nitrate Hexahydrate. SYNTHETIC COMMUN 2008. [DOI: 10.1080/00397910801986010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Yadav J, Reddy B, Sreedhar P, Kondaji G, Nagaiah K. Mild and efficient conversion of aldehydes to gem-diacetates using 2nd generation ionic liquids. CATAL COMMUN 2008. [DOI: 10.1016/j.catcom.2007.02.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Shaterian HR, Yarahmadi H, Ghashang M. Silica supported perchloric acid (HClO4–SiO2): an efficient and recyclable heterogeneous catalyst for the one-pot synthesis of amidoalkyl naphthols. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.11.070] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Nagarapu L, Aneesa, Peddiraju R, Apuri S. HClO4–SiO2 as a novel and recyclable catalyst for the synthesis of 2,4,6-triarylpyridines under solvent-free conditions. CATAL COMMUN 2007. [DOI: 10.1016/j.catcom.2007.08.003] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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NAGARAJ A, SANJEEVA REDDY C. ZrOCl2 Catalysed Chemoselective Conversion of Aldehydes togeminal-Diacetates and Their Cleavage: A Mild and Efficient Method. CHINESE J CHEM 2007. [DOI: 10.1002/cjoc.200790286] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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32
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Modarresi-Alam AR, Khamooshi F, Nasrollahzadeh M, Amirazizi HA. Silica supported perchloric acid (HClO4–SiO2): an efficient reagent for the preparation of primary carbamates under solvent-free conditions. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.06.048] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Bigdeli MA, Nemati F, Mahdavinia GH. HClO4–SiO2 catalyzed stereoselective synthesis of β-amino ketones via a direct Mannich-type reaction. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.07.088] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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34
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Bigdeli MA, Heravi MM, Mahdavinia GH. Silica supported perchloric acid (HClO4-SiO2): A mild, reusable and highly efficient heterogeneous catalyst for the synthesis of 14-aryl or alkyl-14-H-dibenzo[a,j]xanthenes. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2007.05.007] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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35
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Shaterian HR, Shahrekipoor F, Ghashang M. Silica supported perchloric acid (HClO4–SiO2): A highly efficient and reusable catalyst for the protection of hydroxyl groups using HMDS under mild and ambient conditions. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2007.03.036] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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An expedient and efficient chemoselective protection of carbonyl compounds and transthioacetalization of O,O- and S,O-acetals catalyzed by HBF4-SiO2. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2006.12.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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HClO4–SiO2 and PPA–SiO2 catalyzed efficient one-pot Knoevenagel condensation, Michael addition and cyclo-dehydration of dimedone and aldehydes in acetonitrile, aqueous and solvent free conditions: Scope and limitations. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2006.12.039] [Citation(s) in RCA: 219] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kantevari S, Vuppalapati SV, Biradar DO, Nagarapu L. Highly efficient, one-pot, solvent-free synthesis of tetrasubstituted imidazoles using HClO4–SiO2 as novel heterogeneous catalyst. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2006.10.048] [Citation(s) in RCA: 138] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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40
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Silica supported perchloric acid: A mild and highly efficient heterogeneous catalyst for the synthesis of poly-substituted quinolines via Friedländer hetero-annulation. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2006.10.049] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Kamble VT, Kadam KR, Joshi NS, Muley DB. HClO4–SiO2 as a novel and recyclable catalyst for the synthesis of bis-indolylmethanes and bis-indolylglycoconjugates. CATAL COMMUN 2007. [DOI: 10.1016/j.catcom.2006.07.010] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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