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Caminiti R, Serra M, Nucera S, Ruga S, Oppedisano F, Scarano F, Macrì R, Muscoli C, Palma E, Musolino V, Statti G, Mollace V, Maiuolo J. Antioxidant Activity and Seasonal Variations in the Composition of Insoluble Fiber from the Cladodes of Opuntia ficus-indica (L.) Miller: Development of New Extraction Procedures to Improve Fiber Yield. PLANTS (BASEL, SWITZERLAND) 2024; 13:544. [PMID: 38498558 PMCID: PMC10892137 DOI: 10.3390/plants13040544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/05/2024] [Accepted: 02/13/2024] [Indexed: 03/20/2024]
Abstract
Opuntia ficus-indica (L.) Miller is a plant belonging to the Cactaceae family adapted to live in environments characterized by long periods of drought and arid or desert climates. This plant is characterized by an aerial part composed of structures transformed by branches, called "cladodes", which are essential to reduce excessive perspiration of water and appear covered with thorns. The composition of the cladodes includes water, polysaccharides, fiber, proteins, vitamins, fatty acids, sterols, polyphenols, and minerals. The main purposes of this scientific work are (a) to compare the insoluble fiber (IF) extracted from the cladodes of O. ficus-indica belonging to the same plant but collected in different seasonal periods (winter and summer) and develop new extraction protocols that are able to improve the yield obtained and (b) evaluate the antioxidant potential of the fiber and study possible variations as a result of the extraction protocol chosen. The first objective was achieved (1) by measuring the amount of IF extracted from cladodes harvested in winter and summer (CW and CS, respectively) and (2) by modifying three variables involved in the fiber extraction protocol. To achieve the second objective, the following experiments were carried out: (1) measurement of the antioxidant potential of IF in CW and CS; (2) measurement of cellular reactive oxygen species; (3) measurement of the activity of some antioxidant enzymes; and (4) comparison of the polyphenol content in CW and CS. In conclusion, the results obtained showed that the IF extraction process can be improved, achieving a uniform yield regardless of seasonality; the antioxidant effect may vary depending on the extraction protocol.
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Affiliation(s)
- Rosamaria Caminiti
- IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy; (R.C.); (M.S.); (S.R.); (F.O.); (F.S.); (R.M.); (E.P.); (V.M.)
| | - Maria Serra
- IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy; (R.C.); (M.S.); (S.R.); (F.O.); (F.S.); (R.M.); (E.P.); (V.M.)
| | - Saverio Nucera
- IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy; (R.C.); (M.S.); (S.R.); (F.O.); (F.S.); (R.M.); (E.P.); (V.M.)
| | - Stefano Ruga
- IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy; (R.C.); (M.S.); (S.R.); (F.O.); (F.S.); (R.M.); (E.P.); (V.M.)
| | - Francesca Oppedisano
- IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy; (R.C.); (M.S.); (S.R.); (F.O.); (F.S.); (R.M.); (E.P.); (V.M.)
| | - Federica Scarano
- IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy; (R.C.); (M.S.); (S.R.); (F.O.); (F.S.); (R.M.); (E.P.); (V.M.)
| | - Roberta Macrì
- IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy; (R.C.); (M.S.); (S.R.); (F.O.); (F.S.); (R.M.); (E.P.); (V.M.)
| | - Carolina Muscoli
- IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy; (R.C.); (M.S.); (S.R.); (F.O.); (F.S.); (R.M.); (E.P.); (V.M.)
| | - Ernesto Palma
- IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy; (R.C.); (M.S.); (S.R.); (F.O.); (F.S.); (R.M.); (E.P.); (V.M.)
- Veterinary Pharmacology Laboratory, Institute of Research for Food Safety and Health (IRC-FSH), Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy
| | - Vincenzo Musolino
- Laboratoy of Pharmaceutical Biology, IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy;
| | - Giancarlo Statti
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87100 Cosenza, Italy;
| | - Vincenzo Mollace
- IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy; (R.C.); (M.S.); (S.R.); (F.O.); (F.S.); (R.M.); (E.P.); (V.M.)
- Fondazione R. Dulbecco, 88046 Lamezia Terme, Italy
| | - Jessica Maiuolo
- Laboratoy of Pharmaceutical Biology, IRC-FSH Center, Department of Health Sciences, University “Magna Græcia” of Catanzaro, Germaneto, 88100 Catanzaro, Italy;
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Reyes E, Prieto L, Uria U, Carrillo L, Vicario JL. Recent Advances in the Prins Reaction. ACS OMEGA 2022; 7:31621-31627. [PMID: 36120064 PMCID: PMC9476534 DOI: 10.1021/acsomega.2c04765] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 08/22/2022] [Indexed: 06/15/2023]
Abstract
The Prins reaction is a very convenient synthetic platform for the preparation of oxygen-containing heterocyclic compounds, especially tetrahydropyrans and tetrahydrofurans. While this reaction has been extensively used by synthetic chemists since its discovery, the last years have witnessed impressive improvements in its performance and scope and especially in the development of new catalytic and enantioselective versions. This mini-review presents these recent advances through selected representative examples.
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Affiliation(s)
- Efraim Reyes
- Department
of Organic and Inorganic Chemistry, University
of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
| | | | | | | | - Jose L. Vicario
- Department
of Organic and Inorganic Chemistry, University
of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
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Das S, Banik R, Kumar B, Roy S, Noorussabah, Amhad K, Sukul PK. A Green Approach for Organic Transformations Using Microwave Reactor. Curr Org Synth 2020; 16:730-764. [PMID: 31984890 DOI: 10.2174/1570179416666190412160048] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 03/06/2019] [Accepted: 03/14/2019] [Indexed: 02/07/2023]
Abstract
Microwave-assisted organic transformation (MAOR) is presently gaining wide popularity in the field of organic synthesis. The conventional heating technique is gradually being removed from the laboratory and a novel microwave heating technique established to be used in both academia and industry. As compared to the classical organic methodology, the green technology tools have several advantages like dramatically reduced reaction times, improved yields, site selectivity, and the increased product purities with simplification of work-up procedures. In the current study, we have briefly described the overview of recent developments and applications of microwave irradiation in organic transformation with schematic compiling of the organic reactions, bioactive heterocyclic compounds, and so on. This review also presents a critical analysis of the various advantages of microwave irradiation in organic synthesis/transformation compared to the classical or conventional heating. So, we believe that our current study of the green microwave heating technique will be highly beneficial for the researchers from both academia and industry in their near future.
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Affiliation(s)
- Subrata Das
- Department of Chemistry, National Institute of Technology, Panta 800005, India
| | - Rupak Banik
- Department of Chemistry, National Institute of Technology Agartala 799046, India
| | - Brajesh Kumar
- Department of Chemistry, National Institute of Technology, Panta 800005, India
| | - Subhadip Roy
- Department of Chemistry, National Institute of Technology Agartala 799046, India
| | - Noorussabah
- Department of Chemistry, National Institute of Technology, Panta 800005, India
| | - Khursheed Amhad
- Department of Chemistry, National Institute of Technology, Panta 800005, India
| | - Pradip K Sukul
- Department of Chemistry, National Institute of Technology, Panta 800005, India
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Dubbu S, Vankar YD. Diversity-Oriented Synthesis of Carbohydrate Scaffolds through the Prins Cyclization of Differently Protectedd-Mannitol-Derived Homoallylic Alcohols. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701172] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Sateesh Dubbu
- Department of Chemistry; Indian Institute of Technology Kanpur; 208016 Kanpur India
| | - Yashwant D. Vankar
- Department of Chemistry; Indian Institute of Technology Kanpur; 208016 Kanpur India
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Organocatalyzed and mechanochemical solvent-free synthesis of novel and functionalized bis -biphenyl substituted thiazolidinones as potent tyrosinase inhibitors: SAR and molecular modeling studies. Eur J Med Chem 2017; 134:406-414. [DOI: 10.1016/j.ejmech.2017.04.021] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2017] [Revised: 03/18/2017] [Accepted: 04/11/2017] [Indexed: 12/25/2022]
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Boev VI, Moskalenko AI, Belopukhov SL, Nikonova GN. Stereoselective synthesis of 2-aryl-4-en-1-ols, promising synthons for the preparation of oxygen heterocycles. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2017. [DOI: 10.1134/s1070428017020051] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Boev VI, Moskalenko AI, Belopukhov SL, Nikonova GN. Stereodirected reactions of salicilaldehyde derivatives with tert-butyl 3(4)-hydroxy-2(3)-(3-methylbut-2-enyl)- piperidine-1-carboxylates as an efficient preparation procedure of tetrahydropyran derivatives fused with a piperidine ring. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2016. [DOI: 10.1134/s1070428016080108] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Liu GQ, Cui B, Xu R, Li YM. Preparation of trans-2-Substituted-4-halopiperidines and cis-2-Substituted-4-halotetrahydropyrans via AlCl3-Catalyzed Prins Reaction. J Org Chem 2016; 81:5144-61. [PMID: 27214117 DOI: 10.1021/acs.joc.6b00725] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A general and practical method for the preparation of trans-2-substituted-4-halopiperidines and cis-2-substituted-4-halotetrahydropyrans is reported. Using 5 mol % of AlCl3 as the catalyst and 2 equiv of trimethylsilyl halides as the halide sources, aza-Prins cyclization of N-tosyl homoallylamine or Prins cyclization of homoallylic alcohol with carbonyl compounds could be readily realized, giving the corresponding trans-2-substituted-4-halopiperidines or cis-2-substituted-4-halotetrahydropyrans in high yields and satisfactory diastereoselectivity.
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Affiliation(s)
- Gong-Qing Liu
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , Tianjin 300071, People's Republic of China
| | - Bin Cui
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , Tianjin 300071, People's Republic of China
| | - Rong Xu
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , Tianjin 300071, People's Republic of China
| | - Yue-Ming Li
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , Tianjin 300071, People's Republic of China
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Chalopin T, Jebali K, Gaulon-Nourry C, Dénès F, Lebreton J, Mathé-Allainmat M. Regioselective dihydropyran formation from 4-iodo-2,6-disubstituted tetrahydropyran derivatives using In(OAc)3/LiI system as the promoter. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.11.046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Liu GQ, Yang CH, Li YM. Modular Preparation of 5-Halomethyl-2-oxazolines via PhI(OAc)2-Promoted Intramolecular Halooxygenation of N-Allylcarboxamides. J Org Chem 2015; 80:11339-50. [DOI: 10.1021/acs.joc.5b01832] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Gong-Qing Liu
- State
Key Laboratory of Medicinal Chemical Biology, College of Pharmacy
and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300071, People’s Republic of China
| | - Chun-Hua Yang
- State
Key Laboratory of Medicinal Chemical Biology, College of Pharmacy
and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300071, People’s Republic of China
| | - Yue-Ming Li
- State
Key Laboratory of Medicinal Chemical Biology, College of Pharmacy
and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300071, People’s Republic of China
- CAS
Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
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Sultana S, Devi NR, Saikia AK. Synthesis of Substituted Tetrahydropyrans and Tetrahydrofurans via Intramolecular Hydroalkoxylation of Alkenols. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500314] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sabera Sultana
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781039 Assam India
| | - Ngangbam Renubala Devi
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781039 Assam India
| | - Anil K. Saikia
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781039 Assam India
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Abstract
In 1989, the reaction of vinyl magnesium halides with ortho-substituted nitroarenes leading to indoles was discovered. This reaction is now frequently reported as the "Bartoli reaction" or the "Bartoli indole synthesis" (BIS). It has rapidly become the shortest and most flexible route to 7-substituted indoles, because the classical indole syntheses generally fail in their preparation. The flexibility of the Bartoli reaction is great as it can be extended to heteroaromatic nitro derivatives and can be run on solid support. This review will focus on the use of the Bartoli indole synthesis as the key step in preparations of complex indoles, which appeared in the literature in the last few years.
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Affiliation(s)
- Giuseppe Bartoli
- Dipartimento Chimica Industriale 'Toso Montanari', Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy.
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Xu Y, Yin Z, Lin X, Gan Z, He Y, Gao L, Song Z. 1,4-Hydroiodination of dienyl alcohols with TMSI to form homoallylic alcohols containing a multisubstituted Z-alkene and application to Prins cyclization. Org Lett 2015; 17:1846-9. [PMID: 25825952 DOI: 10.1021/acs.orglett.5b00485] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A regioselective 1,4-hydroiodination of dienyl alcohols has been developed using trimethylsilyl iodide as Lewis acid and iodide source. A range of homoallylic alcohols containing a multisubstituted Z-alkene was synthesized with good to excellent configurational control. The approach was applied in sequential hydroiodination/Prins cyclization to afford multisubstituted tetrahydropyrans diastereoselectively.
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Affiliation(s)
- Yongjin Xu
- † Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, and ‡ State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Zhiping Yin
- † Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, and ‡ State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Xinglong Lin
- † Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, and ‡ State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Zubao Gan
- † Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, and ‡ State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Yanyang He
- † Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, and ‡ State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Lu Gao
- † Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, and ‡ State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Zhenlei Song
- † Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, and ‡ State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
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Matsuda Y, Naoe S, Oishi S, Fujii N, Ohno H. Formal [4+2] Reaction between 1,3-Diynes and Pyrroles: Gold(I)-Catalyzed Indole Synthesis by Double Hydroarylation. Chemistry 2014; 21:1463-7. [DOI: 10.1002/chem.201405903] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Indexed: 01/24/2023]
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Clarisse D, Fache F. Application of Prins cyclization to the total synthesis of (+)-decytospolides A and B. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.02.060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Mahindra A, Patel N, Bagra N, Jain R. Solvent-free peptide synthesis assisted by microwave irradiation: environmentally benign synthesis of bioactive peptides. RSC Adv 2014. [DOI: 10.1039/c3ra46643d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Iodine-catalyzed prins cyclization of homoallylic alcohols and aldehydes. MOLECULES (BASEL, SWITZERLAND) 2013; 18:11100-30. [PMID: 24025458 PMCID: PMC6269844 DOI: 10.3390/molecules180911100] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 08/06/2013] [Accepted: 08/23/2013] [Indexed: 12/03/2022]
Abstract
The iodine-catalyzed Prins cyclization of homoallylic alcohols and aldehydes was investigated under metal-free conditions and without additives. Anhydrous conditions and inert atmosphere are not required. The reaction of 2-(3,4-dihydronaphthalen-1-yl)propan-1-ol and 21 aldehydes (aliphatic and aromatic) in CH2Cl2 in the presence of 5 mol % of iodine gave 1,4,5,6-tetrahydro-2H-benzo[f]isochromenes in 54%–86% yield. Under similar conditions, the Prins cyclization of six alcohols containing an endocyclic double bond (primary, secondary, or tertiary) led to dihydropyrans in 52%–91% yield. The acyclic homoallylic alcohols gave 4-iodo-tetrahydropyran in 29%–41% yield in the presence of 50 mol % of iodine. This type of substrate is the main limitation of the methodology. The relative configuration of the products was assigned by NMR and X-ray analysis. The mechanism and the ratio of the products are discussed, based on DFT calculations.
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Inagi S, Takei N, Fuchigami T. Synthesis of 4-iodotetrahydropyran-containing polymersvia TMSI-promoted Prins cyclization. Polym Chem 2013. [DOI: 10.1039/c2py20890c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Clarisse D, Pelotier B, Fache F. Solvent-Free, Metal-Free, Aza-Prins Cyclization: Unprecedented Access to δ-Sultams. Chemistry 2012; 19:857-60. [DOI: 10.1002/chem.201203415] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Indexed: 11/06/2022]
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Subba Reddy B, Narasimhulu G, Vikram Reddy Y, Chakravarthy P, Yadav J, Sridhar B. Sc(OTf)3/TsOH: a highly efficient catalytic system for the synthesis of 2,6-dioxabicyclo[3,2,1]octane derivatives. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.04.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Borkar P, Weghe PVD, Reddy BVS, Yadav JS, Grée R. Unprecedented synergistic effects between weak Lewis and Brønsted acids in Prins cyclization. Chem Commun (Camb) 2012; 48:9316-8. [DOI: 10.1039/c2cc35052a] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Saha P, Bhunia A, Saikia AK. Synthesis of 2,3,5,6-tetrasubstituted tetrahydropyrans via (3,5)-oxonium-ene reaction. Org Biomol Chem 2012; 10:2470-81. [DOI: 10.1039/c2ob06832j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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