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Niu B, Blackburn BG, Sachidanandan K, Cooke MV, Laulhé S. Metal-free visible-light-promoted C(sp 3)-H functionalization of aliphatic cyclic ethers using trace O 2. GREEN CHEMISTRY : AN INTERNATIONAL JOURNAL AND GREEN CHEMISTRY RESOURCE : GC 2021; 23:9454-9459. [PMID: 37180766 PMCID: PMC10181853 DOI: 10.1039/d1gc03482k] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Presented is a light-promoted C-C bond forming reaction yielding sulfone and phosphate derivatives at room temperature in the absence of metals or photoredox catalyst. This transformation proceeds in neat conditions through an auto-oxidation mechanism which is maintained through the leaching of trace amounts of O2 as sole green oxidant.
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Affiliation(s)
- Ben Niu
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Bryan G Blackburn
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Krishnakumar Sachidanandan
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Maria Victoria Cooke
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Sébastien Laulhé
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
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Romanucci V, Giordano M, Pagano R, Zimbone S, Giuffrida ML, Milardi D, Zarrelli A, Di Fabio G. Investigation on the solid-phase synthesis of silybin prodrugs and their timed-release. Bioorg Med Chem 2021; 50:116478. [PMID: 34695708 DOI: 10.1016/j.bmc.2021.116478] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 10/07/2021] [Accepted: 10/11/2021] [Indexed: 12/15/2022]
Abstract
Prodrugs are ingenious derivatives of therapeutic agents designed to improve the pharmacokinetic profile of the drug. Here, we report an efficient and regioselective solid phase approach for obtaining new prodrugs of 9″-silybins conjugated with 3'-ribonucleotide units (uridine and adenosine) as pro-moieties. Uridine and adenosine conjugates were obtained in good yields (41-50%), beginning with silibinin and its diastereomers (silybin A and silybin B), using a NovaSyn® support functionalized with an ad hoc linker, which allowed selective detachment of only the desired products. As expected, the solubility of both uridine and adenosine conjugates was higher than that of the parental natural product (5 mg/mL and 3 mg/mL for uridine and adenosine, respectively). Our investigations revealed that uridine conjugates were quickly cleaved by RNase A, releasing silybin drugs, even at low enzyme concentrations. No toxic effects were found for any ribonucleotide conjugate on differentiated neuroblastoma SH-SY5Y cells when tested at increasing concentrations. All results strongly encourage further investigations of uridine-silybin prodrugs as potential therapeutic agents for both oral and intravenous administration. The present synthetic approach represents a valuable strategy to the future design of new prodrugs with modified nucleoside pro-moieties to modulate the pharmacokinetics of silybins or different natural products with strong pharmacological activities but poor bioavailability.
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Affiliation(s)
- Valeria Romanucci
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126 Napoli, Italy
| | - Maddalena Giordano
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126 Napoli, Italy
| | - Rita Pagano
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126 Napoli, Italy
| | - Stefania Zimbone
- Istituto di Cristallografia, Consiglio Nazionale delle Ricerche, Sede Secondaria di Catania, Via Paolo Gaifami 18, 95126 Catania, Italy
| | - Maria Laura Giuffrida
- Istituto di Cristallografia, Consiglio Nazionale delle Ricerche, Sede Secondaria di Catania, Via Paolo Gaifami 18, 95126 Catania, Italy
| | - Danilo Milardi
- Istituto di Cristallografia, Consiglio Nazionale delle Ricerche, Sede Secondaria di Catania, Via Paolo Gaifami 18, 95126 Catania, Italy
| | - Armando Zarrelli
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126 Napoli, Italy
| | - Giovanni Di Fabio
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126 Napoli, Italy.
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Tsukamoto M, Oyama KI. Recent application of acidic 1,3-azolium salts as promoters in the solution-phase synthesis of nucleosides and nucleotides. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.03.074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Abstract
A substantial portion of metabolism involves transformation of phosphate esters, including pathways leading to nucleotides and oligonucleotides, carbohydrates, isoprenoids and steroids, and phosphorylated proteins. Because the natural substrates bear one or more negative charges, drugs that target these enzymes generally must be charged as well, but small charged molecules can have difficulty traversing the cell membrane by means other than endocytosis. The resulting dichotomy has stimulated a great deal of effort to develop effective prodrugs, compounds that carry little or no charge to enable them to transit biological membranes, but able to release the parent drug once inside the target cell. This chapter presents recent studies on advances in prodrug forms, along with representative examples of their application to marketed and developmental drugs.
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Affiliation(s)
- Andrew J Wiemer
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, CT, 06269, USA
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Pereira de Sousa I, Bernkop-Schnürch A. Pre-systemic metabolism of orally administered drugs and strategies to overcome it. J Control Release 2014; 192:301-9. [DOI: 10.1016/j.jconrel.2014.08.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 08/04/2014] [Accepted: 08/05/2014] [Indexed: 01/18/2023]
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