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Saneyoshi H, Ohta T, Hiyoshi Y, Saneyoshi T, Ono A. Design, Synthesis, and Cellular Uptake of Oligonucleotides Bearing Glutathione-Labile Protecting Groups. Org Lett 2019; 21:862-866. [PMID: 30714380 DOI: 10.1021/acs.orglett.8b03501] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Glutathione-labile protecting groups for phosphodiester moieties in oligonucleotides were designed, synthesized, and incorporated into oligonucleotides. The protecting groups on the phosphodiester moieties were cleaved in a buffer containing 10 mM glutathione, which was used as a model of intracellular fluid. Cellular uptake of oligonucleotides bearing glutathione-labile protecting groups was strongly affected by the location and number of the protecting groups.
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Affiliation(s)
- Hisao Saneyoshi
- Department of Material and Life Chemistry, Faculty of Engineering , Kanagawa University , 3-27-1 Rokkakubashi , Kanagawa-ku , Yokohama 221-8686 , Japan
| | - Takayuki Ohta
- Department of Material and Life Chemistry, Faculty of Engineering , Kanagawa University , 3-27-1 Rokkakubashi , Kanagawa-ku , Yokohama 221-8686 , Japan
| | - Yuki Hiyoshi
- Department of Material and Life Chemistry, Faculty of Engineering , Kanagawa University , 3-27-1 Rokkakubashi , Kanagawa-ku , Yokohama 221-8686 , Japan
| | - Takeo Saneyoshi
- Department of Pharmacology , Kyoto University Graduate School of Medicine , Kyoto 606-8501 , Japan
| | - Akira Ono
- Department of Material and Life Chemistry, Faculty of Engineering , Kanagawa University , 3-27-1 Rokkakubashi , Kanagawa-ku , Yokohama 221-8686 , Japan
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2
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Saneyoshi H, Ono A. Development of Protecting Groups for Prodrug-Type Oligonucleotide Medicines. Chem Pharm Bull (Tokyo) 2018; 66:147-154. [PMID: 29386465 DOI: 10.1248/cpb.c17-00696] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In recent years, nucleic acid-based drug therapeutics have gained considerable attention for their potential in the treatment of various diseases. However, their therapeutic value is greatly hindered by the challenge of delivering them into cells. One possible strategy to improve cellular uptake is the use of "prodrug-type oligonucleotide medicine" in which negatively charged phosphodiester moieties are masked by bio-labile protecting groups. In this review, we describe our recent studies related to bio-labile protecting groups for phosphodiester moieties in the development of prodrug-type oligonucleotide medicines.
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Affiliation(s)
- Hisao Saneyoshi
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University
| | - Akira Ono
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University
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3
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Kiuru E, Malmikare S, Ora M. Synthesis and Deprotection of Biodegradably and Thermally Protected Dinucleoside-2',5'-Monophosphate Prodrug Model of 2-5A. Chem Biodivers 2017; 14. [PMID: 28557349 DOI: 10.1002/cbdv.201700220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 05/26/2017] [Indexed: 11/09/2022]
Abstract
Protected dinucleoside-2',5'-monophosphate has been prepared to develop a prodrug strategy for 2-5A. The removal of enzymatically and thermally labile 4-(acetylthio)-2-(ethoxycarbonyl)-3-oxo-2-methylbutyl phosphate protecting group and enzymatically labile 3'-O-pivaloyloxymethyl group was followed at pH 7.5 and 37 °C by HPLC from the fully protected dimeric adenosine-2',5'-monophosphate 1 used as a model compound for 2-5A. The desired unprotected 2',3'-O-isopropylideneadenosine-2',5'-monophosphate (9) was observed to accumulate as a major product. Neither the competitive isomerization of 2',5'- to a 3',5'-linkage nor the P-O5' bond cleavage was detected. The phosphate protecting group was removed faster than the 3'-O-protection and, hence, the attack of the neighbouring 3'-OH on phosphotriester moiety did not take place.
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Affiliation(s)
- Emilia Kiuru
- Department of Chemistry, University of Turku, FI-20014, Turku
| | - Suvi Malmikare
- Department of Chemistry, University of Turku, FI-20014, Turku
| | - Mikko Ora
- Department of Chemistry, University of Turku, FI-20014, Turku
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4
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Saneyoshi H, Iketani K, Kondo K, Saneyoshi T, Okamoto I, Ono A. Synthesis and Characterization of Cell-Permeable Oligonucleotides Bearing Reduction-Activated Protecting Groups on the Internucleotide Linkages. Bioconjug Chem 2016; 27:2149-56. [PMID: 27598574 DOI: 10.1021/acs.bioconjchem.6b00368] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cell-permeable oligodeoxyribonucleotides (ODNs) bearing reduction-activated protecting groups were synthesized as oligonucleotide pro-drugs. Although these oligonucleotides were amenable to solid-phase DNA synthesis and purification, the protecting group on their phosphodiester moiety could be readily cleaved by nitroreductase and NADH. Moreover, these compounds exhibited good nuclease resistance against 3'-exonuclease and endonuclease and good stability in human serum. Fluorescein-labeled ODNs modified with reduction-activated protecting groups showed better cellular uptake compared with that of naked ODNs.
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Affiliation(s)
- Hisao Saneyoshi
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University , 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Koichi Iketani
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University , 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Kazuhiko Kondo
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University , 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Takeo Saneyoshi
- Brain Science Institute RIKEN , 2-1 Hirosawa, Wako City, Saitama 351-0198, Japan
| | - Itaru Okamoto
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University , 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Akira Ono
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University , 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
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Joachimiak Ł, Janczewski Ł, Ciekot J, Boratyński J, Błażewska K. Applying the prodrug strategy to α-phosphonocarboxylate inhibitors of Rab GGTase--synthesis and stability studies. Org Biomol Chem 2016; 13:6844-56. [PMID: 26018626 DOI: 10.1039/c5ob00281h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Fourteen novel prodrug-like analogs of two highly ionic phosphonocarboxylate inhibitors of Rab geranylgeranyl transferase were synthesized and preliminary assessment of their chemical and enzymatic stability was evaluated in buffers (pH 6.5 and 7.4) and rat intestinal homogenate (pH 6.5). Both acidic groups in phosphonocarboxylates were subject to modification. Phosphonic acid was protected either as bis(acyloxyalkyl) ester or phosphonodiamidate derived from amino acids. The carboxylic acid group was either left unchanged or was studied as ethyl ester. The compounds exhibited favorable stability in physiologically relevant pH (t1/2 above 18 h), while in intestinal homogenate they showed a large variety of half-lives (from 5 minutes to over 150 hours). LC MS studies have shown that the main product of decomposition under studied conditions resulted from cleavage of one of the ester (for acyloxyalkyl analogs) or amide (for phosphonodiamidate) bonds with phosphorus.
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Affiliation(s)
- Łukasz Joachimiak
- Institute of Organic Chemistry, Lodz University of Technology, Żeromskiego 116, 90-924 Łódź, Poland.
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6
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Saneyoshi H, Kondo K, Sagawa N, Ono A. Glutathione-triggered activation of the model of pro-oligonucleotide with benzyl protecting groups at the internucleotide linkage. Bioorg Med Chem Lett 2015; 26:622-625. [PMID: 26639763 DOI: 10.1016/j.bmcl.2015.11.064] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 10/28/2015] [Accepted: 11/19/2015] [Indexed: 11/18/2022]
Abstract
We have examined substituted benzyl protecting groups for the phosphodiester in oligodeoxyribonucleotides. Stability of the protecting groups in buffer and rates of deprotection by glutathione (GSH) were strongly influenced by benzyl ring substituents.
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Affiliation(s)
- Hisao Saneyoshi
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan.
| | - Kazuhiko Kondo
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Naoki Sagawa
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Akira Ono
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan.
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7
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Saneyoshi H, Shimamura K, Sagawa N, Ando Y, Tomori T, Okamoto I, Ono A. Development of a photolabile protecting group for phosphodiesters in oligonucleotides. Bioorg Med Chem Lett 2015; 25:2129-32. [PMID: 25881825 DOI: 10.1016/j.bmcl.2015.03.064] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 03/20/2015] [Accepted: 03/25/2015] [Indexed: 11/17/2022]
Abstract
A photolabile protecting group, consisting of an o-nitrobenzyl group and a 3-(2'-hydroxy-3',6'-dimethylphenyl)-2,2-dimethylpropyl moiety, was developed for phosphodiesters in oligodeoxyribonucleotides. Deprotection was triggered by photoirradiation and subsequent spontaneous cyclization to release the naked oligonucleotide.
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Affiliation(s)
- Hisao Saneyoshi
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan.
| | - Kanami Shimamura
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Naoki Sagawa
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Yuki Ando
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Takahito Tomori
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Itaru Okamoto
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Akira Ono
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan.
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Sontakke VA, Shinde VS, Lönnberg H, Ora M. Synthesis and Stability of Nucleoside 3′,5′-Cyclic Phosphate Triesters Masked with Enzymatically and Thermally Labile Phosphate Protecting Groups. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403227] [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]
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9
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Arian D, Hedayati M, Zhou H, Bilis Z, Chen K, DeWeese TL, Greenberg MM. Irreversible inhibition of DNA polymerase β by small-molecule mimics of a DNA lesion. J Am Chem Soc 2014; 136:3176-83. [PMID: 24517090 DOI: 10.1021/ja411733s] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Abasic sites are ubiquitous DNA lesions that are mutagenic and cytotoxic but are removed by the base excision repair pathway. DNA polymerase β carries out two of the four steps during base excision repair, including a lyase reaction that removes the abasic site from DNA following incision of its 5'-phosphate. DNA polymerase β is overexpressed in cancer cells and is a potential anticancer target. Recently, DNA oxidized abasic sites that are produced by potent antitumor agents were shown to inactivate DNA polymerase β. A library of small molecules whose structures were inspired by the oxidized abasic sites was synthesized and screened for the ability to irreversibly inhibit DNA polymerase β. One candidate (3a) was examined more thoroughly, and modification of its phosphate backbone led to a molecule that irreversibly inactivates DNA polymerase β in solution (IC50 ≈ 21 μM), and inhibits the enzyme's lyase activity in cell lysates. A bisacetate analogue is converted in cell lysates to 3a. The bisacetate is more effective in cell lysates, more cytotoxic in prostate cancer cells than 3a and potentiates the cytotoxicity of methyl methanesulfonate between 2- and 5-fold. This is the first example of an irreversible inhibitor of the lyase activity of DNA polymerase β that works synergistically with a DNA damaging agent.
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Affiliation(s)
- Dumitru Arian
- Department of Chemistry, Johns Hopkins University , 3400 North Charles Street, Baltimore, Maryland 21218, United States
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Kiuru E, Lönnberg H, Ora M. 2-[(Acetyloxy)methyl]-4-(acetylsulfanyl)-2-(ethoxycarbonyl)-3-oxobutyl Group: A Thermolabile Protecting Group for Phosphodiesters. Helv Chim Acta 2013. [DOI: 10.1002/hlca.201300028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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11
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Moriguchi T, Sekine M, Shinozuka K. Novel method of the synthesis and hybridization properties of an oligonucleotide containing non-ionic diisopropylsilyl internucleotide linkage. Bioorg Med Chem 2013; 21:8013-8. [PMID: 24183587 DOI: 10.1016/j.bmc.2013.08.058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 08/26/2013] [Accepted: 08/27/2013] [Indexed: 10/26/2022]
Abstract
Efficient synthesis of a dithymidine dinucleotide analog bearing a diisopropylsilyl linkage instead of a phosphodiester linkage is described with respect to its incorporation into oligonucleotides. The diisopropylsilyl linkage was introduced into the oligonucleotide by preparation of the phosphoramidite derivative of a dithymidine dimer unit. The diisopropylsilyl-modified oligonucleotide exhibited hybridization behavior with both single strand and duplex DNA. The thermal stability of both the duplex and triplex showed a relative instability compared to the corresponding natural phosphodiester DNA, because of the steric hindrance of the isopropyl group on the silicon atom.
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Affiliation(s)
- Tomohisa Moriguchi
- Division of Molecular Science, Faculty of Science and Technology, Gunma University, Tenjincho 1-5-1, Kiryu, Gunma, Japan.
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Kiuru E, Ahmed Z, Lönnberg H, Beigelman L, Ora M. 2,2-Disubstituted 4-Acylthio-3-oxobutyl Groups as Esterase- and Thermolabile Protecting Groups of Phosphodiesters. J Org Chem 2013; 78:950-9. [DOI: 10.1021/jo302421u] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Emilia Kiuru
- Department of Chemistry, University of Turku, FIN-20014 Turku, Finland
| | - Zafar Ahmed
- Department of Chemistry, University of Turku, FIN-20014 Turku, Finland
| | - Harri Lönnberg
- Department of Chemistry, University of Turku, FIN-20014 Turku, Finland
| | - Leonid Beigelman
- AliosBiopharma, 260 East Grand Avenue, Second Floor, South San Francisco, California
94080, United States
| | - Mikko Ora
- Department of Chemistry, University of Turku, FIN-20014 Turku, Finland
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13
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Kiuru E, Ora M, Beigelman L, Blatt L, Lönnberg H. Synthesis and enzymatic deprotection of fully protected 2'-5' oligoadenylates (2-5A): towards a prodrug strategy for short 2-5A. Chem Biodivers 2012; 9:669-88. [PMID: 22492487 DOI: 10.1002/cbdv.201100144] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Fully protected pA2'p5'A2'p5'A trimers 1a and 1b have been prepared as prodrug candidates for a short 2'-5' oligoadenylate, 2-5A, and its 3'-O-Me analog, respectively. The kinetics of hog liver carboxyesterase (HLE)-triggered deprotection in HEPES buffer (pH 7.5) at 37° has been studied. The deprotection of 1a turned out to be very slow, and 2-5A never appeared in a fully deprotected form. By contrast, a considerable proportion of 1b was converted to the desired 2-5A trimer, although partial removal of the 3'-O-[(acetyloxy)methyl] group prior to exposure of the adjacent phosphodiester linkage resulted in 2',5'→3',5' phosphate migration and release of adenosine as side reactions.
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Affiliation(s)
- Emilia Kiuru
- Department of Chemistry, University of Turku, Turku.
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14
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Kiuru E, Ora M, Beigelman L, Blatt L, Lönnberg H. Synthesis and enzymatic deprotection of biodegradably protected dinucleoside-2',5'-monophosphates: 3-(acetyloxy)-2,2-bis(ethoxycarbonyl)propyl phosphoesters of 3'-O-(acyloxymethyl)adenylyl-2',5'-adenosines. Chem Biodivers 2011; 8:266-86. [PMID: 21337500 DOI: 10.1002/cbdv.201000288] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
As a first step towards a viable prodrug strategy for short oligoribonucleotides, such as 2-5A and its congeners, adenylyl-2',5'-adenosines bearing a 3-(acetyloxy)-2,2-bis(ethoxycarbonyl)propyl group at the phosphate moiety, and an (acetyloxy)methyl- or a (pivaloyloxy)methyl-protected 3'-OH group of the 2'-linked nucleoside have been prepared. The enzyme-triggered removal of these protecting groups by hog liver carboxyesterase at pH 7.5 and 37° has been studied. The (acetyloxy)methyl group turned out to be too labile for the 3'-O-protection, being removed faster than the phosphate-protecting group, which results in 2',5'- to 3',5'-isomerization of the internucleosidic phosphoester linkage. In addition, the starting material was unexpectedly converted to the 5'-O-acetylated derivative. (Pivaloyloxy)methyl group appears more appropriate for the purpose. The fully deprotected 2',5'-ApA was accumulated as a main product, although, even in this case, the isomerization of the starting material takes place.
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Affiliation(s)
- Emilia Kiuru
- Department of Chemistry, University of Turku, Turku, Finland.
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Ora M, Mäntyvaara A, Lönnberg H. 3-Acetyloxy-2-cyano-2-(alkylaminocarbamoyl)propyl groups as biodegradable protecting groups of nucleoside 5´-mono-phosphates. Molecules 2011; 16:552-66. [PMID: 21240146 PMCID: PMC6259260 DOI: 10.3390/molecules16010552] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Revised: 12/30/2010] [Accepted: 01/13/2011] [Indexed: 11/16/2022] Open
Abstract
Thymidine 5´-bis[3-acetyloxy-2-cyano-2-(2-phenylethylcarbamoyl)propyl]phosphate (1) has been prepared and the removal of phosphate protecting groups by hog liver carboxyesterase (HLE) at pH 7.5 and 37 °C has been followed by HPLC. The first detectable intermediates are the (RP)- and (SP)-diastereomers of the monodeacetylated triester 14, which subsequently undergo concurrent retro-aldol condensation to diester 4 and enzyme-catalyzed hydrolysis to the fully deacetylated triester 15. The former pathway predominates, representing 90% of the overall breakdown of 14. The diester 4 undergoes the enzymatic deacetylation 700 times less readily than the triester, but gives finally thymidine 5´-monophosphate as the desired main product. To elucidate the potential toxicity of the electrophilic 2-cyano-N-(2-phenylethyl)acrylamideby-product 17 released upon the deprotection, the hydrolysis of 1 has also been studied in the presence of glutathione (GSH).
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Affiliation(s)
- Mikko Ora
- Department of Chemistry, University of Turku, FIN-20014 Turku, Finland.
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16
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Leisvuori A, Aiba Y, Lönnberg T, Poijärvi-Virta P, Blatt L, Beigelman L, Lönnberg H. Chemical and enzymatic stability of amino acid derived phosphoramidates of antiviral nucleoside 5'-monophosphates bearing a biodegradable protecting group. Org Biomol Chem 2010; 8:2131-41. [PMID: 20401390 DOI: 10.1039/b924321f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ribavirin and 2'-O-methylcytidine 5'-phosphoramidates derived from L-alanine methyl ester bearing either an O-phenyl or a biodegradable O-[3-(acetyloxy)-2,2-bis(ethoxycarbonyl)propyl] or O-[3-(acetyloxymethoxy)-2,2-bis(ethoxycarbonyl)propyl] protecting group were prepared. The kinetics of the deprotection of these pro-drugs by porcine liver esterase and by a whole cell extract of human prostate carcinoma was studied by HPLC-ESI-MS/MS. The 3-(acetyloxymethoxy)-2,2-bis(ethoxycarbonyl)propyl and 3-(acetyloxy)-2,2-bis(ethoxycarbonyl)propyl groups were readily removed releasing the l-alanine methyl ester phosphoramidate nucleotide, the deprotection of the 3-(acetyloxymethoxy) derivative being approximately 20 times faster. The chemical stability of the 2'-O-methylcytidine pro-drugs was additionally determined over a pH range from 7.5 to 10.
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Affiliation(s)
- Anna Leisvuori
- Department of Chemistry, University of Turku, FIN-20014 Turku, Finland
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