1
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Nevrlka F, Bědroň A, Valenta M, Tranová L, Stýskala J. Study of Direct N7 Regioselective tert-Alkylation of 6-Substituted Purines and Their Modification at Position C6 through O, S, N, and C Substituents. ACS OMEGA 2024; 9:17368-17378. [PMID: 38645315 PMCID: PMC11024948 DOI: 10.1021/acsomega.4c00068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 02/26/2024] [Accepted: 03/27/2024] [Indexed: 04/23/2024]
Abstract
A new N7 direct regioselective method allowing the introduction of tert-alkyl groups into appropriate 6-substituted purine derivatives is developed. This method is based on a reaction of N-trimethylsilylated purines with a tert-alkyl halide using SnCl4 as a catalyst. In this work, we study the structure and optimal reaction conditions leading to the N7 isomer and in some cases also to the N9 isomer. The main goal is devoted to preparing 7-(tert-butyl)-6-chloropurine as a suitable compound for other purine transformations. The stability of the tert-butyl group at the N7 position is tested for classic model reactions, leading to the preparation of new 6,7-disubstituted purine derivatives, which is also interesting from the point of view of possible biological activity.
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Affiliation(s)
- Filip Nevrlka
- Department of Organic Chemistry, Faculty
of Science, Palacký University, 17. Listopadu 12, 771 46 Olomouc, Czech Republic
| | - Adam Bědroň
- Department of Organic Chemistry, Faculty
of Science, Palacký University, 17. Listopadu 12, 771 46 Olomouc, Czech Republic
| | - Michal Valenta
- Department of Organic Chemistry, Faculty
of Science, Palacký University, 17. Listopadu 12, 771 46 Olomouc, Czech Republic
| | - Lenka Tranová
- Department of Organic Chemistry, Faculty
of Science, Palacký University, 17. Listopadu 12, 771 46 Olomouc, Czech Republic
| | - Jakub Stýskala
- Department of Organic Chemistry, Faculty
of Science, Palacký University, 17. Listopadu 12, 771 46 Olomouc, Czech Republic
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2
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Buyens DMS, Pilcher LA, Cukrowski I. Coordination Sites for Sodium and Potassium Ions in Nucleophilic Adeninate Contact ion-Pairs: A Molecular-Wide and Electron Density-Based (MOWED) Perspective. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27186111. [PMID: 36144844 PMCID: PMC9505275 DOI: 10.3390/molecules27186111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 09/14/2022] [Accepted: 09/15/2022] [Indexed: 11/16/2022]
Abstract
The adeninate anion (Ade-) is a useful nucleophile used in the synthesis of many prodrugs (including those for HIV AIDS treatment). It exists as a contact ion-pair (CIP) with Na+ and K+ (M+) but the site of coordination is not obvious from spectroscopic data. Herein, a molecular-wide and electron density-based (MOWED) computational approach implemented in the implicit solvation model showed a strong preference for bidentate ion coordination at the N3 and N9 atoms. The N3N9-CIP has (i) the strongest inter-ionic interaction, by -30 kcal mol-1, with a significant (10-15%) covalent contribution, (ii) the most stabilized bonding framework for Ade-, and (iii) displays the largest ion-induced polarization of Ade-, rendering the N3 and N9 the most negative and, hence, most nucleophilic atoms. Alkylation of the adeninate anion at these two positions can therefore be readily explained when the metal coordinated complex is considered as the nucleophile. The addition of explicit DMSO solvent molecules did not change the trend in most nucleophilic N-atoms of Ade- for the in-plane M-Ade complexes in M-Ade-(DMSO)4 molecular systems. MOWED-based studies of the strength and nature of interactions between DMSO solvent molecules and counter ions and Ade- revealed an interesting and unexpected chemistry of intermolecular chemical bonding.
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3
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Geng J, Hu X, Zhang Z, Gu Z, Li Y, Mou X, Mao L, Ge Y, Yang X, Song Y, Liu H, Wang L, Wei Z, Wang Z, Xu H. Discovery and pharmacodynamic evaluation of the novel butene lactone derivative M355 against influenza A virus in vitro and in vivo. J Med Virol 2022; 94:4393-4405. [PMID: 35560068 DOI: 10.1002/jmv.27853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 04/26/2022] [Accepted: 05/02/2022] [Indexed: 11/06/2022]
Abstract
A new series of butene lactone derivatives were designed according to an influenza neuraminidase target and their antiviral activities against H1N1 infection of MDCK cells were evaluated. Among them, a compound that was given the name M355 was identified as the most potent against H1N1 (EC50 = 14.7 μM) with low toxicity (CC50 = 538.13 μM). It also visibly reduced the virus-induced cytopathic effect. Time-of-addition analysis indicated that H1N1 was mostly suppressed by M355 at the late stage of its infectious cycle. M355 inhibited neuraminidase in a dose-dependent fashion to a similar extent as oseltamivir, which was also indicated by computer modeling experiment. In a mouse model, lung lesions and virus load were reduced and the expression of nucleoprotein was moderated by M355. The ELISA and qRT-PCR analyses revealed that the levels of IFN-γ, IRF-3, TLR-3, TNF-α, IL-1β, IL-6 and IL-8 were down-regulated in the M355-treated groups, whereas the levels of IL-10 and IL-13 were up-regulated. Similarly, IgG was found to be increased in infected mice plasma. These results demonstrate that M355 inhibit the expression of H1N1 in both cellular and animal models. Thus, M355 has the potential to be effective in the treatment of influenza A virus infection. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Jingwei Geng
- Zhongyuan District Center for Disease Control and Prevention of Zhengzhou, Zhengzhou, 450006, China
| | - Xiaoning Hu
- Binzhou People's Hospital, Binzhou, 256610, Shandong Province, China
| | - Zhongmou Zhang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China.,Key Laboratory of "Runliang" Antiviral Medicines Research and Development, Institute of Drug Discovery & Development, Zhengzhou University, Zhengzhou, 450001, China
| | - Zichen Gu
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China.,Key Laboratory of "Runliang" Antiviral Medicines Research and Development, Institute of Drug Discovery & Development, Zhengzhou University, Zhengzhou, 450001, China
| | - Yuanyuan Li
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China
| | - Xiaodong Mou
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China
| | - Lu Mao
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China.,Key Laboratory of "Runliang" Antiviral Medicines Research and Development, Institute of Drug Discovery & Development, Zhengzhou University, Zhengzhou, 450001, China
| | - Yongzhuang Ge
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China.,Key Laboratory of "Runliang" Antiviral Medicines Research and Development, Institute of Drug Discovery & Development, Zhengzhou University, Zhengzhou, 450001, China
| | - Xinyu Yang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China
| | - Yihui Song
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China
| | - Hongmin Liu
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China.,Key Laboratory of "Runliang" Antiviral Medicines Research and Development, Institute of Drug Discovery & Development, Zhengzhou University, Zhengzhou, 450001, China
| | - Linqing Wang
- Zhengzhou Key Laboratory of molecular biology, Zhengzhou Normal University, Zhengzhou, 450044, China
| | - Zhanyong Wei
- College of Veterinary Medicine, Henan Agricultural University, Zhengzhou, 450046, China
| | - Zhenya Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China.,Key Laboratory of "Runliang" Antiviral Medicines Research and Development, Institute of Drug Discovery & Development, Zhengzhou University, Zhengzhou, 450001, China
| | - Haiwei Xu
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China.,Key Laboratory of "Runliang" Antiviral Medicines Research and Development, Institute of Drug Discovery & Development, Zhengzhou University, Zhengzhou, 450001, China
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4
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Savateev KV, Fedotov VV, Slepukhin PA, Ulomsky E, Rusinov VL. Regiospecific way to N9-alkylated thioxanthines. NEW J CHEM 2022. [DOI: 10.1039/d2nj03002k] [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 regiospecific way to N9-alkylated thioxanthines as novel acyclic nucleoside analogues has been developed. This approach is based on a cleavage methodology involving the construction of a target heterocyclic scaffold...
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5
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Wu J, Wang H, Liu Q, Li R, Gao Y, Fang X, Zhong Y, Wang M, Wang Q, Rao Z, Gong P. Remdesivir overcomes the S861 roadblock in SARS-CoV-2 polymerase elongation complex. Cell Rep 2021; 37:109882. [PMID: 34653416 PMCID: PMC8498683 DOI: 10.1016/j.celrep.2021.109882] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 07/05/2021] [Accepted: 10/04/2021] [Indexed: 12/02/2022] Open
Abstract
Remdesivir (RDV), a nucleotide analog with broad-spectrum features, has exhibited effectiveness in COVID-19 treatment. However, the precise working mechanism of RDV when targeting the viral RNA-dependent RNA polymerase (RdRP) has not been fully elucidated. Here, we solve a 3.0-Å structure of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RdRP elongation complex (EC) and assess RDV intervention in polymerase elongation phase. Although RDV could induce an “i+3” delayed termination in meta-stable complexes, only pausing and subsequent elongation are observed in the EC. A comparative investigation using an enterovirus RdRP further confirms similar delayed intervention and demonstrates that steric hindrance of the RDV-characteristic 1′-cyano at the −4 position is responsible for the “i+3” intervention, although two representative Flaviviridae RdRPs do not exhibit similar behavior. A comparison of representative viral RdRP catalytic complex structures indicates that the product RNA backbone encounters highly conserved structural elements, highlighting the broad-spectrum intervention potential of 1′-modified nucleotide analogs in anti-RNA virus drug development.
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Affiliation(s)
- Jiqin Wu
- Key Laboratory of Special Pathogens and Biosafety, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, No. 44 Xiao Hong Shan, Wuhan, Hubei 430071, China
| | - Haofeng Wang
- School of Life Sciences, Tianjin University, Tianjin 300072, China
| | - Qiaojie Liu
- Key Laboratory of Special Pathogens and Biosafety, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, No. 44 Xiao Hong Shan, Wuhan, Hubei 430071, China
| | - Rui Li
- Key Laboratory of Special Pathogens and Biosafety, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, No. 44 Xiao Hong Shan, Wuhan, Hubei 430071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yan Gao
- Laboratory of Structural Biology, School of Life Sciences and School of Medicine, Tsinghua University, Beijing 100084, China
| | - Xiang Fang
- Key Laboratory of Special Pathogens and Biosafety, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, No. 44 Xiao Hong Shan, Wuhan, Hubei 430071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yao Zhong
- Key Laboratory of Special Pathogens and Biosafety, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, No. 44 Xiao Hong Shan, Wuhan, Hubei 430071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Meihua Wang
- Key Laboratory of Special Pathogens and Biosafety, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, No. 44 Xiao Hong Shan, Wuhan, Hubei 430071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Quan Wang
- Shanghai Institute for Advanced Immunochemical Studies and School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China.
| | - Zihe Rao
- Laboratory of Structural Biology, School of Life Sciences and School of Medicine, Tsinghua University, Beijing 100084, China; Shanghai Institute for Advanced Immunochemical Studies and School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China; National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, CAS, Beijing 100101, China.
| | - Peng Gong
- Key Laboratory of Special Pathogens and Biosafety, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, No. 44 Xiao Hong Shan, Wuhan, Hubei 430071, China; Drug Discovery Center for Infectious Diseases, Nankai University, Tianjin 300350, China.
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6
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Tranová L, Stýskala J. Study of the N7 Regioselective Glycosylation of 6-Chloropurine and 2,6-Dichloropurine with Tin and Titanium Tetrachloride. J Org Chem 2021; 86:13265-13275. [PMID: 34528791 DOI: 10.1021/acs.joc.1c01186] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
6-Chloropurine and 2,6-dichloropurine were regioselectively glycosylated at position 7 to give the corresponding peracetylated N7-nucleosides, which can be suitable for other purine transformations. In this work, we study the distribution of N7/N9-isomers produced via the Vorbrüggen method under different conditions, using an N-trimethylsilylated purine derivative and SnCl4 or TiCl4 as a catalyst. The main effort is devoted to reversing the disadvantageous predominant selectivity of most glycosylation reactions at the N9 position and thus to determining conditions that maximize the regioselectivity of glycosylation toward the desired N7-isomer.
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Affiliation(s)
- Lenka Tranová
- Department of Organic Chemistry, Faculty of Science, Palacký University, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Jakub Stýskala
- Department of Organic Chemistry, Faculty of Science, Palacký University, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
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7
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Antiviral Activity of 3D, a Butene Lactone Derivative Against Influenza A Virus In Vitro and In Vivo. Viruses 2021; 13:v13020278. [PMID: 33670217 PMCID: PMC7916974 DOI: 10.3390/v13020278] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/02/2021] [Accepted: 02/09/2021] [Indexed: 11/16/2022] Open
Abstract
Influenza A virus is a highly variable and contagious respiratory pathogen that can cause annual epidemics and it poses an enormous threat to public health. Therefore, there is an urgent need for a new generation of antiviral drugs to combat the emergence of drug-resistant strains of the influenza virus. A novel series of butene lactone derivatives were screened and the compound 3D was selected, as it exhibited in vitro potential antiviral activity against A/Weiss/43 H1N1 virus with low toxicity. In addition, 3D dose-dependently inhibited the viral replication, expression of viral mRNA and viral proteins. 3D exerted a suppressive effect on A/Virginia/ATCC2/2009 H1N1 and A/California/2/2014 H3N2 in vitro. The time-of-addition analysis indicated that 3D suppressed H1N1 in the early stage of its life cycle. A/Weiss/43 H1N1-induced apoptosis in A549 cells was reduced by 3D via the mitochondrial apoptosis pathway. 3D could decrease the production of H1N1-induced pro-inflammatory cytokines that are induced by H1N1 in vitro and in vivo. The administration of 3D reduced lung lesions and virus load in vivo. These results suggest that 3D, which is a butene lactone derivative, is a promising agent for the treatment of influenza A virus infection.
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8
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Xia C, Wang DC, Qu GR, Guo HM. Palladium-catalyzed asymmetric allylic amination of a vinylethylene carbonate with N-heteroaromatics. Org Chem Front 2021. [DOI: 10.1039/d1qo00272d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly enantioselective allylic amination of a vinylethylene carbonate with N-heteroaromatics is enabled by asymmetric palladium catalysis for the synthesis of chiral acyclic nucleosides and isonucleosides.
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Affiliation(s)
- Chao Xia
- School of Environment
- Henan Normal University
- Xinxiang
- China
| | - Dong-Chao Wang
- NMPA Key Laboratory for Research and Evaluation of Innovative Drug
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- School of Chemistry and Chemical Engineering
| | - Gui-Rong Qu
- NMPA Key Laboratory for Research and Evaluation of Innovative Drug
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- School of Chemistry and Chemical Engineering
| | - Hai-Ming Guo
- School of Environment
- Henan Normal University
- Xinxiang
- China
- NMPA Key Laboratory for Research and Evaluation of Innovative Drug
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9
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Xia C, Wang D, Guo H. Sc(OTf)3-Catalyzed Reaction of Purines with o-Hydroxybenzyl Alcohols for Construction of Acyclic Nucleosides. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202106010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Baghery S, Zarei M, Zolfigol MA, Mallakpour S, Behranvand V. Application of trityl moieties in chemical processes: part I. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2020. [DOI: 10.1007/s13738-020-01980-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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11
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Therapeutic Perspective of Vitamin C and Its Derivatives. Antioxidants (Basel) 2019; 8:antiox8080247. [PMID: 31357509 PMCID: PMC6721080 DOI: 10.3390/antiox8080247] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 07/18/2019] [Accepted: 07/20/2019] [Indexed: 01/03/2023] Open
Abstract
l-Ascorbic acid (ASA), vitamin C, is a ubiquitous carbohydrate-like compound that has an essential role in a number of cellular processes, such as collagen synthesis, cellular oxidation, and various hydroxylation reactions. ASA is a biomolecule of critical importance for protection of cellular components against oxidative damage caused by toxic free radicals and other reactive oxygen species (ROS) that are involved in the development of various types of chronic diseases. Vitamin C has a switchover role from being an antioxidant in physiological conditions to a prooxidant under pathologic conditions. Moreover, some l-ascorbic acid derivatives exhibit strong and selective antitumor and antiviral activity. This review emphasizes the advances on diverse and potent biological profiles of l-ascorbic acid and its derivatives, and their perspective in the development of new bioactive chemical entities in the future. The work is primarily addressed at antioxidant, anticancer, and antiviral potencies of l-ascorbic acid and compounds containing its butenolide structural motif.
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12
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Jones DJ, O'Leary EM, O'Sullivan TP. An improved synthesis of adefovir and related analogues. Beilstein J Org Chem 2019; 15:801-810. [PMID: 30992729 PMCID: PMC6444443 DOI: 10.3762/bjoc.15.77] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 03/18/2019] [Indexed: 12/12/2022] Open
Abstract
An improved synthesis of the antiviral drug adefovir is presented. Problems associated with current routes to adefovir include capricious yields and a reliance on problematic reagents and solvents, such as magnesium tert-butoxide and DMF, to achieve high conversions to the target. A systematic study within our laboratory led to the identification of an iodide reagent which affords higher yields than previous approaches and allows for reactions to be conducted up to 10 g in scale under milder conditions. The use of a novel tetrabutylammonium salt of adenine facilitates alkylations in solvents other than DMF. Additionally, we have investigated how regioselectivity is affected by the substitution pattern of the nucleobase. Finally, this chemistry was successfully applied to the synthesis of several new adefovir analogues, highlighting the versatility of our approach.
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Affiliation(s)
- David J Jones
- School of Chemistry, University College Cork, Cork, Ireland.,Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland.,School of Pharmacy, University College Cork, Cork, Ireland
| | - Eileen M O'Leary
- Department of Physical Sciences, Cork Institute of Technology, Cork, Ireland
| | - Timothy P O'Sullivan
- School of Chemistry, University College Cork, Cork, Ireland.,Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland.,School of Pharmacy, University College Cork, Cork, Ireland
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13
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Guillon R, Rahimova R, Preeti, Egron D, Rouanet S, Dumontet C, Aghajari N, Jordheim LP, Chaloin L, Peyrottes S. Lead optimization and biological evaluation of fragment-based cN-II inhibitors. Eur J Med Chem 2019; 168:28-44. [DOI: 10.1016/j.ejmech.2019.02.040] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 01/21/2019] [Accepted: 02/10/2019] [Indexed: 11/28/2022]
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14
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Lacbay CM, Menni M, Bernatchez JA, Götte M, Tsantrizos YS. Pharmacophore requirements for HIV-1 reverse transcriptase inhibitors that selectively "Freeze" the pre-translocated complex during the polymerization catalytic cycle. Bioorg Med Chem 2018; 26:1713-1726. [PMID: 29478802 DOI: 10.1016/j.bmc.2018.02.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 02/06/2018] [Accepted: 02/13/2018] [Indexed: 12/20/2022]
Abstract
Reverse transcriptase (RT) is responsible for replicating the HIV-1 genome and is a validated therapeutic target for the treatment of HIV infections. During each cycle of the RT-catalyzed DNA polymerization process, inorganic pyrophosphate is released as the by-product of nucleotide incorporation. Small molecules were identified that act as bioisosteres of pyrophosphate and can selectively freeze the catalytic cycle of HIV-1 RT at the pre-translocated stage of the DNA- or RNA-template-primer-enzyme complex.
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Affiliation(s)
- Cyrus M Lacbay
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
| | - Michael Menni
- Department of Biochemistry, McGill University, 3655 Sir William Osler Promenade, Montreal, Quebec H3G1Y6, Canada
| | - Jean A Bernatchez
- Department of Biochemistry, McGill University, 3655 Sir William Osler Promenade, Montreal, Quebec H3G1Y6, Canada
| | - Matthias Götte
- Department of Medical Microbiology and Immunology, University of Alberta, 6-020 Katz Group Centre, Edmonton, Alberta T6G 2E1, Canada; Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, Quebec H3A 2B4, Canada
| | - Youla S Tsantrizos
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada; Department of Biochemistry, McGill University, 3655 Sir William Osler Promenade, Montreal, Quebec H3G1Y6, Canada.
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15
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Buyens DMS, Mangondo P, Cukrowski I, Pilcher LA. Solvent-directed Regioselective Benzylation of Adenine: Characterization of N9-benzyladenine and N3-benzyladenine. J Heterocycl Chem 2017. [DOI: 10.1002/jhet.2894] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dominique M. S. Buyens
- Department of Chemistry, Faculty of Natural and Agricultural Sciences; University of Pretoria; Lynnwood Road Hatfield Pretoria 0002 South Africa
| | - Paidamwoyo Mangondo
- Department of Chemistry, Faculty of Natural and Agricultural Sciences; University of Pretoria; Lynnwood Road Hatfield Pretoria 0002 South Africa
| | - Ignacy Cukrowski
- Department of Chemistry, Faculty of Natural and Agricultural Sciences; University of Pretoria; Lynnwood Road Hatfield Pretoria 0002 South Africa
| | - Lynne A. Pilcher
- Department of Chemistry, Faculty of Natural and Agricultural Sciences; University of Pretoria; Lynnwood Road Hatfield Pretoria 0002 South Africa
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16
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Affiliation(s)
- Shuai Chen
- Medicinal Chemsitry Department, Amgen, Inc., 360 Binney Street, Cambridge, Massachusetts 02142, United States
| | - Russell F. Graceffa
- Medicinal Chemsitry Department, Amgen, Inc., 360 Binney Street, Cambridge, Massachusetts 02142, United States
| | - Alessandro A. Boezio
- Medicinal Chemsitry Department, Amgen, Inc., 360 Binney Street, Cambridge, Massachusetts 02142, United States
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17
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Aarhus TI, Fritze UF, Hennum M, Gundersen LL. Sodium borohydride mediated reduction of N-Boc protected purines and applications in the synthesis of 7-alkyladenines and tetrahydro[1,4]diazepino-[1,2,3-gh]purines. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.08.102] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Kinali-Demirci S, İdil Ö, Dişli A. Synthesis of some novel purine derivatives incorporating tetrazole ring and investigation of their antimicrobial activity and DNA interactions. Med Chem Res 2014. [DOI: 10.1007/s00044-014-1209-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Váňa L, Vrzal L, Dvořáková H, Himl M, Linhart I. Direct Arylation of Adenine by Fluoro- and Chloronitrobenzenes: Effect of Microwaves. SYNTHETIC COMMUN 2014. [DOI: 10.1080/00397911.2013.831902] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Roux L, Priet S, Payrot N, Weck C, Fournier M, Zoulim F, Balzarini J, Canard B, Alvarez K. Ester prodrugs of acyclic nucleoside thiophosphonates compared to phosphonates: synthesis, antiviral activity and decomposition study. Eur J Med Chem 2013; 63:869-81. [PMID: 23603046 DOI: 10.1016/j.ejmech.2013.02.039] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Revised: 01/30/2013] [Accepted: 02/26/2013] [Indexed: 12/25/2022]
Abstract
9-[2-(Thiophosphonomethoxy)ethyl]adenine [S-PMEA, 8] and (R)-9-[2-(Thiophosphonomethoxy)propyl]adenine [S-PMPA, 9] are acyclic nucleoside thiophosphonates we described recently that display the same antiviral spectrum (DNA viruses) as approved and potent phosphonates PMEA and (R)-PMPA. Here, we describe the synthesis, antiviral activities in infected cell cultures and decomposition study of bis(pivaloyloxymethoxy)-S-PMEA [Bis-POM-S-PMEA, 13] and bis(isopropyloxymethylcarbonyl)-S-PMPA [Bis-POC-S-PMPA, 14] as orally bioavailable prodrugs of the S-PMEA 8 and S-PMPA 9, in comparison to the equivalent "non-thio" derivatives [Bis-POM-PMEA, 11] and [Bis-POC-PMPA, 12]. Compounds 11, 12, 13 and 14 were evaluated for their in vitro antiviral activity against HIV-1-, HIV-2-, HBV- and a broad panel of DNA viruses, and found to exhibit moderate to potent antiviral activity. In order to determine the decomposition pathway of the prodrugs 11, 12, 13 and 14 into parent compounds PMEA, PMPA, 8 and 9, kinetic data and decomposition pathways in several media are presented. As expected, bis-POM-S-PMEA 13 and bis-POC-S-PMPA 14 behaved as prodrugs of S-PMEA 8 and S-PMPA 9. However, thiophosphonates 8 and 9 were released very smoothly in cell extracts, in contrast to the release of PMEA and PMPA from "non-thio" prodrugs 11 and 12.
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Affiliation(s)
- Loïc Roux
- Laboratoire d'Architecture et Fonction des Macromolécules Biologiques, UMR CNRS 7257, Equipe Chimie Médicinale et Virologie Structurale, Université Aix-Marseille, Parc scientifique de Luminy, 163 av. de Luminy, 13288 Marseille Cedex 9, France
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Lebraud H, Cano C, Carbain B, Hardcastle IR, Harrington RW, Griffin RJ, Golding BT. Trifluoroethanol solvent facilitates selective N-7 methylation of purines. Org Biomol Chem 2013; 11:1874-8. [PMID: 23381666 DOI: 10.1039/c3ob27473j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Purines protected at N-9 by p-methoxybenzyl are methylated or ethylated in 2,2,2-trifluoroethanol at N-7 by trimethyl- or triethyl-oxonium borofluorate, respectively. Subjecting the resulting cationic species to microwave irradiation releases an N(7)-methyl- or ethyl-purine. This one-pot procedure is an efficient regiospecific method applicable to diverse substrates.
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Affiliation(s)
- Honorine Lebraud
- Newcastle Cancer Centre, Northern Institute for Cancer Research, School of Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
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Regioselective and efficient synthesis of N 7-substituted adenines, guanines, and 6-mercaptopurines. MONATSHEFTE FUR CHEMIE 2013. [DOI: 10.1007/s00706-012-0899-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Structural basis of DNA ligase IV-Artemis interaction in nonhomologous end-joining. Cell Rep 2012; 2:1505-12. [PMID: 23219551 DOI: 10.1016/j.celrep.2012.11.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 11/05/2012] [Accepted: 11/09/2012] [Indexed: 01/01/2023] Open
Abstract
DNA ligase IV (LigIV) and Artemis are central components of the nonhomologous end-joining (NHEJ) machinery that is required for V(D)J recombination and the maintenance of genomic integrity in mammalian cells. We report here crystal structures of the LigIV DNA binding domain (DBD) in both its apo form and in complex with a peptide derived from the Artemis C-terminal region. We show that LigIV interacts with Artemis through an extended hydrophobic surface. In particular, we find that the helix α2 in LigIV-DBD is longer than in other mammalian ligases and presents residues that specifically interact with the Artemis peptide, which adopts a partially helical conformation on binding. Mutations of key residues on the LigIV-DBD hydrophobic surface abolish the interaction. Together, our results provide structural insights into the specificity of the LigIV-Artemis interaction and how the enzymatic activities of the two proteins may be coordinated during NHEJ.
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Concise access to N9-mono-, N2-mono- and N2,N9-di-substituted guanines via efficient Mitsunobu reactions. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.03.118] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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25
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Fletcher S. Regioselective alkylation of the exocyclic nitrogen of adenine and adenosine by the Mitsunobu reaction. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.03.103] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Zink CN, Soissons N, Fishbein JC. Products of the Direct Reaction of the Diazonium Ion of a Metabolite of the Carcinogen N-Nitrosomorpholine with Purines of Nucleosides and DNA. Chem Res Toxicol 2010; 23:1223-33. [PMID: 20443589 DOI: 10.1021/tx100093a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Charles N. Zink
- Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21228
| | - Nicolas Soissons
- Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21228
| | - James C. Fishbein
- Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21228
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Wang JT, Xia Q, Zheng XH, Chen HY, Chao H, Mao ZW, Ji LN. An effective approach to artificial nucleases using copper(ii) complexes bearing nucleobases. Dalton Trans 2010; 39:2128-36. [DOI: 10.1039/b915392f] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Jarchow-Choy SK, Sjuvarsson E, Sintim HO, Eriksson S, Kool ET. Nonpolar nucleoside mimics as active substrates for human thymidine kinases. J Am Chem Soc 2009; 131:5488-94. [PMID: 20560637 PMCID: PMC2891540 DOI: 10.1021/ja808244t] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We describe the use of nonpolar nucleoside analogues of systematically varied size and shape to probe the mechanisms by which the two human thymidine kinases (TK1 and TK2) recognize and phosphorylate their substrate, thymidine. Comparison of polar thymidine with a nonpolar isostere, 2,4-difluorotoluene deoxyriboside, as substrates for the two enzymes establishes that TK1 requires electrostatic complementarity to recognize the thymine base with high efficiency. Conversely, TK2 does not and phosphorylates the hydrophobic shape mimic with efficiency nearly the same as the natural substrate. To test the response to nucleobase size, thymidine-like analogues were systematically varied by replacing the 2,4 substituents on toluene with hydrogen and the halogen series (H, F, Cl, Br, I). Both enzymes showed a distinct preference for substrates having the natural size. To examine the shape preference, we prepared four mono- and difluorotoluene deoxyribosides with varying positions of substitutions. While TK1 did not accept these nonpolar analogues as substrates, TK2 did show varying levels of phosphorylation of the shape-varied set. This latter enzyme preferred toluene nucleoside analogues having steric projections at the 2 and 4 positions, as is found in thymine, and strongly disfavored substitution at the 3-position. Steady-state kinetics measurements showed that the 4-fluoro compound (7) had an apparent V(max)/K(m) value within 14-fold of the natural substrate, and the 2,4-difluoro compound (1), which is the closest isostere of thymidine, had a value within 2.5-fold. The results establish that nucleoside recognition mechanisms for the two classes of enzymes are very different. On the basis of these data, nonpolar nucleosides are likely to be active in the nucleotide salvage pathway in human cells, suggesting new designs for future bioactive molecules.
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Affiliation(s)
| | | | - Herman O. Sintim
- Department of Chemistry, Stanford University, Stanford, CA 94305
| | | | - Eric T. Kool
- Department of Chemistry, Stanford University, Stanford, CA 94305
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8-Bromo-9-alkyl adenine derivatives as tools for developing new adenosine A2A and A2B receptors ligands. Bioorg Med Chem 2009; 17:2812-22. [DOI: 10.1016/j.bmc.2009.02.030] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2008] [Revised: 02/13/2009] [Accepted: 02/17/2009] [Indexed: 11/23/2022]
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30
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Ashry ESHE, Kassem AA, Abdel-Hamid H, Louis FF, Khattab SAN, Aouad MR. Novel regioselective formation of S- and N-hydroxyl-alkyls of 5-(3-chlorobenzo[b]thien-2-yl)-3-mercapto-4H-1,2,4-triazole and a facile synthesis of triazolo-thiazoles and thiazolo-triazoles. Role of catalyst and microwave. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2007; 26:437-51. [PMID: 17578742 DOI: 10.1080/15257770701426187] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Regioselective alkylation of 5-(3-chlorobenzo[b]thien-2-yl)-4H-1,2,4-triazole (1) with hydroxy alkylating agents 2, 3, 13, and the 2,3-O-isopropylidene-1-O-(p-tolylsulfonyl)-glycerol (10) afforded the corresponding S-alkylated derivatives 6, 7, 11, and 14 under both conventional and microwave irradiation conditions; bentonite as a solid support gave better results, with no change in regioselectivity. A facile intramolecular dehydrative ring closure of 6, 7, 11, and 14 using K(2)CO(3) in DMF afforded the corresponding fused triazolo-thiazines and thiazolo-triazole 17-19. The isopropylidenes and acetyl derivatives of the products were prepared.
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Affiliation(s)
- E S H El Ashry
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt.
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Kotian PL, Kumar VS, Lin TH, El-Kattan Y, Ghosh A, Wu M, Cheng X, Bantia S, Babu YS, Chand P. An efficient synthesis of acyclic N7- and N9-adenine nucleosides via alkylation with secondary carbon electrophiles to introduce versatile functional groups at the C-1 position of acyclic moiety. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2006; 25:121-40. [PMID: 16541957 DOI: 10.1080/15257770500446816] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The introduction of versatile functional groups, allyl and ester, at the C-1 position of the acyclic chain in acyclic adenine nucleosides was achieved for the first time directly by alkylation of adenine and N6-potected adenine. Thus, the C-1'-substituted N9-adenine acyclic nucleoside, adenine-9-yl-pent-4-enoic acid ethyl ester (11), was prepared by direct alkylation of adenine with 2-bromopent-4-enoic acid ethyl ester (6), while the corresponding N7-regioisomer, 2-[6-(dimethylaminomethyleneamino)-purin-7-yl]-pent-4-enoic acid ethyl ester (10), was obtained in one step by the coupling of N, N-dimethyl-N'- (9H-purin-6-yl)-formamidine (9) with 2-bromopent-4-enoic acid ethyl ester (6). The functional groups, ester and allyl, were converted to the desired hydroxymethyl and hydroxyethyl groups, and subsequently to phosphonomethyl derivatives and corresponding pyrophosphorylphosphonates.
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Affiliation(s)
- Pravin L Kotian
- BioCryst Pharmaceuticals, Inc., Birmingham, Alabama 35244, USA
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Qu G, Han S, Zhang Z, Geng M, Xue F. Microwave-assisted regioselective synthesis of acyclic nucleosides through an alkylating reaction with 2-oxa-1,4-butanediol diacetate. CAN J CHEM 2006. [DOI: 10.1139/v06-061] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An efficient and green procedure for the synthesis of purine acyclic nucleosides through microwave-assisted alkylation of various purine nucleobases with 2-oxa-1,4-butanediol diacetate in the absence of solvent and catalyst is described. The advantages of using this method include its environmental friendliness, simple manipulation, short reaction time, high regioselectivity, and good yields.Key words: acyclic nucleosides, microwave irradiation, regioselectivity, alkylation, 2-oxa-1,4-butanediol diacetate.
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Brel V, Belsky V, Stash A, Zavodnik V, Stang P. Synthesis and Molecular Structure of New Unsaturated Analogues of Nucleotides Containing Six-Membered Rings. European J Org Chem 2005. [DOI: 10.1002/ejoc.200400523] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Grote M, Noll S, Noll B, Johannsen B, Kraus W. Syntheses of novel modified acyclic purine and pyrimidine nucleosides as potential substrates of herpes simplex virus type-1 thymidine kinase for monitoring gene expression. CAN J CHEM 2004. [DOI: 10.1139/v04-005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Suicide gene therapy with the herpes simplex virus type-1 thymidine kinase gene (HSV-1 tk) is considered to be a promising approach to the treatment of cancer. Making use of the lower specificity of the viral enzyme compared to human thymidine kinase, the therapy involves the administration of antiviral agents (e.g., ganciclovir) as prodrugs to induce enzymatic cell death in those cells that express the transferred gene. 18F-labelled derivatives have been described for monitoring location, duration, and magnitude of the viral kinase enzyme activity by positron emission tomography (PET). Since an optimal radiotracer has not been developed, novel substances were synthesized for monitoring gene expression. A group of 13 nucleoside analogues were synthesized, among them N1-methyl-9-[(1,3-dihydroxy-2-propoxy)methyl]guanine (5) and N1-methyl-9-[(4-hydroxy)-3-hydroxymethylbutyl]guanine (7) as methyl analogues of ganciclovir and penciclovir and their related fluoro compounds (6, 8). Further novel derivatives include N6-methyl-9-[(1,3-dihydroxy-2-propoxy)methyl]-, N6-methyl-9-[(4-hydroxy)-3-hydroxymethylbutyl]adenine (9, 10), as well as the uracil derivatives 5-hydroxy-1-[(1,3-dihydroxy-2-propoxy)methyl]uracil (11), 6-methyl-1-[(1,3-dihydroxy-2-propoxy)-methyl]uracil (12), and its 3-fluoro-derivative (13).Key words: fluorinated nucleoside analogues, gene therapy, PET, thymidine kinase.
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Carvalho MA, Zaki MEA, Alvares Y, Proença MF, Booth BL. Synthesis of novel 6-enaminopurines. Org Biomol Chem 2004; 2:2340-5. [PMID: 15305216 DOI: 10.1039/b406806h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two different approaches have been used for the synthesis of 6-enaminopurines 6 from 5-amino-4-cyanoformimidoyl imidazoles. In the first approach imidazoles 1 were reacted with ethoxymethylenemalononitrile or ethoxymethylenecyanoacetate under mild experimental conditions and this led to 9-substituted-6-(1-amino-2,2-dicyanovinyl) purines 6a-f or 9-substituted-6-(1-amino-2-cyano-2-methoxycarbonylvinyl) purines 6g-k. These reactions are postulated to occur through an imidazo-pyrrolidine intermediate 7, which rapidly rearranges to the 6-enaminopurine 6. In the second approach 6-methoxyformimidoyl purines 3, prepared in two efficient steps from 5-amino-4-cyanoformimidoyl imidazoles 1, were reacted with malononitrile and methylcyanoacetate with a mild acid catalysis (ammonium acetate or piperidinium acetate) to give 6-enaminopurines 6a, 6d, 6f, 6g and 6k in very good yields. Only low yields were obtained for the 6-enaminopurine 6j, as competing nucleophilic attack on C-8 of either 3d or 6jcauses ring opening with formation of pyrimido-pyrimidines 11 and 10a respectively.
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Affiliation(s)
- M Alice Carvalho
- Departamento de Química, Universidade do Minho, Campus de Gualtar, 4710-057, Braga, Portugal
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Moosavi-Movahedi AA, Hakimelahi S, Chamani J, Khodarahmi GA, Hassanzadeh F, Luo FT, Ly TW, Shia KS, Yen CF, Jain ML, Kulatheeswaran R, Xue C, Pasdar M, Hakimelahi GH. Design, synthesis, and anticancer activity of phosphonic acid diphosphate derivative of adenine-containing butenolide and its water-soluble derivatives of paclitaxel with high antitumor activity. Bioorg Med Chem 2003; 11:4303-13. [PMID: 13129566 DOI: 10.1016/s0968-0896(03)00524-8] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Synthesis of adenine derivative of triphosphono-gamma-(Z)-ethylidene-2,3-dimethoxybutenolide 4 was accomplished by treatment of phosphonate 3 with 5-phosphoribosyl 1-pyrophosphate in the presence of 5-phosphoribosyl 1-pyrophosphate synthetase. It was found that triphosphonate 4 functions as an irreversible stoichiometric inactivator of the Escherichia coli ribonucleoside diphosphate reductase (RDPR). Triphosphonate 4 exhibited potent inhibitory activity against murine leukemias (L1210 and P388), breast carcinoma (MCF7), and human T-lymphoblasts (Molt4/C8 and CEM/0) cell lines. Paclitaxel ester derivatives of adenine-containing triphosphono-gamma-(Z)-ethylidene-2,3-dimethoxybutenolide 8-10 were also synthesized. Like triphosphonate 4, compound 8 exhibited inhibitory property toward RDPR. It also induced microtubule assembly similar to paclitaxel (5). The structure of the chlorodiester linker in 8 was found to account for this dual property. After treatment of MCF7 cells with compounds 4, 5, and 8, fluorescence microscope examination demonstrated the presence of nucleus shrinkage or segmentation. Bifunctional prodrug 8 exhibited higher lipophilicity than 4 and higher water-solubility than 5. Pro-dual-drug 8 exhibited more pronounced anticancer activity relative to that of the triphosphonate 4 and paclitaxel (5). In contrast, compound 9, resulting from the linkage of triphosphonate 4 and paclitaxel (5) through a diester unit, was only found to function as a highly water-soluble prodrug for paclitaxel (5). It induced microtubule assembly in vitro, but did not show inhibitory property toward RDPR. On the other hand, compound 10, an aggregate of triphosphonate 4 and paclitaxel (5), neither functioned as an inhibitor of RDPR nor exhibited microtubule assembly stimulating activity in vitro.
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