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Tian M, Yu M, Shi T, Hu J, Li S, Xu J, Chen N, Du H. Silver-Catalyzed Direct C6-H Arylation of Purines and Purine Nucleosides with Arylboronic Acids. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700406] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Miao Tian
- Faculty of Science; Beijing University of Chemical Technology; 100029 Beijing People's Republic of China
| | - Mingwu Yu
- Faculty of Science; Beijing University of Chemical Technology; 100029 Beijing People's Republic of China
| | - Tingting Shi
- Faculty of Science; Beijing University of Chemical Technology; 100029 Beijing People's Republic of China
| | - Junbin Hu
- Faculty of Science; Beijing University of Chemical Technology; 100029 Beijing People's Republic of China
| | - Shunlai Li
- Faculty of Science; Beijing University of Chemical Technology; 100029 Beijing People's Republic of China
| | - Jiaxi Xu
- Faculty of Science; Beijing University of Chemical Technology; 100029 Beijing People's Republic of China
| | - Ning Chen
- Faculty of Science; Beijing University of Chemical Technology; 100029 Beijing People's Republic of China
| | - Hongguang Du
- Faculty of Science; Beijing University of Chemical Technology; 100029 Beijing People's Republic of China
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Niu HY, Su LY, Bai SX, Li JP, Feng XL, Guo HM. Synthesis of C8-alkyl-substituted purine analogues by direct alkylation of 8- H purines with tetrahydrofuran catalyzed by CoCl 2 ·6H 2 O. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2016.06.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Xia R, Niu HY, Qu GR, Guo HM. CuI Controlled C–C and C–N Bond Formation of Heteroaromatics through C(sp3)–H Activation. Org Lett 2012; 14:5546-9. [DOI: 10.1021/ol302640e] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Ran Xia
- College of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions of Ministry of Education, Henan Normal University, No. 46 Jianshe Road, Xinxiang, 453007, China, and School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, No. 1 Hualan Avenue, Xinxiang 453003, China
| | - Hong-Ying Niu
- College of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions of Ministry of Education, Henan Normal University, No. 46 Jianshe Road, Xinxiang, 453007, China, and School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, No. 1 Hualan Avenue, Xinxiang 453003, China
| | - Gui-Rong Qu
- College of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions of Ministry of Education, Henan Normal University, No. 46 Jianshe Road, Xinxiang, 453007, China, and School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, No. 1 Hualan Avenue, Xinxiang 453003, China
| | - Hai-Ming Guo
- College of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions of Ministry of Education, Henan Normal University, No. 46 Jianshe Road, Xinxiang, 453007, China, and School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, No. 1 Hualan Avenue, Xinxiang 453003, China
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Nauš P, Perlíková P, Pohl R, Hocek M. Sugar-modified derivatives of cytostatic 6-(het)aryl-7-deazapurine nucleosides: 2′-C-methylribonucleosides, arabinonucleosides and 2′-deoxy-2′-fluoroarabinonucleosides. ACTA ACUST UNITED AC 2011. [DOI: 10.1135/cccc2011082] [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
A series of novel sugar-modified derivatives of cytostatic 6-hetaryl-7-deazapurine ribonucleosides: 2′-C-methylribonucleosides, arabinonucleosides and 2′-deoxy-2′-fluoroarabinonucleosides bearing an alkyl, aryl and hetaryl group in position 6 were prepared by palladium catalyzed cross-coupling reactions of corresponding (protected) 6-chloro-(7-fluoro)-7-deazapurine nucleosides with (het)arylboronic, hetarylstannanes and trimethylaluminium eventually followed by deprotection. Key intermediate 6-chloro-7-deazapurine 2′-C-methyl-β-D-ribofuranoside was prepared via a stereoselective nucleobase anion glycosylation with toluoyl-protected 1,2-anhydro-2-C-methylribofuranose. The 1,2-anhydro sugar was synthesized in 3 steps starting from readily available 2-C-methylribonolactone. The 6-chloro-7-deazapurine arabinofuranoside intermediate was obtained by epimerization from 3′,5′-protected 6-chloro-7-deazapurine ribofuranoside via 2′-hydroxyl oxidation followed by reduction. None of the prepared compounds showed any considerable cytostatic or antiviral activity.
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Sedláček O, Břehová P, Pohl R, Holý A, Janeba Z. The synthesis of the 8-C-substituted 2,6-diamino-9-[2-(phosphonomethoxy)ethyl]purine (PMEDAP) derivatives by diverse cross-coupling reactions. CAN J CHEM 2011. [DOI: 10.1139/v11-001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Diisopropyl 8-bromo-2,6-diamino-9-[2-(phosphonomethoxy)ethyl]purine was used as a starting material for the synthesis of the 8-C-substituted 2,6-diamino-9-[2-(phosphonomethoxy)ethyl]purine (PMEDAP) analogues. A systematic screening of diverse cross-coupling reactions was carried out. Stille, Suzuki–Miyaura, Negishi, and Sonogashira cross-couplings, as well as Pd-catalysed reactions with trialkylaluminiums, were employed for the introduction of various alkyl, alkenyl, alkynyl, aryl, and hetaryl substituents to the C-8 position of the 2,6-diaminopurine moiety. In contrast to the potent parent compound PMEDAP, which exhibits potent antiretroviral and antitumor activity, none of the sixteen newly synthesized 8-C-substituted analogues of PMEDAP showed any specific antiviral activity.
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Affiliation(s)
- Ondřej Sedláček
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
| | - Petra Břehová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
| | - Antonín Holý
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
| | - Zlatko Janeba
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
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Naus P, Pohl R, Votruba I, Dzubák P, Hajdúch M, Ameral R, Birkus G, Wang T, Ray AS, Mackman R, Cihlar T, Hocek M. 6-(Het)aryl-7-deazapurine ribonucleosides as novel potent cytostatic agents. J Med Chem 2010; 53:460-70. [PMID: 19929004 DOI: 10.1021/jm901428k] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of novel 7-deazapurine ribonucleosides bearing an alkyl, aryl, or hetaryl group in position 6 and H, F, or Cl atom in position 7 has been prepared either by Pd-catalyzed cross-coupling reactions of the corresponding protected 6-chloro-(7-halogenated-)7-deazapurine ribonucleosides with alkyl- or (het)arylorganometallics followed by deprotection, or by single-step aqueous phase cross-coupling reactions of unprotected 6-chloro-(7-halogenated-)7-deazapurine ribonucleosides with (het)arylboronic acids. Significant cytostatic effect was detected with a substantial proportion of the prepared compounds. The most potent were 7-H or 7-F derivatives of 6-furyl- or 6-thienyl-7-deazapurines displaying cytostatic activity in multiple cancer cell lines with a geometric mean of 50% growth inhibition concentration ranging from 16 to 96 nM, a potency comparable to or better than that of the nucleoside analogue clofarabine. Intracellular phosphorylation to mono- and triphosphates and the inhibition of total RNA synthesis was demonstrated in preliminary study of metabolism and mechanism of action studies.
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Affiliation(s)
- Petr Naus
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic
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Čerňa I, Pohl R, Klepetářová B, Hocek M. Synthesis of 6,8,9-Tri- and 2,6,8,9-Tetrasubstituted Purines by a Combination of the Suzuki Cross-coupling, N-Arylation, and Direct C−H Arylation Reactions. J Org Chem 2008; 73:9048-54. [DOI: 10.1021/jo8018126] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Igor Čerňa
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, CZ-16610, Prague 6, Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, CZ-16610, Prague 6, Czech Republic
| | - Blanka Klepetářová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, CZ-16610, Prague 6, Czech Republic
| | - Michal Hocek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, CZ-16610, Prague 6, Czech Republic
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Vrábel M, Hocek M, Havran L, Fojta M, Votruba I, Klepetářová B, Pohl R, Rulíšek L, Zendlová L, Hobza P, Shih IH, Mabery E, Mackman R. Purines Bearing Phenanthroline or Bipyridine Ligands and Their RuII Complexes in Position 8 as Model Compounds for Electrochemical DNA Labeling – Synthesis, Crystal Structure, Electrochemistry, Quantum Chemical Calculations, Cytostatic and Antiviral Activity. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200700030] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Capek P, Pohl R, Hocek M. Cross-coupling reactions of unprotected halopurine bases, nucleosides, nucleotides and nucleoside triphosphates with 4-boronophenylalanine in water. Synthesis of (purin-8-yl)- and (purin-6-yl)phenylalanines. Org Biomol Chem 2006; 4:2278-84. [PMID: 16729137 DOI: 10.1039/b604010a] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
An expeditious and highly efficient single-step methodology for the introduction of a phenylalanine moiety into position 8 and 6 of the purine scaffold was developed based on aqueous-phase Pd-catalysed Suzuki-Miyaura cross-coupling reactions of unprotected 4-boronophenylalanine with 8-bromo- or 6-chloropurines. The scope of the methodology was demonstrated by syntheses of unprotected (adenin-8-yl)phenylalanine base, nucleosides, nucleotides and nucleoside triphosphates as well as (purin-6-yl)phenylalanine base and nucleosides. All these products were obtained in high yields and in optically pure form.
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Affiliation(s)
- Petr Capek
- Centre for New Antivirals and Antineoplastics, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, CZ-16610, Prague 6, Czech Republic
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Šilhár P, Pohl R, Votruba I, Klepetářová B, Hocek M. Synthesis of 6-Amino-, 6-Methyl- and 6-Aryl-2-(hydroxymethyl)purine Bases and Nucleosides. ACTA ACUST UNITED AC 2006. [DOI: 10.1135/cccc20060788] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
An efficient methodology of the synthesis of 6-substituted 2-(hydroxymethyl)purine derivatives (bases and nucleosides) was developed. Regioselective Pd-catalyzed cross-coupling reactions of 6-chloro-2-iodopurines with [(benzoyloxy)methyl]zinc iodide gave 2-[(benzoyloxy)-methyl]-6-chloropurines that were converted to 2-(hydroxymethyl)adenines by reactions with ammonia and to 6-methyl- or 6-aryl-2-(hydroxymethyl)purines by cross-coupling reactions with trimethylaluminium or arylboronic acids followed by deprotection. The title 6-substituted 2-(hydroxymethyl)purine bases and nucleosides did not exhibit significant cytostatic or anti-HCV activity.
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Hocek M, Naus P, Pohl R, Votruba I, Furman PA, Tharnish PM, Otto MJ. Cytostatic 6-Arylpurine Nucleosides. 6. SAR in Anti-HCV and Cytostatic Activity of Extended Series of 6-Hetarylpurine Ribonucleosides. J Med Chem 2005; 48:5869-73. [PMID: 16134952 DOI: 10.1021/jm050335x] [Citation(s) in RCA: 127] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Significant anti-HCV activity of 6-hetarylpurine ribonucleosides has been discovered and is reported here for the first time and compared with cytostatic effect. An extended series of 6-hetarylpurine nucleosides has been prepared by heterocyclizations in position 6 of purine nucleosides or by cross-couplings of 6-chloropurine nucleosides with hetarylboronic acids, -stannanes, or -zinc halides. The most anti-HCV active were purine ribonucleosides bearing pyrrol-3-yl or 2-furyl groups exerting EC(90) = 0.14 and 0.4 microM, respectively.
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Affiliation(s)
- Michal Hocek
- Centre for New Antivirals and Antineoplastics, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-16610 Prague 6, Czech Republic.
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Hocek M, Pohl R, Císařová I. Highly Methylated Purines and Purinium Salts as Analogues of Heteromines. European J Org Chem 2005. [DOI: 10.1002/ejoc.200500154] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Šilhár P, Pohl R, Votruba I, Hocek M. Synthesis of 2-Substituted 6-(Hydroxymethyl)purine Bases and Nucleosides. ACTA ACUST UNITED AC 2005. [DOI: 10.1135/cccc20051669] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A facile and efficient methodology of the synthesis of 6-(hydroxymethyl)purine derivatives (bases and nucleosides) was developed based on Pd-catalyzed cross-coupling reactions of 6-halopurines or N-protected 2-amino-6-halopurines with (benzoyloxymethyl)zinc iodide followed by deprotection. Regioselective hydroxymethylations of 2,6-dihalopurines were also studied and used for the synthesis of 2-chloro-6-(hydroxymethyl)- or 2,6-bis(hydroxymethyl)purines. The 6-(hydroxymethyl)purine ribonucleoside 5f exerted high cytostatic effect and moderate inhibition of adenosine deaminase, while all the other derivatives were much less effective or entirely inactive.
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Turek P, Kotora M, Tislerová I, Hocek M, Votruba I, Císarová I. Cocyclotrimerization of 6-Alkynylpurines with α,ω-Diynes as a Novel Approach to Biologically Active 6-Arylpurines. J Org Chem 2004; 69:9224-33. [PMID: 15609959 DOI: 10.1021/jo0486342] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Transition metal complex catalyzed cocyclotrimerization of 6-alkynylpurines 1 with various diynes enables the preparation of a plethora of substituted 6-arylpurines 3 in good yields. The most general catalyst for the reaction is a user-friendly system based on a nickel-phosphine complex and reductant (NiBr(2)(dppe)/Zn) in MeCN. The reaction conditions are compatible with various protective groups on the purine moiety (Bn, THP). As far as other potential catalysts were concerned, only CoBr(PPh(3))(3) showed reasonable activity in cocyclotrimerization of alkynylpurines with dipropargyl ether. A comparison of catalytic with stoichiometric approaches and the ligand effect in the catalyst is also given. Cytostatic activity screening of title 6-arylpurines was performed and several moderately active compounds were found.
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Affiliation(s)
- Pavel Turek
- Department of Organic and Nuclear Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic
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Nauš P, Votruba I, Hocek M. Covalent Analogues of DNA Base-Pairs and Triplets VII. Synthesis and Cytostatic Activity of Bis(purin-6-yl)acetylene and -diacetylene Nucleosides. ACTA ACUST UNITED AC 2004. [DOI: 10.1135/cccc20041955] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The title bis(purin-6-yl)acetylene and -diacetylene nucleoside derivatives were prepared as covalent base-pair analogues starting from acyl-protected 6-ethynylpurine and 6-iodopurine nucleosides by the Sonogashira cross-coupling or oxidative alkyne-dimerization reactions followed by deprotection. The key starting acyl-protected 6-ethynylpurine nucleosides were prepared by a sequence of cross-coupling reactions of protected 6-halopurine nucleosides with (trimethylsilyl)acetylene followed by a modified desilylation with TBAF in presence of acetic acid. Surprisingly, the acyl-protected nucleosides exhibited significant cytostatic activity higher than the fully deprotected title compounds.
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Hocek M, Dvoráková H. An efficient synthesis of 2-substituted 6-methylpurine bases and nucleosides by Fe- or Pd-catalyzed cross-coupling reactions of 2,6-dichloropurines. J Org Chem 2003; 68:5773-6. [PMID: 12839482 DOI: 10.1021/jo034351i] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fe-catalyzed cross-coupling reactions of 9-substituted or protected 2,6-dichloropurines with 1 equiv of methylmagnesium chloride gave regioselectively 2-chloro-6-methylpurines in good yields. The same reactions with 3 equiv of methylmagnesium chloride or Pd-catalyzed reactions with trimethylaluminum afforded 2,6-dimethylpurines. The 2-chloro-6-methylpurines underwent another coupling with phenylboronic acid to give 6-methyl-2-phenylpurines. All reactions were perfomed for Bn- and THP-protected purine bases as well as for acyl-protected ribosides and 2-deoxyribosides. After deprotection, free purine bases and nucleosides were obtained.
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Affiliation(s)
- Michal Hocek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, CZ-16610 Prague 6, Czech Republic.
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