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Hřebabecký H, Dejmek M, Dračínský M, Šála M, Leyssen P, Neyts J, Kaniaková M, Krůšek J, Nencka R. Synthesis of novel azanorbornylpurine derivatives. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.11.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Design, synthesis, and biological evaluation of novel coxsackievirus B3 inhibitors. Bioorg Med Chem 2010; 18:4374-84. [PMID: 20576576 DOI: 10.1016/j.bmc.2010.04.081] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 04/21/2010] [Accepted: 04/25/2010] [Indexed: 11/21/2022]
Abstract
The synthesis and SAR study of a novel class of coxsackievirus B3 (CVB3) inhibitors are reported. These compounds could be considered as the 6-chloropurines substituted at position 9 with variously substituted bicyclic scaffolds (bicyclo[2.2.1]heptane/ene-norbornane or norbornene). The synthesis and biological evaluation of 31 target compounds are described. Several of the analogues inhibited CVB3 in the low micromolar range (0.66-2muM). Minimal or no cytotoxicity was observed.
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Šála M, Hřebabecký H, Dračínský M, Masojídková M, De Palma AM, Neyts J, Holý A. Synthesis of novel racemic carbocyclic nucleosides derived from 5,6-disubstituted norbornene. ACTA ACUST UNITED AC 2009. [DOI: 10.1135/cccc2009116] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Novel class of the carbocyclic nucleosides based on bicyclo[2.2.1]heptene/heptane was prepared by two approaches. Thymine analogues were synthesized starting from methyl (1R*,4S*)-bicyclo[2.2.1]hepta-2,5-diene-2-carboxylate1by Michael addition of the thymine salt to the double bond as the key step. The yield and ratio of the isomers of this reaction depended on the used base (DBU, K2CO3). Purine nucleoside analogues were synthesized by the linear synthesis, the purine nucleobase was build-up on the amino group. The amino groups (exo/endoconfiguration) were introduced to the scaffold by the Curtius rearrangement. Norbornene analogues were converted to saturated andcis-hydroxylated nucleoside derivatives. [(1R*,2S*,3S*,4S*)-3-(6-Chloro-9H-purin-9-yl)bicyclo[2.2.1]hept-5-en-2-yl]methanol (13a) and [(1R*,2R*,3R*,4S*)-3-(6-chloro-9H-purin-9-yl)bicyclo[2.2.1]hept-5-en-2-yl]methanol (13b) showed moderate activity againstCoxsackievirus CVB3.
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Šála M, Hřebabecký H, Dračínský M, Masojídková M, De Palma AM, Neyts J, Holý A. Norbornane as the novel pseudoglycone moiety in nucleosides. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.09.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hřebabecký H, Dračínský M, De Palma AM, Neyts J, Holý A. Synthesis of novel carbocyclic nucleoside analogues derived from 7-oxabicyclo[2.2.1]heptane-2-methanol. ACTA ACUST UNITED AC 2009. [DOI: 10.1135/cccc2008204] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Hydroboration of [(1R*,2R*,4R*)-7-oxabicyclo[2.2.1]hept-5-en-2-yl]methyl benzoate (5), which was prepared by Diels–Alder reaction of furan with acrolein and subsequent reduction and benzoylation of the Diels–Alder product, afforded [(1R*,2S*,4S*,6S*)-6-hydroxy-7-oxabicyclo[2.2.1]heptan-2-yl]methyl benzoate (6) and [(1R*,2R*,4R*,5S*)-5-hydroxy-7-oxabicyclo[2.2.1]heptan-2-yl]methyl benzoate (7). The key intermediates, [(1R*,2S*,4S*,6R*)-6-hydroxy-7-oxabicyclo[2.2.1]heptan-2-yl]methyl benzoate (10) and [(1R*,2R*,4R*,5R*)-5-hydroxy-7-oxabicyclo[2.2.1]heptan-2-yl]methyl benzoate (11), were prepared from6and7, respectively, by oxidation with pyridinium dichromate and subsequent reduction of the thus obtained ketones. The Mitsunobu reaction of10and11with 6-chloropurine and subsequent reductive deprotection with diisobutylaluminium hydride afforded 6-chloropurine derivatives, which were converted to other purine analogues. Thymine analogues were prepared by Mitsunobu reaction of10and11with 3-benzoyl-5-methylpyrimidine-2,4(1H,3H)-dione and subsequent methanolysis. The target compounds were tested for the activity againstCoxsackievirus.
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Hřebabecký H, Dračínský M, De Palma AM, Neyts J, Holý A. Synthesis of novel racemic carbocyclic nucleoside analogues derived from 4,8-dioxatricyclo[4.2.1.03,7]nonane-9-methanol and 4-oxatricyclo[4.3.1.03,7]decane-10-methanol, compounds with activity against Coxsackie viruses. ACTA ACUST UNITED AC 2009. [DOI: 10.1135/cccc2008193] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
(1R*,2R*,3R*,4S*)-7-Oxabicyclo[2.2.1]hept-5-ene-2,3-dimethanol (10) and (1R*,2R*,3R*,4S*)-bicyclo[2.2.2]oct-5-ene-2,3-dimethanol (14), which were prepared by the Diels–Alder reaction and subsequent reduction with lithium aluminium hydride, were treated with benzyl azidoformate to give benzylN-[(1R*,2R*,3S*,6S*,7S*,9S*)-9-(hydroxymethyl)-4,8-dioxatricyclo[4.2.1.03,7]nonan-2-yl]carbamate (11) and benzylN-[(1R*,2R*,3R*,6R*,7S*,10S*)-10-(hydroxymethyl)-4-oxatricyclo[4.3.1.03,7]decan-2-yl]carbamate (15). Hydrogenolysis of carbamates11or15afforded (1R*,2R*,3S*,6S*,7S*,9S*)-2-amino-4,8-dioxatricyclo[4.2.1.03,7]nonane-9-methanol (12) or (1R*,2R*,3R*,6R*,7S*,10S*)-2-amino-4-oxatricyclo[4.3.1.03,7]decane-10-methanol (16). The amines12and16were transformed to thymine and purine nucleoside analogues. The target compounds were tested for the activity againstCoxsackievirus.
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Hřebabecký H, Dračínský M, Holý A. Synthesis of Novel Carbocyclic Nucleoside Analogues Containing Bicyclo[2.2.1]hept-2-ene-2-methanol. ACTA ACUST UNITED AC 2008. [DOI: 10.1135/cccc20080044] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Starting ethyl (1R*,2R*,3R*,4S*)-3-bromobicyclo[2.2.1]hept-5-ene-2-carboxylate (9) was reduced with LiAlH4and benzoylated giving [(1R*,2R*,3R*,4S*)-3-bromobicyclo[2.2.1]hept-5-en-2-yl]methyl benzoate (11). Treatment of11with NaN3and CrO3in acetic acid afforded [(1R*,2S*,3R*,4R*,5S*,6R*)-6-azido-3-bromo-5-hydroxybicyclo[2.2.1]hept-2-yl]methyl benzoate (12a) and [(1R*,2S*,3S*,4R*,5S*,6R*)-5-azido-3-bromo-6-hydroxybicyclo[2.2.1]heptan-2-yl]-methyl benzoate (12b). These key intermediates were separated and converted in five reaction steps to (1R*,2R*,3S*,4S*)-3-[(5-amino-6-chloropyrimidin-4-yl)amino]-5-(hydroxymethyl)- bicyclo[2.2.1]hept-5-en-2-ol (17a) and (1R*,2R*,3S*,4S*)-3-[(5-amino-6-chloropyrimidin-4-yl)- amino]-6-(hydroxymethyl)bicyclo[2.2.1]hept-5-en-2-ol (17b). Ring closure with triethyl orthoformate led to (1R*,2R*,3S*,4S*)-5-(chloromethyl)-3-(6-chloro-9H-purin-9-yl)bicyclo[2.2.1]hept-5-en-2-ol (18a) and (1R*,2R*,3S*,4S*)-6-(chloromethyl)-3-(6-chloro-9H-purin-9-yl)- bicyclo[2.2.1]hept-5-en-2-ol (18b) using hydrochloric acid as a catalyst or (1R*,2R*,3S*,4S*)-3-(6-chloro-9H-purin-9-yl)-5-(hydroxymethyl)bicyclo[2.2.1]hept-5-en-2-ol (19a) and (1R*,2R*,3S*,4S*)- 3-(6-chloro-9H-purin-9-yl)-6-(hydroxymethyl)bicyclo[2.2.1]hept-5-en-2-ol (19b) using trifluoro- acetic acid as a catalyst. From19aand19b, 6-amino- and 6-(cyclopropylamino)purine derivatives20and21were prepared.
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Dejmek M, Hřebabecký H, Dračínský M, Holý A. Synthesis of Novel Carbocyclic Nucleoside Analogues Derived from 2-(Hydroxymethyl)bicyclo[2.2.1]heptane. ACTA ACUST UNITED AC 2007. [DOI: 10.1135/cccc20071523] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The key intermediates, [(1R*,2R*,4R*,6R*)-6- (12a) and [(1R*,2R*,4R*,5S*)-5-(hydroxymethyl)- bicyclo[2.2.1]heptan-2-yl]methyl benzoates (12b), were prepared from (1R*,2S*,4R*)- bicyclo[2.2.1]hept-5-en-2-ylmethyl benzoate by hydroboration, oxidation with pyridinium dichromate and subsequent reduction of the thus obtained ketones. The Mitsunobu reaction of12aand12bwith 6-chloropurine afforded 6-chloropurine derivatives, which were converted into others purine analogues. Thymine analogues were prepared from [(1R*,2R*,4S*,6S*)-6- (25a) and [(1R*,2S*,4R*,5S*)-5-aminobicyclo[2.2.1]heptan-2-yl]methanols (25b), which were prepared from alcohols12aand12bin several easy steps.
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