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Mamedov VA, Zhukova NA, Gubaidullin AT, Syakaev VV, Kadyrova MS, Beschastnova TN, Bazanova OB, Rizvanov IDK, Latypov SK. One-Pot Synthesis of 7-(Benzimidazol-2-yl)thioxolumazine and -lumazine Derivatives via H 2SO 4-Catalyzed Rearrangement of Quinoxalinones When Exposed to 5,6-Diamino-2-mercapto- and 2,5,6-Triaminopyrimidin-4-ols. J Org Chem 2018; 83:14942-14953. [PMID: 30431276 DOI: 10.1021/acs.joc.8b02161] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A facile approach to a range of substituted 7-(benzimidazol-2-yl)thioxolumazines [7-(benzimidazol-2-yl)-2-thioxo-2,3-dihydropteridin-4(1 H)-ones] and 7-(benzimidazol-2-yl)lumazines [7-(benzimidazol-2-yl)pteridine-2,4(1 H,3 H)-diones] is described. These new biheterocyclic systems are obtained via H2SO4-catalyzed rearrangement of quinoxalin-2-ones in the presence of 5,6-diamino-2-mercapto- and 2,5,6-triaminopyrimidin-4-ols. Thus, benzimidazole and pteridine rings are constructed in one synthetic step. A plausible ANRORC ( addition of nucleophile, ring opening and ring closure)-type reaction mechanism is proposed. Applying the rearrangement to the aza-analogue of 3-benzoylquinoxalin-2(1 H)-one-i.e., 3-benzoylpyrido[2,3- b]pyrazin-2(1 H)-one-with 5,6-diamino-2-mercaptopyrimidin-4-ol makes it possible to synthesize inaccessible 7-(1 H-imidazo[4,5- b]pyridin-2-yl)-6-phenyl-2-thioxo-2,3-dihydropteridin-4(1 H)-one. 7-(Benzimidazol-2-yl)-6-(2-fluorophenyl)-2-thioxo-2,3-dihydropteridin-4(1 H)-ones undergoes intramolecular nucleophilic substitution of fluorine by a nitrogen of the benzimidazole fragment with the formation of benzo[4',5']imidazo[1',2':1,2]quinolino[4,3- g]pteridine-2,4(1 H,3 H)-diones as new heterocyclic systems.
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Affiliation(s)
- Vakhid A Mamedov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Nataliya A Zhukova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Aidar T Gubaidullin
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Victor V Syakaev
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Milyausha S Kadyrova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Tat'yana N Beschastnova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Olga B Bazanova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Il Dar Kh Rizvanov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
| | - Shamil K Latypov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center , Russian Academy of Sciences , Arbuzov Street 8 , 420088 Kazan , Russian Federation
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Crean CW, Camier R, Lawler M, Stevenson C, Davies RJH, Boyle PH, Kelly JM. Synthesis of N3- and 2-NH2-substituted 6,7-diphenylpterins and their use as intermediates for the preparation of oligonucleotide conjugates designed to target photooxidative damage on single-stranded DNA representing the bcr-abl chimeric gene. Org Biomol Chem 2004; 2:3588-601. [PMID: 15592617 DOI: 10.1039/b413655a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two 17-mer oligodeoxynucleotide-5'-linked-(6,7-diphenylpterin) conjugates, 2 and 3, were prepared as photosensitisers for targeting photooxidative damage to a 34-mer DNA oligodeoxynucleotide (ODN) fragment 1 representing the chimeric bcr-abl gene that is implicated in the pathogenesis of chronic myeloid leukaemia (CML). The base sequence in the 17-mer was 3'G G T A G T T A T T C C T T C T T5'. In the first of these ODN conjugates (2) the pterin was attached at its N3 atom, via a -(CH2)3OPO(OH)- linker, to the 5'-OH group of the ODN. Conjugate 2 was prepared from 2-amino-3-(3-hydroxypropyl)-6,7-diphenyl-4(3H)-pteridinone 10, using phosphoramidite methodology. Starting material 10 was prepared from 5-amino-7-methylthiofurazano[3,4-d]pyrimidine 4 via an unusual highly resonance stabilised cation 8, incorporating the rare 2H,6H-pyrimido[6,1-b][1,3]oxazine ring system. In the characterisation of 10 two pteridine phosphazenes, 15 and 29, were obtained, as well as new products containing two uncommon tricyclic ring systems, namely pyrimido[2,1-b]pteridine (20 and 24) and pyrimido[1,2-c]pteridine (27). In the second ODN conjugate the linker was -(CH2)5CONH(CH2)6OPO(OH)- and was attached to the 2-amino group of the pterin. In the preparation of 3, the N-hydroxysuccinimide ester 37 of 2-(5-carboxypentylamino)-6,7-diphenyl-4(3H)-pteridinone was condensed with the hexylamino-modified 17-mer. Excitation of 36 with near UV light in the presence of the single-stranded target 34-mer, 5'T G A C C A T C A A T A A G14 G A A G18 A A G21 C C C T T C A G C G G C C3' 1 caused oxidative damage at guanine bases, leading to alkali-labile sites which were monitored by polyacrylamide gel electrophoresis. Cleavage was observed at all guanine sites with a marked preference for cleavage at G14. In contrast, excitation of ODN-pteridine conjugate 2 in the presence of 1 caused oxidation of the latter predominantly at G18, with a smaller extent of cleavage at G15 and G14 (in the double-stranded portion) and G21. These results contrast with our previous observation of specific cleavage at G21 with ruthenium polypyridyl sensitisers, and suggest that a different mechanism, probably one involving Type 1 photochemical electron transfer, is operative. Much lower yields were found with the ODN-pteridine conjugate 3, perhaps as a consequence of the longer linker between the ODN and the pteridine in this case.
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Affiliation(s)
- Conor W Crean
- Chemistry Department and Centre for Chemical Synthesis and Chemical Biology, Trinity College, University of Dublin, Dublin 2, Ireland
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