The alpha-hydroxyamido functionality of 2'-deoxytetrahydrouridine (dTHU) makes this seemingly simple and generally useful compound difficult to obtain. Reported synthetic strategies produce extremely poor yields and multiple products, and full characterization data is not available. Described herein is a two-step approach for synthesizing dTHU in increased yields and purity; stability concerns are also addressed. Catalytic reduction (5% Rh/alumina) of 2'-deoxyuridine. followed by reduction with sodium borohydride as a limiting reagent, produces dTHU and limits formation of side products. Evidence was obtained for formation of a methoxy-substituted analogue during purification. By this strategy, dTHU of >95% purity can be obtained in 40% yield on a 150 mg scale.
Reactivity of Damaged Pyrimidines: Formation of a Schiff Base Intermediate at the Glycosidic Bond of Saturated Dihydrouridine
作者:Yajun Jian、Gengjie Lin、Lidia Chomicz、Lei Li
DOI:10.1021/ja512435j
日期:2015.3.11
favor the rupture of the C1'-O4' bond, resulting in a Schiff base intermediate at the N-glycosidic bond. Such a Schiff base intermediate was trapped and characterized by either Pd-catalyzed hydrogenation or thiol-mediated addition reaction. In contrast, in undamaged 2'-deoxyuridine and thymidine, reactions at elevated temperatures lead to the release of nucleobases most likely via the traditional oxocarbenium
DNA Damage Induced via 5,6-Dihydrothymid-5-yl in Single-Stranded Oligonucleotides
作者:Marc M. Greenberg、Mark R. Barvian、Gary P. Cook、Brian K. Goodman、Tracy J. Matray、Christopher Tronche、Hariharan Venkatesan
DOI:10.1021/ja9533510
日期:1997.2.1
5,6-Dihydrothymid-5-yl (4) is generated via Norrish type I cleavage of isopropyl ketone 7. Ketone 7 was site specifically incorporated into chemically synthesized polythymidylates and an oligonucleotide containing all four native deoxyribonucleotides. No damage is induced in oligonucleotides containing 7 upon photolysis under anaerobic conditions. In the presence of O2, strand breaks and alkaline labile
β-Selective synthesis of 2′-deoxy-5,6-dihydro-4-thiouridine, a precursor of the unstable nucleoside product of ionising radiation damage 2′-deoxy-5,6-dihydrocytidine
作者:Frédéric Peyrane、Pascale Clivio
DOI:10.1039/b502302e
日期:——
4-Thio oxathiaphosphepane nucleosides- undergo a rearrangement in pyridine that leads selectively to the beta anomer of the 2'-deoxy-5,6-dihydro-4-thiouridine derivative . This diastereoselective reaction proceeds through a multistep mechanism initiated by the addition of pyridine at the C1'position of - and concomitant opening of the oxathiaphosphepane. This was confirmed by the trapping of the corresponding
Direct Strand Scission from a Nucleobase Radical in RNA
作者:Aaron C. Jacobs、Marino J. E. Resendiz、Marc M. Greenberg
DOI:10.1021/ja100281x
日期:2010.3.24
formal C5 hydrogen atom addition product of uridine in RNA, we provide the first chemical characterization of the pathway for direct strandscission from an RNA nucleobase radical. The process is more efficient under anaerobic conditions. The preference for strandscission in double-stranded RNA over single-stranded RNA suggests that this chemistry may be useful for analyzing the secondary structure of
The present invention relates to modified nucleosides which are linked to cargo molecules and which can be incorporated by DNA or RNA polymerases in strand synthesis. The present invention also relates to use of such modified nucleosides as substrates for DNA or RNA polymerases. The present invention also relates to the use of such modified nucleosides in diagnosis and prognosis of diseases or disorders associated with a target sequence. The present invention also relates to methods for producing such modified nucleosides, kits comprising such nucleosides, and in vitro methods for diagnosing or predicting diseases or disorders associated with a target sequence. The present invention also relates to modified nucleosides for use in diagnosing, predicting or treating diseases or disorders associated with a target sequence.