Results 171 to 180 of about 6,161 (198)

Didesoxy-Ribonucleoside durch Schmelzkondensation

Journal f�r Praktische Chemie/Chemiker-Zeitung, 1993
Dideoxy Ribonucleosides by Fusion Method The dideoxy nucleosides 2, 4 and 6 are synthesized from the 1-O-acetyl-2,3-dideoxyribose derivatives 1, 3 and 5 by fusion with chlorinated purines and other nitrogen heterocycles at 110–120°C without added catalyst. The 1H-NMR and 13C-NMR spectra of the compounds are given.
Elke Diekmann, K. Friedrich, Hans-G�nther Fritz   +2 more
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Ribonucleoside 2′,3′-orthocarbonates

J. Chem. Soc. D, 1969
Ribonucleosides undergo acid-catalysed exchange with tetramethyl orthocarbonate to give 2′,3′-O-dimethoxymethylidene derivatives.
G. R. Niaz, C. B. Reese
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Reduction of Ribonucleosides to 2′‐Deoxyribonucleosides

Current Protocols in Nucleic Acid Chemistry, 2005
AbstractRibonucleosides are converted into 2′‐deoxyribonucleosides in good yields by a four‐step procedure. Selective protection of the 3′‐ and 5′‐hydroxyl groups with 1,3‐dichloro‐1,1,3,3‐tetraisopropyl‐1,3‐disiloxane is followed by functionalization of the 2′‐hydroxyl group with phenoxythiocarbonyl chloride.
Morris J, Robins, Stanislaw F, Wnuk
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Synthesis of 2′-O-Substituted Ribonucleosides

Nucleosides, Nucleotides and Nucleic Acids, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
V, Serebryany, L, Beigelman
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Über substituierte 2.3‐Benzyliden‐ribonucleoside

Justus Liebigs Annalen der Chemie, 1964
AbstractDie Darstellung von [4‐Dimethylamino‐benzyliden]‐ und [2.4‐Dimethoxy‐benzyliden]‐ribonucleosiden wird beschrieben. Diese Verbindungen werden rasch unter milden sauren Bedingungen hydrolysiert und lassen sich mit 2‐Cyanäthylphosphat/Dicyclohexylcarbodiimid phosphorylieren.
Friedrich Cramer, Wolfram Saenger, Karl‐Heinz Scheit, Jürgen Tennigkeit   +3 more
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Selective deacylation of peracylated ribonucleosides

Tetrahedron Letters, 2009
Abstract A protocol for chemoselective deprotection of N,O-acylated ribonucleosides has been developed. Peracylated pyrimidine ribonucleosides subjected to guanidinium nitrate and NaOMe in MeOH/CH 2 Cl 2 at 0 °C undergo high yielding O-deacylation, while even more pronounced chemoselectivity is observed with peracylated purine ribonucleosides as O5′-
Jared W. Rigoli, Michael E. Østergaard, Kirsten M. Canady, Dale C. Guenther, Patrick J. Hrdlicka   +4 more
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[18] Ribonucleoside cyclic phosphates

1967
Publisher Summary This chapter discusses ribonucleoside cyclic phosphates and their methods of preparation. Ribonucleoside cyclic phosphates refer to the 2', 3'-monophosphate esters of nucleosides. They are originally isolated as intermediates during the enzymatic or mild alkaline degradations of ribonucleic acids, and independently and ...
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2-Fluoropurine ribonucleosides

Journal of Medicinal Chemistry, 1970
J A, Montgomery, K, Hewson
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2′--acyl ribonucleoside derivatives

Tetrahedron Letters, 1965
C B, Reese, D R, Trentham
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L-ribonucleosides from L-xylose

Tetrahedron, 1999
Abstract L-Xylose was converted into a L-ribose derivative via an oxidation/reduction procedure. The L-ribosyl donor was submitted to a glycosidation reaction according to Vorbruggen's conditions to give L-ribonucleosides (L-uridine, L-cytidine, L-adenosine and L-guanosine) in high yield.
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