Synthesis and Properties of 2‘-Deoxy-2‘-α-C-branched Nucleosides and Nucleotides
摘要:
Four functionalized 2'-deoxy-2'-alpha-C-branched nucleosides, namely, 2'-deoxy-2'-alpha-C-(carboxymethyl)-uridine, 2'-deoxy-2'-alpha-acetamidouridine, 2'-deoxy-2'-alpha-C-(hydroxyethyl)uridine, and 2'-deoxy-2'-alpha-C-(2,3-dihydroxypropyl)uridine, have been prepared. Conversion of these nucleosides to their appropriately protected phosphoramidites, followed by tetrazole-induced reaction with 2',3'-di-O-acetyluridine, oxidation, and subsequent deprotection furnished the corresponding dinucleoside monophosphates. During the oxidation of the amide-derived phosphite, partial dehydration occurred to give a mixture of the amide- and nitrile-containing dimers. Interestingly, the ratio of amide to nitrile could be largely controlled by choice of oxidant. The hydroxyethyl- and dihydroxypropyl-modified dimers were particularly resistant to snake venom phosphodiesterase-catalyzed hydrolysis (relative half-lives of 129 and 120, respectively, in comparison to UpU). It is anticipated that these nucleoside analogues will ultimately be used in the construction of ribozymes containing enhanced functionality and nuclease resistance.
The Synthesis of 2′-C-Functionalised Nucleosides for Incorporation into Catalytic RNA
摘要:
Five 2'-C-functionalized nucleosides (1-5) have been prepared and incorporated into dinucleoside monophosphates. The effect of the functionality on the stability of the adjacent phosphodiester bond toward hydrolysis by nuclease enzymes and extremes of pH has been assessed.
Sunthesis of functionalised 2′-C-branched nucleosides via their γ-butyrolactones
作者:Anthony J. Lawrence、John B.J. Pavey、Ian A. O'Neil、Richard Cosstick
DOI:10.1016/0040-4039(95)01226-8
日期:1995.8
Functionalised2′-C-branchednucleosides that contain either a carboxylic acid (2), a primary amide (3) or a primary hydroxyl (4) group have been prepared and their protection for oligonucleotide synthesis investigated. The 2′-C-3′-O-γ-butyrolactone (5) was also shown to be a useful intermediate for the preparation of these analogues.
已经制备了包含羧酸(2),伯酰胺(3)或伯羟基(4)的官能化的2'- C-支链核苷,并研究了它们对寡核苷酸合成的保护。还显示了2'- C- 3'- O - γ-丁内酯(5)是制备这些类似物的有用中间体。