Es wird ein Verfahren zur Herstellung von Oligoribonucleotiden der Formel
worin n, L, BB, W, T, Y', U, C¹ und C² wie in der Beschreibung definiert sind, mittels Festphasensynthese beschrieben sowie Zwischenprodukte der Formeln
und
Nucleosides. Part LXIII. Acetals as new 2?-O-protecting functions for the synthesis of oligoribonucleotides: Synthesis of uridine building blocks and evaluation of their relative acid stability
A broad variety of new acyclic vinyl ethers (see 6–41) have been synthesized via the vinyl-interchange reaction of ethyl vinyl ether at room temperature using mercury(II) trifluoroacetate as a highly efficient catalyst. The appropriate vinyl ethers were reacted under acidic conditions with 3′,5′-O-silyl-protected uridine 42 to the corresponding 2′-O-(1-alkoxyethyl) derivatives 43–83 which gave, on
Nucleotides, Part LXVIII, Acetals as New 2′-O-Protecting Functions for the Synthesis of Oligoribonucleotides: Synthesis of Monomeric Building Units and Oligoribonucleotides
For the efficient synthesis of oligoribonucleotides by the 5′-O-(4,4′-dimethoxytrityl) phosphoramidite approach, the 2′-O-[1-(benzyloxy)ethyl]acetals 56 – 67 were investigated. Studies with the 2′-O-[1-(benzyloxy)ethyl]-5′-O-(dimethoxytrityl)ribonucleoside3′-phosphoramidites 56 – 59 gave, however, only reasonable results. The oligoribonucleotides obtained showed some impurities since the acid stabilities