New nucleoside phosphoramidites and coupling protocols for solid-phase RNA synthesis
摘要:
The 5'-O-(4,4'-dimethoxytrityl)-2'-O-(trialkylsilyl)ribonucleoside 3'-O-(2-cyanoethyl N,N-diethylphosphoramidites) 3, 5, 7, and 9, modified monomers for RNA synthesis, were prepared from 2-cyanoethyl N,N-diethylchloro-phosphoramidite (1). In conjunction with newly developed coupling protocols for automated solid-phase synthesis, they afforded synthetic oligoribonucleotides up to 74 base units in length. The performance of the new compounds was compared to the analogous 5'-O-(4,4'-dimethoxytrityl)-2'-O-(trialkylsilyl)ribonucleoside 3'-O-(2-cyanoethyl N,N-diisopropylphosphoramidites) 4, 6, 8, and 10. Complete removal of benzoyl groups from N2-benzoylguanosine, which was incorporated into some of the synthetic oligoribonucleotides, was demonstrated. Purification procedures by reverse phase HPLC and PAGE methods are also presented.
Synthesis of pCpCpA-3‘-<i>NH</i>-Phenylalanine as a Ribosomal Substrate
作者:Biliang Zhang、Lei Zhang、Lele Sun、Zhiyong Cui
DOI:10.1021/ol026560f
日期:2002.10.1
[reaction: see text] The trinucleotide cytidylyl(3'-->5'phosphoryl)cytidylyl(3'-->5'phosphoryl)-3'-deoxy-3'-(L-phenylalanyl) amido adenosine (CpCpA-NH-Phe) was synthesized by phosphoramidite chemistry from3'-amino-3'-deoxyadenosine as the ribosomal substrate. The 3'-amino-3'-deoxyadenosine was first converted to 3'-(N-tert-butyloxycarbonyl-L-phenylalanine)amido-3'-deoxy-6-N,6-N,2'-O-tribenzoyl-adenosine
The present invention provides a method for preparing nucleotide oligomers, including (a) coupling a nucleotide dimer or nucleotide trimer to a nucleoside attached to solid supports or to universal solid supports as a starting material; (b) sequentially coupling nucleotide monomers to the resulting structures of Step (a) to prepare a nucleotide oligomer; and (c) removing the nucleotide oligomers from the solid supports.
The method of the present invention provides nucleotide oligomers having 15-20% higher purity than the conventional art. The present invention enables the efficient and inexpensive synthesis of nucleotide oligomers with high purity within a shorter period of time.
Quick Access to Nucleobase-Modified Phosphoramidites for the Synthesis of Oligoribonucleotides Containing Post-Transcriptional Modifications and Epitranscriptomic Marks
nucleobases of commercially available nucleoside phosphoramidites. This method involves the deprotonation of amide groups under phase-transfer conditions and subsequent reaction with electrophilic molecules such as alkyl halides or organic isocyanates. Using this approach, we obtained 10 different classes of modified nucleoside phosphoramidites suitable for the synthesis of oligonucleotides, including several
The 5'-phosphorylated oligonucleotides (5'-pONs) are currently synthesized using expensive and sensitive modified phosphoramidite reagents. In this work, a simple, cost-effective, efficient, and automatable method is presented, based on the controlled oxidation of the 5'-terminal alcohol followed by a beta-elimination reaction. The latter reaction leads to the removal of the terminal 5'-nucleoside and subsequent formation of the 5'-phosphate moiety. Thus, chemical phosphorylation of oligonucleotides (DNA or RNA) is achieved without using modified phosphorarnidites.
Kierzek, Ryszard; Rozek, Marek; Markiewicz, Wojciech T., Bulletin of the Polish Academy of Sciences: Chemistry, 1987, vol. 35, # 11-12, p. 507 - 516
作者:Kierzek, Ryszard、Rozek, Marek、Markiewicz, Wojciech T.