Synthesis and characterization of mannosylated oligoribonucleotides
作者:Yuyan Zhao、Kha Tram、Hongbin Yan
DOI:10.1016/j.carres.2009.08.033
日期:2009.11
Oligoribonucleotide (RNA)-carbohydrate conjugates bearing mono- and divalent mannosides were readily obtained using 3,4-diethoxy-3-cyclobutene-1,2-dione as the linking agent in the presence of trace amount of triethylamine. The glycoconjugates were purified by HPLC and characterized by electrospray mass spectroscopy.
Selective synthesis of chlorophosphoramidites using ionic liquids
作者:Eric J. Amigues、Christopher Hardacre、Gillian Keane、Marie E. Migaud、Sarah E. Norman、William R. Pitner
DOI:10.1039/b905000k
日期:——
sensitivity and impurity issues hampering existing traditional synthetic routes have been eased. Not only can stock chemicals be used without purification, but the reactions may be conducted at room temperature and at high concentrations. Furthermore, reaction times are reduced and rapid addition of reagents is possible whilst retaining tight control over product selectivity. Beyond their role as reaction
Synthesis of diphosphorylated and diphosphonylated Lipid A monosaccharide analogues via phosphite intermediates
作者:P. Westerduin、G. H. Veeneman、J. H. van Boom
DOI:10.1002/recl.19871061201
日期:——
The synthesis of two Lipid A monosaccharide analogues, 3-O-palmitoyl-2-deoxy-2-palmitamido-α-D-glucopyranose 1,4-diphosphate (1) and the corresponding 1,4-bis(1H-phosphonate) (2), is described. The introduction of the phosphate functions was achieved via phosphitylation of the anomeric and non-anomeric hydroxyl groups with the monofunctional phosphitylating reagents benzyl 2-cyanoethyl N,N-diethylphosphoramidite
New nucleoside phosphoramidites and coupling protocols for solid-phase RNA synthesis
作者:Matthew H. Lyttle、Peter B. Wright、Nanda D. Sinha、J. D. Bain、A. Richard Chamberlin
DOI:10.1021/jo00015a010
日期:1991.7
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 fragments of a streptococcus pneumoniae type-specific capsular polysaccharide