38 results about "Synthesis of nucleosides" patented technology

The present process provides an improved method for converting 2′-deoxy-2′-fluoro-2′-methyl-D-ribonolactones derivatives to 3-fluoro-3-methyl-2-chlorofuran compounds which are useful for the synthesis of nucleosides and improved processes for the synthesis of the D-ribonolactone compounds.

Provided are processes and intermediates for the syntheses of nucleosides of pyrrolo[1,2-f][1,2,4]triazinyl and imidazo[1,24][1,2,4]triazinyl heterocycles of Formula I.

A host cell stably transformed or transfected by a vector including a DNA sequence encoding for mutant purine nucleoside cleavage enzymes is provided. The transformed or transfected host cell can be used in combination with a purine substrate to treat tumour cells and/or virally infected cells. A nucleotide sequence encoding mutant E. coli derived purine nucleoside phosphorylase proteins which can be used in conjunction with an appropriate substrate to produce toxins which impair abnormal cell growth is also provided. A method is detailed for the delivery of toxin by generation withing target cells or by administration and delivery to the cells from without. Novel purine nucleosides are detailed that yield a cytotoxic purine upn enzymatic cleavage. A synthetic process for nucleosides is also detailed.

A process for providing regiospecific and highly stereoselective synthesis of 9-β anomeric purine nucleoside analogs is described. The introduction of the sugar moiety on to 6-(azolyl)-substituted purine bases is performed so that highly stereoselective formation of the β anomers of only the 9 position regioisomers of the purine nucleoside analogs (either D or L enantiomers) is obtained. This regiospecific and stereoselective introduction of the sugar moiety allows the synthesis of nucleoside analogs, and in particular 2′-deoxy, 3′-deoxy, 2′-deoxy-2′-halo-arabino and 2′,3′-dideoxy-2′-halo-threo purine nucleoside analogs, in high yields without formation of the 7-positional regioisomers. Processes for providing novel 6-(azolyl)purines for the regiospecific and highly stereoselective synthesis of 9-β anomeric purine nucleoside analogs are described. The compounds are drugs or intermediates to drugs.

The present invention relates to synthesis, purification and methods to obtain high purity novel 2′-arabino-O-methyl nucleosides and the corresponding phosphoramidites of various arabinonucleoside bases and introduction of such units into defined sequence synthetic DNA and RNA. Various synthetic oligonucleotides, such as HIV integrase inhibitor 14-mer and thrombin binding oligonucleotide, thrombin-1, bearing ara-2′-omethyl modification have been synthesized. It is anticipated the oligonucleotides incorporating these monomers will exhibit biological activities related to antisense approach approach, design of better SiRNA's, diagnostic agents. Similarly, it is anticipated that oligonucleotides incorporating such novel nucleosides will be useful to develop therapeutic candidates designing stable G-quadruplexes and Aptamers for oligonucleotide structure, folding topology, evaluation of biochemical properties and design and develop as therapeutic agents. It is further anticipated that the nucleosides, phosphates and triphosphates of this invention could develop as therapeutic agents.

A compound method of high-yield nucleoside phosphorylase strains and arabinose nucleoside pertains to biochemical engineering field, in particular to the high-yield nucleoside phosphorylase strains and a method for compounding arabinose purine nucleoside with the strains by an enzyme method. The invention aims at solving a technical problem for providing the strains of the high-yield nucleoside phosphorylase and strains of uridine phosphorylase and the method for producing the arabinose purine nucleoside with the strains. The invention discloses enterobacter aerogenes with a preservation number of CGMCC No.2035 and the method for producing the arabinose purine nucleoside with the strains, and the invention comprises steps that (1) the enterobacter aerogenes DWOQ-58 of the invention is cultured and collected, and (2) the enterobacter aerogenes DWOQ-58 is contacted with arabinose donor and receptors of purine base. The strains of the invention are rich in vigor and resists 5-flucytosine with an average conversion rate of more than 80 percent in general and the reaction time of the invention is shortened to less than 12 hours.

The invention discloses a synthetic method of a labelled precursor of a positron emission developer (a thymidine derivative), in particular relates to a synthetic method of 5'-O-(4,4'-dimethoxytriphenylmethyl)-2,3'-anhydro-thymidine. The synthetic method comprises the following steps: thymidine is taken as a raw material for reacting with 4,4'-dimethoxytriphenylmethyl and methylsulfonyl chloride, an intermediate product is subject to a cyclization reaction in alkaline aqueous solution, and finally separated and purified to obtain a final product. The synthetic method has the advantages of low-cost raw materials, simple operation, few process steps, short reaction time and high product yield.

Disclosed are compounds of nucleoside 5 '-triphosphates of formula (I), or derivatives thereof, or pharmaceutically acceptable salts of said nucleoside 5 '-triphosphates or said derivatives, wherein the Base of formula (I) is Adenine (A), Cytosine (C), Guanine (G), Thymine (T), Uracil (U), modified nucleobase or unnatural nucleobase; R1 is H or OH, R2 is H or OH, X is independently selected from the group consisting of O, S and Se; and Y is independently selected from the group consisting of O, B (borano, or BH3), S, and Se. Also disclosed are processes of preparing the compounds of formula (I), said process comprising steps according to Scheme A.

A method of stereoselectively synthesizing a [beta]-nucleoside, e.g., 2'-deoxy-2,2'-difluorocytidine, is described. The method includes reacting a tetrahydrofuran compound of the following formula, wherein R1, R2, R3, R4 and L are defined as in the specification, with a nucleobase derivative in the presence of an oxidizing agent.

A diastereoselective process for the preparation of compounds of formula (I), wherein W is S, S=O, SO2, or O; X is S, S=O, SO2, or O; R1 is hydrogen or acyl, and R2 is a purine or pyrimidine base or an analogue or derivative thereof, is described.

The invention relates to a synthesis process of fluorinated nucleosides, comprising the following steps: step 1, refluxing cytosine and hexamethyldisilazane under the catalysis of ammonium sulfate, then adding isopropanol, and raising the temperature, Obtain a cytosine silyl ether protecting group solution; step 2, dissolve the glycosyl compound in isoamyl alcohol and stir, then add a catalyst and heat to obtain a glycosyl compound solution; step 3, drop the glycosyl compound into the cytosine silyl ether protecting group solution Add the glycosyl compound solution, after the dropwise addition, continue to keep warm for an hour, then filter with suction, add hydrochloric acid dropwise to the filtrate to precipitate a solid, and obtain an intermediate after drying; step 4, the intermediate Carry out the deprotection of the hydroxyl group to obtain the fluorinated nucleoside. The invention not only ensures the formation of the target intermediate configuration, but also greatly reduces the temperature, which not only reduces the requirements for equipment, improves the safety of operation, but also reduces energy consumption, which is beneficial to reduce costs, and is suitable for large-scale production applications .

The invention discloses a method for compounding 2,6-dichloropurine nucleoside by using inosine as a raw material. The method is characterized by using cheap inosine as the raw material; obtaining 6-chlorine triacetyl purine nucleoside through acetylation and chlorination reactions; then enabling the 6-chlorine triacetyl purine nucleoside to react with trifluoromethanesulfonic acid; introducing nitro in at a second site; finally completing two reactions of acetyl removing and nitro chlorination in an ethanol solution which is saturated by a hydrogen chloride gas, obtaining the 2,6-dichloropurine nucleoside, wherein the total yield is 63 percent. According to the method for compounding the 2,6-dichloropurine nucleoside by using the inosine as the raw material, disclosed by the invention, the raw materials are cheap and are easily obtained, a reagent of which the price is expensive and poisonous and harmful heavy metal catalysts are prevented from being used, and the yield is not obviously reduced when the reaction scale is enlarged to 200 g; a new compounding way is provided for compounding of the 2,6-dichloropurine nucleoside, and a potential application prospect is obtained.

A process for the preparation of nucleosides, derivatives and analogues thereof by coupling reaction of a protected suitable nitrogeneous purine or pyrimidine base, a derivative or analogue thereof and a protected suitable sugar in the presence of SnCl₄ comprising the removal of SnCl4 by adding DMSO directly into the reaction mixture is described. Preferably said process is used for the preparation of antiviral and antitumor agents having a nucleoside or nucleoside-like structure, still more preferably for the preparation of azacytidine, decitabine, chlorfarabine, cladribine, mizoribine. A residual tin content lower than 300 ppm is obtained with said process.

The invention relates to the technical field of nucleotide synthesis, in particular to a compound and a preparation method thereof, and a preparation method of nucleoside oligophosphate. The preparation method of the compound comprises the following steps: putting a nucleoside phosphate raw material, imidazole and an activating agent into a first solvent for a first reaction. According to the invention, the water-soluble raw material and the activating agent are subjected to a reaction to prepare the compound, and the compound can be used as a raw material for synthesizing nucleoside oligophosphate, so that rapid and stable synthesis of nucleoside oligophosphate is facilitated. The phosphate raw material and the compound prepared in the invention are subjected to a second reaction in a second solvent, and then desalination is performed to prepare nucleoside oligophosphate; compared with the prior art, triethylamine conversion does not need to be carried out on the nucleoside phosphate raw material, the utilization rate of the nucleoside phosphate raw material is increased, and the reaction period is shortened.

The invention discloses a preparing method of 1,2,3-tris-O-acetyl-5-deoxy-beta-D-ribose, and belongs to the field of synthesis of nucleosides in organic chemistry. The preparing method includes the steps of making inosine 1 react with halogenated sulfoxide to obtain a compound 2, reducing the compound 2 under the conditions of hypophosphorous acid and AIBN, adding methyl alcohol for deprotection to obtain a compound 3, and making the compound 3 react in acetic anhydride under the catalysis of inorganic boric acid to obtain 1,2,3-tris-O-acetyl-5-deoxy-beta-D-ribose. The synthesis method is lowin raw material price, short in step and easy to industrially produce and has industrial application prospects.

The invention discloses novel 2'-uridine azide and a synthetic method thereof. The structural formula of the compound is as shown in specification, and reaction steps of the synthetic method of the novel 2'-uridine azide are as shown in specification. The synthetic method is mild in reaction condition, simple in aftertreatment and simple and convenient to operate, and conditions are provided for synthesis of the compound on a large scale. The obtained compound can serve as an active ingredient of an antiviral drug, and has potential application prospect in development of a new antiviral nucleosides drug. The novel 2'-uridine azide lays a foundation for further discovery of the new antiviral nucleosides drug, and meanwhile, the nucleoside analog of a novel 2' modifying structure also provides a new though for nucleoside modification in the future.