摘要:
The present invention provides a method for producing an inosine derivative represented by the following general formula (1) including the steps of subjecting an inosine derivative of general formula (3) to dithiocarbonylation and carrying out radical reduction of the obtained compound. According to the present invention there can be produced compounds useful as anti-AIDS drugs on industrial scale. wherein R1 may be the same or different and are each benzyl group, benzhydryl group or trityl group, each of which may have a substituent in general formulas (1) and (3).
摘要:
The present invention relates to a Variovorax sp. which produces an acylase having an asymmetric hydrolysis activity on an N-acetyl β-amino acid to selectively produce an R-β-amino acid, and a Burkholderia sp. which produces both an acylase having an asymmetric hydrolysis activity on an N-acetyl β-amino acid to selectively produce an S-β-amino acid and an acylase having an asymmetric hydrolysis activity of an N-acetyl β-amino acid to selectively produce an R-β-amino acid, and a process for the selective production of an S-, or R-β-amino acid using the above strains.
摘要:
The present invention relates to a Variovorax sp. which produces an acylase having an asymmetric hydrolysis activity on an N-acetyl β-amino acid to selectively produce an R-β-amino acid, and a Burkholderia sp. which produces both an acylase having an asymmetric hydrolysis activity on an N-acetyl β-amino acid to selectively produce an S-β-amino acid and an acylase having an asymmetric hydrolysis activity of an N-acetyl β-amino acid to selectively produce an R-β-amino acid, and a process for the selective production of an S-, or R-β-amino acid using the above strains.
摘要:
Nucleoside compounds represented by formula (II) may be prepared by subjecting a 2′,3′,5′-triacyloxynucleoside compound represented by formula (I) to deacylation using alkali metal hydroxide in a 0.01- to 0.5-fold amount in a molar ratio relative to the moles of the 2′,3′,5′-triacyloxynucleoside compound. The production method of the nucleoside compound of formula (II) suppresses the formation of by-products, and the products amy be used for the production of nucleoside derivatives. In addition, oxidation of a nucleoside compound represented by formula (1) in the presence of a 2,2,6,6-tetramethylpiperidine-1-oxy catalyst, and hypochlorite or hypobromite, while adjusting pH to fall within 5 to 9, and further, extracting a nucleoside-carboxylic acid compound represented by the formula (2) into an organic solvent under acidic conditions, back-extracting the compound from the organic solvent into an aqueous alkali solution, and neutralizing the aqueous alkali solution by adding an acid thereto affords highly pure crystals of the compound of formula (2) or a salt thereof. wherein each symbol is as defined in the Description.
摘要:
The present invention provides a method for industrially producing an optically active lysine derivative useful as a pharmaceutical intermediate. More particularly, the present invention provides a production method including protecting an amino group or an amino group and carboxyl group of optically active 2-amino-6-methyl-6-nitroheptanoic acid with a protecting group, reducing a nitro group to synthesize a 6,6-dimethyl lysine derivative and reacting the 6,6-dimethyl lysine derivative with an acetic acid derivative.
摘要:
2-Deoxy-L-ribose may be prepared by reacting a compound represented by formula (1) with an organometallic compound represented by formula (2) to give a compound represented by formula (3), which is then subjected to deprotection of a hydroxyl group and production of aldehyde by acid hydrolysis: wherein R1 and R2 are each independently a hydroxyl-protecting group or R1 and R2 in combination form a hydroxyl-protecting group, R3 and R4 are each independently an alkyl group, an aralkyl group, an aryl group or a silyl group or R3 and R4 in combination form an alkylene group.
摘要:
The present invention provides a method for efficiently producing &bgr;-D-ribofuranose derivatives or optical isomers thereof, useful as synthetic intermediates of pharmaceutical nucleic acid-series products. The method comprises a step of producing 1-O-benzyl-&bgr;-D-ribofuranose-2,3,5-triacetate or an optical isomer thereof by allowing &bgr;-D-ribofuranose-1,2,3,5-tetraacetate or an optical isomer thereof to react with a benzyl alcohol in the presence of acid catalysts and a step of hydrolyzing the resulting 1-O-benzyl-&bgr;-D-ribofuranose-2,3,5-triacetate in the presence of a base to produce 1-O-benzyl-&bgr;-D-ribofuranose or an optical isomer thereof.
摘要:
An amino group of an &agr;-amino acid ester is protected as an imine, and it is then reacted with a halomethyllithium to obtain an N-protected-&agr;-aminohalomethylketone. Further, this N-protected-&agr;-aminohalomethylketone is treated with an acid to obtain an &agr;-aminohalomethylketone. This process is suited for industrial production, and can produce an &agr;-aminohalomethylketone and its related compounds economically and efficiently.
摘要:
Optically active N-(S-2-acetylthiomethyl-1-oxo-3-phenylpropyl)-glycine benzyl ester useful as an enkephalin inhibitory agent or ACE inhibitory agent can be produced at low cost in an industrial manner, by a method comprising subjecting optically active 2-hydroxymethyl-3-phenylpropionic acid and glycine benzyl ester to condensation to subsequently convert the hydroxyl group into an elimination group, and substituting the elimination group with an acetylthio group.
摘要:
A process for preparing 2,6-diaminopurine-2′-deoxyriboside and 2′-deoxyguanosine. These compounds may be used as materials for pharmaceuticals, such as antiviral agents and the like, and particularly as starting materials for antisense oligonucleotides.