A process for the preparation of oligoribonucleotides of definend predetermined sequence containing the natural 3'-5'-internucleotide linkage, which comprises reacting an oligonucleotide with a monofunctional substrate in the presence of polynucleotide phosphorylase, to form a product which is longer, by one monomeric unit than the initial oligonucleotide, isolating the product from the reaction mixture, removing the blocking agent and repeating the process a desired number of times, adding by e...

The present invention is directed to a process for preparing a compound having the formula: ##STR00001## wherein R is a range of organic groups and X is a leaving group. The process may include reacting a compound of the formula ##STR00002## with a water-removing reagent. Also, when X is a halogen, the process may include reacting a compound of the formula ##STR00003## with a halogenating agent or a sulfonylating agent. Alternatively, when X is a halogen, the process may be carried out by reacti...

A method of preparing cabergoline Form I, comprising forming a solvate including cabergoline and a p-disubstituted benzene of formula (A) or 1,3,5-trimethylbenzene and obtaining cabergoline Form I from the solvate. Another aspect of the present invention provides a method for preparing cabergoline Form I comprising dissolving cabergoline in p-disubstituted benzene or 1,3,5-trimethylbenzene and recovering the cabergoline Form I polymorph, suitably by direct crystallization of Form I or by recover...

The present invention relates to a process for preparing 5-chloro-N-({(5S)-2-oxo-3-[4-(3-oxo-4-morpholinyl)phenyl]-1,3-oxazolidin-- 5-yl}methyl)-2-thiophenecarboxamide starting from 2-[(2S)-2-oxiranylmethyl]-1H-isoindole-1,3(2H)-dione, 4-(4-aminophenyl)-3-morpholinone and 5-chlorothiophene-2-carbonyl chloride.

A process for the preparation of a compound of formula (A) wherein: X is hydrogen or hydroxy, chloro, C.sub.1-6 alkoxy or pheny C.sub.1-6 alkoxy; and R.sub.a and R.sub.b are hydrogen, or acyl or phosphate derivatives thereof, which process comprises: (i) the preparation of a compound of formula (I) wherein R.sub.1 is C.sub.1-6 alkyl, or phenyl C.sub.1-6 alkyl in which the phenyl group is optionally substituted; R.sub.2 is hydrogen, hydroxy, chlorine, C.sub.1-6 alkoxy, phenyl C.sub.1-6 alkoxy or ...

The invention relates to a process for ketalizing triacetonamine by reacting triacetonamine and a hydroxyl derivative, for example, a mono- or polyhydric alcohol, with gaseous hydrogen chloride to give an open-chain or cyclic ketal.

A process is described for preparing alkoxycarbonylaminotriazines by reacting di- or triaminotriazines with dimethyl carbonate in the presence of an alcohol and of an alkali metal or alkaline earth metal methoxide base.

Provided is a cilostazol preparation which comprises incorporating a fine powder of cilostazol into a dispersing and/or solubilizing agent thereby to enhance the dispersibility and/or solubility. Further, provided is a process for improving absorbability of a slightly soluble drug such as cilostazol even at the lower portion of the digestive tract, wherein said drug is hard to be absorbed at the lower portion of the digestive tract when a conventional method is used. According to the present inv...

A TS-1 catalyst suitable for the production of oxirane compounds is prepared by subjecting conventionally formed TS-1 to a size reduction treatment such as milling such that the average particle size weighted by volume of the TS-1 is reduced to less than 10 microns in diameter and the size reduced TS-1 is spray dried.

A hair dye composition comprising a component (A), which is a specified long-chain acyl sulfonic acid salt anionic surfactant, in an amount of 0.1 to 10.0 wt. %; a component (B), which is an aliphatic alcohol, in an amount of 0.25 to 25.0 wt. %; and a component (C), which is an acid dye and/or a natural dyestuff. The hair dye composition is stable even in a strongly acidic region (pH 1.5 to 4.5) where it exerts a dyeing effect. It has an appropriate viscosity and provides excellent sensation upo...