摘要:
The present invention is concerned with a process of preparing (R)-lacosamide. The process comprises providing an (R,S)-lacosamide precursor and contacting the same with at least an enzyme in the presence of a solvent. The enzyme either stereoselectively hydrolyzes or acetylates an (R)- or (S)-enantiomer of the (R,S)-lacosamide precursor. The process further comprises where appropriate also concurrently, or successively, employing one or more reagents capable of converting the hydrolysed or acetylated (R)- or (S)-enantiomer to (R)- lacosamide.
摘要:
The invention relates to a compound having formula (IV), which is an intermediate compound that is used for the preparation of pioglitazone. The invention also relates to a method of obtaining the novel compound (IV) from a natural product, L-tyrosine, in which the amino group, in the form of an imino-aromatic group, is protected. The invention further relates to a method of obtaining pioglitazone from the aforementioned intermediate compound.
摘要:
The invention relates to a process for reducing the residual amount of p-chloroaniline in chlorhexidine. Also, the invention relates to a process for preparing chlorhexidine, or a pharmaceutically acceptable salt thereof, which is free of potential genotoxicity. In addition, the invention refers to the said chlorhexidine, or a pharmaceutically acceptable salt thereof, which is free of potential genotoxicity. Further, the invention relates to an analytical HPLC method for the determination of potentially genotoxic impurities in samples of chlorhexidine, or of a pharmaceutically acceptable salt thereof. The invention also relates to stabilized chlorhexidine digluconate salt free of potential genotoxicity in aqueous solution, and to a method for stabilizing chlorhexidine digluconate salt free of potential genotoxicity in aqueous solution.
摘要:
The present invention relates to a process for preparing racemic narwedine (which can be can be kinetically resolved to yield (-)-narwedine and which is the biogenic precursor of (-)- galanthamine) and the use thereof as a starting material for producing (-)-galanthamine. The invention further includes processes for preparing (-)-galanthamine and (-)-galanthamine hydrobromide, as well as related novel compounds.
摘要:
The invention relates to retigabine with improved color quality, and to processes for preparing the same. In addition, the invention relates to a process for drying wet retigabine. Also, the invention relates to stabilized or substantially stabilized retigabine in solid state or pharmaceutical formulation comprising the same. Further, the invention also relates to an improved process for preparing retigabine.
摘要:
Disclosed are solid Forms, and corresponding mixtures, of the anti-epileptic agent lacosamide (I). Also disclosed is a mixture of lacosamide enantiomers crystallized in a conglomerate Form and the use thereof in providing enantiomerically enriched lacosamide, preferably lacosamide enriched with the (R)- enantiomer of lacosamide.
摘要:
The invention relates to rasagiline mesylate with improved flowability and compressibility and with advantageously reduced stickiness, to processes for the preparation thereof, and to the use thereof for milling and for preparing pharmaceutical formulations. Also, the invention relates to a method for improving the flowability and / or alleviating the stickiness of rasagiline mesylate having a very poor flowability and / or showing undesirable stickiness.
摘要:
A process for preparing substituted pyrrolidine compounds, including (5)-2-{l-[2- (2,3-dihydrobenzofuran-5-yl)ethyl]-3-pyrrolidinyl}-2,2-diphenylacetamide hydrobromide, commonly known in the art as darifenacin, comprising reacting a pyrrolidine compound with a benzofuran derivative in the presence of a phase-transfer catalyst.
摘要:
The present invention relates to a novel compound of formula (IV)
which is an intermediate that can be used for the preparation of pioglitazone. It also relates to a method of obtaining the novel compound (IV) starting from the natural product L-tyrosine, in which the amino group is protected in the form of aromatic imino group, and a method of obtaining pioglitazone from the said intermediate.