摘要:
The present invention relates to a process for preparing valsartan from a compound of general formula (I), wherein R is cumyl, trityl or t-butyl. The process comprises a first step, wherein the protective group is eliminated and thereafter the oxazolidinone ring is opened by catalytic hydrogenationin the presence of an organic base. Finally, Valsartanor a pharmaceutically acceptable salt thereofis isolated.
摘要:
The present invention relates to a process for preparing2-(2- pyridylmethyl)sulphinyl-1H-benzimidazoles that are proton pump inhibitors, using as intermediates 2-benzimidazolylsulphinic acid derivatives. The present invention also relates to saidintermediate compounds, their use and a process for the preparation thereof. These novel intermediate compounds are 2-benzimidazolylsulphinicacid esters that are obtained from their corresponding alkaline salts, which are in turn obtained by oxidation of substituted 2-mercaptobenzimidazoles. The intermediate compounds of the invention are converted into 2-(2- pyridylmethyl)sulphinyl-1H-benzimidazoles by reaction with substituted2- methylpyridines.
摘要:
An improved preparation of non-steroidal antiandrogen drugs, such as 4-[3-[4-cyano-3- (trifluoromethyl)phenyl]-5,5-dimethyl-4-oxo-2-thioxo-1-imidazolidinyl]-2-fluoro-N-methyl- benzamide and intermediates thereof, is described.
摘要:
A crystalline form of tezacaftor, an industrially viable and advantageous process for its preparation and a method for the preparation of amorphous form of tezacaftor are described.
摘要:
Industrially viable and advantageous processes for the preparation of Ozanimod are described. The invention also discloses the intermediates obtained in the process.
摘要:
The invention relates to an industrially viable and advantageous process for the preparation of (2S,3 R )-2-amino-3-(3,4-dihydroxyphenyl)-3-hydroxypropanoic acid, having the following formula (I) generally known as Droxidopa, or of intermediates useful in the synthesis thereof.
摘要:
The present invention relates to a crystalline form of moxifloxacin base, to a process for its preparation, to pharmaceutical compositions containing it, and to its use as an antibacterial agent.