摘要:
The present invention relates to a process for preparing Bosentan Monohydrate; in particular, the present invention provides the preparation of the novel 4-tert-butyl-N-[6-(2-hydroxy-ethoxy)-5-(2-methoxy-phenoxy)-2-(2-pyrimidinyl)-pyrimidin-4-yl]-benzenesulfonamide sodium salt as an ethylene glycol solvate (Bosentan sodium salt ethylene glycol solvate), which is a useful intermediate for obtaining Bosentan Monohydrate in a pure form.
摘要:
The present invention relates to a process for preparing Nebivolol and, more particularly, to an improved process for synthesizing enantiomerically enriched 6-fluoro chroman alcohol or epoxide derivatives of formula, wherein R and X is defined in the description; as useful intermediates in the preparation of Nebivolol.
摘要:
A process for preparing N-[(1R)-1-(1-naphthyl)ethyl]-3-[3-(trifluoromethyl)-phenyl]propan-1-amine of formula hydrochloride salt of formula (I); i.e. Cinacalcet.HC1 and its intermediate of formula (IX).
摘要:
The present invention relates to a process for preparing Nebivolol and, more in particular, to a fractional distillation method of a mixture of stereoisomers of formula intermediates useful in the preparation of nebivolol.
摘要:
A process for the manufacturing of levetiracetam, wherein said process comprises the steps of: (1) reacting the (-)-(S)-alpha-ethyl-2-oxo-1-pyrrolidine acetic acid with a substoichiometric amount of an activating agent in an alcoholic solvent, and (2) subjecting the resulting reaction solution of step (1) to an ammonolysis process with gaseous ammonia.
摘要:
The present invention relates to a process for the preparation of carvedilol as well as of the optically active R and S enantiomers thereof and of mixtures of these enantiomers and, more particularly, relates to an improved process for the preparation of carvedilol and its enantiomers characterized by the use of ethyl acetate as reaction solvent.
摘要:
A process for resolving dorzolamide trans racemate, which comprises reacting said racemate with (1S) - (+) -10-camphorsulfonic acid so obtaining the (4S, 6S) enantiomer by selectively precipitating and recovering the camphorsulfonic acid salt thereof (dorzolamide camphorsulfonate) , and neutralizing dorzolamide camphorsulfonate to obtain dorzolamide.
摘要:
A process for resolving dorzolamide trans racemate, which comprises reacting said racemate with (1S) - (+) -10-camphorsulfonic acid so obtaining the (4S, 6S) enantiomer by selectively precipitating and recovering the camphorsulfonic acid salt thereof (dorzolamide camphorsulfonate) , and neutralizing dorzolamide camphorsulfonate to obtain dorzolamide.
摘要:
The present invention relates to a process for the preparation of gabapentin and, more particularly, it relates to a precipitation process of gabapentin by acidification of an aqueous solution deriving from the Hofmann rearrangement of 1,1-cyclohexanediacetic acid monoamide.