摘要:
Derivatives of 1,2-benzisoxazole-3-methanesulfonic acid, which are non-hygroscopic and non-hydrated and their use as intermediates fro the preparation of zonisamide are disclosed. Further disclosed are processes of preparing zonisamide from these 1,2-benzisoxazole-3-methanesulfonic acid derivatives, processes of preparing exemplary 1,2-benzisoxazole-3-methanesulfonic acid derivatives and crystalline forms of exemplary 2-benzisoxazole-3-methanesulfonic acid derivatives. A novel process of preparing zonisamide is also disclosed.
摘要:
The present invention provides an improved method of chromatographically separating the isomers of (1R,rR)-atracurium salts by high-performance liquid chromatography (HPLC), in the absence of a strong acid. The separation is preferably performed on a silica gel HPLC column using an eluent containing an organic solvent, a polar aprotic co-solvent and a weak organic acid.
摘要:
The present invention provides novel isoquinolinium compounds, methods of producing the isoquinolinium compounds, and methods for converting them into cisatracurium, e.g., cisatracurium besylate. The isoquinolinium compounds of the present invention can be obtained in the form of solids, which can be purified using simple techniques and can be used to afford pure cisatracurium besylate without HPLC purification.
摘要:
The present invention provides an improved method for obtaining cisatracurium besylate, which preferably chromatographically separating cisatracurium besylate from a mixture of (1R,1′R)-atracurium isomers via flash chromatography
摘要:
The present invention provides an improved method of chromatographically separating the isomers of (1R,rR)-atracurium salts by high-performance liquid chromatography (HPLC), in the absence of a strong acid. The separation is preferably performed on a silica gel HPLC column using an eluent containing an organic solvent, a polar aprotic co-solvent and a weak organic acid.
摘要:
The present invention provides novel isoquinolinium compounds, methods of producing the isoquinolinium compounds, and methods for converting them into cisatracurium, e.g., cisatracurium besylate. The isoquinolinium compounds of the present invention can be obtained in the form of solids, which can be purified using simple techniques and can be used to afford pure cisatracurium besylate without HPLC purification
摘要:
The present invention provides a process for preparing highly pure 4-amino-1-isobutyl-1H-imidazo[4,5-c]quinoline (imiquimod). The process preferably includes heating 4-chloro-1-isobutyl-1H-imidazo[4,5-c]quinoline of formula (II) with ammonia in a polar aprotic solvent at relatively moderate pressure to produce imiquimod, and optionally purifying the imiquimod. The process of the present invention can produce highly pure imiquimod in high yield.
摘要:
Provided is a process for producing highly pure 4-amino-1-isobutyl-1H-imidazo[4,5-c]quinoline (imiquimod), which includes reacting 4-chloro-1-isobutyl-1H-imidazo[4,5-c]quinoline with a non-gaseous amine precursor. Also provided are methods for isolating highly pure imiquimod. Further provided are intermediates useful in the production of imiquimod, methods for producing such intermediates, and methods for obtaining imiquimod from such intermediates.
摘要:
The present invention provides an improved method for obtaining cisatracurium besylate, which preferably chromatographically separating cisatracurium besylate from a mixture of (1R,1′R)-atracurium isomers via flash chromatography.
摘要:
The present invention provides processes for producing isoquinolinium compounds, and for converting them into cisatracurium salts, e.g., cisatracurium besylate