Abstract:
The present invention encompasses processes (1) for preparing racemic 2-(benzhydrylsulfinyl)acetic acid by combining the (S)- or the (R)-enantiomer with at least one organic solvent and at least one acid promoter, such as perchloric acid or an acyl halide; (2) for preparing racemic 2-(benzhydrylsulfinyl)acetamide or racemic 2-(benzhydrylsulfinyl)acetic acid by combining the (S)- or the (R)-enantiomer with at least one organic solvent having a boiling point above 60°C, heating to a temperature above 60°C and cooling. The present invention also encompasses the conversion of the racemic intermediates to armodfinil.
Abstract:
The present invention provides methods of purifying montelukast, a new isolated impurity of montelukast of formula I, method for its isolation, and method of using montelukast impurity as a reference marker and a reference standard.
Abstract:
The present invention provides a process comprising admixing a thioether with about 1.05 to about 1.6 molar equivalents of an active chlorine-containing oxidant, preferably sodium hypochlorite, and about 2.5 to about 5.0 molar equivalents of an alkali metal base; and recovering a sulfoxide that is preferably pantoprazole, lansoprazole, omeprazole, or rabeprazole. The process may further comprise contacting the sulfoxide with a source of sodium ions, preferably sodium hydroxide, to produce the sodium salt of the sulfoxide. The invention also relates to novel chlorinated derivatives of pantoprazole including 5(difluoromethoxy)-2-[[(3,4-dimethoxy-2-pyridinyl)-chloromethyl]sulfinyl]-1H- benzimidazole and 5-(difluoromethoxy)-2-[[(3,4-dimethoxy-2-pyridinyl)chlorohydroxymethyl] sulfinyl]-1H-benzimidazole and processes for making them. The invention also relates to processes of quantifying and identifying a compound other than pantoprazole in a mixture of pantoprazole and at least one other compound.
Abstract:
The present invention provides a process comprising admixing a thioether with about 1.05 to about 1.6 molar equivalents of an active chlorine-containing oxidant, preferably sodium hypochlorite, and about 2.5 to about 5.0 molar equivalents of an alkali metal base; and recovering a sulfoxide that is preferably pantoprazole, lansoprazole, omeprazole, or rabeprazole. The process may further comprise contacting the sulfoxide with a source of sodium ions, preferably sodium hydroxide, to produce the sodium salt of the sulfoxide. The invention also relates to novel chlorinated derivatives of pantoprazole including 5(difluoromethoxy)-2-[[(3,4-dimethoxy-2-pyridinyl)-chloromethyl]sulfinyl]-1H- benzimidazole and 5-(difluoromethoxy)-2-[[(3,4-dimethoxy-2-pyridinyl)chlorohydroxymethyl] sulfinyl]-1H-benzimidazole and processes for making them. The invention also relates to processes of quantifying and identifying a compound other than pantoprazole in a mixture of pantoprazole and at least one other compound.
Abstract:
The present invention encompasses processes for the preparation and purification of paliperidone palmitate, for the purification of palmitic acid, for the preparation of paliperidone sodium salt and the preparation of paliperidone tetradecanoate or octadecanoate ester. The latter may further be used in a quantification method for determining the purity of paliperidone palmitate.
Abstract:
The present invention presents crystal forms of Rosiglitazone hydrobromide, denominated Form I and Form II, methods of their preparation, as well as pharmaceutical compositions comprising these crystalline forms.