Abstract:
Provided herein is a novel process for the preparation of triazolo[4,5-d]pyrimidine derivatives. Provided particularly herein is a novel, commercially viable and industrially advantageous process for the preparation of highly pure ticagrelor or a pharmaceutically acceptable salt thereof. Provided further herein is a novel process for the preparation of substituted cyclopentanamine derivatives, which are useful intermediates in the preparation of triazolo[4,5-d]pyrimidine compounds. Provided particularly herein is a novel, commercially viable and industrially advantageous process for the preparation of a ticagrelor intermediate, 2-[[(3aR,4S,6R,6aS)-6-amino-2,2-dimethyltetrahydro-3aH-cyclopenta[d] [1,3]- dioxol-4-yl]oxy]- 1 -ethanol.
Abstract:
Disclosed herein is a convenient, commercially viable and environmentally friendly process for the preparation of Armodafinil. The present invention also provides an improved, commercially viable and industrially advantageous process for the preparation of pure 2-[(diphenylmethyl) sulfinyl] acetic acid (also known as modafinic acid) substantially free of sulfone impurity i.e., 2-[(diphenylmethyl)sulfonyl] acetic acid. The intermediate is useful for preparing Modafmil and its enantiomers, or a pharmaceutically acceptable salt thereof, in high yield and purity.
Abstract:
Novel salts of rosuvastatin and processes for their preparation are disclosed. Pharmaceutical compositions comprising a therapeutically effective amount of one or more salts of rosuvastatin selected from the group consisting of a barium salt, strontium salt, zinc salt, cesium salt, cadmium salt and mixtures thereof are also disclosed.
Abstract:
Provided herein is a novel process for the preparation of phenylcyclopropylamine derivatives, which are useful intermediates in the preparation of triazolo[4,5-d]pyrimidine compounds. Provided particularly herein is a novel, commercially viable and industrially advantageous process for the preparation of a substantially pure ticagrelor intermediate, trans-(1R,2S)-2-(3,4-difluorophenyl)-cyclopropylamine. The intermediate is useful for preparing ticagrelor, or a pharmaceutically acceptable salt thereof, in high yield and purity.
Abstract:
Provided herein is a novel process for the preparation of phenylcyclopropylamine derivatives, which are useful intermediates in the preparation of triazolo[4,5-d]pyrimidine compounds. Provided particularly herein is a novel, commercially viable and industrially advantageous process for the preparation of a substantially pure ticagrelor intermediate, trans-(1R,2S)-2-(3,4-difluorophenyl)-cyclopropylamine. The intermediate is useful for preparing ticagrelor, or a pharmaceutically acceptable salt thereof, in high yield and purity.
Abstract:
Provided herein are improved, commercially viable and industrially advantageous processes for the preparation of a substantially pure ticagrelor intermediate, 4,6-dichloro-5-nitro-2- (propylthio)pyrimidine, Formula (II). The intermediate is useful for preparing ticagrelor, or a pharmaceutically acceptable salt thereof, in high yield and purity.
Abstract:
Provided herein are impurities of paliperidone, 3-[2-[4-[l-(4-fruoro-2-hydroxyphenyl) methanoyl]piperidinyl-l-yl]ethyl]-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[l,2-a]pyrimidin-4- one (methanoyl impurity), 3-[2-[4-(6-fluoro-l,2-benzisoxazol-3-yl)-l-piperidinyl]ethyl]-2- methyl-4H-pyrido[l,2-a]pyrimidin-4-one (dehydroxy impurity) and 3-[2-[4-(6-fluoro-l,2- benzisoxazol-3-yl)-l-piperidinyl]ethyl]-2-methyl-7,8-dihydro-6H-pyrido[l,2-a]pyrimidin- 4,9-dione (9-keto impurity), and processes for preparing and isolating thereof. Provided further herein is a highly pure paliperidone or a pharmaceutically acceptable salt thereof substantially free of methanoyl, dehydroxy and 9-keto impurities, process for the preparation thereof, and pharmaceutical compositions comprising highly pure paliperidone or a pharmaceutically acceptable salt thereof substantially free of methanoyl, dehydroxy and 9- keto impurities. Provided also herein are improved and efficient processes for preparing paliperidone intermediates.
Abstract:
Novel salts of rosuvastatin and processes for their preparation are disclosed. Pharmaceutical compositions comprising a therapeutically effective amount of one or more salts of rosuvastatin selected from the group consisting of a barium salt, strontium salt, zinc salt, cesium salt, cadmium salt and mixtures thereof are also disclosed.
Abstract:
Disclosed herein is an improved process for the preparation of substituted cyclopentanamine derivatives, which are useful intermediates in the preparation of triazolo[4,5-d]pyrimidine compounds. Particularly described is an improved, commercially viable and industrially advantageous process for the preparation of a ticagrelor intermediate, [3aR-(3aα,4α,6α,6aα]-2-[[6-amino-2,2-dimethyltetrahydro-4H-cyclopenta-1,3-dioxol-4- yl]oxy]-ethanol, alternatively named, 2-[[(3aR,4S,6R,6aS)-6-amino-2,2-dimethyltetrahydro- 3aH-cyclopenta[d] [1,3] -dioxol-4-yl]oxy] -1-ethanol.
Abstract:
Provided herein are impurities of paliperidone, 3-[2-[4-[l-(4-fruoro-2-hydroxyphenyl) methanoyl]piperidinyl-l-yl]ethyl]-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[l,2-a]pyrimidin-4- one (methanoyl impurity), 3-[2-[4-(6-fluoro-l,2-benzisoxazol-3-yl)-l-piperidinyl]ethyl]-2- methyl-4H-pyrido[l,2-a]pyrimidin-4-one (dehydroxy impurity) and 3-[2-[4-(6-fluoro-l,2- benzisoxazol-3-yl)-l-piperidinyl]ethyl]-2-methyl-7,8-dihydro-6H-pyrido[l,2-a]pyrimidin- 4,9-dione (9-keto impurity), and processes for preparing and isolating thereof. Provided further herein is a highly pure paliperidone or a pharmaceutically acceptable salt thereof substantially free of methanoyl, dehydroxy and 9-keto impurities, process for the preparation thereof, and pharmaceutical compositions comprising highly pure paliperidone or a pharmaceutically acceptable salt thereof substantially free of methanoyl, dehydroxy and 9- keto impurities. Provided also herein are improved and efficient processes for preparing paliperidone intermediates.