Abstract: There is provided a complex comprising rifaximin and a complexing agent, wherein the complexing agent is a polyvinyl pyrrolidone (PVP) or a cyclodextrin. There is also provided a process for preparing the complex, a pharmaceutical composition including the complex and therapeutic uses of the complex.

Abstract: Amorphous rifaximin, methods of making it, and pharmaceutical compositions containing it. Also described are methods of converting amorphous rifaximin to crystalline rifaximin and vice versa.

Abstract: There is provided a complex comprising rifaximin and a complexing agent, wherein the complexing agent is a polyvinyl pyrrolidone (PVP) or a cyclodextrin. There is also provided a process for preparing the complex, a pharmaceutical composition including the complex and therapeutic uses of the complex.

Abstract: Amorphous rifaximin, methods of making it, and pharmaceutical compositions containing it. Also described are methods of converting amorphous rifaximin to crystalline rifaximin and vice versa.

Abstract: Amorphous rifaximin, methods of making it, and pharmaceutical compositions containing it. Also described are methods of converting amorphous rifaximin to crystalline rifaximin and vice versa.

Abstract: Amorphous rifaximin, methods of making it, and pharmaceutical compositions containing it. Also described are methods of converting amorphous rifaximin to crystalline rifaximin and vice versa.

Abstract: There is provided a complex comprising rifaximin and a complexing agent, wherein the complexing agent is a polyvinyl pyrrolidone (PVP) or a cyclodextrin. There is also provided a process for preparing the complex, a pharmaceutical composition including the complex and therapeutic uses of the complex.

Abstract: There is provided a complex comprising rifaximin and a complexing agent, wherein the complexing agent is a polyvinyl pyrrolidone (PVP) or a cyclodextrin. There is also provided a process for preparing the complex, a pharmaceutical composition including the complex and therapeutic uses of the complex.

Abstract: There is provided a complex comprising rifaximin and a complexing agent, wherein the complexing agent is a polyvinyl pyrrolidone (PVP) or a cyclodextrin. There is also provided a process for preparing the complex, a pharmaceutical composition including the complex and therapeutic uses of the complex.

Abstract: Amorphous rifaximin, methods of making it, and pharmaceutical compositions containing it. Also described are methods of converting amorphous rifaximin to crystalline rifaximin and vice versa.

Abstract: A novel and improved process for preparation of bortezomib mannitol ester is derived, which process avoids excessive use of solvents, involves convenient, industrially feasible and economical techniques, and provides improvements in purity over processes known in the art.

Abstract: There is provided a complex comprising rifaximin and a complexing agent, wherein the complexing agent is a polyvinyl pyrrolidone (PVP) or a cyclodextrin. There is also provided a process for preparing the complex, a pharmaceutical composition including the complex and therapeutic uses of the complex.

Abstract: There is provided a complex comprising rifaximin and a complexing agent, wherein the complexing agent is a polyvinyl pyrrolidone (PVP) or a cyclodextrin. There is also provided a process for preparing the complex, a pharmaceutical composition including the complex and therapeutic uses of the complex.

Abstract: The present invention relates to a process for the preparation of Compound (A): wherein the process comprises contacting atazanavir base (Compound (II)) with sulphuric acid in a combination of two or more solvents and isolating compound (A). The present invention also relates to substantially pure Compound (A), and to Compound (A) devoid of mesityl oxide impurity.

Abstract: Amorphous rifaximin, methods of making it, and pharmaceutical compositions containing it. Also described are methods of converting amorphous rifaximin to crystalline rifaximin and vice versa.

Abstract: Amorphous rifaximin, methods of making it, and pharmaceutical compositions containing it. Also described are methods of converting amorphous rifaximin to crystalline rifaximin and vice versa.

Abstract: The present invention provides improved processes for the preparation of Bortezomib, tert -butyl[1-({(1S)-3-methyl-1-[(3aS,4S,6S,7aS)-3a,5,5-trimethylhexahydro-4,6-methano-1,3,2-benzodioxaborol-2-yl]butyl}amino)-1-oxo-3-phenylpropan-2-yl]carbamate of formula (IV) and N-{(1S)-3-methyl-1-[(3aS,4S,6S,7aS)-3a,5,5-trimethylhexahydro-4,6-methano-1,3,2-benzodioxaborol-2-yl]butyl} phenylalanine of formula (V). Compound (IV) is prepared by coupling (1R)-3-methyl-1-[(3aS,4S,6S,7aR)-3a,5,5-trimethyl-hexahydro-4,6-methano-1,3,2-benzodioxaborol-2-yl]butan-1-amine of formula (II) or its salt with N-(tert-butoxycarbonyl)-L -phenylalanine of formula (III) in a first solvent in the presence of a first coupling agent and a first base, wherein the coupling process does not comprise solvent exchange. Compound (V) is prepared by deprotecting compound (IV) using an alcoholic solution of an inorganic acid.

Abstract: Amorphous rifaximin, methods of making it, and pharmaceutical compositions containing it. Also described are methods of converting amorphous rifaximin to crystalline rifaximin and vice versa.

Abstract: A novel and improved process for preparation of bortezomib mannitol ester is derived, which process avoids excessive use of solvents, involves convenient, industrially feasible and economical techniques, and provides improvements in purity over processes known in the art.

Abstract: There is provided a process for the preparation of sitagliptin or a pharmaceutically acceptable salt thereof, and a process for the preparation of intermediate compounds useful in the preparation of sitagliptin. In particular, there is provided a process comprising condensing 3-tert-butoxycarbonylamino-4-(2,4,5-trifluorophenyl)butyric acid of formula (II) with 3-(trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrazine of formula (III) or a salt thereof in presence of a catalyst to obtain (R)-tert-butyl-4-oxo-4-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]-triazolo[4,3-a]pyrazin-7(8H)-yl)-1-(2,4,5-trifluorophenyl)butan-2-yl-carbamate of formula (IV) or a pharmaceutically acceptable salt thereof. The catalyst is represented by the compound of formula (V). Compound of formula (IV) or its pharmaceutically acceptable salt obtained may be deprotected to obtain a compound of formula (I).