Abstract:
The invention relates to processes for making montelukast of formula I and to intermediates for use in the process, in particular compounds of formulas 2 - 7:
Abstract:
The invention relates to new compounds of formula (III): wherein R is a C 1 -C 4 linear or branched alkyl group. The invention also relates to new compounds of formula (IV) wherein M is a metal. The invention also relates to methods of making compounds of formulas (III) and (IV) and to methods of making donepezil and pharmaceutically acceptable salts thereof, such as donepezil hydrochloride, using the compounds.
Abstract:
The present invention provides a polymorph of esomeprazole potassium termed "Form C", which is in the form of an ethanol solvate. There is also provided processes for preparing Form C of esomeprazole potassium and pharmaceutical compositions comprising it.
Abstract:
A process for the preparation of trityl olmesartan comprising (a) condensing 4-(1-hydroxy- 1-methylethyl)-2-propyl-imidazol-5-carboxylic acid alkyl ester with trityl biphenyl bromide in the presence of a polar aprotic solvent and a base selected from the group consisting of alkali metal carbonates, alkali metal hydroxides, alkali metal alkoxides, and tertiary amines to obtain a compound of formula (V): b) deesterifying the compound of formula (V) with a base; and c) reacting the product of step (b) with 4-halomethyl-5-methyl-2-oxo-1,3-dioxolene of formula (IV): wherein X is halogen selected from F or Cl or Br or I, to obtain trityl olmesartan medoxomil of formula. The trityl olmesartan medoxomil may be deprotected to produce olmesartan medoxomil.
Abstract:
The invention relates to processes for making montelukast and to intermediates for use in the process, in particular compounds of formulas 2-7: L=OAc, OTs, OTf5OMs; where X=Cl, Br, I.
Abstract:
There is provided a compound of formula (III), and a process for preparing a compound of formula (V) comprising converting a compound of formula (III) to the compound (V), wherein (X) is fluoro, chloro, bromo or iodo. There is also provided a process for preparing a compound of formula (Xl) comprising converting a compound of formula (X) to the compound (Xl). The compounds (V) and (Xl) so prepared may be used in a process for preparing gefitinib.
Abstract:
A process for preparing Form A of (S)-5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)- methyl]sulfinyl]-1 H-benzimidazole magnesium dihydrate, processes for preparing various intermediates useful in the preparation of Form A of (S)-5-methoxy-2-[[(4-methoxy-3,5- dimethyl-2-pyridinyl)-methyl]sulfinyl]-1 H-benzimidazole magnesium dihydrate and a novel polymorphic Form II of 5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)-methyl]thio]-1 H- benzimidazole.
Abstract:
A process for preparation of rabeprazole sodium comprising oxidation of wet or dry rabeprazole sulphide with sodium hypohalite in water or a mixture of water and water miscible solvent using alkali metal hydroxide and catalyst is disclosed herein. The present invention also discloses process for preparation of rabeprazole sulphide.
Abstract:
The invention relates to a stable, non hygroscopic alpha crystalline form of methane sulfonic acid addition salt of 4-(4-methyl piperazin-lyl methyl)-N-[4-methyl-3-(4-pyridin-3-yl) pyrimidin-2-yl amino) phenyl]-benzamide (imatinib mesylate). A process for the preparation of the crystalline form is also described.
Abstract:
The present invention provides a process for the preparation of paliperidone or a pharmaceutically acceptable salt thereof, wherein the process comprises condensing a compound of formula (II) with a compound of formula (III) or a salt thereof, in a suitable solvent and a base, in the presence of a catalyst and an inhibiting agent, wherein the inhibiting agent is added to the reaction system before the compound of formula (II) and compound of formula (III) have reacted or as the reaction of the compound of formula (II) and compound of formula (III) is initiated, and optionally converting the paliperidone to a salt thereof, wherein X is a suitable leaving group. The present invention also provides substantially pure paliperidone or a salt thereof, paliperidone or a salt thereof as prepared by the process and uses of the paliperidone or salt thereof.