Abstract: The invention comprises a process for preparing quetiapine and/or its salts, including, quetiapine fumarate. The process generally comprises reacting dibenzothiazepinone (dibenzo[bf][1,4]thiazepin-11(10H)-one) with phosphorous oxychloride in the presence of triethylamine in an aromatic organic solvent such as toluene or, preferably, xylene at reflux temperature to obtain an aromatic hydrocarbon solution of 11-chloro-dibenzo[bf][1,4]thiazepine. Thereafter, the 11-chloro-dibenzo[bf][1,4]thiazepine is reacted with 2-(2-piperazin-1-ylethoxy)-ethanol to yield, following several processing steps, quetiapine. Compound I can then be further reacted with fumaric acid at elevated temperature to yield quetiapine fumarate. The resulting quetiapine fumarate obtained is suitable for use in pharmaceutical preparations.

Abstract: The invention relates to new polymorphic forms of olopatadine hydrochloride, designated herein as olopatadine hydrochloride Forms A and B, and methods of preparing, purifying and treating them.

Abstract: The invention relates generally to an improved process for manufacturing desvenlafaxine free base and salts or solvates thereof.

Abstract: Disclosed is a process for preparing purified ranolazine of formula (I), which is indicated for the chronic treatment of angina, comprising reacting 1-[(2,6-dimethylphenyl)aminocarbonyl]piperazine with 1-phenoxy-2,3-epoxypropane in an inert solvent followed by precipitating the ranolazine.

Abstract: The invention comprises a process for preparing quetiapine and/or its salts, including, quetiapine fumarate. The process generally comprises reacting dibenzothiazepinone (dibenzo[bf][1,4]thiazepin-11(10H)-one) with phosphorous oxychloride in the presence of triethylamine in an aromatic organic solvent such as toluene or, preferably, xylene at reflux temperature to obtain an aromatic hydrocarbon solution of 11-chloro-dibenzo[bf][1,4]thiazepine. Thereafter, the 11-chloro-dibenzo[bf][1,4]thiazepine is reacted with 2-(2-piperazin-1-ylethoxy)-ethanol to yield, following several processing steps, quetiapine. Compound I can then be further reacted with fumaric acid at elevated temperature to yield quetiapine fumarate. The resulting quetiapine fumarate obtained is suitable for use in pharmaceutical preparations.

Abstract: The present invention relates to a novel process for the preparation of montelukast sodium, a compound of Formula (1b) and precursors thereof. The invention further concerns the free acid of this compound in crystalline form, obtainable for the first time by the new process.