Abstract:
The present invention is directed to novel processes for the preparation of paricalcitol to novel intermediates used in these processes, and to processes for preparation of the novel intermediates.
Abstract:
The invention concerns a process for preparing olopatadine or a salt thereof, comprising:. (a) reacting 11-oxo-6,11-dihydroxydibenz[b,e]oxepin-2-acetic acid, a Wittig reagent selected from the group consisting of 3-dimethylamino-propyltriphenylphosphonium halides and salts thereof, and a suitable base, under Wittig reaction conditions, to provide a reaction mixture containing olopatadine; (b) adding an amount of water sufficient to protonate residual ylide present in the reaction mixture to provide a hydrolyzed reaction mixture; (c) adjusting, if necessary, the pH of the hydrolyzed reaction mixture, or aqueous phase thereof, to a pH of about pH 12 or higher to convert excess 3-dimethylamino- propyltriphenylphosphonium halide, or salt thereof, into 3-dimethylamino- propyldiphenylphosphine oxide; (d) extracting the solution of step (c) with a suitable solvent to provide a solution containing a diastereomeric mixture of olopatadine and (E)-11 -[3-dimethylaminopropylidene]- 6,1 l-dihydrodibenz[b,e]oxepin-2-acetic acid and having a substantially reduced amount of 3- dimethylamino-propyldiphenylphosphine oxide; (e) adjusting the pH of the solution obtained in step (d) to a pH between pH 4 and pH 5 to provide acid-addition salts of olopatadine and (E)-11-[3-dimethylaminopropylidene]- 6,1 l-dihydrodibenz[b,e]oxepin-2-acetic acid; (f) extracting the acid-addition salts of olopatadine and (E)-11-[3- dimethylaminopropylidene]-6,l l-dihydrodibenz[b,e]oxepin-2-acetic with a water-miscible solvent selected from the group consisting of (i) n-butanol; and (ii) mixtures of methyl-THF and a C1-C4 alcohol; provided that if the selected solvent is a mixture of methyl-THF and a Cl - C4 alcohol, then the solution is evaporated and the residue is taken up in n-butanol/water; (g) concentrating by azeotropic distillation the n-butanol/water solvent containing the acid-addition salts of olopatadine and (E)-11-[3-dimethylaminopropylidene]-6,11- dihydrodibenz[b,e]oxepin-2-acetic acid; and (h) fractionnally crystallizing the acid-addition salt of olopatadine.
Abstract:
The present invention provides novel polymorphic and pseudopolymorphic forms of Trandolaprilat, including crystalline Trandolaprilat Form A, crystalline Trandolaprilat Form B, crystalline Trandolaprilat Form C, crystalline Trandolaprilat Form D, crystalline Trandolaprilat Form E, and mixtures thereof. The invention also provides novel methods for producing Trandolaprilat, pharmaceutically acceptable salts of Trandolaprilat, and polymorphic and pseudopolymorphic forms of Trandolaprilat, pharmaceutical compositions including one or more novel Trandolaprilat compounds and methods for treating high blood pressure and/or cardiac insufficiency using one or more novel Trandolaprilat compounds.
Abstract:
The invention concerns a process for preparing olopatadine or a salt thereof, comprising:. (a) reacting 11-oxo-6,11-dihydroxydibenz[b,e]oxepin-2-acetic acid, a Wittig reagent selected from the group consisting of 3-dimethylamino-propyltriphenylphosphonium halides and salts thereof, and a suitable base, under Wittig reaction conditions, to provide a reaction mixture containing olopatadine; (b) adding an amount of water sufficient to protonate residual ylide present in the reaction mixture to provide a hydrolyzed reaction mixture; (c) adjusting, if necessary, the pH of the hydrolyzed reaction mixture, or aqueous phase thereof, to a pH of about pH 12 or higher to convert excess 3-dimethylamino- propyltriphenylphosphonium halide, or salt thereof, into 3-dimethylamino- propyldiphenylphosphine oxide; (d) extracting the solution of step (c) with a suitable solvent to provide a solution containing a diastereomeric mixture of olopatadine and (E)-11 -[3-dimethylaminopropylidene]- 6,1 l-dihydrodibenz[b,e]oxepin-2-acetic acid and having a substantially reduced amount of 3- dimethylamino-propyldiphenylphosphine oxide; (e) adjusting the pH of the solution obtained in step (d) to a pH between pH 4 and pH 5 to provide acid-addition salts of olopatadine and (E)-11-[3-dimethylaminopropylidene]- 6,1 l-dihydrodibenz[b,e]oxepin-2-acetic acid; (f) extracting the acid-addition salts of olopatadine and (E)-11-[3- dimethylaminopropylidene]-6,l l-dihydrodibenz[b,e]oxepin-2-acetic with a water-miscible solvent selected from the group consisting of (i) n-butanol; and (ii) mixtures of methyl-THF and a C1-C4 alcohol; provided that if the selected solvent is a mixture of methyl-THF and a Cl - C4 alcohol, then the solution is evaporated and the residue is taken up in n-butanol/water; (g) concentrating by azeotropic distillation the n-butanol/water solvent containing the acid-addition salts of olopatadine and (E)-11-[3-dimethylaminopropylidene]-6,11- dihydrodibenz[b,e]oxepin-2-acetic acid; and (h) fractionnally crystallizing the acid-addition salt of olopatadine.
Abstract:
A process of making racemic [2S*[R*[R*[R*]]]] and [2R*[S*[S*[S*]]]]-(±)a,a`- [iminobis(methylene)]bis[6-fluoro-3,4-dihydro-2H-1-benzopyran-2-methanol] of the compound of the formula (I) and its pure [2S*[R*[R*[R*]]]]- and [2R*[S*[S*[S*]]]]- enantiomer compounds and pharmaceutically acceptable salts thereof.