Abstract: The invention relates to an efficient and industrially applicable process for the preparation and purification of allopregnanolone and intermediates thereof without the assistance of column chromatography.

Abstract: The invention relates to a process for the preparation of Voxelotor, or a salt or solvate thereof, which comprises the use of a compound of formula (I) or (I?), or a salt or solvate thereof.

Abstract: The invention relates to a process for the preparation of Voxelotor, or a salt or solvate thereof, according to the following scheme (Formula 1).

Abstract: Compounds having the formula or solvates of the compounds can be used as intermediates in the preparation of the synthetic steroids, Etonogestrel and Desogestrel, as well as other pharmaceutically active agents.

Abstract: A process for the preparation of 11-methylene steroids from di-keto steroids involves selective olefination of the ketone at position 11 of the di-keto steroids. The resulting 11-methylene steroid products can be used as intermediates in the preparation of the synthetic steroids, Etonogestrel and Desogestrel, as well as other pharmaceutically active agents.

Abstract: The invention relates to an efficient and industrially applicable process for the preparation and purification of allopregnanolone and intermediates thereof without the assistance of column chromatography.

Abstract: The invention relates to a process for the preparation of 11-methylene steroids through selective olefination of the ketone at position 11. The resulting products are useful intermediates in the preparation of several pharmaceutically active agents, such as Etonogestrel and Desogestrel.

Abstract: The invention relates to a process for obtaining Estetrol or a salt or solvate thereof, the process comprising: a) reacting a compound of formula (IV) or a salt or solvate thereof, wherein R1 is a hydroxyl protecting group selected from a silyl ether, an ether, an ester, a carbamate and a carbonate, and R2 is a hydroxyl protecting group selected from an ether, with an oxidizing agent selected from OsO4 or a source of osmium tetroxide to produce Estetrol or a compound of formula (II) or a salt or solvate thereof wherein R1 is as defined previously; and b) if a compound of formula (II) is obtained in step a), deprotecting said compound to produce Estetrol.

Abstract: The invention relates to new and improved processes for the preparation of Alcaftadine and pharmaceutically acceptable salts thereof as well as an intermediate for the preparation of Alcaftadine. The new process saves a number of steps compared to the known process and results in a higher yield.

Abstract: The invention relates to new and improved processes for the preparation of Alcaftadine and pharmaceutically acceptable salts thereof as well as an intermediate for the preparation of Alcaftadine. The new process saves a number of steps compared to the known process and results in a higher yield.

Abstract: The invention relates to a process for obtaining Estetrol or a salt or solvate thereof, the process comprising: a) reacting a compound of formula (IV) or a salt or solvate thereof, wherein R1 is a hydroxyl protecting group selected from a silyl ether, an ether, an ester, a carbamate and a carbonate, and R2 is a hydroxyl protecting group selected from an ether, with an oxidizing agent selected from OsO4 or a source of osmium tetroxide to produce Estetrol or a compound of formula (II) or a salt or solvate thereof wherein R1 is as defined previously; and b) if a compound of formula (II) is obtained in step a), deprotecting said compound to produce Estetrol.

Abstract: The invention relates to processes for obtaining steroids with a spirolactone group in position 17, particularly to industrially obtaining 6?,7?; 15?,16?-dimethylene-3-oxo-17?-pregn-4-ene-21,17-carbolactone, commonly known as Drospirenone, as well as to intermediates useful in said process.

Abstract: The invention relates to processes for obtaining steroids with a spirolactone group in position 17, particularly to industrially obtaining 6?,7?; 15?,16?-dimethylene-3-oxo-17?-pregn-4-ene-21,17-carbolactone, commonly known as Drospirenone, as well as to intermediates useful in said process.

Abstract: 6-alkylidenandrost-1,4-dien-3-ones of general formula (I), wherein R is H o alkyl; R1 y R2, independently of one another, represent H, OR3, OC(?O)R4 or O-(GPH), wherein R3 is H; C1-C6 alkyl or aryl; R4 is H or C1-C6 alkyl, and GPH is a hydroxyl protecting group; or R1 and R2, together with the carbon atom to which they are bonded, form a carbonyl group or equivalent or a cyclic ketal; can be obtained by a process comprising subjecting the corresponding 6-alkyliden-4-androsten-3-one to a dehydrogenation reaction in the 1,2 position in the presence of a quinone, a silylating agent and a strong acid.