摘要:
Invention relates to the process for preparation of 13,14-dihydro-PGF2α derivatives of R or S configuration at carbon atom in omega chain substituted by hydroxyl, represented by formula (I), wherein the meaning of substituents is defined in the description. Compounds (I) are valuable biologically active substances or intermediates thereof. The invention especially relates to the process for preparation of 13,14-dihydro-15(R)-17-substituted-18,19,20-trinor-PGF2α, ie. latanoprost.
摘要:
Preparation of sulphonyl derivatives of cholecalciferol of Formula (I), wherein R1 is protective group, preferably t-butyl(dimethyl)silyl, where R2 is heterocyclic group, such as 2-thiazolyl, 2-benzothiazolyl, 1-phenyl-lH-tetrazo-5-yl, 2-pyridyl, 2-pyrimidynyl, 1-isochinolinyl, 1-methyl-2-imidazyl, 4-alkyl-1,2,4-triazo-3-yl, comprising the conversion of the hydroxyl derivative of cholecalciferol into the corresponding sulfide followed by its oxidation to the respective sulphone characterized by the use of hydroxyl derivative of cholecalciferol as a starting material, which triene system is protected as Diels-Alder adduct, and in particular as an adduct with sulfur dioxide of the formula 2a. Novel are derivatives of formula 3a and 4, isolated in the process provided in the invention.
摘要:
A process for the preparation of a pharmaceutical grade calcipotriol anhydrous, wherein a crude calcipotriol is dissolved in one or more solvents, of which at least one forms azeotropic system with water, and then: a) in the case the water and impurities content in the substance exceeds the admissible level, solvents are azeotropically evaporated under reduced pressure, resulting in a clear anhydrous oil , or (b) in the case the water content in the substance does not exceed the admissible level, the solution is allowed to crystallize the product, (c) product obtained in step (a) or (b) is crystallized at least once from anhydrous solvent or mixture of anhydrous solvents.