摘要:
A pure amorphous form of rosuvastatin calcium substantially free from alkali metal impurities is disclosed. A process of preparing a pure amorphous form of rosuvastatin calcium is disclosed, which comprises hydrolysis of C1-C5 alkyl esters of rosuvastatin, preferably tert-butyl ester of rosuvastatin, with an organic nitrogen base, e.g. guanidines, amidines, amines and quaternary ammonium hydroxides, in the presence of water, optionally containing aprotic solvent, following the conversion of thus obtained rosuvastatin salt with a source of calcium to obtain rosuvastatin calcium, which is then isolated. An alternative process is disclosed, which comprises the conversion of numerous novel ammonium salts of rosuvastatin, preferably tert-octylammonium salt of rosuvastatin, with the source of calcium to desired commercial rosuvastatin calcium. Rosuvastatin calcium is an inhibitor of HMG CoA reductase, useful in the treatment of hyperlipidemia, hypercholesterolemia and atherosclerosis.
摘要:
A pure amorphous form of rosuvastatin calcium substantially free from alkali metal impurities is disclosed. A process of preparing a pure amorphous form of rosuvastatin calcium is disclosed, which comprises hydrolysis of C1-C5 alkyl esters of rosuvastatin, preferably tert-butyl ester of rosuvastatin, with an organic nitrogen base, e.g. guanidines, amidines, amines and quaternary ammonium hydroxides, in the presence of water, optionally containing aprotic solvent, following the conversion of thus obtained rosuvastatin salt with a source of calcium to obtain rosuvastatin calcium, which is then isolated. An alternative process is disclosed, which comprises the conversion of numerous novel ammonium salts of rosuvastatin, preferably tert-octylammonium salt of rosuvastatin, with the source of calcium to desired commercial rosuvastatin calcium. Rosuvastatin calcium is an inhibitor of HMG CoA reductase, useful in the treatment of hyperlipidemia, hypercholesterolemia and atherosclerosis.
摘要:
A new process for preparing pure amorphous rosuvastatin calcium, substantially free of impurities, is disclosed. A process comprising hydrolysing a C1 to C5 alkyl ester of rosuvastatin, preferably methyl rosuvastatin or tert-butyl rosuvastatin, with a base, e.g. sodium hydroxide, in the presence of an aprotic solvent, preferably tetrahydrofuran and N,N-dimethyl acetamide, or in the presence of a mixture of an aprotic solvent and water, to obtain a solution of rosuvastatin salt, which may be converted to another rosuvastatin salt using another cation, e.g. with calcium cation to obtain rosuvastatin calcium. Rosuvastatin amine salts may be obtained as well.In another preferred aspect of the invention rosuvastatin free acid may be converted to various rosuvastatin salts, e.g. to rosuvastatin calcium, rosuvastatin sodium or various rosuvastatin amine salts, including rosuvastatin solvates, e.g. rosuvastatin calcium hydrate.Rosuvastatin calcium is useful in the treatment of hyperlipidemia, hypercholesterolemia and atherosclerosis.
摘要:
A process for producing bortezomib N-(pyrazin-2-yl)carbonyl-L-phenylalanine-L-leucine boronic acid) comprising the step of deprotecting the compound of formula XII: to yield bortezomib.
摘要:
The invention relates to the preparation of chiral compounds, in particular to the preparation of chiral compounds which may be used as intermediates for the preparation of anti-diabetic agents, preferably sitagliptin.
摘要:
One embodiment disclosed in the invention is the efficient synthesis of halogenated biaryl starting material via Grignard chemistry and the use thereof. Another embodiment of the invention is the reaction of catalyzed carbonylation of the 3′-(2′-halo-biphenyl-4-ylmethyl)-1,7′-dimethyl-2′-propyl-1H,3′H-[2,5′]bibenzoimidazolyl (TLMH) using either gaseous carbon monoxide in a solvent mixture containing water; or formic acid salts optionally together with acetic acid in anhydrous solvent.
摘要:
The present invention relates in general to the field of organic chemistry and in particular to the preparation of α-amino boronic acid derivatives.
摘要:
The present invention relates in general to the field of organic chemistry and in particular to a process for the preparation of 5-((E)-2-((2S,4R)-4-hydroxy-6-oxotetrahydro-2H-pyran-2-yl)vinyl)-4-(4-fluorophenyl)-6-isopropyl-2-(N-methylmethanesulfonylamino)pyrimidine (RSVL) as well as a process for preparing crystalline 5-((E)-2-((2S,4R)-4-(tert-butyldimethylsilyloxy)-6-oxotetrahydro-2H-pyran-2-yl)vinyl)-4-(4-fluorophenyl)-6-isopropyl-2-(N-methylmethanesulfonylamino)pyrimidine (RSVLTBS) useful as key intermediates for the preparation of rosuvastatin or pharmaceutically acceptable salts thereof.
摘要:
A novel synthesis of statins uses Wittig reaction of a heterocyclic core of statin with a lactonized side chain already possessing needed stereochemistry. Any separation of diastereoisomers is performed early in the course of synthesis.
摘要:
The invention relates to the preparation of chiral compounds, in particular to the preparation of chiral compounds which may be used as intermediates for the preparation of anti-diabetic agents, preferably sitagliptin.