Abstract:
A biocatalytic method of preparing optically pure precursors of paroxetine and a method of preparing paroxetine therefrom are disclosed. A racemic trans ester precursor compound of paroxetine is first prepared. The racemic trans ester precursor compound comprises a mixture of (3S, 4R) and (3R, 4S) enantiomers. The (3R, 4S) enantiomer is hydrolyzed biocatalytically to the corresponding (3R, 4S)-trans carboxylic acid or alternatively, the (3S, 4R) enantiomer is biocatalytically hydrolyzed to the (3S, 4R)-trans carboxylic acid in a reaction catalyzed by an isolated enzyme or a microorganism. In the first instance, the unhydrolyzed (3S, 4R) enantiomer is separated from the (3R, 4S)-trans carboxylic acid, whereas in the second instance the (3S, 4R)-trans carboxylic acid is separated from the unhydrolyzed (3R, 4S) enantiomer. The (3S, 4R) enantiomer obtained following the selective hydrolysis is reduced to form a (-)-trans-(3S, 4R) primary alcohol precursor of paroxetine. Paroxetine is then formed from the (-)-trans-(3S, 4R) primary alcohol precursor.
Abstract:
Methods and compositions are disclosed utilizing the optically pure (R)-isomer of lomefloxacin. This compound is a potent drug for the treatment of infection or other diseases requiring antibiotics while avoiding the concomitant liability of adverse effects that are associated with the racemic mixture of lomefloxacin.
Abstract:
Methods and compositions are disclosed utilizing the optically pure S(-) isomer of felodipine. This compound is a potent drug for the treatment of hypertension while avoiding the concomitant liability of adverse effects associated with the racemic mixture of felodipine. The S(-) isomer of felodipine is also useful for the treatment of angina and such other conditions as may be related to the activity of S(-) felodipine as a calcium channel antagonist such as cerebral ischemia, cerebral disorders, arrhythmias, cardiac hypertrophy, coronary vasospasm, myocardial infarction, renal impairment and acute renal failure, without the concomitant liability of adverse effects associated with the administration of the racemic mixture of felodipine.
Abstract:
Methods and compositions are disclosed utilizing the optically pure (-) isomer of amlodipine. This compound is a potent drug for the treatment of hypertension while avoiding the concomitant liability of adverse effects associated with the racemic mixture of amlodipine. The (-) isomer of amlodipine is also useful for the treatment of angina and such other conditions as may be related to the activity of (-) amlodipine as a calcium channel antagonist such as cerebral ischemia, cerebral disorders, arrhythmias, cardiac hypertrophy, coronary vasospasm, myocardial infarction, renal impairment and acute renal failure, without the concomitant liability of adverse effects associated with the racemic mixture of amlodipine.
Abstract:
The invention relates to an apparatus useful for the separation of at least one preselected ligate present in a fluid. The invention also features an easily scaled-up membrane affinity separation process which is highly reliable, highly selective, provides a high yield of product, and is further characterized by a high volumetric throughput. The invention utilizes a substantially isotropic porous membrane, to which is associated a preselected ligand, which provides an optimum loading capacity and low dead volume while allowing high filtrate flow rates. Methods for isolating macromolecules having therapeutic value are described.