Abstract:
This invention relates to methods and apparatus for carrying out affinity separations of proteins under conditions optimized for recovering biologically active protein. The method utilizes a membrane-bound ligand first to capture and separate a ligate from a fluid mixture and subsequently to release said ligate in purified form. The present methods enhance the yield of active ligate recovered in the process. The invention has particular relevance to the recovery and purification of proteins from mixtures.
Abstract:
The invention relates to a process for the production of cyclic sulfates and cyclic sulfamidates from the corresponding cyclic sulfite and cyclic sulfamidite substrate, respectively. The method involves the electrolysis of a solvent mixture containing active metal species, non-metal oxidant species and substrate.
Abstract:
The optically pure isomer of nitrendipine having anti-hypertensive activity, is a potent anti-hypertensive drug for reducing blood pressure in individuals without the undesirable side effects associated with administration of a racemic mixture of nitrendipine. A method is disclosed utilizing an optically pure isomer of nitrendipine for treating hypertension while reducing undesirable side effects associated with nitrendipine.
Abstract:
An efficient and commerically-viable method for the stereoselective transformation of a diol to an alcohol is disclosed. The present method is particularly well-suited for the preparation of the unnatural D-isomer of malic acid or its derivatives from the abundant naturally occurring L-tartaric acid or derivatives thereof.
Abstract:
This invention relates to novel methods for converting a diastereomeric mixture of S-protected derivatives of an orally active inhibitor of an angiotensin-converting enzyme (ACE) and its analogues into its separate optically resolved diastereomeric components. Specifically the invention relates to methods for the preparation of optically purified captopril and its analogs from racemic precursors. This resolution process is achieved through the fractional crystallization of S-protected derivatives of captopril and its precursors, which derivatives are useful for the reason that they are (1) easily prepared from novel precursors, (2) resolvable to their optically purified stereoisomeric species and (3) convertible to non-derivatized stereoisomeric species which correspond to the pharmacologically active inhibitor and its analogues. Novel methods for preparing the derivatives and their precursors are also noted herein. In addition, the novel derivatives and their precursors are also described herein.
Abstract:
The present invention relates to a novel method for conducting phase transfer catalysis in a multiphase reaction system wherein the different phases are separated by a membrane permeable to the phase transfer catalyst and its various reaction complexes. The invention also relates to membranes and a membrane-containing apparatus useful in carrying out phase transfer catalysis.
Abstract:
Methods for increasing D-Serine concentration and reducing concentration of the toxic products of D-Serine oxidation, for enhancing learning, memory and/or cognition, or for treating schizophrenia, Alzheimer's disease, ataxia or neuropathic pain, or preventing loss in neuronal function characteristic of neurodegenerative diseases involve administering to a subject in need of treatment a therapeutically effective amount of a compound of formula I, or a pharmaceutically acceptable salt or solvate thereof: wherein R1 and R2 are independently selected from hydrogen, halo, nitro, alkyl, acyl, alkylaryl, and XYR5; or R1 and R2, taken together, form a 5, 6, 7 or 8-membered substituted or unsubstituted carbocyclic or heterocyclic group; X and Y are independently selected from O, S, NH, and (CR6R7)n; R3 is hydrogen, alkyl or M+; M is aluminum, calcium, lithium, magnesium, potassium, sodium, zinc ion or a mixture thereof; Z is N or CR4; R4 is from selected from hydrogen, halo, nitro, alkyl, alkylaryl, and XYR5; R5 is selected from aryl, substituted aryl, heteroaryl and substituted heteroaryl; R6 and R7 are independently selected from hydrogen and alkyl; n is an integer from 1 to 6; at least one of R1, R2 and R4 is other than hydrogen; and at least one of X and Y is (CR6R7)n. D-serine or cycloserine may be coadministered along with the compound of formula I.
Abstract translation:提高D-丝氨酸浓度,降低D-丝氨酸氧化毒性浓度的方法,用于增强学习,记忆和/或认知,或用于治疗精神分裂症,阿尔茨海默病,共济失调或神经性疼痛,或防止神经功能特征丧失 的神经变性疾病涉及向需要治疗的受试者施用治疗有效量的式I化合物或其药学上可接受的盐或溶剂合物:其中R 1和R 2独立地选自氢,卤素,硝基,烷基,酰基, 烷基芳基和XYR5; 或R 1和R 2一起形成5,6,7或8元取代或未取代的碳环或杂环基团; X和Y独立地选自O,S,NH和(CR 6 R 7)n; R3是氢,烷基或M +; M是铝,钙,锂,镁,钾,钠,锌离子或它们的混合物; Z是N或CR4; R4选自氢,卤素,硝基,烷基,烷基芳基和XYR5; R 5选自芳基,取代的芳基,杂芳基和取代的杂芳基; R6和R7独立地选自氢和烷基; n是1至6的整数; R 1,R 2和R 4中的至少一个不是氢; 并且X和Y中的至少一个是(CR 6 R 7)n。 D-丝氨酸或环丝氨酸可以与式I化合物共同给药。
Abstract:
The invention relates to prodrugs of fused heterocyclic inhibitors of D-amino oxidase (DAAO) and methods of treating diseases and conditions, wherein modulation of D-amino acid oxidase activity, D-serine levels, D-serine oxidative products and NMDA receptor activity in the nervous system of a mammalian subject is effective.
Abstract:
Treatment of CNS disorders with (1R,4S)-trans 4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-1-napthalenamine; and (1S,4R)-trans 4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-1-napthalenamine is disclosed. A process for preparing 4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-1-napthalenamine is also disclosed. The process includes the preparation of all four isomers of N-[4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydronaphthalen-1-yl]formamide, which are also useful.
Abstract:
A method of preparation of a highly pure salt of R,R-formoterol L-tartrate is disclosed. The process provides the most thermodynamically stable polymorph by recrystallization of a novel polymorph.