摘要:
Subject-matter of the present invention is a process for preparing intermediates for the synthesis of optically active beta-amino alcohols by enzymatic reduction of the corresponding beta-amino ketones. Subject-matter of the invention are also said novel synthesis intermediates and the use thereof in the preparation of active pharmaceutical ingredients, among which vilanterol and the salts thereof.
摘要:
Die Erfindung betrifft primär ein Verfahren zur Herstellung von D-Glufosinat oder dessen Salzen unter Verwendung von Ephedrin, insbesondere die Herstellung von D-Glufosinat oder dessen Salzen durch (dynamische kinetische) Racematspaltung. Ferner betrifft die Erfindung bestimmte Salze von Glufosinat und Ephedrin und die Verwendung von Ephedrin zur (dynamischen kinetischen) Racematspaltung von DL-Glufosinat oder dessen Salzen.
摘要:
The present invention is related to a product for the resolution of racemic mixtures in which various separation processes of a salt composed of a PEGylated resolving agent and an enantiomer in a racemic mixture is utilized. Separation can be caused by temperature- dependent phase transformation of the said salt pair in aqueous or organic media as well as other methods used is separation of PEG such as salting out (e.g. addition of ammonium sulfate). The first cycle of racemic resolution by this method was shown to afford 85% optically pure amino acid from a 50:50 mixture of racemic L,D-amino acids esters. An additional cycle improved optical purity up to 95%.
摘要:
The present invention relates to a simple economical process for the purification of an acid addition salt of a compound of Formula (III) contaminated with an acid addition salt of a compound of Formula (III'), which comprises washing at least once the addtion salt of the compound of Formula III with an organic solvent capable of removing the acid addition salt of the compound of Formula III' to obtain the acid addition salt of the compound of Formula III in chiral purity of greater than 99.5 % and chromatographic purity of greater than 99 %.
摘要:
The present invention provides compounds of formula (I) and pharmaceutically acceptable salts thereof, wherein R1, R2, R3, R4 a and R4 b are as defined in the specification, processes for their preparation, pharmaceutical compositions containing them and their use in therapy. The compounds of formula (I) are mGluR7 modulators.
摘要:
The invention relates to a compound of formula (I) wherein R 1 to R 3 are defined as in the description and in the claims. The compound of formula (I) can be used as a medicament.