[EN] PROCESSES FOR THE PREPARATION OF DIASTEREOMERICALLY AND ENANTIOMERICALLY ENRICHED OXAZOLINES [FR] PROCÉDÉS DE PRÉPARATION D'OXAZOLINES DIASTÉRÉOISOMÉRIQUEMENT ET ÉNANTIOMÉRIQUEMENT ENRICHIES
[EN] PROCESSES FOR THE PREPARATION OF DIASTEREOMERICALLY AND ENANTIOMERICALLY ENRICHED OXAZOLINES [FR] PROCÉDÉS DE PRÉPARATION D'OXAZOLINES DIASTÉRÉOISOMÉRIQUEMENT ET ÉNANTIOMÉRIQUEMENT ENRICHIES
The first total synthesis of exochelin MN is described along with rationally designed analogues. The required L-threo-beta-hydroxyamino acidcomponents were constructed using either Sharpless asymmetric aminohydroxylation reactions or an aldol reaction of imidazolidinone 19. A newconcise procedure for the preparation of the constituent six-membered cyclic hydroxamate was developed. In addition, a
[EN] METHOD FOR PREPARING DROXIDOPA AND INTERMEDIATE THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DROXIDOPA ET DE SON INTERMÉDIAIRE<br/>[ZH] 一种屈西多巴及其中间体的制备方法
PROCESS FOR PRODUCING THREO-3-(3,4-DIHYDROXYPHENYL)-L-SERINE
申请人:Yagi Toshikazu
公开号:US20120095256A1
公开(公告)日:2012-04-19
The present invention provides a process for producing Droxidopa or a pharmaceutically acceptable salt thereof comprising a step of reacting threo-N-phthaloyl-3-(3,4-dihydroxyphenyl)-L-serine represented by the formula (1) with methylamine, whereby a process for producing threo-3-(3,4-dihydroxyphenyl)-L-serine (common name: Droxidopa), which is useful as an agent for treatment of peripheral orthostatic hypotension or an agent for treatment of Parkinson's disease, with high production efficiency and without requiring troublesome operations.