[EN] PROCESS FOR PREPARING RIZATRIPTAN<br/>[FR] PROCEDE DE PREPARATION DE RIZATRIPTAN
申请人:VITA LAB
公开号:WO2004014877A1
公开(公告)日:2004-02-19
In particular, rizatriptan or a pharmaceutically acceptable salt thereof, which includes a) Preparation of the diazonium salt of the aniline hydrochloride (II); followed by reduction and acidification to give the hydrazine (III); b) reaction in situ of the hydrazine hydrochloride (III) with α-keto-δ-valerolactone, to give the hydrazone (IV); c) Fischer indole reaction of the hydrazone (IV), to give the pyranoindolone (V), optionally followed by a hydrolysis reaction to give (VI); d) Transesterification of (V) or esterification of its hydrolysis product (VI), to give (VII), where R means straight or branched C1-C4 alkyl chain; e) Conversion of the hydroxyl group of (VII) into dimethylamino, to give the indolecarboxylate (VIII), where R has the meaning defined above; f) Saponification of the 2-carboalkoxy group of (VIII) to give indolecarboxylic acid (IX); and g) Decarboxylation of the indolecarboxylic acid (IX) to give rizatriptan and, eventually, to obtain a pharmaceutically acceptable salt thereof. The invention also relates to synthesis intermediates to obtain rizatriptan.
特别是,瑞扎曲普坦或其药用可接受的盐,包括以下步骤:a) 制备苯胺盐酸(II)的重氮盐;接着通过还原和酸化得到肼(III);b) 将肼盐酸(III)与α-酮-δ-戊内酯原位反应,得到腙(IV);c) 对腙(IV)进行费舍尔吲哚反应,得到吡喃吲哚酮(V),可选地通过水解反应得到(VI);d) 对(V)进行酯交换或对其水解产物(VI)进行酯化,得到(VII),其中R表示直链或支链的C1-C4烷基链;e) 将(VII)中的羟基转化为二甲氨基,得到吲哚甲酸酯(VIII),其中R具有上述定义的含义;f) 对(VIII)中的2-碳烷氧基进行皂化,得到吲哚甲酸(IX);以及g) 对吲哚甲酸(IX)进行脱羧,得到瑞扎曲普坦,最终获得药用可接受的盐。本发明还涉及用于获得瑞扎曲普坦的合成中间体。