In particular, zolmitriptan 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 hydrazine (III); b) In situ Reaction of the hydrazine hydrochloride (III) with ?-keto-?-valerolactone, to give the hydrazone (IV); c) Fischer indole synthesis of the hydrazone (IV), to give the pyranoindolone of formula (V); d) Transesterification of the pyranoindolone (V) to provide the compound (VI), in which R means a straight or branched C1-C4 alkyl; e) Conversion of the hydroxyl group of the compound (VI) into dimethylamino to give the indolecarboxylate (VII), in which R means a straight or branched C1-C4 alkyl; f) Saponification of the 2-carboalkoxy group of the compound (VII), to provide indolecarboxylic acid (VIII); g) Decarboxylation of the indolecarboxylic acid (VIII), to provide zolmitriptan and, eventually, to provide a pharmaceutically acceptable salt thereof.
特别是左米曲坦或其药学上可接受的盐,包括:a)制备
苯胺盐酸盐(II)的重氮盐,随后还原和酸化以得到
肼(III); b)
肼盐酸盐(III)与?-酮-?-
戊内酯原位反应,得到
肼酮(IV); c)
肼酮(IV)的费舍尔
吲哚合成,得到式(V)的
吡喃
吲哚酮; d)转酯化
吡喃
吲哚酮(V)以提供化合物(VI),其中R表示直链或支链C1-C4烷基; e)将化合物(VI)的羟基转化为
二甲氨基以得到
吲哚羧酸酯(VII),其中R表示直链或支链C1-C4烷基; f)皂化化合物(VII)的2-羧酰氧基,以提供
吲哚羧酸(VIII); g)将
吲哚羧酸(VIII)脱羧,以提供左米曲坦,并最终提供其药学上可接受的盐。