The present invention provides an improved process for preparing (S)-4-[3-[2-(dimethylamino)ethyl]-1H-indol-5-yl]methyl}-2-oxazolidinone which comprises: a) forming a carbamate of formula (III), from methyl 4-nitro-(L)-phenylalaninate hydrochloride; b) reducing the compound of formula (III) to give the compound of formula (IV); c) reducing the methyl ester grouping in the compound of formula (IV) to give the compound of formula (V); d) ring closure of the compound of formula (V) to give the compound of formula (VI); e) diazonium salt formation from the compound of formula (VI) followed by reduction to give the compound of formula (VII); f) Fischer reaction of the compound of formula (VII) to give (S)-4-[3-[2-(dimethylamino)ethyl]-1H-indol-5-yl]methyl}-2-oxazolidinone.
本发明提供了一种改进的制备(S)-4-[3-[2-(二甲基
氨基)乙基]-1H-
吲哚-5-基]甲基}-
2-噁唑烷酮的方法,包括:a) 从甲基4-硝基-(L)-苯丙
氨酸酯盐酸盐形成式(III)的
氨甲酸酯;b) 还原式(III)的化合物以得到式(IV)的化合物;c) 还原式(IV)中的甲基酯基团以得到式(IV)的化合物;d) 环闭合式(V)的化合物以得到式(VI)的化合物;e) 从式(VI)的化合物形成重氮盐,然后还原以得到式(VII)的化合物;f) 弗希反应式(VII)的化合物以得到(S)-4-[3-[2-(二甲基
氨基)乙基]-1H-
吲哚-5-基]甲基}-
2-噁唑烷酮。