The present invention relates to a process for the preparation of a 4,5-diamino shikimic acid derivative of formula
and pharmaceutically acceptable addition salts thereof wherein
R
1
, R
1′
are independent of each other H or alkyl,
R
2
is an alkyl and
R
3
, R
4
are independent of each other H or an alkanoyl, with the proviso that not both R
3
and R
4
are H. 4,5-diamino shikimic acid derivatives of formula I, especially the (3R,4R,5S)-5-amino-4-acetylamino-3-(1-ethyl-propoxy)-cyclohex-1-ene-carboxylic acid ethyl ester and its pharmaceutically acceptable additional salts are potent inhibitors of viral neuraminidase.
本发明涉及一种制备4,5-二
氨基
香草酸衍
生物的方法,其
化学式为及其药学上可接受的加成盐,其中R1,R1'独立地为H或烷基,R2为烷基,R3,R4独立地为H或脂肪酰基,但R3和R4不同时为H。化合物I的4,5-二
氨基
香草酸衍
生物,特别是(3R,4R,5S)-5-
氨基-4-乙酰
氨基-3-(1-乙基-丙氧基)-环己-1-烯-
羧酸乙酯及其药学上可接受的加成盐是病毒
神经氨酸酶的有效
抑制剂。