申请人:Beecham Group, p.l.c.
公开号:US05017701A1
公开(公告)日:1991-05-21
A process for the preparation of a compound of formula (I) or a pharmaceutically acceptable salt thereof: ##STR1## which process comprises reacting a compound of formula (II): ##STR2## wherein the amino group is optionally protected, Y is iodo, optionally substituted benzylthio or (phenacylmethyl)thio, with a compound of formula (III): ##STR3## wherein Q is a leaving group, R.sub.x and R.sub.y are protected hydroxymethyl or acyloxymethyl, or group(s) convertible to hydroxymethyl or acyloxymethyl; and R.sub.z is hydrogen or a group convertible thereto; and thereafter converting Y to X is hydroxy by means of hydrolysis, or to X is hydrogen by means of reduction; converting R.sub.x and R.sub.y when other than hydroxymethyl or acyloxymethyl, to hydroxymethyl or acyloxymethyl, optionally converting R.sub.x /R.sub.y hydroxymethyl to acyloxymethyl or vice versa, deprotecting the 2-amino group where necessary and converting R.sub.z, (when other than hydrogen) to hydrogen; and optionally forming a pharmaceutically acceptable salt thereof.
一种制备化合物(I)或其药学上可接受的盐的方法:其中该方法包括将化合物(II):其中氨基团可选择性地受保护,Y为碘,可选择性地取代苄硫基或(苯乙酰甲基)硫基,与化合物(III):其中Q为脱离基,Rx和Ry为受保护的羟甲基或乙酰氧甲基,或可转化为羟甲基或乙酰氧甲基的基团;Rz为氢或可转化为氢的基团;然后通过水解将Y转化为X为羟基,或通过还原将Y转化为X为氢;将Rx和Ry(若非羟甲基或乙酰氧甲基)转化为羟甲基或乙酰氧甲基,可选择性地将Rx/Ry羟甲基转化为乙酰氧甲基或反之亦然,必要时去保护2-氨基团并将Rz(若非氢)转化为氢;并可选择性地形成其药学上可接受的盐。