Compounds having the formula R.sup.5 O--A--NR.sup.4 --R.sup.2 (V) where R.sup.2 is a heteroaryl group linked to the remainder of the molecule via a carbon atom adjacent a nitrogen atom and R.sup.4 and R.sup.5 are both hydrogen atoms or together represent --SO-- or --SO.sub.2 -- and A is C.sub.2 -C.sub.4 alkylene optionally substituted by one or more lower alkyl groups are novel intermediates in the preparation of pharmaceutically useful piperazine derivatives as end compounds. The compounds having formula V where R.sup.4 and R.sup.5 are hydrogen may be prepared by a rearrangement of a compound having the formula (VI). R.sup.2 O--A--NH.sub.2 (VI)
具有
化学式R.sup.5 O--A--NR.sup.4 --R.sup.2(V)的化合物,其中R.sup.2是通过邻近氮原子的碳原子与分子余下部分相连的杂环烷基团,而R.sup.4和R.sup.5均为氢原子或一起代表--SO--或--SO.sub.2--,A为C.sub.2-C.sub.4烷基烯,可选择地被一个或多个较低烷基基团取代,是制备在制药上有用的
哌嗪衍
生物作为末端化合物的新中间体。具有
化学式V的化合物,其中R.sup.4和R.sup.5为氢,可以通过对具有
化学式(VI)的化合物进行重排制备。R.sup.2 O--A--NH.sub.2(VI)