申请人:Farmitalia Carlo Erba S.r.l.
公开号:US05459161A1
公开(公告)日:1995-10-17
Substituted benzofuran derivatives of the formula (I): ##STR1## wherein one of R.sub.1 and R.sub.2 is hydrogen or halogen and the other is, independently, an amino group or a C.sub.2 -C.sub.4 alkanoyl amino group; R.sub.3 is hydrogen; a linear or branched C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or C.sub.2 -C.sub.4 alkoxycarbonyl group; halogen; or phenyl unsubstituted or substituted by a C.sub.1 -C.sub.4 alkyl group; A is a group --(CH.sub.2).sub.n -Het wherein Het is an optionally substituted heteromonocyclic or heterobicyclic ring containing one or two nitrogen atoms, and n is zero or an integer of 1 to 3; and the symbol ..... represents a single or double bond; may be prepared by a process comprising reacting a compound of formula II: ##STR2## in which L is a leaving group and R.sub.4 is hydrogen or a carboxy protecting group, with a compound of formula III; R'.sub.3 --C.dbd.C--R'.sub.3 III to obtain a compound of formula IV; ##STR3## which is then cyclized to obtain a compound of formula V; ##STR4## which is reacted with a compound of formula VI; H.sub.2 N--A VI.
公式(I)的苯并呋喃衍生物,其中R.sub.1和R.sub.2中的一个是氢或卤素,另一个是独立的氨基或C.sub.2 -C.sub.4烷酰氨基;R.sub.3是氢;线性或支链的C.sub.1 -C.sub.4烷基,C.sub.1 -C.sub.4烷氧基或C.sub.2 -C.sub.4烷氧羰基;卤素;或苯基未取代或被C.sub.1 -C.sub.4烷基取代;A是一个基团--(CH.sub.2).sub.n -Het,其中Het是一个可选择取代的杂单环或杂双环,含有一个或两个氮原子,n为零或1到3的整数;符号.....代表单键或双键;可以通过以下过程制备:将公式II的化合物与公式III的化合物反应以获得公式IV的化合物;然后将其环化以获得公式V的化合物;然后与公式VI的化合物反应。