The present invention relates to a process for the preparation of a compound of the following formula (I)
wherein
one of R₁ and R₂ is hydrogen or halogen and the other is independently, an amino group or a C₂-C₄ alkanoyl amino group;
R₃ is hydrogen; a linear or branched alkyl, C₁-C₄ alkoxy or C₂-C₄ alkoxycarbonyl group; halogen; or phenyl unsubstituted or substituted by a C₁-C₄ alkyl group;
A is a group -(CH₂)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 and the pharmaceutically acceptable salts thereof.
The compounds of the invention can be useful as 5HT3 receptor antagonists.
本发明涉及一种下式(I)化合物的制备工艺
其中
R₁ 和 R₂ 中的一个是氢或卤素,另一个独立地是
氨基或 C₂-C₄ 烷酰基
氨基;
R₃ 是氢;直链或支链烷基、C₁-C₄ 烷氧基或 C₂-C₄ 烷氧羰基;卤素;或未被 C₁-C₄ 烷基取代或被 C₁-C₄ 烷基取代的苯基;
A是基团-(CH₂)n-Het,其中Het是含有一个或两个氮原子的任选取代的杂单环或杂双环,n是零或1至3的整数;符号....¯代表单键或双键及其药学上可接受的盐。
本发明的化合物可用作 5HT3 受体拮抗剂。