The present invention relates to substantially pure piperidine derivative compounds of the formulae:
wherein
R
1
is hydrogen or hydroxy;
R
2
is hydrogen;
or R
1
and R
2
taken together form a second bond between the carbon atoms bearing R
1
and R
2
;
R
3
is —COOH or —COOR
4
;
R
4
has 1 to 6 carbon atoms;
A, B, and D are the substituents of their respective rings, each of which may be different or the same and are hydrogen, halogens, alkyl, hydroxy, alkoxy, or other substituents.
A process of preparing such piperidine derivative compounds in substantially pure form is also disclosed.
本发明涉及下列式的基本纯度
吡啶衍生物化合物:
其中,
R1是氢或羟基;
R2是氢;或者R1和R2结合形成连接R1和R2的碳原子之间的第二键;
R3是—COOH或—COOR4;
R4具有1至6个碳原子;
A、B和D是它们各自环的取代基,每个取代基可以不同,也可以相同,是氢、卤素、烷基、羟基、烷氧基或其他取代基。
本发明还公开了制备这种基本纯度
吡啶衍生物化合物的方法。