The present invention relates to substantially pure piperidine derivative compounds of the formulae:
1
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.
本发明涉及公式为: 1 的基本纯度
吡啶衍生物化合物,其中R1为氢或羟基;R2为氢;或R1和R2一起形成负责R1和R2的碳原子之间的第二个键;R3为-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或相同,并且可以是氢、卤素、烷基、羟基、烷氧基或其他取代基。本发明还公开了制备此类
吡啶衍生物化合物的方法,其具有基本纯度。