The present invention is related to a novel intermediates and processes which are useful in the preparation of certain antihistaminic piperidine derivatives of the formula
wherein
W represents —C(═O)— or —CH(OH)—;
R1 represents hydrogen or hydroxy;
R2 represents hydrogen;
R1 and R2 taken together form a second bond between the carbon atoms bearing R1 and R2;
n is an integer of from 1 to 5;
m is an integer 0 or 1;
R3 is —COOH or —COOalkyl wherein the alkyl moiety has from 1 to 6 carbon atoms and is straight or branched each of A is hydrogen or hydroxy; and
pharmaceutically acceptable salts and individual optical isomers thereof, with the proviso that where R1 and R2 are taken together to form a second bond between the carbon atoms bearing R1 and R2 or where R1 represented hydroxy, m is an integer 0.
本发明涉及一种新型中间体和工艺,用于制备某些抗
组胺哌啶衍
生物,其
化学式为
其中
W代表—C(═O)—或—CH(OH)—;
R1代表氢或羟基;
R2代表氢;
R1和R2一起形成连接R1和R2所带的碳原子之间的第二键;
n为1至5的整数;
m为0或1的整数;
R3为—COOH或—COO烷基,其中烷基部分具有1至6个碳原子,直链或支链,A的每个是氢或羟基;
以及其药学上可接受的盐和各自的光学异构体,但其中R1和R2一起形成连接R1和R2所带的碳原子之间的第二键,或者R1代表羟基时,m为整数0。