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
1
wherein
W represents —C(═O)— or —CH(OH)—;
R
1
represents hydrogen or hydroxy;
R
2
represents hydrogen;
R
1
and R
2
taken together form a second bond between the carbon atoms bearing R
1
and R
2
;
n is an integer of from 1 to 5;
m is an integer 0 or 1;
R
3
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 R
1
and R
2
are ta to form a second bond between the carbon R
1
and R
2
or where R
1
represented hydroxy integer 0.
本发明涉及一种新型中间体和过程,其在制备某些抗
组胺哌啶衍
生物的过程中有用,该衍
生物的
化学式为1,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碳原子之间的第二个键;n为1到5的整数;m为0或1的整数;R3为—COOH或—COOalkyl,其中烷基具有1到6个碳原子,是直链或支链,A的每个代表氢或羟基;以及其药学上可接受的盐和单个光学异构体,但其中当R1和R2连接成连接R1和R2碳原子之间的第二个键时,或者当R1代表羟基时,n为0。