INTERMEDIATES USEFUL FOR THE PREPARATION OF ANTIHISTAMINIC PIPERIDINE DERIVATIVE

摘要

The present invention relates to process for preparing antihistaminic piperidine derivative, specifically fexofenadine and its pharmaceutically acceptable salts by using novel synthetic intermediates of following formula (I), wherein R is lower alkyl; R 2 is H, cyclopropyl, R 1 is alkyl, 4-(hydroxy-diphetiyl-methyl)-piperidin-l-yl.