Novel antihistaminic piperidine derivatives and intermediates for the preparation thereof

摘要

This invention relates to novel compounds of formula: wherein R1 is H or C1-C6alkyl and the C1-C6alkyl moiety is straight or branched; R2 and R3 are each independently C1-C6alkyl and the C1-C6alkyl moiety is straight or branched; or stereoisomers or pharmaceutically acceptable acid addition salt thereof.