Novel N-heterocyclyl-4-piperidinamines wherein said heterocyclic radical is an optionally substituted 1H-benzimidazol-2-yl or 3H-imidazo[4,5-b]pyridin-2-yl radical, said compounds being useful as antihistaminic agents.
1,3-dihydro-1-[(1-piperidinyl)alkyl]- 2H-benzimidazol-2-one derivatives of the formula
wherein
R1 and R2 are each independently selected from the group consisting of hydrogen, halo, lower alkyl and trifluoromethyl;
R3 is a member selected from the group consisting of hydrogen, lower alkyl and lower alkylcarbonyl;
lk is a lower alkylene radical;
R4 and R5 are each independently selected from the group consisting of hydrogen and lower alkyl;
X is a member selected from the group consisting of
wherein said R2 is hydrogen or lower alkyl and said q is the integer 2 or 3; and
Ar is a member selected from the group consisting of phenyl, substituted phenyl, pyridinyl and thienyl, wherein said substituted phenyl has from 1 to 3 substituents each independently selected from the group consisting of halo, lower alkyl, lower alkyloxy, amino, nitro and trifluoromethyl,
which compounds are potent serotonin-antagonists and central nervous system depressants having a capability as antiemetic neuroleptic and anti-congestive agents.
N-Heterocyclyl-4-piperidinamines, methods for their preparation, pharmaceutical compositions comprising them, intermediates therefor, and method for the preparation of the intermediates