| abstract |
Di-N-substituted piperazine or 1,4-di-substituted piperidine compounds in accordance with formula (I) (including all isomers, salts, esters, and solvates), wherein Q, n, R, R<1>, R<2>, R<3>, R<4>, R<21>, R<27>, R<28>, X, and Z are as defined herein are muscarinic antagonists useful for treating cognitive disorders such as Alzheimer's disease. Pharmaceutical compositions and methods of preparation are also disclosed. Also disclosed are synergistic combinations with acetylcholinesterase inhibitors of compounds capable of enhancing acetylcholine release and having the above formula. |