Compounds of Formula I
wherein R1, R2, R3 and R4 are as defined in the specification, enantiomers thereof, pharmaceutically acceptable salts thereof, processes for preparing them, pharmaceutical compositions containing them and their use in therapy, especially for treatment of conditions associated with reductions in nicotinic transmission. The compounds of the invention enhance the efficacy of agonists at nicotinic receptors.
本发明的化合物I式中,其中R1、R2、R3和R4的定义如规范中所述,其对映异构体,其药学上可接受的盐,制备它们的方法,包含它们的制药组合物以及它们在治疗中的应用,特别是用于治疗与
尼古丁传递减少有关的疾病。本发明的化合物增强了
尼古丁受体激动剂的功效。