(+/-)-N-Methyl-N-[trans-2-(1-pyrrolidinyl)cyclohexyl]-1-phenylcyclopropanecarboxylic amide (1) and its dichloro analog (2) were synthesized. Compounds 1 and 2 are related to the kappa-selective opiate U-50488 in that the benzylic methylene moiety in U-50488 has been replaced by a cyclopropane ring. As compared to U-50488, a 600-fold reduction in kappa-affinity was observed with these 2 compounds; while the reduction in mu-affinity was less than 2-fold. Unlike U-50488, 1 and 2 also show measurable sigma-binding. To explain the observed anomaly, the steric interaction between the N-methyl group and the cyclopropane ring and the tendency of the cyclopropane ring to conjugate with the neighboring phenyl group, both affecting the accessible conformations of the amide side chains of 1 and 2, are considered important factors.
(±)-N-甲基-N-[反式-2-(1-
吡咯烷基)环己基]-1-苯基
环丙烷甲酰胺(1)及其二
氯类似物(2)已被合成。化合物1和2与κ-选择性阿片类药物U-50488相关,因为U-50488中的苄基亚甲基部分已被一个
环丙烷环取代。与U-50488相比,这两种化合物的κ-受体亲和力降低了约600倍,而μ-受体亲和力的降低不到2倍。与U-50488不同,1和2还显示出可观的σ-结合能力。为了解释这一异常现象,认为N-甲基基团与
环丙烷环之间的空间相互作用以及
环丙烷环与邻近苯基集团的共轭趋势是重要因素,两者均影响了1和2的酰胺侧链的可及构象。