Synthesis of new opioid derivatives with a propellane skeleton and their pharmacology. Part 2: Propellane derivatives with an amide side chain
摘要:
We designed and synthesized propellane derivatives with a 6- or 7-amide side chain on the basis of the active conformation of the kappa selective agonist nalfurafine. The 6-amides showed high affinities for the kappa receptor, and one of the 6 beta-amides showed higher kappa selectivity than nalfurafine. On the other hand, although the affinities of the 7-amides decreased compared to the 6-amides, some 7 alpha-amides showed the highest selectivities for the kappa receptor among the tested compounds. The affinities of 7 beta-isomers were extremely low, which was postulated to result from the shielding effect of the 7 beta-amide side chain against the lone electron pair on the 17-nitrogen. This is the first conformational information about the 7-amide side chain in propellane derivatives. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis of new opioid derivatives with a propellane skeleton and their pharmacology. Part 2: Propellane derivatives with an amide side chain
摘要:
We designed and synthesized propellane derivatives with a 6- or 7-amide side chain on the basis of the active conformation of the kappa selective agonist nalfurafine. The 6-amides showed high affinities for the kappa receptor, and one of the 6 beta-amides showed higher kappa selectivity than nalfurafine. On the other hand, although the affinities of the 7-amides decreased compared to the 6-amides, some 7 alpha-amides showed the highest selectivities for the kappa receptor among the tested compounds. The affinities of 7 beta-isomers were extremely low, which was postulated to result from the shielding effect of the 7 beta-amide side chain against the lone electron pair on the 17-nitrogen. This is the first conformational information about the 7-amide side chain in propellane derivatives. (C) 2012 Elsevier Ltd. All rights reserved.