Synthesis of quinolinomorphinan derivatives as highly selective δ opioid receptor ligands
摘要:
We have reported previously the novel delta opioid agonist KNT-127 which showed high affinity and selectivity for the delta receptor. Moreover, the analgesic effect of subcutaneously administered KNT-127 was more potent than that of a prototypical delta agonist (-)-TAN-67 in the acetic acid writhing test. This study of the structure-activity relationship of KNT-127 derivatives focused on the introduction of substituents onto the 5'-, 6'-, 7'- or 8'-position of the quinoline ring and revealed that many derivatives with 5'- or 8'-substituents showed high affinities and selectivities for the delta receptor. Especially, SYK-153 with an 8'-OH group showed the highest affinity and the most balanced and highest selectivity for the delta receptor among the synthesized compounds. (C) 2012 Elsevier Ltd. All rights reserved.