Synthesis and evaluation of opioid receptor-binding affinity of elaeocarpenine and its analogs
作者:Haruaki Kurasaki、Iwao Okamoto、Nobuyoshi Morita、Osamu Tamura
DOI:10.1016/j.bmcl.2010.01.062
日期:2010.3
Both enantiomers of elaeocarpenine (1) and its analogs, 21, 22, 25, and 27, were synthesized from bicyclic aldehydes 8-10 via a flexible route previously established for total synthesis of grandisines, and their binding affinities for mu-, kappa- and delta-opioid receptor subtypes were evaluated. We found that (9R)-1 exhibited higher affinity than (9S)-1 for all the subtypes, but the enantiomers showed little subtype selectivity. Analogs 21 having a pyrrolizidine skeleton and 27 having a stemona-type skeleton in place of the indolizidine unit of (9S)-1 showed mu-selective and mu-, kappa-selective binding, respectively. (C) 2010 Elsevier Ltd. All rights reserved.