Synthesis of poison-frog alkaloids 233A, 235U, and 251AA and their inhibitory effects on neuronal nicotinic acetylcholine receptors
作者:Naoki Toyooka、Soushi Kobayashi、Dejun Zhou、Hiroshi Tsuneki、Tsutomu Wada、Hideki Sakai、Hideo Nemoto、Toshiyasu Sasaoka、H. Martin Garraffo、Thomas F. Spande、John W. Daly
DOI:10.1016/j.bmcl.2007.08.045
日期:2007.11
We previously reported that the synthetic quinolizidine 1-epi-2071 is a relatively selective blocker of 0 nicotinic acetylcholine receptors. We now synthesized the analogous poison frog alkaloids 233A, 235U, and 251AA, and investigated the biological activities at two major types of neuronal nicotinic receptors. Electrophysiological study showed that the alkaloid 233A blocked alpha 7 and alpha 4 beta 2 currents with similar potencies. Alkaloids 235U and 251AA also showed similar potencies for blockade of a7 and alpha 4 beta 2 currents. Thus, based on these studies, it would appear that C4 substituents greater in length than the allyl of 1-epi-2071 reduce alpha 7-potency without affecting alpha 4 beta 2-potency. (c) 2007 Elsevier Ltd. All rights reserved.