Synthesis and evaluation of opioid receptor-binding affinity of elaeocarpenine and its analogs
摘要:
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.
respect to data, studies have mainly focused on stereoconvergent reactions of racemic alkyl electrophiles. Here, we report an enantioselective cross-electrophile aryl-alkenylation reaction of unactivatedalkenes. This method provides access to a number of biologically important chiral molecules such as dihydrobenzofurans, indolines, and indanes. The incorporated alkenyl group is suitable for further
Copper(<scp>i</scp>)-catalyzed electrophilic thiocyanation/dearomatization/spirocyclization of benzofurans to synthesize benzannulated spiroketals
作者:Ying He、Qing Wang、Hongquan Yin、Fu-Xue Chen
DOI:10.1039/d3ob00438d
日期:——
An electrophilic dearomatizative thiocyanation/spirocyclization of benzofurans withN-thiocyanatosuccinimide has been accomplished by Lewis acid catalysis with CuOTf under mild conditions.
Ligand-Enabled Palladium-Catalyzed [3 + 2] Annulation of Aryl Iodides with Maleimides via C(sp3)–H Activation
作者:Feng Wei、Yanghui Zhang
DOI:10.1021/acs.orglett.4c02138
日期:2024.7.26
Palladium-catalyzed intermolecular [3 + 2] annulation reactions via C–Hactivation represent a powerful and charming tool for assembling cyclopentanes. Herein, we have developed a strategy for the palladium-catalyzed intermolecular alkene-relayed annulation reaction of aryl iodides and maleimides via C(sp3)–H activation for the construction of polycyclic structures. In contrast to directed-group-enabled