566898-20-2Relevant articles and documents
Synthetic studies on himbacine, a potent antagonist of the muscarinic M2 subtype receptor. Part 2: Synthesis and muscarinic M2 subtype antagonistic activity of the novel himbacine congeners modified at the C-3 position of lactone moiety
Takadoi, Masanori,Yamaguchi, Kentaro,Terashima, Shiro
, p. 1169 - 1186 (2007/10/03)
With an aim to disclose the convergency and flexibility of our previously explored synthetic route to natural himbacine 1, and moreover, to clarify some novel aspects of the structure-activity relationships of 1, we prepared various structural types of novel himbacine congeners, 3-demethylhimbacine (3-norhimbacine) 2 and 4-epi-3-demethylhimbacine (4-epi-3-norhimbacine) 4-epi-2 and their enantiomers (ent-2 and ent-4-epi-2), 11-methylhimbacine 3, and 3-epihimbacine 4 in optically pure forms by employing our methodology. All of the synthesized congeners correspond to the compounds modified at the C-3 position of γ-lactone moiety involved in 1. Among these congeners, 3-demethylhimbacine (3-norhimbacine) 2 was found to exhibit more potent muscarinic M2 receptor binding affinity than natural 1.
