Synthetic studies of himbacine, a potent antagonist of the muscarinic M2 subtype receptor 1. Stereoselective total synthesis and antagonistic activity of enantiomeric pairs of himbacine and (2′S,6′R)-diepihimbacine, 4-epihimbacine, and novel himbacine congeners
作者:Masanori Takadoi、Tadashi Katoh、Akihiro Ishiwata、Shiro Terashima
DOI:10.1016/s0040-4020(02)01358-3
日期:2002.12
Total synthesis of an enantiomeric pair of himbacine 1 and ent-1 was achieved in a highly stereoselective manner by employing an intermolecular Diels–Alder reaction of tetrahydroisobenzofuran 8 with chiral furan-2(5H)-one (S)-9 and (R)-9, respectively, as a key step. An enantiomeric pair of (2′S,6′R)-diepihimbacine 24 and ent-24, 4-epihimbacine 4-epi-1, and novel himbacine congeners bearing the same
的对映体对的喜巴辛的全合成1和ENT - 1通过采用的四氢异分子间Diels-Alder反应以高立体选择性的方式实现8与手性呋喃-2(5 ħ) -酮(小号- )9和(ř)-9作为关键步骤。的对映体对(2'小号,6' - [R)-diepihimbacine 24和ENT - 24,4- epihimbacine 4-外延- 1,和新颖的喜巴辛同源轴承相同三环部分为的1也成功通过利用键合成中间体,用于制备1,建立所述探索合成路线的收敛性和灵活性。所有使用的合成化合物均经过毒蕈碱M 2亚型受体结合亲和力测定,揭示了1的结构-活性关系的新方面。