Synthetic Studies toward GKK1032s, Novel Antibiotic Antitumor Agents: Enantioselective Synthesis of the Fully Elaborated Tricyclic Core via an Intramolecular Diels−Alder Cycloaddition
作者:Moriteru Asano、Munenori Inoue、Kazuhiro Watanabe、Hideki Abe、Tadashi Katoh
DOI:10.1021/jo0610208
日期:2006.9.1
An enantioselective synthesis of the fully elaborated tricyclic decahydrofluorene core (ABC-ring system) of GKK1032s, novel antimicrobial and antitumor agents, has been accomplished for the first time by employing a highly diastereoselective intramolecular Diels−Alder (IMDA) reaction. The key substrate for the IMDA reaction was efficiently prepared through (i) an intermolecular Diels−Alder reaction
通过高度非对映选择性分子内Diels-Alder(IMDA)反应首次完成了对GKK1032s的详尽阐述的三环十氢芴核(ABC环系统),新型抗微生物剂和抗肿瘤剂的对映选择性合成。通过(i)硅烷氧基二烯与衍生自d-甘露糖醇的旋光烯酮之间的分子间Diels-Alder反应,以构建适当官能化的C环和(ii)CuCl促进的Stille偶联,有效制备了IMDA反应的关键底物(E)-乙烯基碘和乙烯基锡烷的安装,以安装必要的三烯侧链作为关键步骤。