Indenylidene Complexes of Ruthenium: Optimized Synthesis, Structure Elucidation, and Performance as Catalysts for Olefin Metathesis—Application to the Synthesis of the ADE-Ring System of Nakadomarin A
作者:Alois Fürstner、Oliver Guth、Arno Düffels、Günter Seidel、Monika Liebl、Barbara Gabor、Richard Mynott
DOI:10.1002/1521-3765(20011119)7:22<4811::aid-chem4811>3.0.co;2-p
日期:2001.11.19
complex 3 is as good as or even superior to the classical Grubbs carbene 1 in terms of yield, reaction rate, and tolerance towards polar functional groups. Complex 3 turns out to be the catalyst of choice for the synthesis of the enantiopure core segment 77 of the marine alkaloid nakadomarin A 60 comprising the ADE rings of this target. Together with a series of other examples, this particular application
描述了钌苯基茚基亚烷基络合物3的优化且大规模适用的合成,其使用市售的二苯基炔丙醇5作为稳定且方便的卡宾源。通过对该化合物的NMR光谱进行全面分析,排除了先前对该化合物的实际结构的歧义。闭环复分解(RCM)反应的一系列应用表明,在收率,反应速率和对极性官能团的耐受性方面,配合物3与经典的Grubbs卡宾1一样好,甚至更好。络合物3被证明是用于合成包含该靶标的ADE环的海洋生物碱中型抗癌蛋白A 60的对映纯核心链段77的选择催化剂。再加上一系列其他示例,该特定的应用说明了催化剂3特别适合于通过RCM环化中型环。通往nakadomarin A的其他关键步骤是高度选择性的分子内迈克尔加成,将四元中心置于A和D环的交界处,以及醛73与CH2I2,Ti(OiPr)4和活性锌粉的Takai-Nozaki烯化反应。