allows the facile synthesis of various bicyclo[n.3.1]alkenes, especially a set of highly strained bicyclo[5.3.1]alkenes. Further derivatizations of the silyl group and the resultant double bond of bicyclo[5.3.1]undecene 2 f enabled a concise synthesis of A‐B‐C ring skeleton of taxol. Density functional theory (DFT) calculations suggest that the introduction of a bulky silyl group at C‐5 position of the
本文中,我们报告了一种基于可移除甲硅烷基的构象控制的RCM的新策略,该策略可轻松合成各种双环[ n .3.1]烯烃,尤其是一组高应变双环[5.3.1]烯烃。甲硅烷基的进一步衍生化和双环[5.3.1]十一碳烯2 f的双键使紫杉醇的A-B-C环骨架得以简明合成。密度泛函理论(DFT)计算表明,在1,3-二烯基环己醇底物C-5位置引入庞大的甲硅烷基基团可显着降低双轴构象异构体(相对于RCM)和赤道构象异构体(交叉复分解)之间的能量偏置间隙。 ,从而有利于预期的RCM反应产生具有挑战性的桥连分子。
Diastereoselective 1,4-addition of various nucleophiles to 5-trimethylsilyl-2-cyclohexenone: synthesis of (+)-ramulosin