process that stereoselectively led to bi- and tricyclic compounds in moderate to excellent yields. Four X-ray crystal structure analyses unequivocally defined the structure of crucial cyclization products. The relative configuration of the precursor compounds is essentially transferred to that of the products and the formed hydroxy group in the newly generated cyclohexane ring is consistently in trans-arrangement
从具有邻
碘苄基的γ-
酮酸酯开始,我们研究了
钯催化的环化过程,该过程立体选择性地产生了中等至极好的收率的双环和
三环化合物。四种X射线晶体结构分析明确定义了关键环化产物的结构。前体化合物的相对构型基本上转移到产物的相对构型,并且新生成的
环己烷环中形成的羟基相对于甲氧基羰基始终处于反式排列。提出了一种过渡态模型来解释观察到的立体
化学结果。该
钯催化的Barbier型反应需要将
钯(II)还原回到
钯(0),这显然是通过本发明的
三乙胺实现的。