The stereoselective preparation of substituted pyrrolidines using titanium- and zirconium-mediated diene metallabicyclisation methodology: the total synthesis of (−)-α-kainic acid
作者:Andrew D. Campbell、Tony M. Raynham、Richard J. K. Taylor
DOI:10.1039/b005853j
日期:——
employed as the key step in a partial synthesis of (−)-α-kainic acid starting from D-serine, but the key metallabicyclisation sequence proceeded with poor stereocontrol. By contrast, the total synthesis of (−)-α-kainic acid starting from L-serine was accomplished using a titanium-mediated cyclisation sequence which proceeded with excellent stereocontrol. Novel kainoids and piperidines are also reported
锆和钛介导的二烯金属环化-消除-官能化已被比较,对比和用于制备3,4-二取代和2,3,4-三取代 吡咯烷具有高收率和出色的立体选择性。锆介导的方法已被用作部分合成(-)-α-海藻酸的关键步骤,从D-丝氨酸,但关键的金属环化顺序进行时立体声控制较差。相比之下,(-)-α-海藻酸的总合成从大号丝氨酸使用钛介导的环化序列完成了该反应,该序列进行了出色的立体控制。新型类胡萝卜素和哌啶 也有报道。