Chirality Transfer in Gold(I)-Catalysed Direct Allylic Etherifications of Unactivated Alcohols: Experimental and Computational Study
作者:Graeme Barker、David G. Johnson、Paul C. Young、Stuart A. Macgregor、Ai-Lan Lee
DOI:10.1002/chem.201501607
日期:2015.9.21
necessary to ensure efficient and general chirality transfer. Computational studies suggest that the efficiency of chirality transfer is linked to the aggregation of the alcohol nucleophile around the reactive π‐bound Au–allylic ether complex. With a single alcohol nucleophile, a high degree of chirality transfer is predicted. However, if three alcohols are present, alternative proton transfer chain mechanisms
金(I)催化的直接烯丙基醚化已成功进行手性转移,得到对映体富集的,γ取代的仲烯丙基醚。我们的研究包括完整的底物范围的筛查,以确定取代基对手性转移的区域选择性,立体选择性和效率的影响,以及控制实验,以阐明手性转移过程的机理精妙之处。至关重要的是,发现必须添加分子筛以确保有效和普遍的手性转移。计算研究表明,手性转移的效率与反应性π键金-烯丙基醚复合物周围的醇亲核试剂的聚集有关。使用单个醇亲核试剂,可以预测高度的手性转移。然而,