Synthesis of Linear (<i>Z</i>
)-α,β-Unsaturated Esters by Catalytic Cross-Metathesis. The Influence of Acetonitrile
作者:Elsie C. Yu、Brett M. Johnson、Erik M. Townsend、Richard R. Schrock、Amir H. Hoveyda
DOI:10.1002/anie.201608087
日期:2016.10.10
Kinetically controlled catalytic cross‐metathesis reactions that generate (Z)‐α,β‐unsaturated esters selectively are disclosed. A key finding is that the presence of acetonitrile obviates the need for using excess amounts of a more valuable terminal alkene substrates. On the basis of X‐ray structure and spectroscopic investigations a rationale for the positive impact of acetonitrile is provided. Transformations
动力学控制的催化交叉复分解反应选择性地产生(Z)-α,β-不饱和酯。一个关键发现是乙腈的存在消除了对使用过量的更有价值的末端烯烃底物的需要。根据X射线结构和光谱学研究,提供了乙腈产生积极影响的基本原理。导致各种E,Z-二烯酸酯的转化也是高度Z-选择性的。通过将其应用于具有生物活性的天然产物(-)-月桂酰亚胺的C1-C12片段的立体选择性合成中,其实用性得到了突显。