Carbonyl–Olefin Cross‐Metathesis Through a Visible‐Light‐Induced 1,3‐Diol Formation and Fragmentation Sequence
作者:Lena Pitzer、Frederik Sandfort、Felix Strieth‐Kalthoff、Frank Glorius
DOI:10.1002/anie.201810221
日期:2018.12.3
cross‐metathesis is described. Photoinduced hole catalysis was used to promote the formation of 1,3‐diols from aldehydes and styrenes, which were then readily fragmented under acidic conditions to form the cross‐metathesis products. The use of 1,3‐diols as intermediates, rather than the energetically more demanding oxetanes, provides a new, orthogonal mechanistic strategy for carbonyl–olefin cross‐metathesis.
描述了可见光介导的羰基烯烃交叉复分解方法。光诱导空穴催化用于促进醛和苯乙烯形成1,3-二醇,然后在酸性条件下容易裂解形成交叉复分解产物。使用1,3-二醇作为中间体,而不是对能量要求更高的氧杂环丁烷,为羰基烯烃交叉复分解提供了一种新的正交机理。此外,这种方法不需要任何金属,配体或添加剂,并为产品提供了高水平的E。 选择性。提供了一种机械原理,并得到了理论计算和实验的支持。此外,还介绍了一种新的基于a啶的光催化剂的实用合成方法,包括完整的表征。