Stereoselective DielsAlder Reactions Promoted under Continuous-Flow Conditions by Silica-Supported Chiral Organocatalysts
作者:Riccardo Porta、Maurizio Benaglia、Valerio Chiroli、Francesca Coccia、Alessandra Puglisi
DOI:10.1002/ijch.201300106
日期:2014.4
with silica bearing chiral organocatalysts to realize chiral “homemade” reactors. The influence of the material properties and immobilization procedures on the chemical and stereochemical activities of the chiral HPLC columns was studied by performing organocatalyzed DielsAlder reactions between cyclopentadiene and α,β‐unsaturated aldehydes under continuous‐flow conditions. In some cases, excellent
通过不同的固定化技术,用对映体纯的咪唑烷酮将具有不同形态特性的二氧化硅纳米颗粒官能化;然后,在不锈钢柱上装载带有二氧化硅的手性有机催化剂,以实现手性“自制”反应器。在手性HPLC柱的化学和立体化学活动的材料特性和固定程序的影响进行了研究通过执行organocatalyzed狄尔斯在连续流动条件下,环戊二烯与α,β-不饱和醛之间的色反应。在某些情况下,获得了极好的对映选择性,因此表明催化反应器可以有效地连续生产对映体富集的环加合物超过200小时。尽管与稍低的对映选择性相关,有机催化塔的再生也部分完成,从而将反应器的“寿命”延长至超过300小时。