A chiral organocatalytic polymer-based monolithic reactor
作者:Valerio Chiroli、Maurizio Benaglia、Alessandra Puglisi、Riccardo Porta、Ravindra P. Jumde、Alessandro Mandoli
DOI:10.1039/c4gc00031e
日期:——
properly modified enantiomericallypure imidazolidinone inside a stainless steel column in the presence of dodecanol and toluene as porogens afforded the first example of a chiral organocatalyst immobilized onto a monolithic reactor. Organocatalyzed cycloadditionsbetween cyclopentadiene and cinnamic aldehyde were performed under continuous-flow conditions; by optimizing the experimental set up, excellent
The invention provides a heterogeneous catalyst comprising a catalytic group coupled to a mesocellular siliceous foam support. The catalytic group is capable of catalysing a reaction selected from the group consisting of a Friedel-Craft reaction and a Diels-Alder reaction.
Chiral GAP catalysts of phosphonylated imidazolidinones and their applications in asymmetric Diels–Alder and Friedel–Crafts reactions
作者:Shuo Qiao、Junming Mo、Cody B. Wilcox、Bo Jiang、Guigen Li
DOI:10.1039/c6ob02801b
日期:——
The design and synthesis of recyclable imidazolidinone catalysts using GAP chemistry/technique was described. Their applications in asymmetric Diels–Alder and Friedel–Crafts reactions with α,β-unsaturatedaldehydes resulted in excellent yields and higher enantioselectivities than previous processes. As recyclable small molecular catalysts, phosphonylated imidazolidinones can be recovered and reused
描述了使用 GAP 化学/技术设计和合成可回收咪唑啉酮催化剂。它们在与 α,β-不饱和醛的不对称 Diels-Alder 和 Friedel-Crafts 反应中的应用比以前的工艺产生了优异的产率和更高的对映选择性。作为可回收的小分子催化剂,膦酰化咪唑啉酮可以回收并重复使用最多三次,而不会导致催化活性显着下降。
Enantioselective Catalysis over Chiral Imidazolidin-4-one Immobilized on Siliceous and Polymer-Coated Mesocellular Foams
作者:Yugen Zhang、Lan Zhao、Su Seong Lee、Jackie Y. Ying
DOI:10.1002/adsc.200600240
日期:2006.10
A highly efficient and enantioselective organocatalyst, imidazolidin-4-one, has been successfully immobilized on siliceous MCF and polymer-coated MCF. The resulting heterogenized catalyst demonstrated excellent catalyticperformance and recyclability for Friedel–Crafts alkylation and Diels–Aldercycloaddition. The performance of the supported catalysts in relation to the surface environment of siliceous