Ion-tagged prolinamide organocatalysts for the direct aldol reaction on-water
Version 2 2024-06-03, 10:51Version 2 2024-06-03, 10:51
Version 1 2016-05-09, 08:57Version 1 2016-05-09, 08:57
journal contribution
posted on 2024-06-03, 10:51authored byDJ Eyckens, HL Brozinski, JP Delaney, L Servinis, S Naghashian, Luke HendersonLuke Henderson
A concise synthesis of two imidazolium ion-tagged prolinamide organocatalysts 3 and 4, varying in anionic component (CF3COO- and PF6 -, respectively) is presented. The latter could be classified as an ionic liquid with a melting point of 66.3 °C, and glass transition temperature of 14.5 °C. The efficiency of each catalyst was compared via a direct aldol reaction revealing a large contrast in catalytic performance, with the catalyst bearing the PF6 - anion being superior. The optimal conditions were determined to be an on-water reaction system, and substrate scoping gave a range of desired aldol products in high conversion (up to >99 %), dr (up to 98:2), and er (up to 96:4). The application of these catalysts to beta-nitrostyrene conjugate addition is also presented. Graphical Abstract: [Figure not available: see fulltext.]
History
Journal
Catalysis letters
Volume
146
Pagination
212-219
Location
Berlin, Germany
ISSN
1011-372X
eISSN
1572-879X
Language
eng
Publication classification
C Journal article, C1 Refereed article in a scholarly journal