(1,2-Diaminoethane-1,2-diyl)bis(<i>N</i>-methylpyridinium) Salts as a Prospective Platform for Designing Recyclable Prolinamide-Based Organocatalysts
作者:Vladislav G. Lisnyak、Alexander S. Kucherenko、Edward F. Valeev、Sergei G. Zlotin
DOI:10.1021/acs.joc.5b01555
日期:2015.10.2
A new efficient and highly recyclable organocatalyst has been developed for asymmetric cross-aldolreactions under neat conditions in ketone–ketone, ketone–aldehyde, and aldehyde–aldehyde systems. The catalyst features two prolinamide fragments and a C2-symmetrical (1,2-diaminoethane-1,2-diyl)bis(N-methylpyridinium) group. The catalyst retained high activity and excellent stereoselection over the operating