(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
Highly enantioselective aldol reaction of acetone with β,γ-unsaturated α-keto esters promoted by simple chiral primary–tertiary diamine catalysts
作者:Lin Peng、Liang-Liang Wang、Jian-Fei Bai、Li-Na Jia、Yun-Long Guo、Xi-Ya Luo、Fei-Ying Wang、Xiao-Ying Xu、Li-Xin Wang
DOI:10.1039/c1ob05607g
日期:——
A series of primary–tertiary diamine catalysts were successfully applied to promote the enantioselective aldol reaction of acetone with β,γ-unsaturatedα-ketoesters in excellent yields (up to 99%) and enantioselectivities (up to 96% ee).