Synthesis of a series of novel N,N-dialkyl-TsDPEN ligands and their application to enantioselective addition of dialkylzinc to benzaldehyde
摘要:
A series of mono- and dialkylated derivatives of C2-symmetric N-tosyl-1,2-diphenylethylene diamines have been prepared and used as ligands for the enantiomeric control of the addition of diethylzinc to aldehydes. Addition products of up to 79% ee were formed. (C) 2008 Elsevier Ltd. All rights reserved.
<i>trans</i>-1,2-Diaminocyclohexane-based sulfonamides as effective hydrogen-bonding organocatalysts for asymmetric Michael–hemiacetalization reaction
作者:Maciej Dajek、Rafał Kowalczyk、Przemysław J. Boratyński
DOI:10.1039/c8cy01199k
日期:——
bifunctional monosulfonamide derivative of DACH was an effective catalyst for Michael addition–hemiacetalization reactions, providing products with ees exceeding 99% under optimized conditions. High enantioselectivities were achieved with just 0.2% mol catalyst loading. The sulfonamide outperformed analogous thiourea and squaramide-based organocatalysts.
Synthesis of a series of novel N,N-dialkyl-TsDPEN ligands and their application to enantioselective addition of dialkylzinc to benzaldehyde
作者:José E.D. Martins、Martin Wills
DOI:10.1016/j.tetasy.2008.04.020
日期:2008.5
A series of mono- and dialkylated derivatives of C2-symmetric N-tosyl-1,2-diphenylethylene diamines have been prepared and used as ligands for the enantiomeric control of the addition of diethylzinc to aldehydes. Addition products of up to 79% ee were formed. (C) 2008 Elsevier Ltd. All rights reserved.