作者:Aurpon W. Mitra、Marvin M. Hansen、Michael E. Laurila、Stanley P. Kolis、Joseph R. Martinelli
DOI:10.1016/j.tetlet.2013.09.099
日期:2013.11
α-Aminoamides are shown to be useful as ligands in Goldberg amidations. A number of α-aminoamides are examined and the importance of substitution on the α-aminoamides is explored. Acetamide is focused on as the nucleophilic coupling partner due to its low cost, stability and convenience as a protecting group. The initial substrate scope for these catalysts is explored and includes electronically activated
Chiral Lewis Base Catalyzed Highly Enantioselective Reduction of N-Alkyl β-Enamino Esters with Trichlorosilane and Water
作者:Xinjun Wu、Yang Li、Chao Wang、Li Zhou、Xiaoxia Lu、Jian Sun
DOI:10.1002/chem.201003105
日期:2011.3.1
of a chiral Lewisbase catalyst 2, the supposedly moisture‐unfriendly reduction system with trichlorosilane was found to be highly efficient and enantioselective when using water as an additive. For the first time, this method enables the reduction of a broad range of N‐alkyl β‐enamino esters 1 to give N‐alkyl β‐amino esters 3 in good to high yields and with excellent enantioselectivities (see scheme)
Pronounced Self‐Induced Diastereomeric Anisochronism in Anisidine Amino Acid Diamides
作者:Jan‐Michael Menke、Oliver Trapp
DOI:10.1002/chem.202400623
日期:2024.7.2
The emergent properties resulting from selective supramolecular interactions are of significant importance for materials and chemical systems. For the directed use of such properties, a fundamental understanding of the interaction mechanism and the resulting mode of function is necessary for a tailored design. The self‐induced diastereomeric anisochronism effect (SIDA), which occurs in the intermolecular interaction of chiral molecules, generates unique properties such as chiral self‐recognition and nonlinear effects. Here we show that anisidine amino acid diamides lead to extraordinary signal splitting in NMR spectra through supramolecular interaction and homochiral self‐recognition. By systematic experiments we have investigated the underlying SIDA effect, explored its limits and finally successfully utilized it in the determination of enantiomeric ratios by NMR spectroscopy of chiral ‘SIDA‐inactive’ compounds such as thalidomide.