Expedient Asymmetric Synthesis of All Four Isomers of <i>N,N</i><i>‘</i>-Protected 2,3-Diaminobutanoic Acid
作者:Andrea J. Robinson、Pauline Stanislawski、Dean Mulholland、Linnan He、Hui-Yin Li
DOI:10.1021/jo001152f
日期:2001.6.1
2,3-Diaminobutanoic acid (DAB) is found in several peptide antibiotics, toxins, and biologically active molecules. This paper describes the practical and highly enantioselective synthesis of allfour N,N'-protected DAB stereoisomers using an asymmetric Rh(I)-phosphine-catalyzed hydrogenation of isomeric enamides as the key step. Thermal and photochemical isomerization of the enamide hydrogenation substrates