206358-62-5Relevant articles and documents
Synthesis of functionalized, unsymmetrical 1,3,4,6-tetrasubstituted 2,5-diketopiperazines
Tullberg, Marcus,Grotli, Morten,Luthman, Kristina
, p. 195 - 199 (2007/10/03)
A general and efficient method for the synthesis of unsymmetrical 1,3,4,6-tetrasubstituted 2,5-diketopiperazines (DKPs) is described. Cyclization of N-amide alkylated dipeptide methyl esters, followed by alkylation, furnished the corresponding tetrasubsti
Dynamic resolution of α-bromo-α-alkyl esters using N-methyl pseudoephedrine as a chiral auxiliary: Asymmetric syntheses of α-amino acid derivatives
Lee, Sang-Kuk,Nam, Jiyoun,Yong, Sun Park
, p. 790 - 792 (2007/10/03)
N-Methyl pseudoephedrine mediated dynamic resolution of α-bromo-α-alkyl esters in nucleophilic substitution reaction has been investigated. Best results are obtained when α-bromo-α-alkyl esters 1, 4 and 5 are allowed to equilibrate before the addition of nucleophile. This simple epimerization-substitution sequence provides a practical protocol for asymmetric syntheses of α-amino acid derivatives 2, 7 and 8 up to 98:2 enantiomeric ratio.