Efficient synthesis of 2,5-diketopiperazines using microwave assisted heating
作者:Marcus Tullberg、Morten Grøtli、Kristina Luthman
DOI:10.1016/j.tet.2006.05.010
日期:2006.7
In this study a general, efficient and environmentally benign solution phase synthesis of 2,5-diketopiperazines (DKPs) using microwave assisted heating in water is described. A series of 11 structurally different DKPs have been synthesized from dipeptide methyl esters. A range of common laboratory solvents have been tested as well as different reaction times and temperatures. Both classic thermal and
Twenty kinds of cyclic dipeptides containing L-leucine were synthesized, and their antioxidant activity against (OH)-O-center dot and O-2(center dot-) was investigated. Compounds possessing polar amino acid residues, such as Asp, Cys, Glu, Lys, Pro, Ser, and Trp, exhibited higher antioxidant activity against (OH)-O-center dot than vitamin E. However, only cyclo(L-Cys-L-Leu) scavenged O-2(center dot-). (C) 2012 Elsevier Ltd. All rights reserved.
Heyns; Rolle, Chemische Berichte, 1959, vol. 92, p. 2439,2443,2444