Using a TLC autographic assay for radical-scavenging activity with the ABTS radical, the presence of lipophilic antioxidants in the larvae of the wild bruchid seed beetle Bruchidius dorsalis was detected. Assay-guided fractionation of the CHCl3-soluble fraction of the larvae resulted in the isolation of new glycerolipids, designated dorsamin-A763, -A737, -A765, -A739, and -A767, comprising 1,2-diacyl-sn-glycero-3-dehydrophenylalanine ester structural units. The ABTS radical scavenging activity of the dorsamin-A's was comparable with or stronger than that of Trolox.
Cu<sup>II</sup>/TEMPO-Promoted One-Pot Synthesis of Highly Substituted Pyrimidines from Amino Acid Esters
作者:Nini Zhou、Tao Xie、Zhongle Li、Zhixiang Xie
DOI:10.1002/chem.201405447
日期:2014.12.22
A novel, Cu(OAc)2/TEMPO promoted one‐step approach for the preparation of fully substitutedpyrimidinesfrom readily available aminoacidesters has been described. In this reaction, the aminoacidesters act as the only NC sources for the construction of corresponding pyrimidines. The mechanism of this process includes oxidative dehydrogenation, the generation of an imine radical, and a formal [3+3]