The uncommon amino-acid 2-methylalanine (α-aminoisobutyric acid, Aib) was investigated by 13C-NMR. The chemical shifts of amino- or carboxy-protected derivatives of Aib and of protected oligopeptides are discussed with respect to neighbouring groups and amino acids. The pH-dependence of the 13C-NMR spectra of Aib, Aib-Ala, Ala-Aib, Aib-Ala-Aib and Aib-Ala-Aib-Ala-Aib was studied. Using these examples
Synthesis of new cyclic imides derivatives with potential hypolipidemic activity
作者:Mohamed A. El-Zahabi、Laila M. Gad、Faida H. Bamanie、Zohair Al-Marzooki
DOI:10.1007/s00044-010-9492-1
日期:2012.1
AbstractCertain new nitrogen-substituted derivatives of cyclicimidesphthalimide (a), 1,8-naphthalimide (b), and diphenimide (c), were synthesized aiming to obtain potent hypolipidemic agents. Thus, 2-(N-imido) propanoic acids, 2-(N-phthalimido)-2-methylpropionic acid, and their ethyl esters were synthesized (Target derivative A). Also their corresponding N-substituted-2-(N-imido) propionamides and