作者:Dan Yang、Bing Li、Fei-Fu Ng、Yi-Long Yan、Jin Qu、Yun-Dong Wu
DOI:10.1021/jo010376a
日期:2001.11.1
Chiral alpha -aminoxy acids of various side chains were synthesized with high optical purity starting from chiral alpha -amino acids. The conformations of diamides 13a-e, 15, and 16 were probed by using NMR, FT-IR, and CD spectroscopic methods as well as X-ray crystallography. The right-handed turns with eight-membered-ring intramolecular hydrogen bonds between adjacent residues (called the N-O turns) were found to be preferred for D-aminoxy acid residues, and they were independent of the side chains. The rigid chiral N-O turns should have great potential in molecular design.