作者:Adrian S. Culf、Miroslava Čuperlović-Culf、Daniel A. Léger、Andreas Decken
DOI:10.1021/ol501102b
日期:2014.5.16
A convenient and efficient methodology for the head-to-tail macrocyclization of small 3-mer, 4-mer, and 5-mer α-peptoid acids (9-, 12-, and 15-atom N-substituted glycine oligomers) is described. The cyclic trimer has a ccc amide sequence in the crystal structure, whereas the tetramer has ctct and the pentamer has ttccc stereochemistry. NMR analysis reveals rigid structures in solution. These synthetic