Two bis-C-aminoglycosyl arenes containing the angolosamine and the vancosamine moieties, which are potentially useful as the D-ring fragments of the pluramycin-type antibiotics, were efficiently synthesized by the O→C-glycoside rearrangement based strategy.
Two Axles Threaded Using a Single Template Site: Active Metal Template Macrobicyclic [3]Rotaxanes
作者:Stephen M. Goldup、David A. Leigh、Paul R. McGonigal、Vicki E. Ronaldson、Alexandra M. Z. Slawin
DOI:10.1021/ja9080716
日期:2010.1.13
to rotaxanes normally require at least n - 1 template sites to interlock n components. Here we describe the one-pot synthesis of [3]rotaxanes in which a single metal template site induces formation of axles through each cavity of a bicyclic macrocycle. Central to the approach is that a portion of the bicyclic molecule acts as a ligand for a transition metal ion that mediates covalent bond formation
s: An efficient method for bis-C-glycosylation of resorcinol derivatives was developed by utilizing the O→C-glycoside rearrangement, where each of the two phenols serves as the pivot for selective and high-yield installation of two same or different sugar moieties.