Synthesis and transport studies of a new class of cage-annulated chiral macrocycles
作者:Thavendran Govender、Humcha K. Hariprakasha、Hendrik G. Kruger、Alan P. Marchand
DOI:10.1016/s0957-4166(03)00272-6
日期:2003.6
The synthesis of a newclass of chiral pentacycloundecane cage annulated macrocycles is reported. The ability of the chiral hosts to transport racemic phenylglycine methyl ester enantioselectively through a chloroform membrane in a U-tube was compared to that of related pyridine macrocycles. The cage annulated macrocycles showed weak to moderate enantioselectivity and very high rates of transport compared
Two new chromogenic compounds, 5 and 6, and a novel chiral chromogenic calix[4](azoxa)crown-7 8 have been synthesized using a calix[4]arene platform. The starting reagents chiral diamine e and calix[4]arene diacid chloride derivative 7 were prepared conveniently according to recent approaches. The H-1 and C-13 NMR, data showed that these compounds exist in a cone conformation. Compounds 5 and 8 have shown broad absorption bands in UV-vis spectra suggesting their utility in different fields, for example, as sensors for ions as well as for chiral molecules. (C) 2004 Elsevier Ltd. All rights reserved.