Synthesis of new proton-ionizable crown ether compounds containing substituted lh-pyridin-4-one subcyclic units
作者:Peter Huszthy、Julia Kertesz、Jerald S. Bradshaw、Reed M. Izatt、J. Ty Redd
DOI:10.1002/jhet.5570380604
日期:2001.11
Five novel pyridono-18-crown-6 (10-14) and two new benzyloxy-substituted pyridino-18-crown-6 (15 and 16) ligands have been prepared. By the catalytic hydrogenative removal of the benzyl group from the benzyloxy moiety at position 4 of the pyridine ring of 15 and 16, pyridono-18-crown-6 ethers 5 and 12 were obtained. These ligands were transformed to their 3,5-dibromo (10 and 13) and 3,5-dinitro derivatives
已经制备了五个新颖的吡啶并-18-冠-6(10-14)和两个新的苄氧基取代的吡啶-18-冠-6(15和16)配体。通过从15和16的吡啶环的4位上的苄氧基部分催化氢化除去苄基,获得吡啶并-18-冠-6醚5和12。通过分别用二氯甲烷中的溴和乙酸酐中的硝酸处理,将这些配体转化为它们的3,5-二溴(10和13)和3,5-二硝基衍生物(11和14)。后者的质子可电离冠醚的p K a约7.5的值10和13为4.5和11和14。因此,它们是所选阳离子的络合和质子偶联运输的良好候选者。