Cascade 4+1 Radical
Annulations of 2,6-Disubstituted Phenyl Isonitriles with <i>N</i>-Propargyl-6-Iodopyridones: Scope, Mechanism
and Regioselective Synthesis of 7,9-Disubstituted Camptothecin Analogs
作者:Dennis Curran、Wu Du
DOI:10.1055/s-2003-40327
日期:——
The reaction of o,o′-dialkyl-substituted aryl isonitriles with N-propargyl-6-iodopyridones provides 11H-indolizino[1,2-b]quinolin-9-ones with significant regioselectivity in favor of the more crowded product. The usefulness of the method is illustrated with a regioselective synthesis of (20S)-7-trimethylsilyl-9-isopropyl camptothecin.
o,o'-二烷基取代的芳基异腈与 N-propargyl-6-iodopyridones 的反应提供了具有显着区域选择性的 11H-indolizino[1,2-b]quinolin-9-ones,有利于更拥挤的产物。该方法的有用性通过 (20S)-7-三甲基甲硅烷基-9-异丙基喜树碱的区域选择性合成来说明。