The fluoride ion-induced intramolecular conjugate addition of propargylsilanes to dihydropyridones. A novel method for the stereoselective construction of azabicyclic ring systems
作者:Magdalena Dziedzic、Grzegorz Lipner、José M. Illangua、Bartłomiej Furman
DOI:10.1016/j.tet.2005.06.105
日期:2005.9
The fluoride ion-induced intramolecular conjugate addition of propargylsilanes to dihydropyridones is reported. Our results revealed that tetrabutylammonium triphenyldifluorosilicate (TBAT), an air-stable, non-hygroscopic fluoride ion source, catalyzes cyclocondensation to provide the corresponding 1-vinylidene indolizidines in a high yield as single isomers, while Lewis acid catalysts were ineffective
据报道,氟离子诱导的炔丙基硅烷分子内共轭加成到二氢吡啶酮中。我们的结果表明,空气稳定的,非吸湿性的氟离子源四丁基三苯基二氟硅酸铵(TBAT)催化环化缩合反应以高产率提供相应的1-亚乙烯基吲哚并咪唑作为单一异构体,而路易斯酸催化剂无效。在产生具有更大环尺寸的化合物的反应中进一步研究了该方法的范围。在这些情况下,具有位于侧链的炔丙基硅烷的二氢吡啶酮进行环化,从而以显着较低的产率得到9-亚乙烯基喹嗪。