Synthesis of Quinuclidines by Intramolecular Silver-Catalysed Amine Additions to Alkynes
作者:Arjen C. Breman、Andrea Ruiz-Olalla、Jan H. van Maarseveen、Steen Ingemann、Henk Hiemstra
DOI:10.1002/ejoc.201403099
日期:2014.11
for the synthesis of 2-alkylidenequinuclidines based on a silver triflate catalyzed intramol. hydroamination of 4-(prop-2-ynyl)piperidines. Monosubstituted piperidines reacted less efficiently than cis-disubstituted piperidines, and the reaction was selective for an alkyne moiety, even in the presence of a vinyl group at the 3-position. The hydroamination occurred readily with a terminal alkyne
已经开发了一种基于三氟甲磺酸银催化的内摩尔合成 2-亚烷基奎宁环的新方法。4- (prop- 2- ynyl) 哌啶的加氢胺化。单取代哌啶的反应效率低于顺式二取代哌啶,并且该反应对炔烃部分具有选择性,即使在 3-位存在乙烯基的情况下也是如此。对于末端炔烃以及带有脂肪烃的内部炔烃,很容易发生加氢胺化。或芳香。末端碳原子上的基团。使用这种银催化的环化反应,开发了一种用于继电合成金鸡纳生物碱二氢奎尼丁和二氢奎宁的简短程序。