Coinage Metals-Catalyzed Cascade Reactions of Aryl Alkynylaziridines: Silver(I)-Single vs Gold(I)-Double Cyclizations
作者:Nicolas Kern、Aurélien Blanc、Solène Miaskiewicz、Michelle Robinette、Jean-Marc Weibel、Patrick Pale
DOI:10.1021/jo300294r
日期:2012.5.4
Alkynylaziridines carrying an aryl group could be efficiently converted into aminoallenylidene isochromans, isoquinolines, or tetrahydronaphtalenes with silver(I) salts and into 1-azaspiro[4.5]decane derivatives with gold(I) complexes. Mechanistic investigations revealed that both Ag- and Au-catalyzed reactions involved a Friedel–Crafts type intramolecular reaction leading to an allene and that Au
带有芳基的炔基氮丙啶可以有效地转化为具有银(I)盐的氨基亚烯基异色烷,异喹啉或四氢萘,并转化为具有金(I)络合物的1-azaspiro [4.5]癸烷衍生物。机理研究表明,Ag和Au催化的反应均涉及Friedel-Crafts型分子内反应,从而导致烯丙二烯,而Au也迅速促进了氨基丙二烯中间体向相应螺环衍生物的第二次分子内环化。立体化学研究表明抗-SN 2第一次环化的“-”型途径导致形成立体定义的烯丙基,然后可以将其环化为相应的立体定义的螺环产物。这些结果突出了Ag和Au的亲氧性或亲氮性和亲核性之间的对偶性,以及它们在反应性方面的互补性。