The Cp2ZrCl2-catalyzed cycloalumination of acetylenic alcohols and propargylamines by Et3Al was studied. The process affords 2,3-disubstituted alumacyclopent-2-enes, which were identified by the analysis of the products of their deuterolysis and hydrolysis. The cycloalumination of alkyl- and phenyl-substituted propargylamines proceeds with high regio- and stereoselectivity to give the corresponding allylamine derivatives in high yield. Unlike the phenyl derivatives, the cycloalumination of alkyl-substituted acetylenic alcohols (propargyl, homopropargyl, and bishomopropargyl alcohols) is not regioselective.
研究了Cp2ZrCl2催化的
乙炔醇和
炔丙胺与Et3Al的环铝化反应。该过程生成2,3-二取代的铝杂环戊-2-烯,通过对其
氘解和
水解产物的分析鉴定了这些产物。烷基和苯基取代的
炔丙胺的环铝化反应具有高度的区域选择性和立体选择性,以高产率得到相应的
烯丙胺衍
生物。与苯基衍
生物不同,烷基取代的
乙炔醇(炔
丙醇、高炔
丙醇和双高炔
丙醇)的环铝化反应不具有区域选择性。