Direct conversion of epoxides to aziridines was achieved with guanidines as a nitrogen source. Stereochemical inversion at the chiral centers of epoxides was observed without loss of optical purity.
One-pot synthesis of aziridines from vinyl selenones and variously functionalized primary amines
作者:Silvia Sternativo、Francesca Marini、Francesca Del Verme、Antonella Calandriello、Lorenzo Testaferri、Marcello Tiecco
DOI:10.1016/j.tet.2010.06.055
日期:2010.8
Variously substituted aziridines were conveniently prepared by an aza-Michael Initiated Ring Closure (aza-MIRC) reaction starting from vinyl selenones and primary amines, aminoalcohols or diamines. The reactions proceed in very high yields at room temperature in toluene or water. A significant rate acceleration was observed under aqueous conditions.
Iron-catalyzed stereospecific [3+3]-annulation of aziridines with diaziridines is described to furnish [1,2,4]-triazines in high yield at room temperature. The use of an inexpensive iron salt catalyst, substrate scope and enantiomeric purity are the important practical features.
Al‐catalyzed stereospecific tandem C−N/C−Se bondformation of chiral aziridines with isoselenocyanates is described with 90–99% ee and 77–91% yields. The mechanistic investigation using the computational study suggests that the reaction involves a concerted pathway (SN2). The selectivity and substrate scope are the important practical features.
铝催化立体有择的串联C-N / C-硒键形成手性氮丙啶与isoselenocyanates与90-99%ee的和77-91%的产率进行说明。使用计算研究的机理研究表明,该反应涉及一致的途径(S N 2)。选择性和底物范围是重要的实用特征。