Addition reactions to chiral aziridine-2-carboxaldimine toward various enantiopure nitrogen-containing heterocycles
作者:Heui-Yoon Noh、Sang-Woo Kim、Seong In Paek、Hyun-Joon Ha、Hoseop Yun、Won Koo Lee
DOI:10.1016/j.tet.2005.07.064
日期:2005.9
Chiral (2R,1'R)-(1'-phenylethyl)aziridine-2-carboxaldimine was utilized as a nitrogen-containing starting substrate for the preparation of various enantiopure nitrogen-containing heterocycles. The additions of nucleophiles including organomagnesium reagents, cyanotrimethyl si lane and ketene acetal to the chiral (2R,1'R)-(1'-phenylethyl)aziridine-2-carboxaldimine proceeded in highly stereoselective manner via chelation controlled transition states. Subsequent treatment of adducts with triphosgene and NaH yielded 5-substituted-4-chloromethylimidazolidin-2-ones. This imine was also served as either aza-diene or aza-dienophile with olefin or diene to provide hetero-Diels-Alder adducts 2-aziridinylpiperidines or 1,2,3,4-tetrahydroquinolines. (c) 2005 Elsevier Ltd. All rights reserved.