A Novel Approach to Substituted 2<i>H</i>-Azirines
作者:Alan R. Katritzky、Mingyi Wang、Chavon R. Wilkerson、Hongfang Yang
DOI:10.1021/jo034472i
日期:2003.11.1
2-(Benzotriazol-1-yl)-2H-azirines 4a-c, obtained by treatment of oximes 2a-c with tosyl chloride and aqueous KOH, were reacted with benzylmagnesium bromide or 4-methylbenzylmagnesium bromide in the presence of zinc chloride to give 2-benzyl-2H-azirines 5a-f. Potassium phthalimide and sodium salt of benzenethiol converted 2-(benzotriazol-1-yl)-2H-azirines 4a-c into novel 2H-azirines 6a-c and 7 in good yields.
Copper-Catalyzed Asymmetric Addition of Tertiary Carbon Nucleophiles to 2<i>H</i>-Azirines: Access to Chiral Aziridines with Vicinal Tetrasubstituted Stereocenters
catalytic asymmetric nucleophilic addition of tertiary carbon nucleophiles to 2H-azirines was established in the presence of the chiral N,N′-dioxide/CuII complex. Various chiral aziridines with vicinaltetrasubstituted stereocenters were obtained in high yields with excellent diastereoselectivities and enantioselectivities. Moreover, on the basis of the control experiments, X-ray structures of the products
在手性N,N'-二氧化物/ Cu II配合物的存在下,将叔碳亲核试剂催化不对称亲核加成到2个H-叠氮基上。高产率地获得具有邻位四取代立体中心的各种手性氮丙啶,其具有非对映选择性和对映选择性。此外,在控制实验,产物的X射线结构和催化剂的基础上,提出了可能的过渡态来解释立体选择性。