Highly Stereoselective Samarium(II) Iodide-Mediated Aldol Reactions of Acylaziridines with Aldehydes
作者:Yasuyuki Ogawa、Kiichi Kuroda、Teruaki Mukaiyama
DOI:10.1246/bcsj.78.1309
日期:2005.7
The samarium(II) iodide-mediated stereoselective aldol reactions of acylaziridines with aldehydes are described. β-Amino-β'-hydroxy ketones were synthesized in high yields by the aldol reaction of aldehydes with samarium enolates generated by aziridine-fragmentation of aziridinyl ketones with two moles of samarium(II) iodide. By the choice of an appropriate nitrogen protecting group, depending on the
描述了碘化钐 (II) 介导的酰基氮丙啶与醛的立体选择性羟醛反应。β-氨基-β'-羟基酮是通过醛与钐烯醇的羟醛反应以高产率合成的,钐烯醇化物是通过用两摩尔碘化钐(II)对氮丙啶基酮进行氮丙啶裂解而产生的。通过选择合适的氮保护基团,根据氮丙啶酮的 C-3 位取代基,在四种可能的非对映异构体中非对映选择性地获得抗、抗-β-氨基-无-β'-羟基酮。此外,当使用手性氮丙啶酮时,通过这种羟醛反应成功地获得了对映体纯的抗、抗-β-氨基-β'-羟基酮。此外,δ-氨基-β'-羟基-β,通过使用两摩尔碘化钐 (II) 的 γ,δ-氮丙啶基-α,β-不饱和酯的氮丙啶断裂和烯烃迁移产生的醛与烯醇钐的羟醛反应,也可以高产率合成 γ-不饱和酯. 该醛醇反应以完全的α-区域选择性进行并选择性地形成(E)-烯烃。通过在γ,δ-氮丙啶基-α,β-不饱和羰基体系中引入手性恶唑烷-2-one助剂,该反应成功地扩展到不对称反应