Stereoselective photocyclization to 2-aminocyclopropanols by photolysis of β-aminoketones and oxidative ring opening to enaminones
作者:Wilfried Weigel、Sabine Schiller、Hans-Georg Henning
DOI:10.1016/s0040-4020(97)00459-6
日期:1997.6
Irradiation of β-aminopropiophenones 1 leads to the formation of 2-aminocyclopropanols 2 which can undergo oxidative ring opening to give enaminones 3. The regioselectivity of cyclopropanol formation of the α-benzyl substituted 1 is determined by the preferred charge transfer interaction between the photoexcited benzoyl chromophore and the amino group. The photocyclizations of the α- or β-substituted
辐照β-氨基丙酮1导致形成2-氨基环丙醇2,该2氨基环丙醇2可以进行氧化性开环而生成烯胺酮3。α-苄基取代的1的环丙醇形成的区域选择性取决于光激发的苯甲酰基生色团与氨基之间的优选电荷转移相互作用。α-或β-取代的1的光环化是立体选择性地进行的。没有观察到与溶剂极性无关的1m的纯对映体的光消旋作用。在C(3)-或C(2)环原子上的芳基或烷基取代基可稳定环丙醇衍生物。形成3表明可能通过激发能量的局域性将区域选择性C(1)–C(2)开环为2。