Catalytic asymmetric Povarov reaction of isatin-derived 2-azadienes with 3-vinylindoles
作者:Hong-Hao Zhang、Xiao-Xue Sun、Jing Liang、Yue-Ming Wang、Chang-Chun Zhao、Feng Shi
DOI:10.1039/c4ob01741b
日期:——
The first catalytic asymmetric Povarov reaction of isatin-derived 2-azadienes with 3-vinylindoles was established in the presence of chiral phosphoric acid, which tolerates a wide range of substrates with generally excellent diastereoselectivity and good enantioselectivity (up to >95 : 5 dr, 89 : 11 er). This approach will greatly enrich the chemistry of the catalytic asymmetric Povarov reaction, in particular ketone-involved transformations. Furthermore, this protocol represents the first diastereo- and enantio-selective construction of a spiro[indolin-3,2′-quinoline] framework bearing an indole moiety. This novel type of spiro-compound not only contains two chiral centers, including one quaternary stereogenic center, but also integrates two biologically important structures of spiro[indolin-3,2′-quinoline] and indole, which may find medicinal applications after bioassay.
首次在手性磷酸的参与下,建立了异抗坏血酸衍生的2-氮烯与3-乙烯基吲哚的催化不对称Povarov反应,该反应对广泛的底物具有良好的耐受性,通常具有优异的二立体选择性和良好的对映选择性(高达>95 : 5 dr,89 : 11 er)。这种方法将极大丰富催化不对称Povarov反应的化学,特别是酮参与的转化。此外,该方案代表了首次选择性构建带有吲哚结构的螺[吲哚-3,2′-喹啉]框架的二立体和对映选择性。这种新型螺旋化合物不仅包含两个手性中心,其中一个是四价立体中心,还整合了生物重要的两个结构,即螺[吲哚-3,2′-喹啉]和吲哚,可能在生物检测后找到药用应用。