Highly diastereoselective Claisen rearrangement leading to vicinal quaternary carbons construction of oxindoles
作者:Yumiko Matsuta、Takayuki Kobari、Sachiko Kurashima、Yuhsuke Kumakura、Masashi Shinada、Kazuhiro Higuchi、Tomomi Kawasaki
DOI:10.1016/j.tetlet.2011.09.059
日期:2011.11
oxindole architecture with vicinal quaternary carbon centers is described. The reaction of 2-allyloxyindolin-3-ones with cyanomethylphosphonate at low reaction temperature proceeds smoothly with consecutive olefination, isomerization, deacylation, and anion-accelerated Claisen rearrangement to give the 3,3-disubstituted oxindoles with vicinal quaternary all-carbon centers in high yield and diastereoselectivity
描述了一种具有邻位季碳中心的螺环羟吲哚结构的有效方法。2-烯丙氧基吲哚-3-酮与氰基甲基膦酸酯在低反应温度下的反应顺利进行,并进行连续的烯化,异构化,脱酰基和阴离子加速的克莱森重排,从而得到具有较高邻位季铵全碳中心的3,3-二取代的吲哚。产率和非对映选择性。羟吲哚很容易转化为合成度更高的螺产物。