Oxidative Coupling Reactions of 1,3-Diarylpropene Derivatives to Dibenzo[a,c]cycloheptenes by PIFA
作者:Kristina Hackelöer、Gregor Schnakenburg、Siegfried R. Waldvogel
DOI:10.1002/ejoc.201100918
日期:2011.11
The oxidative cyclization reactions of a variety of α-benzyl-cinnamates can be selectively performed with hypervalent iodine as an oxidant. The dibenzo[a,c]cycloheptenes were isolated in up to 55 % yield. When an oxo substrate is applied, the yield was significantly increased. With this synthetic approach, a central intermediate for the synthesis of metasequirin-B was obtained in three steps from very
多种α-苄基-肉桂酸酯的氧化环化反应可以用高价碘作为氧化剂选择性地进行。二苯并[a,c]环庚烯以高达55%的产率分离。当使用氧代底物时,产率显着增加。使用这种合成方法,从非常简单的起始材料中分三步获得了用于合成 metasequirin-B 的中心中间体。对于这种转化,两个芳基部分都必须被激活。