Pd-Catalyzed Conversion of Alkynyl-λ<sup>3</sup>-iodanes to Alkenyl-λ<sup>3</sup>-iodanes via Stereoselective 1,2-Iodine(III) Shift/1,1-Hydrocarboxylation
作者:Junliang Wu、Xiaozhou Deng、Hajime Hirao、Naohiko Yoshikai
DOI:10.1021/jacs.6b06247
日期:2016.7.27
heteroatom-based nucleophiles. Herein, we report an unprecedented reaction mode of this compound class, which features a Pd(II)-assisted 1,2-I(III) shift of an alkynylbenziodoxole. A Pd(II) catalyst mediates this shift and the subsequent interception of the transient vinylidene species with carboxylic acid (1,1-hydrocarboxylation). The product of this stereoselective rearrangement-addition reaction, β-oxyalkenylbenziodoxole
炔基-λ(3)-碘烷已被确定为炔基阳离子等价物,用于碳基和杂原子基亲核试剂的炔基化。在此,我们报告了该类化合物的前所未有的反应模式,其特征是炔基苯并氧杂环戊烷的 Pd(II) 辅助 1,2-I(III) 位移。Pd(II) 催化剂介导了这种转变以及随后用羧酸(1,1-加氢羧化)拦截瞬时亚乙烯基物质。这种立体选择性重排加成反应的产物 β-氧烯基苯并氧杂环戊烷代表了一种用于进一步合成转化的新型有用的构建模块。