The reaction of phenyliodine bis(trifluoroacetate) (PIFA) with a series of anilides 1 (E = CO2Et) In CF3CH2OH was found to give 3-hydroxy-2-oxindole derivatives 2, while that with various anilides 1' (E = CON(R-4)Ar) afforded the C-2-symmetric or unsymmetric spirooxindoles 3. These processes feature a metal-free oxidative C(sp(2))-C(sp(3)) bond formation, followed by oxidative hydroxylation or spirocyclization.
Asymmetric Organocatalytic Direct C(sp<sup>2</sup>)H/C(sp<sup>3</sup>)H Oxidative Cross-Coupling by Chiral Iodine Reagents
作者:Hua Wu、Yu-Ping He、Lue Xu、Dong-Yang Zhang、Liu-Zhu Gong
DOI:10.1002/anie.201309967
日期:2014.3.24
An asymmetric organocatalytic direct CH/CHoxidativecoupling reaction of N1,N3‐diphenylmalonamides has been well established by using chiral organoiodine compounds as catalysts, wherein four CH bonds were stereoselectively functionalized to give structurally diverse spirooxindoles with high levels of enantioselectivity. More importantly, the findings indicated that chiral hypervalent organoiodine
不对称的有机催化直接Ç H / C ħ氧化偶联反应Ñ 1,Ñ 3 -diphenylmalonamides已经很好地利用建立手性有机碘化合物作为催化剂,其特征在于,四号丙 H键被立体选择性地官能化以得到具有高结构多样spirooxindoles对映选择性水平。更重要的是,这些发现表明,手性高价有机碘试剂可作为替代催化剂,用于创建无活性CH键的对映选择性官能化。