Catalytic C–H/N–H cross-coupling is considered an ideal strategy for accessing anilines and their derivatives, but its synthetic execution remains extremely challenging, especially when the exclusion of external oxidants is desired. Reported herein is a photoelectrocatalytic method for the preparation of anilides through the C–H/N–H coupling of arenes and carbamates, which employs DDQ as a molecular
Herein, we present an operationally simple protocol for the cycloisomerization of propargylic carbamates in which a heterogeneous catalyst consisting of Pd species immobilized on amino‐functionalized siliceous mesocellular foam (PdII‐AmP‐MCF) is used. This Pd nanocatalyst displayed high efficiency at low catalyst loading and reaction temperatures, which allowed for the efficient and mild synthesis
在此,我们提出了一种炔丙基氨基甲酸酯环异构化的操作简单协议,其中使用了由固定在氨基官能化硅质介孔泡沫(Pd II -AmP-MCF)上的Pd组成的非均相催化剂。这种Pd纳米催化剂在较低的催化剂负载量和反应温度下显示出高效率,从而可以高效,温和地合成各种1,3-恶唑烷酮-2-酮衍生物和相关化合物。此外,尽管在随后的循环中观察到活性逐渐下降,但事实证明,可以将Pd纳米催化剂再用于一些反应。
Regioselective 1,3-Dipolar Cycloaddition Reactions of 4-Methylene-2-oxazolidinones with Benzonitrile Oxide
作者:Rebecca Newton、G. Paul Savage
DOI:10.1071/ch08111
日期:——
two steps by cyclizing O-propargyl carbamates, which in turn were prepared from propargyl alcohols and phenyl isocyanate. The 4-methylene-2-oxazolidinones underwent a 1,3-dipolar cycloaddition reaction with benzonitrileoxide to give the corresponding spiro heterocycles. Where the substitution pattern on the oxazolidinone engendered facial asymmetry, the cycloadditon reaction proceeded with 5:1 selectivity