Regioselective 1,2-additions of alcohols to allenamides mediated by N-Iodosuccinimide: Synthesis of N,O-aminals
作者:Xiao Yuan、Xi Jia Ai Ti Re He Man、Xiao-Xiao Li、Zhi-Gang Zhao
DOI:10.1016/j.tet.2018.07.045
日期:2018.9
N-iodosuccinimide-mediated regioselective 1,2-additions of alcohols to allenamides. These novel reactions proceed rapidly and exhibit broad substrate scope for a variety of allenamides. The reaction demonstrates that N-Iodosuccinimide is effective in activating the terminal CC bond of allenamides generating conjugated sulfamide ion species. It is noteworthy that the alcohol served as both solvent and nucleophile in
Enantioselective Synthesis of <i>trans</i>
-Vicinal Diamines <i>via</i>
Rhodium-Catalyzed [2+2] Cycloaddition of Allenamides
作者:Wei-Feng Zheng、Gui-Jun Sun、Liang Chen、Qiang Kang
DOI:10.1002/adsc.201800021
日期:2018.5.2
An efficient protocol for the enantioselective Rh‐catalyzed intermolecular head‐to‐head [2+2] cycloaddition of allenamides was developed. A variety of enantio‐enriched cyclobutane‐1,2‐diamine derivatives were achieved in good yields with good to excellent enantioselectivities.
NIS-Mediated intermolecular hydroamination of allenamides with imidazole heterocycles: a facile protocol for the synthesis of allylic <i>N</i>,<i>N</i>-acetals
作者:Yan Li、Guo Li Luo、Xiao Xiao Li、Zhi Gang Zhao
DOI:10.1039/c8nj03641a
日期:——
conjugated sulfimide ion species that undergoes nucleophilic attack by imidazole to form the 1,2-adduct. Mixtures of N1- and N3-substituted isomers were obtained using asymmetrically substituted imidazoles. However, the 1,4-adduct was obtained using a tri-substituted imidazole. The efficiency of the gram-scale reaction suggests the potential industrial application of this synthetic method.