Base-Promoted Cycloaddition of γ-Hydroxy- and δ-Hydroxy-α,β-Unsaturated Carbonyls with Azaoxyallyl Cations: Rapid Synthesis of <i>N,O</i>
-Heterocycles
作者:Eun Chae Son、Jiseon Lee、Sung-Gon Kim
DOI:10.1002/ejoc.202000368
日期:2020.5.29
The synthesis of morpholin‐3‐one and 1,4‐oxazepan‐3‐one skeletons was achieved by the cycloaddition reaction of alcohol‐tethered enones and α‐halohydroxamates. This process proceeds through the addition of the hydroxyl group in the enone to an in‐situ generated azaoxyallyl cation followed by intramolecular aza‐Michael‐type trapping. Morpholin‐3‐ones and 1,4‐oxazepan‐3‐ones could be generated from γ‐hydroxy
Electrophilic Thiocyanato Reagent Assisted Oxa-Michael/Thiocyanation of α,β-Unsaturated Ketones
作者:Zhenda Fu、Yong Gao、Hongquan Yin、Fu-Xue Chen
DOI:10.1021/acs.joc.1c01993
日期:2021.12.3
of the electron-deficient C═C double bond was developed. Regioselective thiocyanation-etherification of α,β-unsaturated ketones was achieved. The desired products were obtained in moderate to high yields under mild conditions. It was suggested that the nucleophile was activated by the electrophilic thiocyanato reagent, and difunctionalization was achieved through a 1,4-addition/thiocyanation pathway