本文已经报道了正式的氮杂-迈克尔加成反应和二氯取代的卤代酰胺与N-(2-氯甲基)芳基)酰胺的[4 + 3]环化反应。以Cs 2 CO 3为碱,仅以高收率获得了相应的加成产物,如果以NaH为碱,则可以平滑地转化为正式的[4 + 3]环化产物。氮杂-迈克尔加成/分子内S N 2多米诺反应的吸引人的特征包括反应条件的温和性质和易于处理的可扩展合成。
A novel [3 + 2] cycloaddition reaction of azaoxyallyl cations and aromatic ethylenes has been developed to afford multi-substituted pyrrolidinones in moderate to good yields. This method not only further expands the synthetic utility of α-halo hydroxamates, but also provides an alternative method for the synthesis of bioactive molecules containing pyrrolidinones.
Sodium carbonate promoted [3 + 2] annulation of α-halohydroxamates and isocyanates
作者:Shaofa Sun、Rongxing Chen、Gangqiang Wang、Jian Wang
DOI:10.1039/c8ob02321b
日期:——
A new [3 + 2] annulation of readily available α-halohydroxamates and isocyanates has been developed. This protocol allows a rapid assembly of various hydantoins in good to high yields as well as a broad substrate scope and good functional group tolerance.
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
Dearomative Indole Cycloaddition Reactions of Aza-Oxyallyl Cationic Intermediates: Modular Access to Pyrroloindolines
作者:Arjun Acharya、Devendar Anumandla、Christopher S. Jeffrey
DOI:10.1021/jacs.5b10184
日期:2015.12.2
A regioselective dearomative aza-(3 + 2) cycloaddition reaction of substituted indoles with α-halohydroxamates has been developed. This transformation provides rapid access to highly functionalized pyrroloindolines that are represented in large number of bioactive compounds. The natural product, physostigmine, has been concisely synthesized utilizing this method.