An Enolate‐Structure‐Enabled Anionic Cascade Cyclization Reaction: Easy Access to Complex Scaffolds with Contiguous Six‐, Five‐, and Four‐Membered Rings
AbstractCatalyst‐free addition of ketone enolate to non‐activated multiple C−C bonds involves non‐complementary reaction partners and typically requires super‐basic conditions. On the other hand, highly aggregated or solvated enolates are not reactive enough to undergo direct addition to alkenes or alkynes. Herein, we report a new anionic cascade reaction for one‐step assembly of intriguing molecular scaffolds
Propargyl Chalcones’ Radical Annulation/Sulfonation Reaction: Efficient Synthesis of Benzo[<i>b</i>]oxepin-5(2<i>H</i>)-one and Chromane Derivatives
作者:Qiuyu Yu、Jinghang Zhang、Fan Wu、Xiaoqin Liu、Chang Wang、Jinpeng Zhang、Liangce Rong
DOI:10.1021/acs.joc.2c00361
日期:2022.6.3
A novel and facile methodology for the synthesis of sulfonated benzo[b]oxepinone and chromane derivatives was reported by the reaction of propargyl chalcones with arylsulfonyl chloride via radical cascadeannulation/sulfonation under laboratory conditions. Readily available propargyl chalcones, commercialized arylsulfonyl chloride, and simple reactionconditions make this six(seven)-membered oxygen-containing
在实验室条件下,炔丙基查耳酮与芳基磺酰氯通过自由基级联环化/磺化反应,报道了一种用于合成磺化苯并[ b ]氧杂萜酮和色烷衍生物的新型简便方法。易得的炔丙基查尔酮、商品化的芳基磺酰氯和简单的反应条件使这种六(七)元含氧杂环的合成策略更具吸引力并具有重要的应用价值。
A practical metal-free and additive-free approach for the synthesis of 6/7/8-membered oxacyclic ketone-fused isoxazoles/isoxazolines tetracyclic or tricyclic structures is reported through Csp3–H bond radical nitrile oxidation and the intramolecular cycloaddition of alkenyl/alkynyl-substituted aryl methyl ketones. This convenient approach enables the simultaneous formation of isoxazole/isoxazoline