Base-Promoted Formal [4 + 3] Annulation between 2<i>-</i>Fluorophenylacetylenes and Ketones: A Route to Benzoxepines
作者:Lu Ouyang、Chaorong Qi、Haitao He、Youbin Peng、Wenfang Xiong、Yanwei Ren、Huanfeng Jiang
DOI:10.1021/acs.joc.5b02487
日期:2016.2.5
The first base-promoted formal [4 + 3] annulation between 2-fluorophenylacetylenes and ketones has been disclosed. The reaction proceeds through a tandem α-vinylation of ketones followed by an intramolecular nucleophilic aromatic substitution (SNAr) reaction of the in situ generated β,γ-unsaturated ketone intermediates, providing a straightforward access to a wide range of functionalized benzoxepines
已经公开了在2-氟苯基乙炔和酮之间的第一个碱促进的正式[4 + 3]环。通过酮的串联α-乙烯化反应的进行,随后通过分子内的亲核芳族取代(S Ñ所述的AR)反应原位产生的β,γ不饱和酮的中间体,提供在温和的直接访问广泛官能benzoxepines的高产。不含过渡金属的方法具有广泛的底物范围,使用易于获得的起始原料以及较高的官能团耐受性。