已经描述了使用廉价的 NaNO 2作为硝基源的AK 2 S 2 O 8促进联芳基炔酮的硝化/螺环化。该级联反应由炔烃的硝化引发,然后进行 6-exo-trig 螺环化、脱芳构化,形成含 NO 2的螺[5.5]三烯酮,产率为 63-85%。本反应还提供了一种合成硝化茚酮和硫代黄酮的实用方法,收率可达 58-85%。
Iron-Catalyzed Dearomatization of Biaryl Ynones with Aldehydes via Double C–H Functionalization in Eco-Benign Solvents: Highly Atom-Economical Synthesis of Acylated Spiro[5.5]trienones
作者:Dong Xia、Xin-Fang Duan
DOI:10.1021/acs.joc.1c01870
日期:2021.11.5
bonds of biaryl ynones render the 6-exo-trig regioselective C–H activation dearomatization to spiro[5.5]trienones challenging since the competing reactions of C–H bonds on Ar1 or the ortho-C–H bonds on Ar3 may result in 5-exo-trig cyclization to indenones or 6-exo-trig ortho-dearomatization, respectively. We here report an unprecendented dearomatization of biaryl ynones with aldehydes via double C–H
Metal-Free, Site-Selective Addition to Ynones: An Approach to Synthesize Substituted Quinoline Derivatives
作者:Zi-Sheng Chen、Fang Yang、Huibo Ling、Mengxue Li、Jin-Ming Gao、Kegong Ji
DOI:10.1021/acs.orglett.6b02813
日期:2016.11.18
An efficient two component cycloaddition reaction to synthesize various substitutedquinoline derivatives was developed. Ynone 1 was functionalizated by N-oxide attacking the C3-oxetium site and C3-site regioselectively to give 3 and 4. Analogues 3k and 4v have a high binding constant with Hg2+ in CH3CN.
An efficient strategy to construct salicyl ketones through gold‐catalyzed oxidation/C−H functionalization of ynones is reported. A variety of functionalized salicyl ketones are readily accessed by utilizing this non‐diazo approach, thus providing a viable alternative to synthetically useful salicyl ketones with a yield up to 98 %. The α‐oxo gold carbenes generated in situ through gold‐catalyzed oxidation
Trifluoromethylthiolative spirocyclization of biaryl ynones without leaving groups on the <i>para</i>-position of dearomatized aryl rings
作者:You Liang、Sijin Wang、Huijuan Jia、Beibei Chen、Feng Zhu、Zhongyang Huo
DOI:10.1039/d2nj01056a
日期:——
efficient strategy for the oxidative spirocyclization of biaryl ynones has been developed, where nonsubstituted groups were on the para-position of the dearomatized aryl rings. This cascade reaction uses the stable and readily available AgSCF3 as a trifluoromethylthio radical precursor and the reaction occurs smoothly in the presence of K2S2O8 and TBHP via a 6-exo-trig radical cyclization, providing a variety
已经开发了一种直接有效的联芳基炔酮氧化螺环化策略,其中未取代的基团位于脱芳基芳环的对位。该级联反应使用稳定且易于获得的 AgSCF 3作为三氟甲硫基自由基前体,在 K 2 S 2 O 8和 TBHP存在下通过6 - exo -trig 自由基环化反应顺利进行,提供多种 SCF 3 -含有高产率的螺[5,5]三烯酮。