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%。
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
iodine)-induced intramolecular 7-endo-dig cyclization of 1-([1,1′-biphenyl]-2-yl)alkynones is reported. Detailed investigations on the substituenteffectsduring the electrophilic iodocyclization of the alkynones show that they play a crucial role in determining the reaction pathways of the cyclization. By modifying the substitution pattern on the alkynone substrates, the cyclization takes place regioselectively
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。
Visible Light Promoted Brominative Dearomatization of Biaryl Ynones to Spirocycles
作者:Barnali Roy、Puspendu Kuila、Debayan Sarkar
DOI:10.1021/acs.joc.3c00941
日期:2023.8.4
Oxidative Cyclization of Aryl Ynones with NaNO
<sub>2</sub>
for the Divergent Synthesis of NO
<sub>2</sub>
‐Containing Spiro[5.5]trienones, Indenones and Thioflavones
作者:Wen‐Chao Yang、Liu‐Yu Shen、Jun‐Nan Li、Jian‐Guo Feng、Pinhua Li
DOI:10.1002/adsc.202200722
日期:2022.11.8
nitration/spirocyclization of biaryl ynones using inexpensive NaNO2 as nitro source has been described. This cascade reaction is triggered by nitration of alkyne and followed by 6-exo-trig spirocyclization, dearomatization, forming the NO2-containing spiro[5.5]trienones in 63–85% yields. The present reaction also provides a practical method for the synthesis of nitrated indenones and thioflavones with 58–85% yields
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%。