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%。
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。
<i>ipso</i>-Cyclization of unactivated biaryl ynones leading to thio-functionalized spirocyclic enones
作者:Chada Raji Reddy、Uprety Ajaykumar、Amol D. Patil、Remya Ramesh
DOI:10.1039/d3ob00974b
日期:——
Ceric ammonium nitrate (CAN)-promoted oxidative ipso-cyclization of unactivated biaryl ynones with S-centered radicals (SCN/SCF3) to access spiro[5,5]trienones has been established. This approach displayed excellent regioselectivity towards spirocyclization and tolerated a variety of functional groups. Dearomatization of hitherto unknown aryl/heteroaryl groups is also disclosed. DMSO is employed as