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%。