A sequential one-pot, simple and convenient method is described for the synthesis of 3-selenocyanato-4 H -chromen-4-ones by addition, first of DMF-DMA and then of triselenodicyanide as electrophile.
A BHT-regulated chemoselective access to monofluorinated chromones
作者:Qing-Lan Zhao、Peng-Jiu Xia、Lan Zheng、Zhen-Zhen Xie、Yuan-Zhuo Hu、Guang-Jian Chen、Xiao-Qing Chen、Hao-Yue Xiang、Hua Yang
DOI:10.1016/j.tet.2019.130833
日期:2020.2
monofluorinated chromones were efficiently assembled in a simple operational manner. Moreover, the scalability of this protocol and the versatility for the downstream transformations of the obtained fluorinated chromones to installing diverse nitrogen-containing heterocycles greatly broaden the practical applications of this developed protocol.
shelf-stable reagents for the synthesis of trifluoromethylselenylated heterocyclics remains a daunting challenge in organic synthesis. Herein, we report a green and practical protocol using trifluoromethyl tolueneselenosulfonate and ortho-hydroxyarylenaminones to access a wide range of chromone derivatives under photocatalyst and oxidant free conditions. This reaction proceeded smoothly under photoirradiation