Cascade <i>in Situ</i> Iodination, Chromone Annulation, and Cyanation for Site-Selective Synthesis of 2-Cyanochromones
作者:Yan Lin、Jie-Ping Wan、Yunyun Liu
DOI:10.1021/acs.joc.3c00206
日期:2023.3.17
A facile cascade reaction for the site selective synthesis of 2-cyanochromones is described. By using simple o-hydroxyphenyl enaminones and potassium ferrocyanide trihydrate (K4[Fe(CN)6]3·3H2O) as starting materials and I2/AlCl3 as promoters, the products are furnished via tandem chromone ring formation and C–H cyanation. The in situ formation of 3-iodochromone and a formal 1,2-hydrogen atom transfer