Synthesis of 6- and 7-alkoxy-4-methylcoumarins from corresponding hydroxy coumarins and their conversion into 6- and 7-alkoxy-4-formylcoumarin derivatives
作者:Vu Ngoc Toan、Nguyen Dinh Thanh
DOI:10.1080/00397911.2020.1807571
日期:2020.12.1
Abstract Hydroxy derivatives of 4-methyl-2H-chromen-2-one were prepared from hydroquinone and resorcinol through their reaction with ethyl acetoacetate. These hydroxy coumarins were then converted into corresponding alkoxy derivatives by reaction with alkyl halides. The yields of 6- and 7-alkoxy-4-methylcoumarins 3a–i and 4a–i were 55−95%. Oxidation of these compounds by selenium dioxide under conventional