An Efficient Carbonized Sugar Catalyzed Entry to 7,8-dihydro-2HChromen- 5(6H)-ones.

The present paper describes a facile entry to various substituted 7,8-dihydro-2H-chromen-5- ones under neat conditions using simple carbonized sugar as a catalyst. The reaction was promoted by visible light under neat or in acetic acid as a solvent with a catalyst to afford the desired products in good to excellent yield. Mild conditions coupled with ease of operation make the protocol synthetically attractive and may find widespread application for the synthesis of chromenone scaffold. [ABSTRACT FROM AUTHOR]