Mild and Efficient Method for the Synthesis of Flavones by InCl3-Mediated Cyclization of 1,3-Diketones: Concise Total Synthesis of Lanceolatin B

A mild and efficient synthesis of flavones was achieved by indium(III) chloride-mediated reactions of 1,3- diketones in good yields. As an application of this methodology, total synthesis of biologically interesting lanceolatin B was carried out.