Improved methodologies for synthesis of prenylated xanthones by microwave irradiation and combination of heterogeneous catalysis (K10 clay) with microwave irradiation
been synthesized for the first time by the microwaveirradiation method. Prenylation of the xanthone building blocks 1 and 2 with prenyl bromide in alkaline medium, using microwaveirradiation, gave the oxyprenylated xanthones 4 and 6, as major products in high yields, as well as diprenylated by-products (5, 7, 8, and 9) in very low yields. Microwaveirradiation of oxyprenylated xanthones 4 and 6 furnished