Chromone and aloin derivatives from Aloe broomii, A. Africana and A. speciosa

Four new 5-methylchromone derivatives, namely (E)-2-acetonyl-8-(2′-O-feruloyl)-β-d-glucopyranosyl-7-methoxy-5-methylchromone from A. africana, (E)-2-acetonyl-8-(2′,6′-di-O,O-coumaroyl)-β-d-glucopyranosyl-7-hydroxy-5-methylchromone from A. speciosa, (E)-2-acetonyl-8-(2′-O-caffeoyl)-β-spd-glucopyranosyl-7-methoxy-5-methylchromone and (E)-2-acetonyl-8-(2′-O-caffeoyl)-β-d-glucopyranosyl-7-methoxy-5-methyl-chromone along with 6′-O-cinnamoyl-5-hydroxyaloin A and 5-hydroxyaloin A from A. broomii, were isolated. The structures of the new compounds were determined on the basis of spectroscopic methods including ES-MS.