Alkylated benzoquinone derivatives from Maesa lanceolata

Five new alkylated benzoquinones were isolated as methyl ether derivatives From a complex mixture containing alkylated hydroxy benzoquinones, obtained from the fruits of;Maesa lanceolata. The structures of the benzoquinones. named. 2-acetoxy-5-methoxy-6-methyl-3-tridecyl-1, 4-benzoquinone. 2-methoxy -5-acetoxy-6-methyl-3-tridecyl-1, 4-benzoquinone. 2-acetoxy-5-methoxy-6-met hyl-3-[(z)-10'-pentadecenyl]-1.4-benzoquinone. 2-methoxy-5-acetoxy-6-methyl -3-[(z)-10'-pentadecenyl-1. 4-benzoquinone and 1.5-dimethoxy-6-methyl-3-tri decyl-1.4-benzoquinone]. were based on H-1 and C-13 NMR data. mainly 2D NMR experiments. including H-1-C-13 HMBC correlations, as well as chemical der ivatization. (C) 1999 Elsevier Science Ltd. All rights reserved.