3 XANTHONES FROM POECILONEURON PAUCIFLORUM AND MAMMEA-ACUMINATA

From the stem of Poeciloneuron pauciflorum, two new xanthones (1,6-dih ydroxy-7-methoxyxanthone and 1,6-dihydroxy-7-methoxyxanthone 6-O-beta- D-glucoside) in addition to 12 known compounds (1,5-dihydroxy-, 1,5-di hydroxy-3-methoxy-, 1,7-dihydroxy-, 1-hydroxy-7-methoxy-, 2-methoxy-, 4-methoxy-, 1,4,5-trihydroxy-, 1,3,5-trihydroxy-, 1,3,6-trihydroxy-7-m ethoxy-, 1,3,7-trihydroxy-, 3-hydroxy-2-methoxyxanthone and (-)-epicat echin) were isolated. From the aerial parts (stems and bark) of Mammea acuminata, a new xanthone (2,7-dihydroxyxanthone) was isolated in add ition to two known xanthones (1,5-dihydroxy- and 5-hydroxy-1-methoxyxa nthone) and (-)-epicatechin. The structures were established by spectr al analysis and total synthesis in case of 1,6-dihydroxy-7-methoxyxant hone. (C) 1997 Elsevier Science Ltd.