The first 9-hydroxyhomoisoflavanone, and antiplasmodial chalcones, from the aerial exudates of Polygonum senegalense

Issue in Honor of Prof. Berhanu Abegaz ARKIVOC 2007 (ix) 21-27 O OOH OHMeO OH R3R2 R1 2 45 8 9 8a 4a 1' 4' A C B OH O 1 R3R2 R1 2 R1 = R3 = OMe, R2 = OH 3 R1 = H, R2 = R3 = OMe 4 R1 = H, R2 = OH, R3 = OMe 5 R1 = R2, OMe, R3 = OH OH O 6 R1 = H, R2 = OMe, R3 = OH 7 R1 = R2= OMe, R3 = OH MeO O OOH 8 Figure 1. Structure of polygohomoisoflavanone (1) and other compounds isolated from Polygonum senegalense. O OOH OHMeO O H O H O OOH OHMeO H + +. +. 1 m/z 210 m/z 316 Scheme 1. McLafferty rearrangement in 1. ISSN 1424-6376 Page 24 ©ARKAT USA, Inc.