PHLOROGLUCINOL DERIVATIVES FROM LEAVES OF BOSISTOA-PENTACOCCA

Leaves from four collections of Bosistoa pentacocca, two of the variet y connaricarpa and one each of the type variety and var. dryanderensis , have been examined. In each, the major metabolite isolated was chara cterized as yl)-6-(3-methylbut-2-enyl)phloroglucinol-1-acetate (trivia l name pentacoccol). Four other pentacoccol derivatives were obtained as minor components, pentacoccol-5-methyl ether (from var. pentacocca and var. dryanderensis), 2,2-dimethyl-3 imethyloct-2,5-dienyl)-3,4-dih ydrobenzo-[2H]-pyran (3'-hydroxydihydropyranopentacoccol from var. con naricarpa), -dimethyloct-2,5-dienyl)-6-hydroxybenzo-[2H]-furan (2'-(1- hydroxyosopropyl)furanopentacoccol from var. pentacocca) and -dimethyl oct-2,5-dienyl)-6-hydroxybenzo-[2H]-furan (furanopentacoccol from var. dryanderensis). All compounds were identified on the basis of their s pectroscopic data. (C) 1997 Elsevier Science Ltd. All rights reserved.