8-Hydroxyflavonoid glucuronides of <Emphasis Type="Italic">Malope trifida</Emphasis>

The new flavonoid: herbacetin 3-O-β-glucopyranoside-8-O-β-glucuronopyranoside (1) together with known gossypetin 3-O-β-glucopyranoside - 8-O-β-glucuronopyranoside (2) and isoscutellarein: 8-O-β-glucuronopyranoside (3) as well as 4′-methyl ether-8-O-β-glucuronopyranoside (4), were isolated from the calyx and epicalyx leaves of Malope trifida and identified on the basis of their spectroscopic properties: UV, ¹H and ¹³C NMR, ESI/MS. Two other flavonoids were identified as isoscutellarein: 3′-hydroxy 4′-methyl ether-8-O-β-glucuronoside (5) and 8-O- rhamnoglucoside (6) on the basis of their UV and ESI/MS data.     

Novel Synthesis of 3-Hydroxy-β-damascone, 3-Hydroxydihydro-β-damascone and β-damascenone

Naturally occurring damascone analogues, 3-hydroxy-β-damascone, 3-hydroxydihydro-β-damascone and β-damascenone, which are known as key substances for the flavor of rose oil and tobacco, were synthesized via Diels-Alder reaction of the reactive diene, l-methoxy-3-trimethylsilyloxy-butadiene.