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The structures of eupalin and eupatolin. Two new flavonol rhamnosides isolated from Eupatorium ligustrinum D.C.

1970; Elsevier BV; Volume: 26; Issue: 12 Linguagem: Inglês

10.1016/s0040-4020(01)92863-7

1464-5416

Leovigildo Quijano, Fernando Luis Malanco, Tirso Ríos,

Natural product bioactivities and synthesis

Two new flavonols, eupalitin and eupatolitin were isolated from Eupatorium ligustrinum D.C. as their rhamnosides. The structure of eupalitin (II) was established as the 3,5,4′-trihydroxy-6,7dimethoxyflavone and that for eupatolitin (IX) as 3,5,3′,4′-tetrahydroxy-6,7 dimethoxyflavone. In eupalin and eupatolin a rhamnose molecule is attached at the 3 position.