2R,3R-(+)-3-acetoxy-4′,5-dihydroxy-7-methoxyflavanone and 2R,3R-(+)-3-acetoxy-4′,5,7-trihydroxyflavanone: two new 3-acetylated dihydroflavonols from Aframomum pruinosum Gagnepain (Zingiberaceae)

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Abstract
Two new 3-acetylated dihydroflavonols, 2R,3R-(+)-3-acetoxy-4′,5-dihydroxy-7-methoxyflavanone (1) and 2R,3R-(+)-3-acetoxy-4′,5,7-trihydroxyflavanone (2), have been obtained from the seeds of Afromomum pruinosum Gagnepain, together with the known 4′,7-di-O-methylaromadendrin (5). Nerolidol (8) was also present in substantial amounts. The 13C n.m.r. resonances of these compounds have been assigned.