Monoprenylated flavanones

Table 15.9 also presents the newly reported dihydroflavonols with prenyl, geranyl, and lavandulyl side chains (compounds 353-368), which have been mainly found in species of the family Leguminosae. For example, the root bark of Dioclea grandiflora has been the source of three new prenylated dihydroflavonols, dioclenol (353), " floranol (355), " " and paraibanol (358). Paraibanol is the 8-prenyl derivative of the dihydroflavonol diosalol (3,5,7,2, 5 -pentahydroxy-6-methoxyflavanone, 339), which was isolated from the same plant. Other newly reported prenylated dihydroflavonols from this family include the monoprenylated flavanones 356 from Rhynchosia densiflora and scariosin (357) from... 

Only two monoprenylated flavanones have so far been identified from Dorstenia species. As we have mentioned earlier 78 was obtained from the thermal reaction of 4-hydroxylonchocarpin (47). Twigs of D. poinsettifolia yielded dorspoinsettifolin (79). Cyclization of 48 in formic acid and methylation of 78 with diazomethane both readily gave 79. An isomeric compound, 6-methoxyisolonchocarpin, has been reported from Lonchocarpus subglauscescens [61]. 

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