Brosimopsis oblongifolia

A series of isoprenylated flavonoids has been isolated from the following moraceous plants Brosimopsis oblongifolia, a Brazilian plant [36], Chinese Cudrania tricuspidata [37], and Taiwanese and Chinese Cudrania cochinchinensis [38]. Many xanthones with one or two isoprenoid groups have also been isolated from these Cudrania species... 

The compounds structurally similar to the mulberry Diels-Alder type adduct have also been isolated from the other species of the plants of the family Moraceae. Brosimones A (26) [41], B (27) [14] and D (28) [14] have been isolated from Brosimopsis oblongifolia, a Brazilian moraceous plant (Figure 7). They are expected to be formed through the same way as the mulberry Diels-Alder type adducts. Of these compounds, compound (26) is a unique adduct which may be formed through an intramolecular [4+2] cycloaddition reaction of the isoprenyl portion and the a, -double bond of the chalcone slceleton of compound (28) (Figure 8). Artonins C (29) [42], D (30) [42] and I (31) [43] isolated from Artocarpus heterophyllus, an Indonesian moraceous plant, can also be regarded... 

Figure 7 optically active Diels-Alder type adducts from Brosimopsis oblongifolia... 

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