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Abstract 4′,5′-Dimethoxy-2′-hydroxyfurano[3″,2″:6,7]isoflavone was obtained from isoelliptol isoflavone by selective demethylation with boron tribromide. The treatment of the 2′-hydroxyisoflavone with sodium borohydride in absolute alcohol - tetrahydrofuran afforded 8,9-dimethoxyfurano[3′,2′:2,3]pterocarpan. 8,9-Dimethoxyfurano[2′,3′:3,4]pterocarpan was prepared from elliptol isoflavone by a similar procedure.
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Fukui et al. (1969) studied this question.
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