The structure and stereochemistry of the first bi-isoflavonoid (3S, 4S)-3,4-trans-2′,7-dihydroxy-4′-methoxy-4-[(3S)-2′,7-dihydroxy-4′-methoxyisoflavan-5′-yl]isoflavan (3) from Dalbergia nitidula are established by acid-induced condensation or photolysis of the appropriate pterocarpan and isoflavan precursors.
E. V. Brandt, B. C. B. Bezuidenhoudt and D. G. Roux, J. Chem. Soc., Chem. Commun., 1982, 1409 DOI: 10.1039/C39820001409
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