The total synthesis of biologically active pyranoflavone natural products 1 and 2 was carried out starting from 2H-pyran. The synthesis of pyranochalcone natural products, lonchocarpin (9) and 4-hydroxylonchocarpin (10), and their derivatives 30-32 is described. This synthetic route also provides biologically interesting materials such as β-tubaic acid (24), desmethyl isoencecalin (25), and isoencecalin (27).
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Lee et al. (2006) studied this question.
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