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A concise and efficient approach to the syntheses of coumestan analogues has been developed. The underpinning strategy involves a FeCl(3)-mediated direct intramolecular oxidative annellation of 4-hydroxy-3-phenyl-2H-chromen-2-one derivatives. Utilizing this synthetic protocol, a variety of coumestan derivatives were conveniently obtained from readily available reagents.
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Pang et al. (2011) studied this question.
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