Expect the upexpected: A transition-metal-free approach to access chromone derivatives has been developed. The intramolecular O-arylation of substituted 1-(2-haloaryl)-propane-1,3-diones in DMF in the presence of K2CO3 gave the corresponding target products in good to excellent yields (see scheme; DMF=N,N′-dimethylformamide).
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Zhao et al. (2011) studied this question.
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