Synthesis of 2,2-dimethylchromens

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Abstract
α,α-Dimethylpropargyl ethers of simple phenols are readily prepared in high yields. Thermal rearrangement of them affords 2,2- dimethylchromens, also in high yields. These reactions are used to prepare the natural products, ageratochromen, evodionol methyl ether, lapachenole, seselin, luvangetin, and braylin. A base-catalysed Wessely-Moser rearrangement is reported.

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