A simple approach to highly functionalized benzo[b]furans from phenols and aryl iodides via aryl propargyl ethers
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Add time:08/30/2019 Source:sciencedirect.com
A variety of mono- and disubstituted phenols are alkylated with propargyl bromide to give phenyl 2-propynyl ethers, which were further coupled with aryl iodides under Sonogashira reaction conditions to give 3-phenoxy-1-aryl-1-propyne derivatives. The latter compounds underwent an initial Claisen rearrangement followed by ring closure to give functionalized benzo[b]furans in moderate to good yields.
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