Ga(OTf)3-mediated synthesis of substituted benzofurans
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Add time:07/12/2019 Source:sciencedirect.com
A synthetic procedure, for the synthesis of a series of functionalized benzofurans 3–5 and benzonaphthofurans 6, starting from intermolecular O-alkylation of α-bromoaryl ketones 2 with potassium oxygenated phenoxides 1 followed by Ga(OTf)3-catalyzed direct intramolecular cyclodehydration of the resulting α-aryloxyaryl ketones, has been developed. The use of various metal triflates was investigated for a facile approach and efficient transformation. Pentacyclic benzophenanthrofurans 7 were prepared via photolytic annulations of 5.
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