Aluminum(III)-promoted Prins cyclization of 2-allylphenols: an expedient synthesis of benzoxepins.

[摘要]：2-Allylphenols undergo smooth cross coupling with ketones under mild conditions to produce spirocyclic oxepins in good yields with high chemoselectivity, whereas arom. aldehydes provide benzoxepins with moderate stereoselectivity. The use of aluminum(III) chloride makes this method simple, convenient, and cost effective.

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