Synthesis of Benzo[c]xanthones from 2-Benzylidene-1-tetralones by the Ultraviolet Radiation-Mediated Tandem Reaction.

[摘要]：A facile one-pot method to prep. benzo[c]xanthones, e.g., I (R1 = H, Br; R2 = H, MeO; R3 =H, Me, t-Bu, Br), from readily accessible benzylidene-1-tetralones by the UV radiation-mediated tandem reaction is reported. The overall transformation presumably involves cis-trans isomerization, oxa-6p electrocyclization, singlet oxygen ene reaction, dehydration, and aromatization.

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