Polyphosphoric Acid Promoted Synthesis of 10,11-Dihydrobenzo[j]fluoranthen-12-one

[摘要]：A straightforward synthesis of 3,8-dimethoxy-10,11-dihydrobenzo[j]fluoranthen-12-ones 1 Is reported In a seven-step route from blpheny1-4,4'-diol 2 via the transformation of a double Clalsen rearrangement, cross metathesis with ethyl acrylate, and polyphosphoric acid (PPA)-promoted Friedel-Crafts electrophilic benzannulatIon In good yields.

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