Scheme 2.
Synthesis of floroglucinol derivatives 54 and 55. Reagents and conditions: NaBH4, EtOH, 0 °C, 30 min, 98%; (ii) PBr3, diethylether, 0 °C, 1 h, 85%; (iii) NaH, THF, r.t., 17 h, 26%.
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