反应详情

Experimental Procedure: Triphenylphosphine (92.0 mg, 0.35 mmol) and (E)-diisopropyl diazene-1,2-dicarboxylate (DIAD, 71.0 mg, 0.35 mmol) were dissolved to a 1:1 mixture of THF and toluene (4 mL); then mono-demethylated piperlongumine (50.0 mg, 0.18 mmol) was added. After 10 min, 2-(dimethylamino) ethanol (31.0 mg, 0.35 mmol) was added to the mixture. The reaction was stirred at room temperature for 3 h. At the end, the solvent was evaporated under vacuum, and the crude product was subjected to flash chromatography (hexane/ethyl acetate=100/0 to 50:50), to afford the desired product in 90% yield.

1. customAt the end, the solvent was evaporated under vacuum