* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
With tetrakis(triphenylphosphine) palladium(0); potassium carbonate; In water; acetic acid; toluene;Inert atmosphere; Reflux;
(1) In a 250 mL three-necked flask, nitrogen gas is introduced.Add 0.02 mol b-1, 0.022 mol a-1 and 0.06 mol K2CO3, and add 150 ml of toluene.a mixed solution of acetic acid and water, then 0.0003 mol of tetrakis(triphenylphosphine)palladium, and stirred.Heat the reflux reaction for 10 hours, sample the plate,The reaction is complete. Natural cooling, 200ml and extracted with ethyl acetate, layers were separated, the extract was dried over anhydrous sulfate, filtered and the filtrate by rotary evaporation, purified by silica gel column to give intermediate I, HPLC purity 99.0%, yield 85.4%.