95.4% |
With ammonium cerium (IV) nitrate; bis(tricyclohexylphosphine)nickel(II) dichloride; 2,2-bis(hydroxymethyl)propionic acid; strontium nitrate; cadmium(II) acetate; In ethylene glycol; at 70℃; for 8h;Inert atmosphere; |
Under room temperature, the nitrogen atmosphere, to the proper amount of organic solvent glycol, by adding 100mmol compounds represented by the following general formula (I) compound, 150mmol aboving (II) compound, 12mmol catalyst NiCl 2 (PCy 3) 2, 200mmol oxidant ammonium ceric nitrate, 175mmol alkali DMPA and 15mmol promoter (for 3mmol cadmium acetate and 12mmol strontium nitrate of mixture), then heating to 70 °C, and at this temperature the stirring reaction 8 hours; After the reaction, the reaction solution is filtered, adjusted to neutral pH value of the filtrate, saturated salt water is then used to fully wash, then adding ethyl acetate extraction 2-3 time, combined with the phase, drying anhydrous sodium sulfate, concentrated under reduced pressure, the resulting residue over silica gel column chromatography, so as to the acetone and volume ratio of the mixed solution of petroleum ether eluviation, so as to obtain the compound of formula (III), the yield is 95.4percent. |