Synthesis of 1,2-Diacyloxy-1,2-difuryl(2)-ethylene under Microwave Irradiation

The target products were synthesized in the presence of pyridine and triethylamine as catalysts under traditional calefaction and microwave irradiation.With pyridine as catalyst,the yield was raised from 61.6%(under traditional calefaction) to 81.6%(under microwave irradiation),and the reaction time was decreased to 1/100 times.With triethylamine as catalyst,the yields raised from 75.2%(under traditional calefaction) to 94.4%(under microwave irradiation),and the reaction time was decreased to 1/15 times.By characterization with elementary analysis,MS and 1HNMR,the structural formula of 5 target products were distinctively demonstrated.Their max.UV absorbance were near 315 nm.The experimental results show the best synthesis conditions:furoin 20 mmol,n(furoin)∶n(acid chloride)=1∶2.2,triethylanine 25 mL,power of microwave 240 W and radiation time 10 min.Yields of the products were over 94%.