Efficient synthesis of 9,10-dihydropyrano[2,3-<i>h</i>]chromene-2,8-dione derivatives in ionic liquid and the study of their antioxidant activity
作者:Zahra Lasemi、Razieh Azimi、Mohammadreza Azizi Amiri
DOI:10.1080/14786419.2016.1166493
日期:2017.1.2
Ionic liquid N,N,N′,N′-tetramethylguanidinium trifluoroacetate (TMGT) has been applied as a green and reusable catalyst for the one-pot synthesis of 10-aryl substituted-9,10-dihydropyrano[2,3-h]chromene-2,8-diones via reaction of various aromatic aldehydes, 5,7-dihydroxycoumarin derivatives and Meldrum’s acid. The reactions were rapid, clean and the products were prepared in good yield. The ionic liquid
离子液体N,N,N',N'-四甲基胍三氟乙酸盐(TMGT)已用作绿色和可重复使用的催化剂,用于一锅合成10-芳基取代的9,10-二氢吡喃[2,3- h ]通过各种芳族醛,5,7-二羟基香豆素衍生物和Meldrum酸的反应生成chromene-2,8-diones。反应迅速,干净,并且以高收率制备了产物。离子液体在反应过程中是稳定的,可以重复使用而不会显着降低其活性。通过1,1-二苯基-2-吡啶并肼基(DPPH)自由基清除测定法评估合成的化合物的抗氧化活性。