A Novel Short-Step Synthesis of New Xanthenedione Derivatives from the Cyclization of 3-Cinnamoyl-2-styrylchromones
作者:Artur Silva、Diana Pinto、Ana Seca、Stéphanie Leal、José Cavaleiro
DOI:10.1055/s-0030-1261172
日期:2011.9
Novel (E)-3-aryl-4-benzylidene-8-hydroxy-3,4-dihydro-1H-xanthene-1,9(2H)-diones are prepared by the cyclization of (E,E)-3-cinnamoyl-5-hydroxy-2-styrylchromones efficiently catalyzed with boron tribromide. The (E,E)-3-cinnamoyl-5-hydroxy-2-styrylchromones are obtained from the Baker-Venkataraman rearrangement of (E,E)-2-acetyl-1,3-phenylene bis(3-phenylacrylate), which is greatly improved under microwave irradiation.
新型(E)-3-芳基-4-亚苄基-8-羟基-3,4-二氢-1H-氧杂蒽-1,9(2H)-二酮是由(E,E)-3-肉桂酰基-5-羟基-2-苯乙烯基色酮在三溴化硼的高效催化下环化制备的。(E,E)-3-肉桂酰基-5-羟基-2-苯乙烯基色酮是由(E,E)-2-乙酰基-1,3-亚苯基双(3-苯基丙烯酸酯)的贝克-文卡塔拉曼重排反应得到的,该反应在微波辐照下得到极大改善。