作者:Clementina M. M. Santos、Artur M. S. Silva、José A. S. Cavaleiro
DOI:10.1002/ejoc.200300468
日期:2003.12
Hydroxy-2-styrylchromones 5a−i were prepared by debenzylation of benzyloxy-2-styrylchromones 3a−i, which were synthesised by the Baker−Venkataraman method. The last step of this method, the cyclodehydration 5-aryl-3-hydroxy-1-(2-hydroxyaryl)-2,4-pentadien-1-ones 2a−i, was carried out with a catalytic amount of iodine, or p-toluenesulfonic acid, in DMSO. Benzyloxy-3-cinnamoyl-2-styrylchromones 4a−f
羟基-2-苯乙烯基色酮 5a-i 是通过苄氧基-2-苯乙烯基色酮 3a-i 的脱苄基化制备的,这些苯甲氧基-2-苯乙烯基色酮是通过 Baker-Venkataraman 方法合成的。该方法的最后一步,环脱水 5-芳基-3-羟基-1-(2-羟基芳基)-2,4-戊二烯-1-酮 2a-i,用催化量的碘或 p -甲苯磺酸,在 DMSO 中。苄氧基-3-肉桂酰基-2-苯乙烯基色酮 4a-f 在两种过程中均作为副产物获得,但后一种过程以更好的产率得到苄氧基-2-苯乙烯基色酮 3a-i。所有新化合物的结构都是通过广泛的核磁共振研究确定的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)