作者:F. Litvan、W. G. Stoll
DOI:10.1002/hlca.19590420332
日期:——
4-Hydroxycoumarin reacts with substituted salicylaldehydes, 2,6-dichloro- or -chloro-nitro-benzaldehydes to yield unstable 3,3′-benzylidene-bis-(4-hydroxycoumarins), intermediates which undergo ring closure with the hydroxyl group of one of the 4-hydroxycoumarin moieties, producing derivatives of 7-[4′-hydroxycoumarinyl-(3′)]-benzopyrano [ 3,2-c] coumarins.
4-羟基香豆素与取代的水杨醛,2,6-二氯-或-氯-硝基-硝基苯甲醛反应生成不稳定的3,3'-亚苄基-双-(4-羟基香豆素)中间体,其中间体通过一个羟基被闭环的4-羟基香豆素部分,产生7- [4'-羟基香豆素-(3')]-苯并吡喃基[3,2-c]香豆素的衍生物。