Syntheses of fluorescent dyes. IX. New 4-hydroxycoumarins, 4-hydroxy-2-quinolones, 2<i>H</i>,5<i>H</i>-Pyrano[3,2-<i>c</i>]benzopyran-2,5-diones and 2<i>H</i>,5<i>H</i>-Pyrano[3,2-<i>c</i>]quinoline-2,5-diones
作者:Andreas Knierzinger、Otto S. Wolfbeis
DOI:10.1002/jhet.5570170204
日期:1980.3
7-Substituted 4-hydroxycoumarins (2a-e) and 4-hydroxy-2-quinolones (2f-i) have been synthesized from the appropriate phenols or anilines and were converted to the enamines 3 using triethoxymethane and aniline. Condensation of 3 with nitriles 4a-h gave substituted 2H,5H-pyrano[3,2-c]benzopyran-2,5-diones (5a-r) or 2H,5H-pyrano[3,2-c]quinoline-2,5-diones (5s-x), which exhibit both spontaneous and stimulated
由适当的酚或苯胺合成了7位取代的4-羟基香豆素(2a-e)和4-羟基-2-喹诺酮(2f-i),并使用三乙氧基甲烷和苯胺将其转化为烯胺3。3与腈4a-h的缩合反应生成2 H,5 H-吡喃并[3,2- c ]苯并吡喃-2,5-二酮(5a-r)或2 H,5 H-吡喃并[3,2- c ]喹啉-2,5-二酮(5s-x),显示出自发的和受激的荧光,最大值介于418和549 nm之间。7a,b(由2d,e和3-氧代丁酸乙酯合成)的荧光光谱证明了5中的吸电子3取代基的显着影响,与化合物21-r相比,其最大值急剧转变为蓝色。。