Synthesis, stereochemical assignments, and biological activities of homoisoflavonoids
作者:Vidavalur Siddaiah、Chunduri Venkata Rao、Somepalli Venkateswarlu、Alluri V. Krishnaraju、Gottumukkala V. Subbaraju
DOI:10.1016/j.bmc.2005.11.031
日期:2006.4
vitro for their inhibitory activities against 5-lipoxygenase (5-LOX) enzyme. The analog 7-hydroxy-3-[(N,N-dimethylaminophenyl)methylene]chroman-4-one was found to possess potent inhibitory activity and was comparable to that of the standard, nordihydroguiaretic acid. These results suggest that these homoisoflavonoids, with their potent antioxidant and 5-LOX inhibitory activities, may have useful applications
在四个步骤中,从适当取代的苯酚到苯并吡喃-4-酮合成了一系列四种天然存在的异黄酮类化合物和八种类似物。根据NMR光谱数据将产物指定为E-异构体。通过光异构化将E-异构体转化为Z-异构体。E-和Z-异构体显示出明显的化学位移,质子NMR光谱中(E)和(Z)-均异类黄酮之间的差异为确定立体化学提供了一种有用的方法。通过超氧化物歧化酶(NBT)和DPPH自由基清除方法测定了异黄酮类化合物的抗氧化活性。类似物7-羟基-3-[(3,4,5-三羟基苯基)亚甲基] chroman-4-one在这两种方法中均表现出优异的活性,其次是沙酮A,并且其效力比市售抗氧化剂如BHA,BHT等高出数倍。对这些化合物的体外抑制活性进行了评估-脂氧合酶(5-LOX)酶。发现类似物7-羟基-3-[(N,N-二甲基氨基苯基)亚甲基]苯并吡喃-4-酮具有有效的抑制活性,并且与标准的去甲二氢癸二酸相当。这些结果表明,这些同型异黄