Denigrins A–C: new antitubercular 3,4-diarylpyrrole alkaloids fromDendrilla nigra
摘要:
Chemical diversity is vital to antitubercular drug discovery as it ensures a novel bioactivity profile. Marine sponges have so far provided more than 1000 new bioactive molecules. Ethyl acetate extract of the marine sponge Dendrilla nigra on bioactivity-guided screening yielded three new compounds denigrins A-C, with potent antitubercular activity. Spectral and chemical analyses confirmed that these three compounds belong to the 3,4-diaryl pyrrole alkaloid category. The presence of monohydroxy substitution on benzene rings is not very common in lamellarin and related 3,4-diaryl pyrrole alkaloids isolated from marine invertebrates. Among these, denigrin C showed highest potency (minimum inhibitory concentration 4g/mL) against Mycobacterium tuberculosis H37Rv.
DOI:
10.1080/14786419.2014.891112
作为产物:
描述:
7-methoxy-3-(4-methoxy-phenethyl)-1,4-bis(4-methoxyphenyl)-2H-benzo[e]indole-2,5(3H)-dione 在
三溴化硼 作用下,
以
二氯甲烷 为溶剂,
以61 %的产率得到denigrin C
参考文献:
名称:
德尼格林 A、B、C、F 和 G、3,4-二芳基吡咯和吡咯烷酮生物碱结构的全合成,以及同系物 B 转化为共代谢物螺螨酮
摘要:
标题海洋天然产物是通过全合成方法制备的,同系物3、6和7是首次制备。这些都是通过操作容易制备的 denigrin B ( 2 ) 获得的。分配给 denigrin C 的结构3被证明是不正确的。化合物2与DDQ的反应以高产率产生相关的天然产物螺缩酮( 16 ),同时用PIFA/BF 3 ·Et 2 O处理相应的全甲基醚15 ,得到具有异构骨架的化合物20 。