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Expanding indole diversity: direct 1-step synthesis of 1,2-fused indoles and spiroindolines from 2-halo anilines for fast SAR antiviral elucidation against tobacco mosaic virus (TMV).
Molecular Diversity 2017 Februrary
To systematically investigate the influence of the variation of the original skeletons and spatial configuration of 2,3-fused indole natural products on antiviral activities, two types of structurally novel and potent pseudo-indole natural product derivatives, 1,2-fused indole and spiroindoline, with different substituents were direct synthesized from 2-halo anilines, and their antiviral activities against tobacco mosaic virus (TMV) were evaluated. The results showed that these compounds exhibited good anti-TMV activity, especially 3f, 3g, 3i, 5e, 5h, and 5l, which were more potent than the commercial anti-virus agent ribavirin. An SAR investigation demonstrates that the original ring size, arrangement, and planarity are not optimal; their anti-TMV activities can be improved by skeleton modification and spatial configuration variation. Both of the structurally novel skeletons provide a new template for antiviral studies, which may also provide some useful information for antiviral mechanism elucidation.
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