Abstract
The utility of natural products for identifying anticancer agents has been highly pursued in the last decades and over 100 drug molecules in clinic are natural products or natural product-derived compounds. Natural products are believed to be able to cover unexplored chemical space that is normally not occupied by commercially available molecule libraries. However, the low abundance and synthetic intractability of natural products have limited their applications in drug discovery. Recently, the identification of biologically relevant fragments derived from biologically validated natural products has been recognized as a powerful strategy in searching new biological probes and drugs. The spirocyclic oxindoles, as privileged structural scaffolds, have shown their potential in designing new drugs. Several anticancer drug candidates such as SAR405838, RO8994, CFI-400945 and their bioisosteres are undergoing clinical trials or preclinical studies. To highlight the significant progress, we focus on illustrating the discovery of SAR405838, RO8994, CFI-400945 and their bioisosteres for cancer therapy using substructure-based strategies and discussing modes of action, binding models and preclinical data.
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