Prodrug Study of Plinabulin Using a Click Strategy Focused on the Effects of a Replaceable Water-Solubilizing Moiety

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Plinabulin (1) is a potent anti-microtubule agent, however, its low water solubility has to be improved for the advantage in pharmacokinetics and chemotherapy. In this report, the replaceable water-solubilizing moiety of the water-soluble prodrug of plinabulin (1) was investigated. The properties of the water-soluble prodrugs of plinabulin (1), in which the water-solubilizing part was replaced with a new functionality, were evaluated. The newly introduced water-solubilizing moiety provided interesting effects on the water solubility and half-life of the prodrugs.