摘要:
The participation of the beta -hydroxyketone part of callystatin A in the potent cytotoxicity was analyzed through the analogue-syntheses and the assessment of their biological potencies. The ketonic carbonyl, the 19-hydroxyl, and the three asymmetric methyl groups located in the beta -hydroxyketone part of callystatin A were revealed to contribute to the cytotoxic potency, respectively. Moreover, the alpha,beta -unsaturated delta -lactone portion was shown to serve as a conclusive functional group for the cytotoxic activity. (C) 2000 Elsevier Science Ltd. All rights reserved.