Design and preparation of serine–threonine protein phosphatase inhibitors based upon the nodularin and microcystin toxin structures. Part 3 †
作者:Kerri L. Webster、Antony B. Maude、Michael E. O'Donnell、Amit P. Mehrotra、David Gani
DOI:10.1039/b100401h
日期:——
Nodularin and microcystins are complex natural cyclic isopeptidic hepatotoxins that serve as subnanomolar inhibitors of the eukaryotic serine–threonine protein phosphatases PP1 and PP2A, enzymes that are intimately involved in controlling cellular metabolism. Previously we described a solution-phase synthesis of stripped-down nodularin analogues; cyclo[-β-Ala-(R)-Glu-α-OMe-γ-Sar-(R)-Asp-α-OMe-β-(S)-Phe-]
结节菌素和微囊藻毒素是复杂的天然环状异肽肝毒素,可作为真核丝氨酸-苏氨酸蛋白磷酸酶PP1和PP2A的亚纳摩尔抑制剂,这些酶密切参与控制细胞代谢。以前,我们描述了剥离的结核菌素类似物的溶液相合成。环[-β-Ala-(R)-Glu-α-OMe-γ-Sar-(R)-Asp-α-OMe-β-(S)-Phe-] 3和环[-(3 R)- 3-羟甲基-β-Ala-(R)-Glu-α-OMe-γ-Sar-(R)-Asp-α-OMe-β-(S)-Phe-] 5。综合策略旨在允许宏环化后的阐述。在这里,我们研究了引入多样性并实现大环内酰胺化的替代方法,并比较了大环化合物的固相和固相肽合成的相对效率。大环环-[((2 R)-α-4-苄基哌啶基酰胺基-Asp] -β-[(R)-Glu ] -Sar -[(R -Asp )-β-]大环的合成及生物学活性(S)-Phe-} 29和环-(2 S)-Phe-[(2 R