NMe Amide as a Synthetic Surrogate for the Thioester Moiety in Thiocoraline

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• 作者：Judit Tulla-Puche ; Eleonora Marcucci ; Elisabet Prats-Alfonso ; Nria Bay-Puxan ; Fernando Albericio
• 刊名：Journal of Medicinal Chemistry
• 出版年：2009
• 出版时间：February 12, 2009
• 年：2009
• 卷：52
• 期：3
• 页码：834-839
• 全文大小：260K
• 年卷期：v.52,no.3(February 12, 2009)
• ISSN：1520-4804

文摘

Bridged N-methyl amides are used as isosteres for depsi and thiodepsi bonds in thiocoraline. The introduction of NMe-amides in bridges mimics the thioester bonds without imposing steric hindrance and allows conservation of the hydrogen bonding map of the natural product. NMe-azathiocoraline was constructed by solid-phase N-methylation of the side chain of diaminopropionic acid (Dap). The three consecutive N-methyl amino acids could be coupled in good yields by using HATU/HOAt/DIEA in DMF, and the final octapeptide was also obtained on solid phase following a 4 + 4 fragment coupling approach. NMe-azathiocoraline (NMA) displayed nanomolar activity in the same order as the natural product and the same mode of action. In fact, modeling of NMe-azathiocoraline bonded to a TCGA sequence showed how the methyl groups remained further away from the DNA strand without changing the recognition pattern of thiocoraline. Moreover, NMe-azathiocoraline displayed an increased stability in human serum as compared to the parent natural product. This approach could be used in other depsipeptides and side chain to side chain cyclic peptides.