Derivatives of squaric acid with anti-proliferative activity
申请人:GPC Biotech AG
公开号:EP1674457B1
公开(公告)日:2009-06-03
US8450348B2
申请人:——
公开号:US8450348B2
公开(公告)日:2013-05-28
Non-proteinogenic amino acids in the pThr-2 position of a pentamer peptide that confer high binding affinity for the polo box domain (PBD) of polo-like kinase 1 (Plk1)
作者:Wen-Jian Qian、Jung-Eun Park、Kyung S. Lee、Terrence R. Burke
DOI:10.1016/j.bmcl.2012.10.093
日期:2012.12
We report herein that incorporating long-chain alkylphenyl-containing non-proteinogenic amino acids in place of His at the pT-2 position of the parent polo-like kinase 1 (Plk1) polo box domain (PBD)-binding pentapeptide, PLHSpT (1a) increases affinity. For certain analogs, approximately two orders-of-magnitude improvement in affinity was observed. Although, none of the new analogs was as potent as our previously described peptide 1b, in which the pT-2 histidine imidazole ring is alkylated at its pi nitrogen (N3), our current finding that the isomeric His(N1)-analog (1c) binds with approximately 50-fold less affinity than 1b, indicates the positional importance of attachment to the His imidazole ring. Our demonstration that a range of modified residues at the pT-2 position can enhance binding affinity, should facilitate the development of minimally-sized Plk1 PBD-binding antagonists. Published by Elsevier Ltd.
Divergent [2 + <i>n</i>] Heteroannulation of β-CF<sub>3</sub>-1,3-enynes with Alkyl Azides via Hydrogen Atom Transfer and Radical Substitution
作者:Yu-Zhong Yang、Qi Xue、Zhi-Qiang Xiong、Yang Li、Xuan-Hui Ouyang、Ming Hu、Jin-Heng Li
DOI:10.1021/acs.orglett.3c04041
日期:2024.2.2
A copper-promoted divergent intermolecular [2 + n] heteroannulation of β-CF3-1,3-enynes with alkyl azides via alkyl radical-driven HAT and radical substitution (C–C bond formation) to form four- to ten-membered saturated N-heterocycles is developed. This method enables the aryl-induced or kinetically controlled site selective functionalization of the remote C(sp3)–H bonds at positions 2, 3, 4, 5, 6
铜促进的β-CF 3 -1,3-烯炔与烷基叠氮化物的发散分子间[2 + n ]杂环化,通过烷基驱动的HAT和自由基取代(C-C键形成)形成四至十元开发了饱和N-杂环。该方法能够通过三重态氮烯形成、自由基对氮原子进行芳基诱导或动力学控制的位点选择性官能化,将位置 2、3、4、5、6、7 或 8 处的远程 C(sp 3 )–H 键官能化。跨 C=C 键、HAT 和自由基取代级联进行加成,具有广泛的底物范围、出色的位点选择性以及生物活性分子易于后期衍生化的特点。最初的氘标记和对照实验揭示了通过氮烯形成和 HAT 的反应机制。