The contribution of achiral residues in the laspartomycin family of calcium-dependent lipopeptide antibiotics
作者:Thomas M. Wood、Kristine Bertheussen、Nathaniel I. Martin
DOI:10.1039/c9ob02534k
日期:——
promising source of new antibiotic agents that are rich in structural and mechanistic diversity. Over forty unique CDAs have been identified to date and share a number of common features. Recent efforts in our group have provided new mechanistic and structural insights into the laspartomycin family of CDAs. We here describe investigations aimed at probing the role of the three glycineresidues found in the
Solid-Phase Synthesis of Aza-Kahalalide F Analogues: (2<i>R</i>,3<i>R</i>)-2-Amino-3-azidobutanoic Acid as Precursor of the Aza-Threonine
作者:Irene Izzo、Gerardo A. Acosta、Judit Tulla-Puche、Tommaso Cupido、Maria Jesus Martin-Lopez、Carmen Cuevas、Fernando Albericio
DOI:10.1002/ejoc.200901345
日期:2010.5
The solid-phasesynthesis of six novel analogues of Kahalalide F (KF), a natural product currently undergoing Phase II clinical trials, is reported. In all these compounds, amides were used as isosteres for the depsi bond. For two of these compounds, we performed an efficient synthesis of N-Fmoc-protected (2R,3R)-2-amino-3-azidobutanoic acid, precursor of the aza-threonine. This is the first example
据报道,目前正在进行 II 期临床试验的天然产物 Kahalalide F (KF) 的六种新型类似物的固相合成。在所有这些化合物中,酰胺被用作 depsi 键的等排体。对于这些化合物中的两种,我们进行了 N-Fmoc 保护的 (2R,3R)-2-amino-3-azidobutanoic 酸(氮杂苏氨酸的前体)的有效合成。这是在固相中制备含氮杂-苏氨酸的肽中叠氮基团的固相还原的第一个例子。
Orthogonal Chemistry for the Synthesis of Thiocoraline–Triostin Hybrids. Exploring their Structure–Activity Relationship
The natural compounds triostin and thiocoraline are potent antitumor agents that act as DNA bisintercalators. From a pharmaceutical point of view, these compounds are highly attractive although they present a low pharmacokinetic profile, in part due to their low solubility. Synthetically, they represent a tour de force because no robust strategies have been developed to access a broad range of these bicyclic (depsi)peptides in a straightforward manner. Here we describe solid-phase strategies to synthesize new bisintercalators, such as thiocoraline triostin hybrids, as well is analogues bearing soluble tags. Orthogonal protection schemes (up to, five from: Fmoc, Boc Alloc, pNZ, o-NBS, and Troc), together with the right concourse of the coupling reagents (HOSu, HOBt, HOAt, Oxyma, EDC, DIPCDI, PyAOP, PyBOP, HATU, COMU), were crucial to establish the synthetic plan. In vitro studies and structure activity relationships have been shown trends in the structure activity relationship that Will facilitate the design of new bisintercalators.
Structure −Activity Relationship Studies of Targeting Ligands against Breast Cancer Cells
作者:Nianhuan Yao、Wenwu Xiao、Leah Meza、Harry Tseng、Mathida Chuck、Kit S. Lam
DOI:10.1021/jm9012032
日期:2009.11.12
A series of LXY3 (1) analogues were designed and synthesized. Their binding affinity was demonstrated using MDA-MB-231 breast cancer cells adherence inhibition assay. Further structure-activity relationship was obtained. Analogue 29 was discovered to have 3.5-fold increase of the binding affinity. Fluorescent microscopy and in vivo and ex vivo imaging studies demonstrated that 29 is tin efficient in vivo targeting agent against alpha 3 integrin of MDA-MB-231 breast tumor xenograft implant.