Exploration of the carmaphycins as payloads in antibody drug conjugate anticancer agents
作者:Jehad Almaliti、Bailey Miller、Halina Pietraszkiewicz、Evgenia Glukhov、C. Benjamin Naman、Toni Kline、Jeffrey Hanson、Xiaofan Li、Sihong Zhou、Frederick A. Valeriote、William H. Gerwick
DOI:10.1016/j.ejmech.2018.10.024
日期:2019.1
conjugates (ADCs) represent a new dimension of anticancer chemotherapeutics, with warheads to date generally involving either antitubulin or DNA-directed agents to achieve low-to sub-nanomolar potency. However, other potent cytotoxins working by different pharmacological mechanisms are under investigation, such as α,β-epoxyketone based proteasomeinhibitors. These proteasome active agents are an emerging
We report the discovery of a new bioorthogonalclick‐and‐release reaction involving iminosydnones and strained alkynes. This transformation leads to two products resulting from the ligation and fragmentation of iminosydnones under physiological conditions. Optimized iminosydnones were successfully used to design innovative cleavable linkers for protein modification, thus opening up new areas in the
Copper-catalyzed and copper-free sydnone–alkyne cycloaddition reactions have emerged as complementary click tools for chemical biology but their use in bioorthogonal labeling is still in its infancy. Herein, combinations of alkynes and coumarin-sydnones were screened for their ability to generate pyrazole products displaying strong fluoroscence enhancement compared to reactants. One sydnone was identified
bioconjugation methodology for the introduction of hypervalent iodine compounds onto biomolecules. Ethynylbenziodoxolones (EBXs) engage thiols in small organic molecules and cysteine-containing peptides and proteins in a fast and selective addition onto the alkynyl triple bond, resulting in stable vinylbenziodoxolone hypervalent iodine conjugates. The conjugation occurs at room temperature in an open
reactivity towards both copper‐catalyzed and strain‐promoted cycloaddition reactions with alkynes. Synthetic access to these new mesoionic compounds was granted by electrophilic fluorination of σ‐sydnone PdII precursors in the presence of Selectfluor. Their reactions with terminal and cyclic alkynes were found to proceed very rapidly and selectively, affording 5‐fluoro‐1,4‐pyrazoles with bimolecular
我们报告了4-氟丁酮的合成和反应性,这是一类独特的中离子偶极子,对炔烃的铜催化和应变促进的环加成反应均显示出出色的反应性。在Selectfluor的存在下,通过σ-sydnonePd II前体的亲电氟化反应,可以合成这些新的中离子化合物。发现它们与末端和环状炔烃的反应非常迅速且选择性地进行,从而提供双分子速率常数高达10 4 m -1 s -1的5-氟-1,4-吡唑,超过了文献中有关环炔烃的文献记载。进行了动力学研究以阐明反应的机理,并成功地用[ 18 F] Selectfluor进行了放射性标记,进一步突出了4-氟丁酮的价值。