Synthesis and Characterization of Potent Bivalent Amyloidosis Inhibitors That Bind Prior to Transthyretin Tetramerization
作者:Nora S. Green、Satheesh K. Palaninathan、James C. Sacchettini、Jeffery W. Kelly
DOI:10.1021/ja030294z
日期:2003.11.1
The misfolding of transthyretin (TTR), including rate-limiting tetramer dissociation and partial monomer denaturation, is sufficient for TTR misassembly into amyloid and other abnormal quaternary structures associated with senile systemic amyloidosis, familial amyloid polyneuropathy, and familial amyloid cardiomyopathy. Monovalent small molecules that bind to one or both of the unoccupied thyroid hormone
see text] A 2-(2,6-diisopropylphenyl)iminomethylpyridine (1a)/CoCl(2).6H(2)O/Zn reagent has been developed as an effective instant catalyst for the intra- and intermolecular cyclotrimerization of alkynes to substituted benzenes, making the method extremely practical since the reagent, 1a/CoCl(2).6H(2)O/Zn, is inexpensive and easy to handle and the reaction is less sensitive to moisture and is reasonably
Preparation of alkyne-labeled 2-nitroimidazoles for identification of tumor hypoxia by Raman spectroscopy
作者:Ryohsuke Kurihara、Yuta Ikemura、Kazuhito Tanabe
DOI:10.1016/j.bmcl.2016.09.024
日期:2016.10
consisting of nitroimidazole as a hypoxia-targeting unit and acetylene group as the signal-emitting unit. Among IM-ACs synthesized in this study, IM-AC possessing a diacetylene group (IM-AC 3), showed suitable properties as a hypoxia indicator. When administered to A549 cells, we observed a strong signal of IM-AC 3 around 2200 cm−1 in the Raman spectra from hypoxic cells. Ex vivo experiments suggest that IM-AC
缺氧是实体瘤的特征。本文中,我们开发了用于拉曼光谱分析的新型缺氧敏感探针(IM-AC),该探针由硝基咪唑作为缺氧靶向单元,乙炔基为信号发射单元。在这项研究中合成的IM-AC中,具有联乙炔基(IM-AC 3)的IM-AC显示出合适的性能作为缺氧指示剂。当对A549细胞给药时,我们在低氧细胞的拉曼光谱中观察到了2200 cm -1附近的IM-AC 3的强信号。体外实验表明,IM-AC 3保留在低氧肿瘤组织中并发出强信号。
An Atom-Economic and Selective Ruthenium-Catalyzed Redox Isomerization of Propargylic Alcohols. An Efficient Strategy for the Synthesis of Leukotrienes
作者:Barry M. Trost、Robert C. Livingston
DOI:10.1021/ja804105m
日期:2008.9.10
secondary propargylicalcohols in good yields to provide trans enals and enones exclusively. Readily available indenylbis(triphenylphosphine)ruthenium chloride, in the presence of indium triflate and camphorsulfonic acid, gives the best turnover numbers and reactivity with the broadest range of substrates. Deuterium labeling experiments suggest that the process occurs through propargylic hydride migration
A stereoselective synthesis of the biologically interesting γ-monofluorinated goniothalamin analogue 2a was described. The features of the synthesis included regioselective reduction of the unprotected hydroxypropynyl moiety of compound 10 by Red-Al, asymmetric Sharpless epoxidation of allyl alcohol 11, and regio- and stereoselectivering-opening hydrofluorination of the hydroxypropynyl epoxide 14