76632-23-0Relevant articles and documents
12,13-Aziridinyl Epothilones. Stereoselective Synthesis of Trisubstituted Olefinic Bonds from Methyl Ketones and Heteroaromatic Phosphonates and Design, Synthesis, and Biological Evaluation of Potent Antitumor Agents
Nicolaou,Rhoades, Derek,Wang, Yanping,Bai, Ruoli,Hamel, Ernest,Aujay, Monette,Sandoval, Joseph,Gavrilyuk, Julia
supporting information, p. 7318 - 7334 (2017/06/06)
The synthesis and biological evaluation of a series of 12,13-aziridinyl epothilone B analogues is described. These compounds were accessed by a practical, general process that involved a 12,13-olefinic methyl ketone as a starting material obtained by ozonolytic cleavage of epothilone B followed by tungsten-induced deoxygenation of the epoxide moiety. The attachment of the aziridine structural motif was achieved by application of the Ess-Kürti-Falck aziridination, while the heterocyclic side chains were introduced via stereoselective phosphonate-based olefinations. In order to ensure high (E) selectivities for the latter reaction for electron-rich heterocycles, it became necessary to develop and apply an unprecedented modification of the venerable Horner-Wadsworth-Emmons reaction, employing 2-fluoroethoxyphosphonates that may prove to be of general value in organic synthesis. These studies resulted in the discovery of some of the most potent epothilones reported to date. Equipped with functional groups to accommodate modern drug delivery technologies, some of these compounds exhibited picomolar potencies that qualify them as payloads for antibody drug conjugates (ADCs), while a number of them revealed impressive activities against drug resistant human cancer cells, making them desirable for potential medical applications.
PAR4 AGONIST PEPTIDES
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Page/Page column, (2013/11/06)
The present invention provides PAR4 agonist peptides. These peptides are useful for developing robust PAR4 receptor assays.
Design, synthesis, and biological testing of potential heme-coordinating nitric oxide synthase inhibitors
Litzinger, Elizabeth A.,Martasek, Pavel,Roman, Linda J.,Silverman, Richard B.
, p. 3185 - 3198 (2007/10/03)
Based on computer modeling of the active site of nitric oxide synthases (NOS), a series of 10 amidine compounds (9-18) was designed including potential inhibitors that involve the coordination of side-chain functional groups with the iron of the heme cofactor. The most potent and selective compound was the methylthio amidine analogue 9, which was more potent than l-nitroarginine with 185-fold selectivity for inhibition of neuronal NOS over endothelial NOS. It also exhibited time-dependent inhibition, but did not involve the mechanism previously proposed for other amidine inhibitors of NOS. None of the compounds, however, exhibited heme-binding characteristics according to absorption spectroscopy.