Synthesis and evaluation of the performance of a small molecule library based on diverse tropane-related scaffolds
作者:Robert A. Lowe、Dale Taylor、Kelly Chibale、Adam Nelson、Stephen P. Marsden
DOI:10.1016/j.bmc.2020.115442
日期:2020.5
to the key bicyclic intermediates. A set of 53 screening compounds was designed, synthesised and evaluated in order to determine the biological relevance of the scaffolds accessible using the synthetic approach. Two inhibitors of Hedgehog signalling, and four compounds with weak activity against the parasite P. falciparum, were discovered. Three of the active compounds may be considered to be indotropane
Structural considerations for charge‐enhanced Brønsted acid catalysts
作者:Curtis Payne、Steven R. Kass
DOI:10.1002/poc.4069
日期:2020.8
All three N‐methylated and N‐protonated hydroxypyridinium BArF4– salt isomers were synthesized and their hydrogen bond donating abilities were investigated. DFT and G4 theory computations along with IR spectroscopic measurements were found to be effective methods for predicting the catalytic activities of these O–H and N–H Brønsted acids. A UV‐vis titration approach for rapidly quantifying hydrogen
所有三个N-甲基化和N-质子化的羟基吡啶鎓BAr F 4 –合成了各种盐异构体,研究了其氢键给体能力。发现DFT和G4理论计算以及红外光谱测量是预测这些OH和NHBrønsted酸的催化活性的有效方法。用UV-vis滴定法快速量化氢键的给定能力表明,碳氢键也可以参与静电相互作用,但是存在多个平衡络合物导致该方法的局限性。在羟吡啶的甲基化系列中,相对于间位衍生物,邻位和对位异构体显示出适度的速率增强。质子化引入了一个新的酸性位点,而邻羟基吡啶鎓离子盐比所有其他被研究的物种具有明显更高的活性。
Amino acids and peptides. XIII. Synthetic studies on N-terminal tripeptide amide analogs of fibrin .ALPHA.-chain.
N-Terminal tripeptide analogs of fibrin alpha-chain were synthesized and their inhibitory effect on fibrinogen/thrombin clotting was examined. A new water-soluble active ester, 3-pyridinium ester, was used for the synthesis. Among the synthetic peptides, H-Gly-Pro-Arg-hexamethyleneimine exhibited the highest inhibitory effect on fibrinogen-thrombin clotting.
Simple acyclic molecules containing a single charge-assisted O–H group can recognize anions in acetonitrile : water mixtures
作者:Rosemary J. Goodwin、Mitchell T. Blyth、Alfred K. K. Fung、Leesa M. Smith、Philip L. Norcott、Sara Tanovic、Michelle L. Coote、Nicholas G. White
DOI:10.1039/d1ob00282a
日期:——
charges. Crystal structures of both compounds with coordinating anions were obtained, and feature short O–H⋯anion hydrogen bonds. A receptor containing two hydroxyquinolinium groups was also prepared. While the low solubility of this compound caused difficulties, we were able to demonstrate chloride binding in a competitive 1 : 1 CD3CN : CD3OD solvent mixture. Addition of sulfate to this compound results
Highly diastereoselective 1,3-dipolar cycloaddition reactions of trans-2-methylene-1,3-dithiolane 1,3-dioxide with 3-oxidopyridinium and 3-oxidopyrylium betaines: a route to the tropane skeleton
作者:Varinder K. Aggarwal、Richard S. Grainger、Gary K. Newton、Peter L. Spargo、Adrian D. Hobson、Harry Adams
DOI:10.1039/b302834h
日期:——
The C2-symmetric vinyl sulfoxide, trans-2-methylene-1,3-dithiolane1,3-dioxide, was found to react with a range of 3-oxidopyridinium betaines (bearing different substituents on nitrogen) in high yield and with total diastereoselectivity. A 2.3:1 mixture of regioisomers was formed with all of the 3-oxidopyridinium betaines but the ratio was found to change over prolonged periods of time due to reversibility