Pyrrole azocrown ethers—synthesis, crystal structures, and fluorescence properties
作者:Ewa Wagner-Wysiecka、Tomasz Rzymowski、Marina S. Fonari、Rafał Kulmaczewski、Elżbieta Luboch
DOI:10.1016/j.tet.2011.01.027
日期:2011.3
Pyrrole containing macrocycles with chromophoric and fluorescent residues were prepared. X-ray structures for compounds 1 and 4 were determined. The presented pyrrole azocrowns are lead(II) chemosensors, which can be used both in UV–vis and fluorescence spectroscopy.
Heterocoupling of 2-naphthols enabled by a copper–N-heterocyclic carbene complex
作者:Michael Holtz-Mulholland、Mylène de Léséleuc、Shawn K. Collins
DOI:10.1039/c3cc38675a
日期:——
The reactivity of a Cu catalyst for oxidative coupling is modulated by a small molecule additive, diethyl malonate, that slows over-oxidation of 2-naphthols. Efficient heterocoupling between electron-rich and electron-poor 2-naphthols/2-naphthylamines affords C1-symmetric BINOLs with yields ranging from 35â98%.
Antitumor Agents. 5. Synthesis, Structure−Activity Relationships, and Biological Evaluation of Dimethyl-5<i>H</i>-pyridophenoxazin-5-ones, Tetrahydro-5<i>H</i>-benzopyridophenoxazin-5-ones, and 5<i>H</i>-Benzopyridophenoxazin-5-ones with Potent Antiproliferative Activity
New antiproliferative compounds, dimethyl-5H-pyrido[3,2-a] phenoxazin-5-ones (1-6), tetrahydro-5-Hbenzopyrido[2,3-j]phenoxazin-5-ones (7-9), and 5H-benzopyrido[3,2-a] phenoxazin-5-ones (10-12) were synthesized and evaluated against representative human neoplastic cell lines. Dimethyl derivatives 1-6 were more active against carcinoma than leukemia cell lines. The tetrahydrobenzo derivatives 7-9 were scarcely active, whereas the corresponding benzo derivatives 10-12 showed notable cytotoxicity against a majority of the tested cell lines. Molecular modeling studies indicated that the high potency of 10 and 11, the most cytotoxic compounds of the whole series, could be due to the position of the condensed benzene ring, which favors d-d stacking interactions with purine and pyrimidine bases in the DNA active site. Biological studies suggested that 10-12 have no effect on human topoisomerases I and II and that they induce arrest at the G2/M phase.
Benzoxazinones as PPARγ agonists. part 1: SAR of three aromatic regions
作者:Philip J. Rybczynski、Roxanne E. Zeck、Donald W. Combs、Ignatius Turchi、Thomas P. Burris、Jun Z. Xu、Maria Yang、Keith T. Demarest
DOI:10.1016/s0960-894x(03)00401-3
日期:2003.7
A series of benzoxazinones was synthesized as PPARgamma agonists. The compounds were obtained in seven steps, and SAR was developed by variations to the core shown below. The compounds were tested as functional agonists in the induction of the aP2 gene in preadipocytes, and the most potent compound in the series has an EC50=0.51 muM. The potency was further confirmed through a PPAR-Ga14 construct. Efficacy has been demonstrated in the db/db mouse model of hyperglycemia. (C) 2003 Elsevier Science Ltd. All rights reserved.
Catalytic cyclophanes VII. Esterase activity of a bisimidazolyl-cyclophane
作者:Ito Chao、François Diederich
DOI:10.1002/recl.19931120605
日期:——
that shape the macrocyclic cavity. Four acetic acid residues diverge from the central carbon atoms of the two spacer units and ensure solubility of 3 in water and binary aqueous solvent mixtures. Cyclophane 3 forms stoichiometric inclusion complexes with nitronaphthyl acetates in aqueous phosphate buffers (pH 8) and catalyzes the hydrolysis of bound substrates under turnover conditions.