Synthesis and photochromism of functionalized benzothiophene-based fulgides and fulgimides
作者:S. I. Luyksaar、V. A. Migulin、B. V. Nabatov、M. M. Krayushkin
DOI:10.1007/s11172-010-0099-y
日期:2010.2
Earlier unknown fulgides and the corresponding functionalized fulgimides containing a primary amino group were obtained. Their photochromism was examined using spectroscopic methods.
Metal‐Free Arylation of Benzothiophenes at C4 by Activation as their Benzothiophene S‐Oxides
作者:Ranjana Bisht、Mihai V Popescu、Zhen He、Ameer M Ibrahim、Giacomo E M Crisenza、Robert S Paton、David John Procter
DOI:10.1002/anie.202302418
日期:——
key structures in materials and medicines and methods for their selective C−H functionalization are highly prized. Activation of benzothiophenes bearing electron-withdrawing groups at C3 as their S-oxides enables formal C−H/C−H coupling with phenols to access C4 arylated benzothiophenes. Computational studies suggest the intermediacy of a π-complex between the benzothiophene and a phenoxonium cation
Recent studies have suggested that the alpha 7 nicotinic acetylcholine receptors play important roles in learning and memory. Herein, we describe our research of the structure-activity relationships (SAR) in a series of (S)-spiro[1-azabicyclo[2.2.2]octane-3,5'-oxazolidin]-2'-ones bearing various bicyclic moieties to discover novel alpha 7 receptor agonists. Through a number of SAR studies on the series, we have found out that inhibition of CYP 2D6 isozyme, which was a primary obstacle for the previously identified compound, was avoidable by the introduction of bicyclic moieties. Chemical optimization of the series led to the identification of a novel and potent alpha 7 nicotinic acetylcholine receptor partial agonist 23. This compound not only possessed high binding affinity (K-i) 3 nmol/L) toward the alpha 7 receptor but also showed agonistic activity even at a concentration of 0.1 mu mol/L. In addition, compound 23 improved cognition in several rat models, which might suggest the potential of the alpha 7 receptor partial agonist for the treatment of neurological disorders including cognitive dysfunction.