A selective oxidative para-acylation of unprotected anilines with methyl groups in N-heteroarylmethanes was achieved. This transformation proceeds under mild metal-free reaction conditions to produce the corresponding valuable diarylmethanones in good to high yields, featuring high site-selectivity, high functional-group-tolerance, gram-scale synthesis and easy product-derivation. Preliminary mechanistic
solvents, whereas the emission spectra showed pronounced red shifts with increasing solvent polarity, suggesting the intramolecular charge transfer character of the emission state. Compounds 4 and 5 can emit lights from blue to green color in different solvents. The solvent polarity dependent electronic transitions are attributed to efficient intramolecular charge transfer (ICT) processes, in which the
Stop-Flow Microtubing Reactor-Assisted Visible Light-Induced Hydrogen-Evolution Cross Coupling of Heteroarenes with C(sp<sup>3</sup>)–H Bonds
作者:Dong-Sheng Li、Tao Liu、Yang Hong、Chen-Lin Cao、Jie Wu、Hong-Ping Deng
DOI:10.1021/acscatal.2c01087
日期:2022.4.15
feedstocks under mild conditions is attractive and highly desirable in pharmaceutical and natural product synthesis. Minisci-type cross dehydrogenative coupling between heteroarenes and C(sp3)–H bonds offers direct access to these important scaffolds in a step-economic manner. Herein, assisted by stop-flow microtubing reactors, an operationally simple protocol for the visiblelight-induced hydrogen-evolution
Synthesis, spectroscopy and computational studies of some biologically important hydroxyhaloquinolines and their novel derivatives
作者:Grzegorz Malecki、Jacek E. Nycz、Ewa Ryrych、Lukasz Ponikiewski、Maria Nowak、Joachim Kusz、Jerzy Pikies
DOI:10.1016/j.molstruc.2010.01.054
日期:2010.4
A series crystalline compounds of methyl and phosphinyl derivatives of 2-methylquinolin-8-ol (1a) and related 5,7-dichloro-2-methylquinolin-8-ol (1b) were quantitatively prepared and characterized by microanalysis, IR, UV-vis and multinuclear NMR spectroscopy. Five of them have been characterized by single crystal X-ray diffraction method. The known compounds, 8-methoxy-2-methylquinoline (2a) and 8-methoxyquinoline (2d), were synthesised by a new route. NMR solution spectra at ambient temperature, showed readily diagnostic H-1 and C-13 signals from methyl groups. The geometries of the studied compounds were optimized in singlet states using the density functional theory (DFT) method with B3LYP functional. In general, the predicted bond lengths and angles are in a good agreement with the values based on the X-ray crystal structure data. Electronic spectra were calculated by TDDFT method. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.