Studies of NMR Chemical Shifts of Chalcone Derivatives of Five‐membered Monoheterocycles and Determination of Aromaticity Indices
作者:Eun Jeong Jeong、In‐Sook Han Lee
DOI:10.1002/bkcs.11749
日期:2019.7
(E)‐1‐heteroaryl‐3‐arylpropen‐1‐ones. The 13C chemicalshift values (δC) of the chalcone derivatives were determined in order to find if they correlated with the Hammett σ values. A good correlation, especially for the β‐C for both series, was found for the 13C chemicalshift values (δC) of the chalcone derivatives with the Hammett σ values. The chemicalshift values of the β‐C of the heterocyclic compounds
Ruthenium‐Catalyzed Site‐selective Enone Carbonyl Directed
<i>ortho</i>
‐C−H Activation of Aromatics and Heteroaromatics with Alkenes
作者:Manickam Bakthadoss、Polu Vijay Kumar
DOI:10.1002/adsc.201800376
日期:2018.7.16
enone carbonyl directed orthoC−H activation of aromatics and heteroaromatics with alkenes for the construction of functionalized ortho‐olefinated chalcone derivatives in excellent yields in a regio‐ and stereoselective fashion has been developed for the first time. This general protocol involves chelation assisted oxidative coupling in the presence of ruthenium catalyst through C−H bond activation. This
Regiospecific synthesis and biological evaluation of spirooxindolopyrrolizidines via [3+2] cycloaddition of azomethine ylide
作者:Arumugam Thangamani
DOI:10.1016/j.ejmech.2010.09.051
日期:2010.12
Reaction of (E)-3-aryl-1-(thiophen-2-yl)prop-2-en-1-ones with azomethine ylide (generated in situ via decarboxylative condensation of isatin with L-proline) in refluxing methanol afforded 1'-(aryl)-2'-(2-thienylcarbonyl)-spiro[3H-indole-3,3'-[3H]pyrrolizin]-2-ones as the sole product in a regiospecific manner. The synthesized compounds have been characterized by their elemental, analytical and spectral studies. The synthesized compounds were screened for their antibacterial and antifungal activities against a spectrum of microbial organisms. These studies proved that compounds 1'-(p-chlorophenyl)-2'-(2-thienylcarbonyl)-spiro[3H-indole-3,3'-[3H]pyrrolizin]-2-one (4b), 1'-(p-fluorophenyl)-2'-(2-thienylcarbonyl)-spiro[3H-indole-3,3'-[3H] pyrrolizin]-2-one (4d) and 1'-(p-methoxyphenyl)-2'-(2-thienylcarbonyl)-spiro[3H-indole-3,3'[3H] pyrrolizin]-2-one (4h) against Staphylococcus aureus, 1'-(p-chlorophenyl)-2'-(2-thienylcarbonyl)-spiro[3H-indole-3,3'[3H]pyrrolizin]-2-one (4b), 1'-(p-methylphenyl)-2'-(2-thienylcarbonyl)-spiro[3H-indole-3,3'-[3H]pyrrolizin]-2-one (4c) and 1'-(p-fluorophenyl)-2'-(2-thienylcarbonyl)-spiro[3H-indole-3,3'[3H]pyrrolizin]-2-one (4d) against Salmonella typhi show maximum inhibition potency at low concentration (6.25 mu g/mL) whereas 4d against Candida albicans and 4b and 4d against Rhizopus sp. showed beneficial antifungal activity at minimum concentration. (C) 2010 Elsevier Masson SAS. All rights reserved.