Solventless Regeneration of Ketones from Thioketones using Clay Supported Nitrate Salts and Microwave Irradiation
摘要:
Thioketones are readily converted into the corresponding ketones under solvent-free conditions using clayfen or clayan in a process that is accelerated by microwave irradiation.
Synthesis of flavones, 4-thioflavones and 4-iminoflavones was carried out with the substitution of variable halogens, methyl, methoxy and nitro groups in the A, B and AB rings of the respective compounds and we also report here their antibacterialactivity. Most of the synthesized compounds were found to be active against Escherichia coli, Bacillus subtilis, Shigella flexnari, Salmonella aureus, Salmonella
3-diketones is described. Cyclodehydration of a range of β-diketones and thionation of the resulting flavones was achieved using thiophosphorylchloride (PSCl3) which serves as both a catalyst and thionating agent. β-diketones - flavones - thioflavones - thiophosphorylchloride
source of sulfur-atom was replaced by silicon disulfide or boron sulfide, but these two reagents proved to be highly sensitive to water. The data available in some other reports about the conversion of substituted flavones into substituted 4-thioflavones via 4,4-dicholorflavenes [11, 13, 15] does not provide information to evaluate the influence of substitution on the thiation of the flavones. Then again
A new series of synthetic flavones, thioflavones, and flavanones has been synthesized and evaluated as potential inhibitors of monoamine oxidase isoforms (MAO-A and -B). The most active series is the flavanone one with higher selective inhibitory activity against MAO-B. Some of these flavanones (mainly the most effective) have been separated and tested as single enantiomers. In order to investigate the MAOs recognition of the most active and selective compounds, a molecular modeling study has been performed using available Protein Data Bank (PDB) structures as receptor models for docking experiments. (C) 2009 Elsevier Ltd. All rights reserved.