Regioselective Enzymatic Carboxylation of Bioactive (Poly)phenols
作者:Katharina Plasch、Verena Resch、Julien Hitce、Jarosław Popłoński、Kurt Faber、Silvia M. Glueck
DOI:10.1002/adsc.201601046
日期:2017.3.20
In order to extend the applicability of the regioselective enzymaticcarboxylation of phenols, the substrate scope of o-benzoic acid (de)carboxylases has been investigated towards complex molecules with an emphasis on flavouring agents and polyphenols possessing antioxidant properties. o-Hydroxycarboxylic acid products were obtained with perfect regioselectivity, in moderate to excellent yields. The
Process for the preparation of arylalkylamines and substituted arylalkylamines
申请人:HOECHST CELANESE CORPORATION
公开号:EP0481705A1
公开(公告)日:1992-04-22
Arylalkylamines (as a sulfate salt) e.g. tyramine sulfate, are prepared by reacting substituted or unsubstituted arylalkylketones with a lower alkylnitrite in the presence of hydrogen chloride in a dipolar aprotic solvent, then combining the reaction mixture with water and extracting it with a lower alkyl ester or alcohol to recover an aryl-α-oximinoalkylketone extract. The extract, combined with a supported hydrogenation catalyst (e.g. palladium on carbon) in a nonaqueous reaction medium of a major proportion of a mildly protic carboxylic acid (e.g. acetic acid) and a minor proportion of a srong inorganic acid (e.g. sulfuric acid), which is effective in the presence of the catalyst for secondary alcohol dehydration and active as an absorbant for water produced in the dehydration reaction, is hydrogenated to produce the arylalkylamine sulfate sale.
Syntheses and in Vitro Antiplasmodial Activity of Aminoalkylated Chalcones and Analogues
作者:Anke Wilhelm、Pravin Kendrekar、Anwar E. M. Noreljaleel、Efrem T. Abay、Susan L. Bonnet、Lubbe Wiesner、Carmen de Kock、Kenneth J. Swart、Jan Hendrik van der Westhuizen
DOI:10.1021/acs.jnatprod.5b00114
日期:2015.8.28
A series of readily synthesized and inexpensive aminoalkylated chalcones and diarylpropane analogues (1-55) were synthesized and tested against chloroquinone-sensitive (D10 and NF54) and -resistant (Dd2 and K1) strains of Plasmodium falciparum. Hydrogenation of the enone to a diarylpropane moiety increased antiplasmodial bioactivity significantly. The influence of the structure of the amine moiety, A-ring substituents, propyl vs ethyl linker, and chloride salt formation on further enhancing antiplasmodial activity was investigated. Several compounds have IC50 values similar to or better than chloroquine (CQ). The most active compound (26) had an IC50 value of 0.01 mu M. No signs of resistance were detected, as can be expected from compounds with structures unrelated to CQ and other currently used antimalarial drugs. Toxicity tests (in vitro CHO cell assay) gave high SI indices.
Murphy, William S.; Wattanasin, Sompong, Journal of the Chemical Society. Perkin transactions I, 1980, p. 1567 - 1577