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Enantioselective synthesis of encecaline-derived potent antimalarial agents
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 2250772
Author(s) Harel, Dipak; Schepmann, Dirk; Brun, Reto; Schmidt, Thomas J; Wünsch, Bernhard
Author(s) at UniBasel Brun, Reto
Year 2013
Title Enantioselective synthesis of encecaline-derived potent antimalarial agents
Journal Organic & biomolecular chemistry : an international journal of synthetic, physical and biomolecular organic chemistry
Volume 11
Number 42
Pages / Article-Number 7342-9
Abstract

The high antiplasmodial activity of racemic benzylamines rac-1 and rac-2 stimulated the synthesis of pure enantiomers. Ellman's chiral sulfinamides (S)-6 and (R)-6 were used as chiral auxiliaries. Condensation of prochiral ketone 5 with enantiomerically pure sulfinamides (S)-6 and (R)-6 and subsequent NaBH4 reduction provided predominantly unlike configured diastereomers (S,R)-8 and (R,S)-8 (ratio unlike-8:like-8 = 90:10). The same transformation of phenol 4 led to the diastereomeric sulfinamides (S,R)-12 and (S,S)-12 in the ratio 60:40. Acid hydrolysis of the diastereomerically pure sulfinamides followed by monobenzylation yielded the enantiomerically pure benzylamines (R)-1, (S)-1, (R)-2 and (S)-2. The enantiomeric purity of the products was proven by chiral HPLC and the absolute configuration by CD-spectroscopy. Generally, benzylamines with (R)-configuration show higher antiplasmodial activity than their corresponding (S)-configured enantiomers. Phenol (R)-2 represents a very potent lead against P. falciparum, with an IC50 value of only 0.026 μM against the NF54 strain. The very high eudismic ratio of 34 indicates the enantioselective interaction of phenol (R)-2 with a particular target protein of P. falciparum.

Publisher Royal Society of Chemistry
ISSN/ISBN 1477-0520
edoc-URL http://edoc.unibas.ch/dok/A6194656
Full Text on edoc No
Digital Object Identifier DOI 10.1039/c3ob41583j
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/24064863
ISI-Number WOS:000326310800012
Document type (ISI) Journal Article
 
   

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