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Issue 23, 2014
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Convergent and enantioselective syntheses of cytosolic phospholipase A2α inhibiting N-(1-indazol-1-ylpropan-2-yl)carbamates

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Abstract

Cytosolic phospholipase A2α (cPLA2α) is an important enzyme of the inflammation cascade. Therefore, inhibitors of cPLA2α are assumed to be promising drug candidates for the treatment of inflammatory disorders. Recently we have found that indole-5-carboxylic acid with a 3-(4-octylphenoxy)-2-(phenoxycarbonylamino)propyl substituent in position 1 is an inhibitor of cPLA2α. We have now synthesized a corresponding derivative with the indole heterocycle replaced by an indazole (4) employing an analogous reaction sequence as for the synthesis of the indole derivative. Besides, a more convergent synthesis for 4 was established using an aziridine as central intermediate. Furthermore, a chiral-pool based enantioselective synthesis was developed for the synthesis of (R)- and (S)-4. Starting compound for both enantiomers was the (R)-serine derived oxazolidine (R)-25. Compound 4 proved to be a moderate inhibitor of cPLA2α, with the S-enantiomer being twice as active as the R-enantiomer. The racemate 4 and the enantiomers (R)- and (S)-4 showed a high in vitro metabolic stability in rat liver S9 fractions.

Graphical abstract: Convergent and enantioselective syntheses of cytosolic phospholipase A2α inhibiting N-(1-indazol-1-ylpropan-2-yl)carbamates

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Publication details

The article was received on 10 Mar 2014, accepted on 28 Apr 2014 and first published on 29 Apr 2014


Article type: Paper
DOI: 10.1039/C4OB00535J
Citation: Org. Biomol. Chem., 2014,12, 4021-4030
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    Convergent and enantioselective syntheses of cytosolic phospholipase A2α inhibiting N-(1-indazol-1-ylpropan-2-yl)carbamates

    T. Sundermann, M. Arnsmann, J. Schwarzkopf, W. Hanekamp and M. Lehr, Org. Biomol. Chem., 2014, 12, 4021
    DOI: 10.1039/C4OB00535J

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