Resolution of 4-cyano-4-(4-nitrophenyl)hexanoic acid: Synthesis of (R) and (S)-3-(4-aminophenyl)-3-ethylpiperidine-2,6-dione (aminoglutethimide1)

Add time:07/19/2019    Source:sciencedirect.com

Using (R)- or (S)-1-phenylethylamine as a resolving agent, (R)- and (S)-4-cyano-4-(4-nitrophenyl)hexanoic acids have been isolated. Cyclization of each enantiomer, followed by reduction of the nitro group, afforded (R)- and (S)-aminoglutethimide of high (>99% ee) enantiomeric purity, respectively. The absolute configuration of (R)-(+)-3-(4-nitrophenyl)-3-ethylpiperidine-2,6-dione was solved by X-ray single crystal analysis thus establishing the (R)-configuration of the dextrorotatory aminoglutethimide. Attempted resolution of the other precursor of aminoglutethimide, 4-cyano-2-ethyl-(4-nitrophenyl)butanoic acid with (S)-1-phenylethylamine led to the formation of the double salt. Its crystal structure was elucidated by X-ray crystallographic analysis.

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