Citric Acid → 2-[(3R,5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-1-[(2S)-1-(methanesulfonamido)butan-2-yl]-3-methyl-2-oxopiperidin-3-yl]acetic acid

Participants

Reaction Steps

To a rapidly stirring solution of N—((S)-2-((3S,5R,6S)-3-allyl-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-methyl-2-oxopiperidin-1-yl)butyl)methanesulfonamide (34 mg, 0.064 mmol; Example 91, Step C) in a mixture of water (0.55 mL), acetonitrile (0.37 mL), and CCl4 (0.37 mL) was added sodium periodate (55 mg, 0.26 mmol) and ruthenium(III) chloride hydrate (1.5 mg, 6.5 μmol). After being stirred vigorously for 20 h, the reaction was acidified (10% citric acid) and diluted with EtOAc. The insoluble material was removed by filtering through a pad of Celite® (J.T. Baker, Phillipsberg, N.J., diatomaceous earth). The filtrate was extracted (2×EtOAc) and washed (sat. aq. NaCl solution). The combined organic layers were dried (Na2SO4) and concentrated under reduced pressure. Purification by RP-HPLC (40 to 70% MeCN/H2O (0.1% TFA), a gradient elution) provided the title compound as a white foam.

Provenance & Evidence