Water → 2-((3R,5R,6S)-5-(3-Chlorophenyl)-6-(4-chlorophenyl)-1-((1S,2S,3R)-2,3-dihydroxycyclopentyl)-3-methyl-2-oxopiperidin-3-yl)acetic acid

Participants

Reaction Steps

To a solution of 2-((3R,5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-1-(cyclopent-2-enyl)-3-methyl-2-oxopiperidin-3-yl)acetic acid (Example 102, Step F) (94 mg, 0.205 mmol) in THF (1.0 mL) was added water (0.25 mL) and tBuOH (0.2 mL) at room temperature. NMO (36.0 mg, 0.308 mmol) was added followed by osmium tetroxide (4% aq) (1.303 μL, 0.205 mmol). The reaction mixture was stirred at room temperature for 24 h. Water (10 mL) was added and the mixture was extracted with DCM twice. The organic layers were combined and dried over Na2SO4 and concentrated under reduced pressure. The residue, containing a mixture of three stereoisomers, was purified by reversed phase preparatory HPLC (column: Gemini-NX C18 5 um column; Phenomonex, Torrance, Calif.; eluent: 30 to 50% MeCN+0.1% TFA in water+0.1% TFA, over 20 minutes) to provide the title compound as the first eluting isomer.

Provenance & Evidence