Sodium Carbonate → HCID 58714545, compound

Participants

Reaction Steps

4-{[(2S,4EZ)-2-(5-{(1S)-2-tert-butoxy-1-[(tert-butoxycarbonyl)amino]ethyl}-1,2,4-oxadiazol-3-yl)-4-(methoxyimino)pyrrolidinyl]carbonyl}-1,1′-biphenyl (100 mg, 1.80 mmol) was treated with a 25% TFA/DCM solution at 0° C. for 1 hour. The reaction was then made basic with a sodium carbonate solution (10%) and extracted with DCM. The organic phases were combined and dried over magnesium sulfate and solvent removal afforded two products, which were separated and purified by flash-chromatography to give the desired products as mixtures of E-/Z-isomers, (3EZ,5S)-5-{5-[(1S)-1-amino-2-tert-butoxyethyl]-1,2,4-oxadiazol-3-yl}-1-([1,1′-biphenyl]-4-ylcarbonyl-3-pyrrolidinone O-methyloxime in 20% yield (80.8% purity by HPLC), and (3EZ,5S)-5-{5-[(1S)-1-amino-2-hydroxyethyl]-1,2,4-oxadiazol-3-yl}-1-([1,1′-biphenyl]-4-ylcarbonyl)-3-pyrrolidinone O-methyloxime in 30% yield (98.1% purity by HPLC).

Provenance & Evidence