Phthalimide → tert-Butyl alpha-[2-(1,3-Dihydro-1,3-dioxo-2H-isoindol-2-yl)ethyl]-3-(2-methylpropyl)-2-oxo-1-(2-phenylethyl)-3-pyrrolidineacetate

Participants

Reaction Steps

Diethyl azodicarboxylate (182 uL, 1.16 mmol) is added to a mixture of tert-butyl α-(2-hydroxyethyl)-3-(2-methylpropyl)-2-oxo-1-(2-phenylethyl)-3-pyrrolidineacetate (468 mg, 1.16 mmol), triphenylphosphine (304 mg, 1.16 mmol), phthalimide (171 mg, 1.16 mmol) and THF (10 mL) at room temperature. The mixture is allowed to stir overnight and is concentrated. Purification by column chromatography (2 columns, 5% acetone/CH2Cl2 and 10% EtOAc/hexane) provided 327 mg (51%) of the title compound as a colorless oil.

Provenance & Evidence