Phthalimide → HCID 59954332, compound

Participants

Reaction Steps

To a solution of (2R,3aS)-2-hydroxy-5-[4-[(2-phenylbenzoyl)amino]benzoyl]-1,2,3,3a,4,5-hexahydro-pyrrolo[1,2-a]quinoxaline (1.2 g) prepared in Example 3, phthalimide (0.54 g) and triphenyl phosphine (0.96 g) in anhydrous N,N-dimethylformamide (10 ml), there was gradually dropwise added, under ice-cooling, a solution of diisopropyl azodicarboxylate (0.74 g) in anhydrous N,N-dimethylformamide (4 ml). After stirring the reaction solution at room temperature for 2 hours, it was poured into ice water and then extracted with ethyl acetate. The resulting organic phase was washed with water, dried over anhydrous magnesium sulfate and then concentrated. The resulting residue was subjected to silica gel column chromatography and then eluted with hexane/ethyl acetate (1/1) to give 1.1 g (yield 73.0%) of the title compound as amorphous powder.

Provenance & Evidence