Succinic anhydride → 4-oxo-4-(1-phenyl-3,4-dihydropyrrolo[1,2-a]pyrazin-2(1H)-yl)butanoic acid

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Reaction Steps

1-Phenyl-1,2,3,4-tetrahydropyrrolo[1,2-a]pyrazine (A2) (396 mg, 2.0 mmol) and NEt3 (277 μl, 2.0 mmol) were added to a suspension of succinic anhydride (176 mg, 1.76 mmol) in MeCN (28 ml), and stirring was carried out for 16 h at RT. The mixture was then diluted with EA (30 ml) and washed with 2N hydrochloric acid (2×5 ml). The organic phase was dried over MgSO4, filtered and concentrated in vacuo. The resulting residue was taken up in EA (50 ml) and again washed with 2N hydrochloric acid (20 ml) and then with a sat. aq. sodium carbonate solution (2×30 ml). The organic phase was again dried over MgSO4, filtered and concentrated in vacuo. CC (EA/MeOH 3:1) with the residue yielded 230 mg (0.77 mmol, 44%) of 4-oxo-4-(1-phenyl-3,4-dihydro-pyrrolo[1,2-a]pyrazin-2(1H)-yl)butanoic acid (S3).

Provenance & Evidence