Beta-Alanine → 3-Phthalimidopropionic acid

Participants

Reaction Conditions

Reaction Steps

Into a 3-L 4-necked round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed a solution of 3-aminopropanoic acid (20 g, 224.48 mmol, 1.00 equiv) and 1,3-dihydro-2-benzofuran-1,3-dione (33.28 g, 224.69 mmol, 1.00 equiv) in acetic acid (1,200 mL). This was followed by the addition of potassium acetate (66.0 g, 672.49 mmol, 3.00 equiv) in several batches at 0° C. The resulting solution was stirred for 3 h at 80° C. in an oil bath. The resulting mixture was concentrated under vacuum. The reaction was then quenched by the addition of 150 mL of water. The solids were collected by filtration. This resulted in 40 g (81%) of 3-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl)propanoic acid as a white solid. Rf: 0.15 (in ethyl acetate:petroleum ether=1:1).

Provenance & Evidence