Cyclopentylamine → 2-Cyclopentyl-5-hydroxyisoindoline-1,3-dione

Participants

Reaction Steps

4-Hydroxy-phthalic anhydride (5.4 g, 32.9 mmol), cyclopentyl amine (4.9 mL, 49.6 mmol) and 4 Å molecular sieves in toluene (136 mL) were stirred at reflux overnight. The reaction mixture was filtered and the solvent was evaporated in vacuo to obtain the product (6.1 g, 80%) as a yellow solid. 1H NMR (300 MHz, DMSO-d6): δ 7.60 (d, J=7.8 Hz, 1H), 7.05-7.01 (m, 2H), 4.50-4.40 (m, 1H), 1.97-1.52 (m, 8H).

Provenance & Evidence