Phthalimidine (2,3-dihydro-1H-isoindol-1-one) syntheses in recent years are reviewed primarily for those involving synthetic auxiliary-mediated mild Mannich type condensation reactions.
Application of the Mild-Condition Phthalimidine Synthesis with Use of 1,2,3-1H-Benzotriazole and 2-Mercaptoethanol as Dual Synthetic Auxiliaries. Effective Synthesis of Phthalimidines Possessing a Variety of Substituents at 2-Position
The mild-condition phthalimidine synthesis based on Mannich type 1:1 condensation reaction between o-phthalaldehyde with a variety of primary amines in the presence of excess 2-mercaptoethanol and 1,2,3-1H-benzotriazole as "dual synthetic auxiliaries" in MeCN for 13 h at room temperature afford 2-substituted phthalimidines (2,3-dihydroisoindol-1-one) in fair to good isolated yields.