DBU, A Highly Efficient Reagent for the Facile Regeneration of (Hetero) Arylamines from their Acetamides and Benzamides: Influence of Solvent, Temperature, and Microwave Irradiation

摘要

1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) was found to smoothly cleave the N-acetyl and N-benzoyl derivatives of carbazoles, indoles and nitroanilines quickly in refluxing methanol and the parent amines were recovered in excelent yields. Complete cleavage could also be accomplished in acetonitrile solution under reflux and also under microwave irradiation, which, however, required considerably longer periods.