Fast, Acid-Free, and Selective Lactamization of Lactones in Ionic Liquids
摘要:
A fast and acid-free one-pot 0.2-30 mmol microwave methodology for direct ionic liquid-mediated preparation of lactams from lactones and primary amines has been developed. The protocol was investigated with a wide range of primary amines and a handful of lactones, including substrates with acid-sensitive substituents. Both gamma-lactams and delta-lactams were, despite the complete absence of a Bronsted acid. obtained in useful to excellent yields after only 35 min of microwave processing.
Fast, Acid-Free, and Selective Lactamization of Lactones in Ionic Liquids
作者:Kristina M. Orrling、Xiongyu Wu、Francesco Russo、Mats Larhed
DOI:10.1021/jo8015264
日期:2008.11.7
A fast and acid-free one-pot 0.2-30 mmol microwave methodology for direct ionic liquid-mediated preparation of lactams from lactones and primary amines has been developed. The protocol was investigated with a wide range of primary amines and a handful of lactones, including substrates with acid-sensitive substituents. Both gamma-lactams and delta-lactams were, despite the complete absence of a Bronsted acid. obtained in useful to excellent yields after only 35 min of microwave processing.