Microwave-Assisted Silver(I)-Mediated
Selective O-Alkylation of Aromatic Imidate Systems
作者:Erik Van der Eycken、Brajendra Singh、Claudia Cavalluzzo、Marc De
Maeyer、Zeger Debyser、Virinder Parmar
DOI:10.1055/s-0029-1216878
日期:——
A novel microwave-assisted protocol has been developed for the selective O-alkylation of aromatic imidate systems with various halides under microwave irradiation using silver carbonate as the base. Products were obtained in short reaction time and in excellent yields.
Mixing with equimolar solutions of pyridine N-oxide or its homologs and SbCl5 in CCl4 deposited 1:1 complexes as colorless crystals in high yield. On thermolysis, these complexes underwent intramolecular oxygen transfer to give selectively the corresponding 2-pyridone derivatives. N,N-Dimethylaniline N-oxide and SbCl5 also gave a crystalline 1:1 complex which on thermolysis yield o-dimethylaminophenol