A copper-based catalytic system has been developed to enable formal [3 + 1 + 2] annulations of ketoxime acetates, aldehydes, and cyanamides. This protocol offers a new strategy for the synthesis of highly substituted 2-aminopyrimidine compounds, and more importantly, pyrimidines have now been included in the N-heterocycle family constructed using O-acyl ketoximes as N–C–C synthons.
Eco-safe and expeditious approaches for synthesis of quinazoline and pyrimidine-2-amine derivatives using ionic liquids aided with ultrasound or microwave irradiation
作者:Masoumeh Zakeri、Mohamed M. Nasef、Ebrahim Abouzari-Lotf
DOI:10.1016/j.molliq.2014.09.018
日期:2014.11
Green approaches for efficientsynthesis of quinazoline- and pyrimidine-2-amine derivatives were established based on the one-pot and three-component condensation of guanidine carbonate, cyclic ketones and aldehydes. These approaches involve the evaluation of the activity of several acidic ionicliquids (ILs) as organocatalysts under solvent-free medium in the microwave and as solvents and catalysts