A highly efficient and green approach for the synthesis of pyrimido[4,5-<i>b</i>]quinolines using <i>N,N</i>-diethyl-<i>N</i>-sulfoethanaminium chloride
Abdolkarim Zare, Manije Dianat
Abstract
Abstract A highly efficient and green protocol for the synthesis of pyrimido[4,5- b ]quinolines has been described. The one-pot multicomponent reaction of dimedone with arylaldehydes and 6-amino-1,3-dimethyluracil in the presence of N,N- diethyl- N -sulfoethanaminium chloride ([Et 3 N–SO 3 H][Cl]) as an ionic liquid (IL) catalyst under solvent-free conditions afforded the mentioned compounds in high yields and short reaction times. Our protocol is superior to many of the reported protocols in terms of two or more of these factors: the reaction times, yields, conditions (solvent-free versus usage of organic solvents), temperature and catalyst amount.
Topics & Concepts
DimedoneChemistryCatalysisIonic liquidSolventChlorideReaction conditionsMedicinal chemistryGreen chemistryOrganic chemistryCombinatorial chemistryMulticomponent Synthesis of HeterocyclesSynthesis and Biological EvaluationSynthesis and biological activity