Three-component chemoenzymatic synthesis of amide ligated 1,2,3-triazoles

CAL-B (Candida antarctica lipase B) immobilized on an acrylic resin (Novozyme® 435) smoothly catalyzes the aminolysis of methyl esters with propargyl amine furnishing propargyl amides. In the same reaction vessel these propargyl derivatives are consecutively transformed into amide ligated 1,2,3-triazoles in a Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) click reaction in good to excellent yields.