Tandem catalysis: from alkynoic acids and aryl iodides to 1,2,3-triazoles in one pot.

A tandem catalysis protocol based on decarboxylative coupling of alkynoic acids and 1,3-dipolar cycloaddition of azides enables a highly efficient synthesis of a variety of functionalized 1,2,3-triazoles. The three-step, one-pot method avoids usage of gaseous or highly volatile terminal alkynes, reduces handling of potentially unstable and explosive azides to a minimum, and furnishes target structures in excellent yields and a very good purity without the need for additional purification.