1, 3-Dipolar cycloaddition has proved to be an effective synthetic tool, providing one of the best ways to construct five-membered heterocyclic compounds with diverse functionality [1]. In most cases, the reaction proceeds with controlled stereospecifity and regioselectivity with respect to the dipolarophiles. Apart from the common alkenes and alkynes, numerous heteroatom-containing unsaturated compounds have been developed and applied ...
