Co-catalyzed [2+2+2] cycloaddition of two alkynes to one nitrile. They exhibit two nitrogen-containing rings fused in an angular fashion to one pyridine unit. Several relative positions of the nitrogen atoms have been studied, giving rise to eight different new scaffolds. In order to allow selective functionalization of the two amino groups, orthogonalprotectinggroups (PG' and PG 2 ) were introduced prior
Heterocyclic compounds of Formula (I) shown herein. Also disclosed is a pharmaceutical composition containing one of the heterocyclic compounds. Further disclosed are methods of using one of the heterocyclic compounds for mobilizing hematopoietic stem cells and endothelial progenitor cells into the peripheral circulation, and for treating tissue injury, cancer, inflammatory disease, and autoimmune disease.