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A new family of chiral glycodendrimers scaffolds containing di-, tetra-and octavalent glucose residues as peripheral unit and with 1,2,3-triazole as building unit has been synthesized through Cu(I)-catalyzed click chemistry by convergent approach.

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New dienone core based Fr échet type dendrimers with a fluorophoric benzothiazole surface unit have been synthesized successfully in good yields by a convergent approach and their photophysical and electrochemical properties are found to depend on dendrimer generation. The intensity of absorption and emission increases as the generation of dendrimer increases.

In the title compound, C16H10Cl2N4O4, the pyrazine rings make dihedral angles of 67.82 (9) and 75.91 (9)° with the benzene ring, while the dihedral angle between the pyrazine rings is 44.69 (10)°. The meth­oxy­carbonyl group makes a dihedral angle of 16.82 (8)° with the benzene ring to which it is attached. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules, forming chains running along the ab plane.