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Starting from 3-propargylquinazolin-4(3H)-ones bearing a primary or secondary carboxamide group at position 2, an intramolecular alkyne hydroamination reaction, catalyzed by mercury(II) acetate, afforded 2H-pyrazino[2,1-b]quinazoline-1,6-diones in a two-step process that involves a rearrangement of the primary cyclization products. The title compounds represent a novel type of tricyclic heteroaromatic scaffolds.

An efficient access to novel 2H-pyrazino[2,1-b]quinazoline-1,6-diones via intramolecular alkyne hydroamination