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A simple preparation of ethyl 2,5‐dimethylfuran‐3‐carboxylate (3), 2,5‐dimethylfuran‐3,4‐dicarboxylic acid (4), and diethyl 2,5‐dimethylfuran‐3,4‐dicarboxylate (5) by treatment of diethyl 2,3‐diacetylsuccinate (2) with aqueous HCl is reported. The reaction is performed under organic solvent free conditions from a readily available cheap starting material. J. Heterocyclic Chem., (2009).

Liquid. -A wide range of 1,4-diketones easily undergoes condensation with aniline or ethylenediamine furnishing pyrroles using [bmim]HSO4 as catalyst and reaction medium.

The mol­ecular skeleton of the title mol­ecule, C16H11NO3, is nearly planar with the two aromatic rings forming a dihedral angle of 2.73 (7)°. In the crystal, weak inter­molecular C—H⋯O hydrogen bonds link mol­ecules into ribbons extended along [101]. The crystal packing exhibits also π–π inter­actions, as indicated by the short centroid–centroid distances between the aromatic rings [3.681 (3) Å] and between the aromatic and furan rings [3.811 (3) Å] of neighbouring mol­ecules.

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