Ethyl 4-(2-furyl)-2-oxochroman-3-carboxylate

The title compound, C16H14O5, was prepared from the reaction of 3-carbethoxycoumarin with furan in the presence of AlCl3 as catalyst. In the crystal, intermolecular C—H...O hydrogen-bonding interactions between four molecules lead to a tetramer in the unit cell. The furan ring is antiperiplanar [C—C—C—O = 167.9 (13)°] and the ethoxycarbonyl group is (−)anticlinal [C—C—C—O = −128.6 (14)°] to the lactone ring.