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In this paper, a novel synthesis of diversely substituted 2 H-pyran-2-ones via the tandem reaction of 3-hydroxyhexa-4,5-allenic esters in water under the promotion of MWI has been developed. Compared with those reactions carried out in organic solvents, water mediated synthesis of poly-substituted 2 H-pyran-2-ones is not only environmentally sustainable, but also chemo-selectively favorable. [ABSTRACT FROM AUTHOR]

In the title compound, C13H10O3, the pyran-one and benzene rings are almost coplanar, making a dihedral angle of 1.9 (1)°. The cyclo-hexenone ring adopts an envelope conformation, with a methyl-ene C atom located at the flap and displaced by 0.639 (3) Å from the mean plane of the other five atoms. In the crystal, pairs of weak C-H⋯π inter-actions occur between inversion-related mol-ecules.

In the crystal structure of the title compound, C(8)H(6)N(2)O(3), the mol-ecules are linked by a pairs of inter-molecular N-H⋯O hydrogen bonds, forming inversion dimers. The aldehyde group is in the same plane as the pyrimidine ring [with a maximum deviation of 0.083 (2) Å for the O atom), and the linear propargyl group [C-C-C = 178.99 (19)°] makes a dihedral angle of 74.36 (13)° with the ring.