In the crystal structure of the title compound, C(13)H(8)O(4), the inversely oriented mol-ecules form inversion dimers through pairs of O-H⋯O hydrogen-bonding inter-actions. An intramolecular O-H⋯O hydrogen bond occurs. In the packing of the mol-ecules, the nearly planar 2-(furan-2-yl)-4H-chromene units [dihedral angle between the chromene and furan rings = 3.8 (1)°] are either parallel or incl...

Crystals of the title compound, C(7)H(7)NO(3), under Mo Kα radiation sublime in less than 1h at room temperature. However, it was possible to collect data at 100K. It crystallized as the E isomer only. A double-bond conjugation in the furan ring is extended to the nitro-alkenyl group. Mol-ecular associations were realized in the crystal through N⋯π [3.545 (2) Å] inter-actions involving the fura...

The title compound, C(34)H(54)Br(2)N(2)O(6), was obtained by the Michael addition-elimination reaction of (5S)-5-(l-menthyl-oxy)-3,4-dibromo-furan-2(5H)-one with 1,6-hexa-nediamine in the presence of triethyl-amine. The crystal structure contains two chiral five-membered furan-one rings, in twist and envelope conformations, and two six-membered cyclo-hexane rings in chair conformations.

The title compound, C(17)H(26)ClNO(5), was prepared via a tandem asymmetric Michael addition-elimination reaction of (5S)-3,4-dichloro-5-(l-menth-yloxy)furan-2(5H)--one and l-alanine in the presence of potassium hydroxide. The five-membered furan-one ring is approximately planar while the six-membered menth-yloxy ring adopts a chair conformation. The crystal packing is stabilized by inter-molec...

In the title compound, C19H16F3NO6, a quinoline derivative featuring an annealated furan substituent, the mean planes of the carb-oxy substituents are at an angle of 74.3 (2)°. In the crystal, C-H⋯O contacts result in undulating chains along [110]. C-H⋯F contacts also occur. The shortest centroid-centroid distance between rings is 3.3376 (7) Å, involving two furan rings of neighbouring mol-ecules.

The title compound, C(8)H(10)ClNO(5), was obtained via a tandem Michael addition-elimination reaction of 3,4-dichloro-5-meth-oxy-furan-2(5H)-one and glycine methyl ester in the presence of triethyl-amine. The mol-ecular structure contains an approximately planar [maximum atomic deviation = 0.010 (2) Å] five-membered furan-one ring. The crystal packing is stabilized by inter-molecular N-H⋯O and ...

In the title compound, C20H16O3S, the dihedral angle between the mean planes of the naphtho-furan and 3-methyl-phenyl fragments is 88.56 (2)°. In the crystal, mol-ecules are linked via pairs of C-H⋯O hydrogen bonds, forming inversion dimers. These dimers are linked by π-π inter-actions between the furan rings of neighbouring mol-ecules [centroid-centroid distance = 3.701 (2) Å] into supra-molec...

The title compound, C(21)H(22)O(5), was prepared by NaOH-catalysed cyclo-condensation of 3-(4-ethoxy-phen-yl)-1-(furan-2-yl)prop-2-en-1-one with ethyl acetoacetate. In the crystal, C-H⋯O and C-H⋯π inter-actions link the mol-ecules. In the title mol-ecule, the furan and cyclo-hexene rings are almost parallel [6.77 (11)°] and the cyclo-hexene ring is approximately perpendicular to the benzene rin...

In the title compound, C(24)H(15)FO(2)S, the 4-fluoro-phenyl ring makes a dihedral angle of 19.43 (4)° with the mean plane of the naphtho-furan fragment. The dihedral angle between the phenyl ring and the mean plane of the naphtho-furan fragment is 85.83 (4)°. In the crystal, mol-ecules are linked by weak inter-molecular C-H⋯O hydrogen bonds.

The title compound, C(20)H(32)ClNO(3), was obtained via a tandem asymmetric Michael addition-elimination reaction of (5S)-3,4-dichloro-5-(l-menth-yloxy)furan-2(5H)-one and 4-methyl-piperidine in the presence of potassium fluoride. The furan-one ring is approximately planar [maximum atomic deviation = 0.022 (2) Å] while the cyclo-hexane ring adopts a chair conformation. Weak inter-molecular C-H⋯...