A Novel Synthetic Compound (E)-5-((4-oxo-4H-chromen-3-yl)methyleneamino)-1-phenyl-1H-pyrazole-4-carbonitrile Inhibits TNFα-Induced MMP9 Expression via EGR-1 Downregulation in MDA-MB-231 Human Breast Cancer Cells

(E)-3-(1,3-Diphenyl-1H-pyrazol-4-yl)-1-(thia-zol-2-yl)prop-2-en-1-one

In the title mol-ecule, C21H15N3OS, the C5=C6 double bond in the central enone group adopts a trans configuration. The dihedral angle between planes of the thia-zole and pyrazole rings is 6.6 (2)°. In the crystal, pairs of C-H⋯O hydrogen bonds generate inversion dimers and another pair of C-H⋯N hydrogen bonds link the dimers into chains propagating along a-axis direction.

Total Synthesis of Lineaflavones A, C, D, and Analogues

The first total synthesis of lineaflavones A, C, D, and their analogues has been accomplished. The key synthetic steps include aldol/oxa-Michael/dehydration sequence reactions to assemble the tricyclic core, Claisen rearrangement and Schenck ene reaction to construct the key intermediate, and selective substitution or elimination of tertiary allylic alcohol to obtain natural compounds. In addition, we also explored five new routes to synthesize fifty-three natural product analogues, which can contribute to a systematic structure-activity relationship during biological evaluation.

Crystal structure of (E)-ethyl 2-((4-oxo-4H-chromen-3-yl)methyleneaminooxy)acetate, C14H13NO5

C14H13NO5, monoclinic, P21 (no. 4), a = 4.6967(7) Å, b = 10.7175(16) Å, c = 12.945(2) Å, β = 94.827(8)°, V = 649.30(17) Å3, Z = 2, R gt (F) = 0.0577, wR ref (F 2) = 0.1302, T = 223(2) K.

Crystal structure of (E)-3-(dimethylamino)-1-(thiophen-3-yl)prop-2-en-1-one, C9H11NOS

C9H11NOS, monoclinic, P21/n (no. 14), a = 6.0194(4) Å, b = 20.9249(13) Å, c = 7.7103(5) Å, β = 107.783(2)°, V = 924.75(10) Å3, Z = 4, R gt (F) = 0.0373, wR ref (F 2) = 0.1061, T = 223(2) K.