3,3'-[(4-Nitro-phen-yl)methyl-ene]bis-(4-hy-droxy-2H-chromen-2-one)

Synthesis of unexpected novel bis-coumarin derivatives three component reactions of 4-hydroxycoumarin, aldehydes and cyclic secondary amines. Conformation in the solid state and pharmacological evaluation

A series of unexpected bis-coumarins have been synthesized by multicomponent reactions of 4-hydroxycoumarin, aldehydes, and cyclic secondary amines in ethanol at room temperature. The chemical structures of new compounds were identified by 1H, 13C NMR, and mass spectrometry. Furthermore, the molecular structure of the solid-state adduct of 3,3′-[(4-methoxyphenyl)-methylene]bis(4-hydroxy-2H-chromen-2-one) with morpholine (1:1) has been confirmed by single-crystal X-ray diffraction. The cytotoxicity of the new coumarin derivatives against MCF7 breast cancer cells was evaluated. A docking study of the new products was carried out to assess the molecular affinity between the tested compound and Topoisomerase IIa.

2,2'-[(3-Bromo-4-hy-droxy-5-meth-oxy-phen-yl)methyl-idene]bis-(3-hy-droxy-5,5-dimethyl-cyclo-hex-2-en-1-one)

In the title compound, C(24)H(29)BrO(6), the dihedral angle between the cyclo-hexenone mean planes is 57.63 (2)° while the dihedral angles between the benzene ring and the cyclo-hexenone mean planes are 58.42 (2) and 69.08 (3)°. The two cyclo-hexenone rings both show an envelope conformation, with the C atom bearing two methyl groups as the flap atom in each ring. Two intra-molecular O-H⋯O hydrogen bonds occur. In the crystal, molecules are linked via pairs of O-H⋯O hydrogen bonds, forming inversion dimers.

2,2'-[(4-Eth-oxy-phen-yl)methyl-ene]bis-(3-hy-droxy-5,5-dimethyl-cyclo-hex-2-en-1-one)

In the title compound, C(25)H(32)O(5), the two cyclo-hexenone rings have envelope conformations with the C atom bearing two methyl groups as the flap atom in each ring. Relatively strong intra-molecular O-H⋯O hydrogen bonds are observed.