4-Hydroxy-3-[(2E)-3-(3,4,5-trimethoxyphenyl)prop-2-enoyl]-2H-chromen-2-one

Abstract

A new chalcone of the coumarin, C21H18O7, containing an annulated α-pyrone ring, was obtained by condensation of the borate complex of ac­yl(hydr­oxy)coumarin with trimethoxy­benzaldehyde. The structure exhibits intra­molecular hydrogen bonding between the hydroxyl oxygen and the ketonic oxygen in the coumarin group. The bicyclic coumarin fragment and the benzene ring form a dihedral angle of 17.1 (4)°. The crystal packing involves dimers inter­connected by C—H⋯O hydrogen bonding.

Expedious synthesis for α, β-unsaturated coumarin derivatives using boran chelates: A novel class of potential antibacterial and antioxidant agents

“…A more accurate description of the structure was presented in [33] but it is important to point out that along the connection between the coumarin Scheme 1. Synthesis of 3-acetyl-4-difluoro boryloxycoumarine.…”

Synthesis, characterization, spectroscopic and crystallographic investigation of Cobalt(III) schiff base complex with two perpendicular diamine coumarin ligands

“…In continuation of our previous research [25][26][27] on synthesis and characterization of new asymmetric Schiff base complex, we describe here the synthesis and characterization of the tridentate Schiff base (E)-3-(1-(2-aminoethylimino)ethyl)-4-hydroxy-2H-chromen-2-one (1), then its complexation reaction with cobalt(III) to obtain the complex numbered as (2).…”

4-Hydroxy-3-[(E)-3-phenylprop-2-enoyl]-2H-chromen-2-one

“…For related structures, see: Traven et al (2000); Sun & Cui (2008); Mechi et al (2009); Hamdi et al (2010); Asad et al (2010). For the synthesis of coumarin chalcones, see: Claisen & Claparede (1881).…”