silica-bonded n-propyltriethylene-tetramine (sbnptt) was found as an efficient solid base for the synthesis of 2-amino-5-oxo-5,6,7,8-tetrahydro-4h-chromenes. chromene derivatives were obtained via the three-component condensation reaction of aromatic aldehydes, malononitrile, and dimedone at 80 oc under solvent-free conditions. the heterogeneous solid base showed much the same efficiency when u...

Background and Aims: Benzopyrones are a group of compounds including coumarins and chromenes. Chromenes have a heterocyclic structure with gamma benzopyran which has anticancer activities. In this investigation we studied the effect of 4 new derivatives of chromene compounds on the human acute lymphoblastic leukemia cell line MOLT4. Materials and Methods: The structure of the new compound was ...

a series of 2-amino-4-(nitroalkyl)-4h-chromene-3-carbonitriles were synthesized by an efficient multicomponent reaction in aqueous media using dbu (1,8-diazabicyclo[5.4.0]undec-7-ene) as a catalyst at room temperature. mild condition, environment friendly procedure and excellent yields are the main advantages of this procedure. the cytotoxic activity of target compounds were evaluated against t...

A synergetic effect of nanocatalyst and ultrasonic irradiation was examined for the synthesis 4H-chromenes from benzaldehyde, cyclohexanone, malononitrile. It observed this contributory improved reaction that used highly pure products in short times highest yields. The nanocomposite includes guanidine anchored on to magnetic NiFe2O4 nanoparticles were as active base sonication compounds. produc...

For the first time, proton complexes of photoinduced colored form chromene have been obtained in polymer binders. It is shown that UV irradiation photochromic leads to spectral changes due structure compounds and nature binder. Keywords: photochromism, chromene, naphthopyran, matrix, spectroscopy.

Silica-bonded n-propyltriethylene-tetramine (SBNPTT) was found as an efficient solid base for the synthesis of 2-amino-5-oxo-5,6,7,8-tetrahydro-4H-chromenes. Chromene derivatives were obtained via the three-component condensation reaction of aromatic aldehydes, malononitrile, and dimedone at 80 oC under solvent-free conditions. The heterogeneous solid base showed much the same efficiency when u...