Abstract

A rapid, green and efficient method for the synthesis of 1,8-dioxooctahydroxanthene and 3,3-arylidenebis(4-hydroxycoumarin) derivatives
through a one-pot condensation from various aromatic aldehydes is described using manganese ferrite (MnFe2O4) and cobalt ferrite
(CoFe2O4) as promoting material under solvent-free conditions which can easily be recovered and reused. Compared with other synthetic
methods, this new method has advantages such as milder reaction conditions, good to excellent yields, short reaction times, and
environmentally benign procedure.

Key words: Solvent-free reaction; 1,8-dioxooctahydroxanthene; 3,3-arylindene bis (4-hydroxycoumarin) derivatives ; reusable promoting material