Highly efficacious preparation of 3,3 '-(arylmethylene)-bis(2-hydroxynaphthoquinone) derivatives catalyzed by a nanorod-structured organic-inorganic hybrid material

摘要

A nanorod-structured organic-inorganic hybrid material namely nanorod-[SiO2-Pr-Im-SO3H][CF3CO2] (N-[SPIS][TFA]) has been applied as a highly efficacious, dual-functional, and recoverable catalyst for the solvent-free preparation of 3,3'-(arylmethylene)-bis(2-hydroxynaphthoquinone) {3,3 '-(arylmethylene)-bis(2-hydroxynaphthalene-1,4-dione)} derivatives in high yields and relatively short times. The one-pot pseudo-multi-component reaction of 2-hydroxynaphthoquinone (2-hydroxynaphthalene-1,4-dione) (2 eq.) and arylaldehydes (1 eq.) has been used for the preparation of these compounds.