A novel and efficient four-component synthesis of chromen–based dithiocarbamate derivatives by homogeneous catalysts under solvent-free conditions

An efficient and one-pot procedure is described for the synthesis of a variety derivatives 1,2-dihydrobenzo[f]chromen-3-ones 3,4-dihydrochromen-2-ones under solvent-free conditions via pseudo-four-component domino reaction acetic anhydride, aryl aldehydes, glycine-based dithiocarbamates, phenols/naphthols in presence l-proline H4[Si(W3O10)4].xH2O as green catalysts. All products were made strategy corresponding with excellent yields (up to 94%) diastereoselectivity.