Amine based ionic liquid was reported as an efficient and easily recyclable catalyst for the solvent free environmental benign synthesis of xanthene and benzoxanthene derivatives within 10–30 minutes.
Three-component cyclocondensation of β-naphthol, aldehydes, and 5,5-dimethylcyclohexane-1,3-dione (dimedone) was catalyzed efficiently by ruthenium chloride hydrate under mild reaction conditions to afford 12-aryl or alkyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one derivatives in good to excellent yields.