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The Ce-ZSM-11 zeolite has been used as an efficient catalyst for the one pot synthesis of 1,8-dioxooctahydroxanthene derivatives from aromatic aldehyde and 5,5-dimethyl-cyclohexane-1,3-dione under reflux condition. The catalyst was characterized by Powder X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR), Brunauer-Emmer-Teller (BET) surface area analysis, and Temperature Programmed Desorption (TPD) techniques. This method provides several advantageous such as use of inexpensive catalyst, simple work-up procedure, high yield of desired product and reusability of catalyst.

Benzothiazoles are important heterocyclic compound because of their wide range of biological and pharmacological activity. In literature, it is reported that Benzothiazoles and its derivatives possess numerous pharmacological activities like antitumor, anticonvulsant, antimicrobial, antioxidant, antitubercular, antimalarial, antifungal, anti-inflammatory and antidiabetic activities. In recent year several methods have been developed for the synthesis of Benzothiazole derivatives due to their importance in bioorganic and medicinal chemistry. The present review focuses on systematic literature report of various synthetic procedures of Benzothiazoles derivatives using different strategies from the period 2010 to 2021.