Solvent‐Free Synthesis of 2‐Aryl and 2‐Alkylbenzothiazoles on Silica Gel Under Microwave Irradiation

Mitsuo Kodomaria*, Yoshimi Tamarua & Tadashi Aoyamab a Department of Applied Chemistry , Shibaura Institute of Technology , Shibaura, Minato‐ku, Tokyo, 108‐8548, Japan b Department of Materials and Applied Chemistry, Faculty of Science and Engineering , Nihon University , Chiyoda‐ku, Tokyo, Japan * kodomari@sic.shibaura-it.ac.jp Abstract 2‐Substituted benzothiazoles have been synthesized by the condensation of o‐aminothiophenol and aromatic or aliphatic aldehydes in the presence of silica gel under microwave irradiation (MW) and solvent‐free conditions. The silica gel can be easily recovered and reused for subsequent reactions without loss of the activity.