Molecular oxygen (O 2 ) was successfully employed as a reoxidant in cyclizations of thiobenz-A C H T U N G T R E N N U N G anilides 1a-s through a palladium-catalyzed C À H functionalization/intramolecular C À S bond formation process, leading to an efficient, green method for the synthesis of 2-arylbenzothiazoles 2a-s. Addition of cesium fluoride (CsF) greatly enhanced the reactions, which produced variously substituted 2-arylbenzothiazoles with good functional group tolerance. Thioureas 4a-j were also found to be suitable substrates for the cyclization process using a palladium/ O 2 catalyst system, thus generating 2-aminobenzothiazoles 5a-j. One-pot syntheses of 2-aminobenzothiazoles 5a-j from aryl isothiocyanates 6 and amines 7 were also successful.