Synthesis of 7-aryl/heteraryl-1,3-diphenyl-1,2,4-benzotriazinyls via palladium catalyzed Stille and Suzuki-Miyaura reactions

Stille and Suzuki-Miyaura reactions of 7-iodo-1,3-diphenyl-1,4-dihydro-1,2,4-benzotriazin-4-yl are presented as rare examples of cross-coupling reactions with stable organic radicals. Both the Stille and Suzuki-Miyaura reactions are in most cases high yielding but the latter are cleaner while the former are faster and are accompanied by 1,3-diphenyl-1,2,4-benzotriazin-7(H)-one as by-product. A range of 7-aryl and 7-heteroaryl-1,2,4-benzotriazinyls have been synthesized and characterized using standard spectroscopic and spectrometric means.