48. Organophosphorus-mediated N–N bond formation: facile access to 3-amino-2H-indazoles
H. B. Abed, J. Schoene, M. Christmann, M. Nazaré
A convenient and efficient strategy has been devised to access 3-amino-2H-indazole derivatives in two steps from readily available starting materials. The conversion of 2-nitrobenzonitriles to substituted benzamidines followed by an organophosphorus-mediated reductive cyclization and a subsequent N–N bond formation afforded 3-amino-2H-indazoles in good to excellent yields.