Unprecedented SnCl2-Mediated Cyclization of Nitro Arenes via N−N Bond Formation
摘要:
A mild, efficient, one-pot protocol for the cyclization of nitro-aryl substrates using SnCl2 has been described. The mechanistic course of the reaction suggests the involvement of a hydroxylamine intermediate leading to an intramolecular cyclization via N-N bond formation. The versatility of the methodology has been demonstrated by using two nitro-aryl substrates derived from dihydroisoquinolines and dihydro-beta-carbolines. The intramolecular cyclization led to the formation of indazoles in high yields and purities.
Unprecedented SnCl2-Mediated Cyclization of Nitro Arenes via N−N Bond Formation
摘要:
A mild, efficient, one-pot protocol for the cyclization of nitro-aryl substrates using SnCl2 has been described. The mechanistic course of the reaction suggests the involvement of a hydroxylamine intermediate leading to an intramolecular cyclization via N-N bond formation. The versatility of the methodology has been demonstrated by using two nitro-aryl substrates derived from dihydroisoquinolines and dihydro-beta-carbolines. The intramolecular cyclization led to the formation of indazoles in high yields and purities.