330206-41-2Relevant articles and documents
Poly (ethylene glycol)-bound sulphonic acid as a novel catalyst for synthesis of benzoxazoles
Chikhale, Rupesh V.,Pant, Amit M.,Menghani, Sunil S.,Wadibhasme, Pankaj G.,Khedekar, Pramod B.
, p. 254 - 262 (2013/12/04)
ABSTRACT Ahighly efficient, simple and rapid method for the preparation of various 2-aminobenzoxazoles and other benzoxazole derivatives using a catalytic amount of poly (ethylene glycol)-bound sulphonic acid (PEG-SO3H) is described. PEG-SO3H is found to be economical and reusable catalyst with low catalytic loading. The percentage yield was found to be satisfactory, experimental set-up and purification of final products is facile and easy. GRAPHICAL ABSTRACT.
Extending the scope of chromium - Manganese redox-coupled reactions: A one-pot synthesis of benzoxazoles
Hari,Karan,Rodrigues,Miller
, p. 991 - 996 (2007/10/03)
A critically important strategy for synthetic chemistry is the development of domino processes: those capable of concatenating multiple transformations into a single step. Such transformations not only provide an increase in synthetic efficiency, but also imply the development of a significant degree of mechanistic understanding. We report herein a new domino reaction, in which a chromium-manganese redox couple is employed both to catalytically reduce an o-hydroxy nitroarene and to oxidatively cyclize a subsequently formed imine. We find that the reaction is most effective for starting o-hydroxy nitroarenes with a strongly electron-withdrawing group at the para position.
